WO2020174878A1 - Moteur électrique et soufflante électrique - Google Patents

Moteur électrique et soufflante électrique Download PDF

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Publication number
WO2020174878A1
WO2020174878A1 PCT/JP2020/000079 JP2020000079W WO2020174878A1 WO 2020174878 A1 WO2020174878 A1 WO 2020174878A1 JP 2020000079 W JP2020000079 W JP 2020000079W WO 2020174878 A1 WO2020174878 A1 WO 2020174878A1
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WO
WIPO (PCT)
Prior art keywords
shaft
electric motor
frame
bracket
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/000079
Other languages
English (en)
Japanese (ja)
Inventor
藤田　克敏
勇輝 吉岡
諄也 寄木
知子 従野
和雄 遠矢
圭策 中野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of WO2020174878A1 publication Critical patent/WO2020174878A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Definitions

  • the present disclosure relates to an electric motor and an electric blower.
  • Electric motors are used in various appliances such as household electrical appliances.
  • an electric motor is used for an electric blower mounted on an electric vacuum cleaner.
  • a DC electric blower using a DC electric motor (0 (3 motors) is used.
  • this type of DC electric blower is used.
  • the structure is such that most of the sucked air can be discharged to the rear as much as possible.
  • Fig. 15 is a cross-sectional view of a conventional electric blower 1 X.
  • the conventional electric blower shown in Fig. 15 In 1X the air sucked in by the rotating fan 3 does not pass through the inside of the frame 40, but passes through the air guide 4X from the outer periphery of the rotating fan 3X and is discharged to the outside.
  • the electric blower mounted on the rechargeable vacuum cleaner is required to be smaller and lighter along with the demand for smaller and lighter cleaner body. In this case, it is required to maintain the performance even if the electric blower is made smaller and lighter. In this case, in order to maintain the performance, it is conceivable to increase the rotation speed of the electric motor installed in the electric blower to increase the rotation speed. However, if the electric motor is rotated at a high speed, the temperature of the winding of the electric motor becomes high and the temperature inside the electric motor becomes high.
  • FIG. 16 is a cross-sectional view of another conventional electric blower 1.
  • the air blown by the rotary fan 3 passes through the inside of the frame 40, so the original blower performance (suction performance) of the electric blower is reduced. descend. Especially, when the air sucked in by the rotary fan 3 passes through the air guide 4 and goes from the bracket 50 into the frame 40, the ventilation area decreases. As a result, the ventilation performance will be reduced.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2016-299878 Summary of Invention
  • An object of the present disclosure is to provide an electric motor, an electric blower, and the like that can ensure both high performance and cooling of the electric motor. ⁇ 0 2020/174 878 3 (: 17 2020/000079
  • one aspect of an electric motor is: a housing having an opening, a first portion that protrudes, and a second portion that protrudes on the opposite side of the first portion.
  • a shaft that is a rotating shaft, a rotor that is arranged in the housing, and the shaft is fixed, a stator that is arranged in the housing and faces the rotor, and a bracket that covers the opening, Equipped with.
  • the bracket has an inner through hole that communicates with the first inner communication section that communicates with the inside of the housing, and an outer communication section that is located outside the inner through hole in the radial direction of the shaft and that communicates with the outside of the housing.
  • An outer through hole communicating therewith is provided.
  • An aspect of the electric blower according to the present disclosure includes the above electric motor, and a rotary fan attached to a shaft of the electric motor.
  • FIG. 1 is a perspective view of an electric blower according to an embodiment when viewed from above.
  • FIG. 2 is a perspective view of the electric blower according to the embodiment when viewed from below.
  • FIG. 3 is an exploded perspective view of the electric blower according to the embodiment.
  • FIG. 4 is a cross-sectional view of an electric blower according to an embodiment.
  • FIG. 5 is a cross-sectional view of the electric blower according to the embodiment.
  • FIG. 6 is a top view of the electric blower according to the embodiment with the fan case, the rotary fan, and the air guide removed.
  • FIG. 7 is a perspective view of a bracket in the electric blower according to the embodiment.
  • FIG. 8 is a perspective view of an air guide in the electric blower according to the embodiment.
  • FIG. 9 is a diagram showing the performance of the conventional electric blower shown in Fig. 16.
  • FIG. 10 is a diagram showing the performance of the electric blower according to the embodiment. ⁇ 2020/174878 4 ⁇ (: 170? 2020/000079
  • FIG. 11 is a perspective view of a frame used in an electric blower according to a modification.
  • FIG. 12 is a cross-sectional view of an electric blower according to a modification.
  • FIG. 13 is a perspective view of another bracket of the electric blower according to the modified example.
  • FIG. 14 is a perspective view of another bracket of the electric blower according to the modified example.
  • FIG. 15 is a cross-sectional view of a conventional electric blower.
  • Fig. 16 is a cross-sectional view of another conventional electric blower.
  • the X axis, the vertical axis, and the axis represent the three axes of the three-dimensional orthogonal coordinate system.
  • the X axis and the vertical axis are orthogonal to each other and both are orthogonal to the axis.
  • FIG. 1 is a perspective view of an electric blower 1 according to the embodiment when viewed from above.
  • FIG. 2 is a perspective view of the electric blower 1 when viewed from below.
  • FIG. 3 is an exploded perspective view of the electric blower 1.
  • Fig. 4 shows the electric blower 1 ⁇ 2020/174 878 5 (: 170? 2020/000079
  • FIG. FIG. 5 is a sectional view of the electric blower 1.
  • FIG. 6 is a top view of the electric blower 1 with the fan case 5, rotary fan 3 and air guide 4 removed.
  • Fig. 4 shows a cross section (XZ cross section) taken along a plane passing through the axis C of the shaft 13.
  • Figure 5 shows the cross section (XY cross section) of the shaft 13 taken along the plane normal to the center C of the shaft. In Figures 4 and 5, only the cross-section is shown. In Figure 4, the air flow is indicated by the bold arrows.
  • the electric blower 1 includes an electric motor 2 and a rotary fan 3 attached to a shaft 13 of the electric motor 2.
  • the electric motor 2 is a fan motor that rotates the rotary fan 3.
  • the electric motor 2 includes a rotor 10, a stator 20, a yoke 30, a frame 40, and a bracket 50.
  • the rotor 10, the stator 20 and the yoke 30 are arranged in the frame 40.
  • the bracket 50 covers the opening 40 a of the frame 40.
  • the electric motor 2 is a commutator motor with a brush and further includes a commutator 14 and a brush 15.
  • the electric motor 2 is a DC electric motor that receives a DC power supply as an input.
  • the electric blower 1 further includes an air guide 4 into which air discharged from the rotary fan 3 flows, and a fan case 5 that houses the rotary fan 3.
  • the outer shell of the electric blower 1 is composed of a frame 40 and a fan case 5.
  • the rotor 10 (the mouth overnight) is the stator.
  • the rotor 10 rotates about the axis C of the shaft 13 as the center of rotation.
  • the rotator 10 rotates at high speed, for example, at 50,000 r pm (rev o I u t i o n s p e r m i n u t e ).
  • rotor 10 is an armature, and rotor core 1 1 (port core) and wound coil 1 2 wound around rotor core 1 1 via an insulator.
  • the winding coil 12 is a schematic ⁇ 2020/174878 6 ⁇ (: 170? 2020/000079
  • the rotor core 11 is a laminated body in which a plurality of electromagnetic steel plates are laminated in a direction in which the shaft center ⁇ of the shaft 13 extends (rotational axis direction).
  • the rotor core 11 has a plurality of tooth portions.
  • a shaft 13 serving as a rotation shaft is fixed to the center of the rotor 10.
  • the shaft 13 is, for example, a metal rod, and is fixed to the rotor core 1 1 so as to penetrate the rotor core 1 1.
  • the shaft 13 is fixed to the rotor core 11 by being press-fitted or shrink-fitted into the center hole of the rotor core 11.
  • the first portion 1 33 of the shaft 13 protruding from the rotor 10 to one side is supported by the first bearing portion 16.
  • the second portion 13 of the shaft 13 protruding from the rotor 10 to the other side is supported by the second bearing portion 17.
  • the first bearing portion 16 and the second bearing portion 17 are bearings that support the shaft 13. In this way, the shaft 13 is rotatably held by the first bearing portion 16 and the second bearing portion 17.
  • the first bearing portion 16 is fixed to the bracket 50.
  • the second bearing portion 17 is fixed to the bottom of the frame 40. That is, bracket 50 is the first bracket and frame 40 is the second bracket.
  • the first portion 1 3 3 of the shaft 13 projects from the first bearing portion 16.
  • the rotary fan 3 is attached to the tip of the shaft 13 protruding from the first bearing portion 16.
  • a commutator 14 is attached to the second portion 13 of the shaft 13.
  • the commutator 14 is arranged between the rotor core 11 and the second bearing portion 17 of the shaft 13.
  • the commutator 14 is composed of a plurality of commutator pieces (segments) that are insulated and separated from each other in the rotating direction of the shaft 13.
  • the commutator 14 is electrically connected to the winding coil 12 of the rotor 10. ⁇ 2020/174 878 7 ⁇ (: 170? 2020 /000079
  • the brush 15 shown in FIG. 3 is in contact with the commutator 14.
  • the brush 15 is a power feeding brush that supplies power to the rotor 10 by contacting the commutator 14.
  • the brush 15 is, for example, a force-brush.
  • a pair of brushes 15 is provided so as to be capable of sliding contact with the commutator 14.
  • the pair of brushes 15 are arranged so as to sandwich the commutator 14 so as to sandwich the commutator 14 therebetween.
  • the inner tips of the pair of brushes 5 are in contact with the commutator 14.
  • the armature current supplied to the brush 15 flows through the commutator 14 to the winding coil 12 of the rotor 10.
  • the stator 20 faces the rotor 10.
  • the stator 20 is arranged on the radially outer side of the rotor 10.
  • the stator 20 has a plurality of magnets 21 which are arranged at intervals in the circumferential direction of the rotor 10.
  • the magnet 21 is a field magnet that creates a magnetic flux for generating torque, and is, for example, a permanent magnet having 3 poles and 1 ⁇ ! poles.
  • Each of the plurality of magnets 21 has an arc shape with a substantially constant thickness in a top view seen from the side of the first portion 133.
  • the gap between the plurality of magnets 21 and the rotor 10 is larger at the left and right ends than in the central portion. The shape is wide.
  • the stator 20 is composed of two magnets 2 1 facing each other with the rotor 10 in between. A small air gap exists between the inner surface of each magnet 21 and the outer surface of the rotor 10 (rotor iron core 11). The magnet 21 is fixed to the yoke 30.
  • the yoke 30 surrounds the magnet 21.
  • the yoke 30 constitutes a magnetic circuit (field) together with the magnet 21. Therefore, the yoke 30 may be regarded as a part of the stator 20.
  • the yoke 30 has a cylindrical shape with a constant thickness.
  • the yoke 30 surrounds the rotor 10 and the stator 20 (magnet 21) as a whole.
  • the yoke 30 is made of a magnetic material such as iron.
  • the yoke 30 is made of an iron plate. ⁇ 2020/174878 8 ⁇ (: 170? 2020/000079
  • the yoke 30 is a tubular body having a substantially oval shape (race track shape) in an outer peripheral shape and an inner peripheral shape when viewed from the side of the first portion 1 3 3 in a top view.
  • the yoke 30 has an arc portion 3 1 and a straight portion 3 2 in a cross section. In this way, by providing the yoke 30 with the straight portion 32 so that the yoke 30 has a substantially oval cross-sectional shape, it is more magnetic than a yoke having a circular cross-section (that is, a cylindrical yoke). The route can be shortened. Therefore, the loss in the yoke 30 (magnetic path) can be suppressed.
  • a pair of magnets 21 are arranged inside the arc portion 31 of the yoke 30 so as to face each other with the rotor 10 interposed therebetween.
  • each of the pair of magnets 21 has a shape along the inner peripheral surface of the arc portion 31, and the outer peripheral surface of the magnet 21 and the inner peripheral surface of the arc portion 3 1 are in close contact with each other. It is arranged to.
  • the frame 40 is a housing (case) that houses the components of the electric motor 2, such as the rotor 10 and the stator 20.
  • the frame 40 is an outer shell member (outer shell) of the electric blower 1 and the electric motor 2.
  • the frame 40 is a bottomed tubular body having an opening 40 3.
  • the yoke 30 housed in the frame 40 and the frame 40 are separate members.
  • the frame 40 and the yoke 30 can be made of different materials.
  • the frame 40 can be made of a non-magnetic material as opposed to the yoke 30 made of a magnetic material. Therefore, the frame 40 can be made of a light and durable metal material.
  • the frame 40 is made of aluminum.
  • each of the side wall and bottom of the frame 40 has a plurality of exhaust ports 40 for discharging the air sucked by the rotation of the rotary fan 3.
  • a pair of exhaust ports 40 facing each other are formed on the side wall of the frame 40.
  • opposed _ pairs of exhaust ports 40 are formed on the bottom of the frame 40.
  • the outer surface of the yoke 30 and the inner surface of the frame 40 are ⁇ 2020/174878 9 ⁇ (: 170? 2020/000079
  • a gap ⁇ which serves as a ventilation path in the direction of the axis 0 of the shaft 13 (rotational axis direction).
  • a plurality of gaps ⁇ are formed. Specifically, four gaps are formed.
  • the frame 40 has a bulging portion 41 in which a part of the side wall of the frame 40 bulges outward in the radial direction (that is, outward in the radial direction around the axis O). ..
  • the bulging portion 41 is a portion of the side wall portion of the frame 40 that bulges in a direction away from the yoke 30 that intersects with the shaft 13 that is the rotating shaft.
  • the clearance ⁇ is a space area between the bulge 41 and the yoke 30.
  • the bulging portion 41 extends in the direction in which the axis 0 of the shaft 13 extends (the rotation axis direction).
  • the clearance ⁇ also extends in the direction in which the axis O of the shaft 13 extends.
  • the bulging portion 41 extends along the rotating direction of the shaft 13 (rotating shaft). Specifically, the bulging portion 41 extends in an arc shape along the rotation direction of the shaft 13.
  • the bulging portion 41 is, for example, a rib formed in a protruding shape, and can be formed by pressing the side wall portion of the frame 40.
  • a plurality of bulging portions 41 are provided in one-to-one correspondence with the plurality of gaps ⁇ .
  • a plurality of bulging portions 41 are provided at equal intervals in the rotation direction of the shaft 13. Specifically, as shown in FIG. 5, four bulges 41 are provided at 90° intervals along the rotation direction. Therefore, four gaps are also formed at 90° intervals along the circumferential direction.
  • the plurality of bulging portions 4 1 are provided at a position facing the magnet 21 and at a position facing a space area in the circumferential direction between two adjacent magnets 21. It is included.
  • the pair of bulging portions 41 facing each other is provided at a position facing the pair of magnets 21.
  • the remaining pair of bulging portions 41 of the four bulging portions 41 is provided at a position facing a circumferential space region between the pair of magnets 21.
  • a portion of the side wall portion of the frame 40 between two adjacent bulging portions 41 is a concave portion 42.
  • the bulging portion 4 1 and below on the side wall of the frame 40 ⁇ 2020/174878 10 boxes (: 170? 2020/000079
  • the outer part is a recess 42.
  • the recess 42 is formed on the side wall of the frame 40.
  • the shape of the cross section of the frame 40 is petal-like with the outer diameter of the part other than the recess 42 (that is, the part of the bulge 41) increased, as shown in Fig. 5. There is.
  • the recess 42 of the frame 40 is in contact with the yoke 30.
  • the yoke 30 is supported by the frame 40 at the location where the recess 42 is formed. That is, the yoke 30 is held by the frame 40.
  • the yoke 30 is held by the frame 40 by being pressed by the recess 42.
  • the yoke 30 is held on the frame 40 by, for example, press fitting or clearance fitting.
  • the yoke 30 may be fixed to the frame 40 by caulking or the like.
  • the inner surface of recess 42 is in surface contact with the outer surface of yoke 30.
  • the inner surface of the recess 42 is a curved surface and the outer surface of the yoke 30 is a curved surface, the curved surfaces are in close contact with each other. As a result, the yoke 30 can be stably held by the frame 40.
  • the contact state between the recess 42 and the yoke 30 is not limited to the surface contact, and may be the line contact or the point contact. However, the surface contact allows the yoke 30 to be held on the frame 40 in a more stable state.
  • the bracket 50 covers the opening 40 3 of the frame 40. As shown in FIG. 6, the bracket 50 does not completely close the opening 40 3 of the frame 40, but partially covers the opening 40 3 of the frame 40. That is, when the bracket 50 is attached to the frame 40, the air rectified by the air guide 4 flows into the frame 40.
  • the bracket 50 is provided with a plurality of through holes as openings through which the air rectified by the air guide 4 passes. Specifically, as shown in FIG. 6, the bracket 50 has an inner through hole 5033 (first section) located radially inward when viewed from above the first section 133. Through hole) and the inner through hole 50 3 ⁇ 2020/174878 1 1 ⁇ (: 170? 2020/000079
  • An outer through hole (50) (second through hole) located on the outer side is provided.
  • FIG. 7 is a perspective view of bracket 50 in electric blower 1 according to the embodiment.
  • the bracket 50 is located in the central portion 51, which is a portion including the center of the bracket 50, and on the outer side in the radial direction from the central portion 51.
  • the inner ring-shaped inner ring 5 2 (first ring-shaped part) that surrounds the center part 5 1 and the outer ring-shaped part 5 3 that is located radially outside of the inner ring-shaped part 52 and surrounds the inner ring-shaped part 5 2 (Second annular portion).
  • the central portion 5 1 is configured so as to project in the direction of the axis 0 of the shaft 13 and has a concave portion on the frame 40 side.
  • the first bearing 16 is fixed in this recess.
  • the central portion 5 1 is provided with a shed hole through which the shaft 13 is slid.
  • the inner annular portion 52 is provided along the outer surface corresponding to the recessed portion 42 of the frame 40.
  • the diameter of the inner annular portion 52 is substantially the same as the diameter of the portion of the frame 40 corresponding to the recess 42.
  • the outer annular portion 53 is located outside the frame 40 in the top view seen from the first portion 133. Specifically, the outer annular portion 53 is located outside the bulging portion 41 of the frame 40. Therefore, the diameter of the outer annular portion 53 is larger than the diameter of the portion corresponding to the bulging portion 41 of the frame 40.
  • the inner annular portion 52 has a thin plate shape, while the outer annular portion 5 3 has a thin cylindrical shape. That is, the outer annular portion 53 has a side wall portion having a side wall surface. As a result, as shown in FIG. 4, an air passage is formed between the outer surface of the frame 40 and the side wall portion of the outer annular portion 53.
  • the inner through hole 50 3 is provided between the central portion 5 1 and the inner annular portion 52.
  • the inner through hole 50 3 is the first inner communicating portion 5 communicating with the inside of the frame 40. ⁇ 2020/174878 12 ⁇ (: 170? 2020/000079
  • the first inside communication portion 5 08 1 is located inside the frame 40.
  • the inner through hole 508 is composed of only the first inner communicating portion 530.
  • the inner through hole 5033 communicates only with the inside of the frame 40, and does not communicate with the outside of the frame 40.
  • the plurality of inner through holes 503 thus configured are provided along the rotation direction of the shaft 13.
  • the inner through holes 50 3 are provided in the same number as the bulging portions 4 1 of the frame 40.
  • the plurality of inner through holes 50 3 are provided at equal intervals in the rotation direction of the shaft 13. Specifically, four inner through holes 50 3 are provided at equal intervals (that is, 90 ° intervals) along the rotation direction of the shaft 13.
  • Each inner through hole 50 3 extends along the rotation direction of the shaft 13.
  • the inner through-hole 5 0 3 is a long hole extending in the direction of rotation, have a substantially shape extending in an arc shape along the rotational direction of the shaft 1 3 with a constant width To do.
  • the outer through hole 50 is provided between the inner annular portion 52 and the outer annular portion 53.
  • the outer through hole 5013 communicates with the outer communicating portion 50 1 which communicates with the outside of the frame 40.
  • the outer communicating portion 5 0 1 ⁇ 1 is located outside the frame 40.
  • the through hole 50 is communicated with the second inner communicating portion 50 communicating with the inside of the frame 40. That is, the outer through hole 50 is not only in communication with the inside of the frame 40 but also with the outside of the frame 40.
  • the cave 2 is located inside the frame 40 in a top view seen from the side of the first portion 133. Specifically, the second inner communicating portion 50 sill 2 communicates with the inside of the frame 40 in the bulging portion 41. Therefore, as shown in FIG. 5, the second inner communicating portion 50 sill 2 communicates with the clearance ⁇ .
  • a plurality of outer through holes 50 are provided along the rotation direction of the shaft 13. ⁇ 2020/174878 13 (: 170? 2020/000079. Therefore, there are multiple outer communication parts 50 1 and second inner communication parts 50 2). The same number as the bulging portion 41 is provided.
  • the plurality of outer through holes 50 are provided at equal intervals in the rotation direction of the shaft 13. Specifically, the outer through holes 50 are The same number as the inner through holes 50 3 are provided, so that four outer through holes 50 are provided, and the four outer through holes 50 0 are provided along the rotation direction of the shaft 13 and so on. They are provided at intervals (that is, 90 ° intervals).
  • each of the outer through holes 50 extends, like the inner through hole 503, along the rotation direction of the shaft 13.
  • each outer through hole 50 is a long hole extending in the rotation direction, and like the inner through hole 50 3, it has a substantially constant width along the rotation direction of the shaft 13 3. And has a shape extending in an arc shape.
  • the width of the outer through hole 50 and the width of the inner through hole 503 are almost the same, but may be different.
  • the bracket 50 includes an inner bridge portion 5 4 (first bridge portion) located on the radially inner side and a radially outer side of the inner bridge portion 54. And an outer bridge portion 5 5 (second bridge portion) located.
  • the inner bridge portion 54 divides two inner through-holes 5033 adjacent to each other in the rotation direction of the shaft 13 and is horizontally extended between the center portion 51 and the inner annular portion 52. That is, the inner bridge portion 54 is connected so as to bridge the central portion 5 1 and the inner annular portion 52.
  • a plurality of inner bridge portions 54 are radially provided. Since the four inner through holes 50 3 are provided, the four inner bridge portions 54 are provided. The plurality of inner bridge portions 54 are arranged rotationally symmetrically. The four inner bridge portions 54 are provided at equal intervals (that is, 90 ° intervals) along the rotation direction of the shaft 13.
  • the outer bridge portion 5 5 partitions the two outer through holes 50 that are adjacent to each other in the rotation direction of the shaft 13 and is bridged between the inner annular portion 5 2 and the outer annular portion 5 3. There is. That is, the outer bridge portion 55 connects the inner annular portion 52 and the outer annular portion 53 so as to bridge them.
  • the outer bridge section 5 5 is ⁇ 2020/174878 14 ⁇ (: 170? 2020/000079
  • outer bridge portions 55 are provided. That is, the outer bridge portions 55 are provided in the same number as the inner bridge portions 54.
  • the four outer bridge portions 55 are provided at equal intervals (that is, 90 ° intervals).
  • the outer bridge portion 55 straddles the bulging portion 41 of the frame 40. Specifically, the outer bridge portion 55 crosses the center of the bulging portion 41, and bisects the second inner communicating portion 50 0 sill 2.
  • the inner and outer pride portions 54 and 55 are formed at different radial positions. In other words, the inner bridge portion 54 and the outer bridge portion 55 are displaced in the rotation direction of the shaft 13 3.
  • the four inner bridge portions 54 arranged at 90° intervals and the four outer bridge portions 55 arranged at 90° intervals are offset by 45° in the rotational direction.
  • the width of the inner bridge portion 54 and the width of the outer bridge portion 55 are substantially the same, but may be different.
  • the length of the inner ridge portion 5 4 and the length of the outer ridge portion 5 5 are substantially the same, but may be different.
  • the bracket 50 is a resin molded product, and is made of a resin material. As a result, even if the bracket 50 has a complicated shape, it can be easily manufactured.
  • the brackets 50 have the same shape when divided into four equal 90° intervals in the rotation direction of the shaft 13. That is, the bracket 50 is line-symmetric with respect to each of the X axis and the vertical axis.
  • the bracket 50 may be made of metal material. By constructing the bracket 50 with a metal material, the strength of the bracket 50 can be improved.
  • the bracket 50 is fixed to the frame 40.
  • a bracket for example, a bracket
  • the circle 50 and the frame 40 are joined to each other by the recess 42 which is a portion between the two adjacent bulges 41 of the side wall of the frame 40 and the inner annular portion 52 of the bracket 50. It is fixed by being done. In this case, the bracket 50 and the frame 40 can be fixed by caulking the bracket 50 and the frame 40. In this way, the recess 4 2 formed by the bulge 41 and the bracket 5 0 ⁇ By setting the outer diameter of the inner ring 52 of 2020/174878 1 5 (: 170? 2020/000079) to be the same, the bracket 50 and the frame 40 can be easily fixed.
  • the armature current supplied to the brush 15 flows through the commutator 14 to the winding coil 12 of the rotor 10.
  • a magnetic flux is generated in the rotor 10 and the magnetic force generated by the interaction between the magnetic flux of the rotor 10 and the magnetic flux generated by the magnet 21 of the stator 20 causes the torque to rotate the rotor 10. And the rotor 10 rotates.
  • the rotary fan 3 sucks air into an outer shell (housing) constituted by a frame 40 and a fan case 5.
  • the rotary fan 3 is, for example, a centrifugal fan that can obtain a high suction pressure.
  • wind pressure is generated, air is sucked in through the intake port 50 of the fan case 5, and air is discharged through the rotating fan 3. Air discharged from the rotating fan 3 flows into the air guide 4.
  • the air guide 4 has a function of forming a flow path of an air flow.
  • the air guide 4 rectifies and discharges the air sucked from the intake port 50 of the fan case 5 by the rotation of the rotary fan 3.
  • the air discharged from the air guide 4 flows into the inside of the frame 40 through the inner through hole 50 3 of the bracket 50, and at the same time, through the outer through hole 50 of the bracket 50. And is discharged to the outside of the frame 40. More specifically, the air discharged from the air guide 4 passes through the first inner communication portion 5031 through the inner through hole 5033 formed in the bracket 50 and passes through the frame 40. Flows into the interior of. Further, the air discharged from the air guide 4 is discharged to the outside of the frame 40 through the outer through hole 50 formed in the bracket 50 and the outer communicating portion 5101. It
  • FIG. 8 is a perspective view of the air guide 4 in the electric blower 1 according to the embodiment. As shown in Fig. 8, the air guide 4 has a gap between the main body 43 and the main body 43. ⁇ 2020/174878 16 ⁇ (: 170? 2020/000079
  • a ring-shaped annular portion 4 13 that surrounds the main body portion 4 3 with a gap therebetween.
  • the gap between the main body portion 43 and the annular portion 4 is a ventilation passage.
  • the main body 43 is a disc body having a through hole for fixing it to the central portion 51 of the bracket 50.
  • the main body portion 43 and the annular portion 413 are arranged at different positions in the direction of the shaft center 0 of the shaft 13.
  • a plurality of connecting plates 4_Rei is provided between the main body portion 4 3 and the annular portion 4, and connects the main body portion 4 3 and the annular portion 4 spoon.
  • the connecting plate 40 is a guide plate for forming a flow path of the air flow.
  • Each of the plurality of connections has a plate shape that is curved in an arc shape and is radially arranged.
  • four connecting plates 4_Rei is arranged so as swirling tint toward the outside from the through hole of the main body portion 4 3.
  • the connecting plate 40 is preferably swirled in the same direction as the rotating direction of the rotary fan 3. As a result, the flow path of the airflow can be efficiently formed by the connecting plate 40.
  • the annular part 4 serves as a support part that supports the end of the side wall 5 of the fan case 5 in the direction of the axial center 0 of the shaft 13 (thrust direction). As shown in FIG. 4, the annular portion 4 is located between the side wall portion 5 of the fan case 5 and the outer annular portion 53 of the bracket 50.
  • the air guide 4 is made of, for example, a resin material, but may be made of a metal material.
  • the fan case 5 is a casing that houses the rotary fan 3.
  • the fan case 5 is a cover that covers the rotary fan 3 and the air guide 4.
  • the fan case 5 is a metal made of a metal material. ⁇ 2020/174878 17 ⁇ (: 170? 2020/000079
  • Fan case 5 includes a cover portion 3 which covers the upper part portion of rotating fan 3 and Eagai de 4, and a side wall portion 5 13 covering the side portion of the rotating fan 3 and Eagai de 4.
  • the fan case 5 has an intake port 50 (intake port) for sucking the outside air.
  • Inlet 5_Rei is transmural hole circular provided in a central portion of the lid 3.
  • the fan case 5 is fixed to the bracket 50. Specifically, as described above, the fan case 5 is fixed to the bracket 50 via the air guide 4.
  • the outer diameter of the fan case 5 (outer diameter of the side wall 5 sill) is almost the same as the outer diameter of the outer annular portion 5 3 of the bracket 50.
  • a fan case spacer having an opening corresponding to the air intake port 50 may be attached to the air intake port 50 of the fan case 5.
  • the rotary fan 3 rotates, and the fan case 5 has an intake port 50 and an internal fan case 5. Air is sucked. As a result, air flows into the rotary fan 3, and the air sucked by the rotary fan 3 is compressed to a high pressure by the fan blades included in the rotary fan 3 and radially outward from the outer peripheral side portion of the rotary fan 3. Emitted. The air discharged from the rotary fan 3 flows into the air guide 4 along the side wall 5 of the fan case 5, and reaches the bracket 50 through the air passage of the air guide 4.
  • the bracket 50 has an inner through hole 5033 communicating with the first inner communicating portion 5031 communicating with the inside of the frame 40, An outer through hole 50 is provided which communicates with an outer communicating portion 50 1 which communicates with the outside of the frame 40.
  • the other part of the air that has reached the bracket 50 does not pass through the inside of the frame 40, but passes through the outer communication portion 50 0 1 of the bracket 50 and the electric blower. Directly discharged out of 1.
  • the air passing through the outer communication portion 50 0 1 of the bracket 50 is the air passage between the side wall portion of the outer annular portion 5 3 of the bracket 50 and the outer surface of the frame 40. Is discharged to the outside of the electric blower 1.
  • the airflow can be discharged to the outside of the electric blower 1 without causing a loss due to passing through the inside of the frame 40.
  • the electric blower 1 As described above, in the electric blower 1 according to the present embodiment, a part of the sucked air is used as the cooling air, so that the inner portion of the electric motor 2 can be cooled without deteriorating the performance. it can. Therefore, according to the electric blower 1 of the present embodiment, it is possible to achieve both high performance and cooling of the electric motor.
  • FIG. 9 is a diagram showing the performance of the conventional electric blower 1 shown in FIG.
  • FIG. 10 is a diagram showing the performance of the electric blower 1 according to the embodiment.
  • the inner through hole 50 3 and the outer through hole 50 of the bracket 50 extend along the rotation direction of the shaft 13. ing.
  • the outer through hole 50 of the bracket 50 further has the second inner communicating portion 50 communicating with the inside of the frame 40 in the bulging portion 41. .. ⁇ 2020/174878 19 ⁇ (: 170? 2020/000079
  • the outer through hole 5013 a portion communicating with the outside of the frame 40 (outer communicating portion 5 0 1 ⁇ 1) and a portion communicating with the inside of the frame 40 (second inner side). There is a communication part 50).
  • This makes it possible to change the size of the bulging portion 41 of the frame 40 or the size of the outer through hole 50 depending on the performance required of the electric blower 1.
  • the ratio of the air passing through the inside and the outside of the frame 40 can be adjusted. That is, it is possible to finely adjust the balance between the blowing performance and the cooling effect according to the required performance of the electric blower 1. More specifically, the air discharged from the air guide 4 passes through the second through hole 50 formed in the bracket 50, passes through the second inner communication portion 50, and then the air in the frame 40. It flows into the interior.
  • the bracket 50 has the inner bridge portion 5 4 and the outer bridge portion 55, and the inner bridge portion 5 4 and the outer bridge portion 5 5 are arranged in the radial direction. They are provided at different positions.
  • the inner bridge portion 5 4 and the outer bridge portion 5 5 are provided in the same radial direction, and the inner bridge portion 5 4 and the outer bridge portion 5 5 are combined to form one straight-line bridge.
  • the mechanical strength of the bracket 50 can be improved as compared with the case of. Therefore, even if the bracket 50 is made of a resin material instead of a metal material, a desired strength can be easily ensured. In other words, the ventilation performance can be improved by increasing the ventilation cross-sectional area while ensuring the strength of the bracket 50. ⁇ 2020/174 878 20 boxes (: 170? 2020/000079
  • the outer bridge portion 55 of the bracket 50 is the exit portion 4 of the frame 40.
  • the bracket 50 5 Air discharged from the bracket 50 to the outside of the frame 40 without passing through the inside of the frame 40, rather than the air discharged from the electric blower 1 after passing through the inside of the frame 40. You can get a lot of air. Therefore, the blowing performance can be improved.
  • the plurality of bulging portions 41 of the frame 40 are provided at equal intervals along the rotation direction of the shaft 13.
  • the plurality of inner through holes 50 3 and the plurality of outer through holes 50 of the bracket 50 are all provided at equal intervals along the rotating direction of the shaft 13. The same number of inner through-holes 50 3 and outer through-holes 50 are provided.
  • the number of the bulging portions 41 of the frame 40 is the same as the number of the inner through holes 503 and the outer through holes 50 of the bracket 50. Specifically, each of the bulging portion 41, the inner through hole 503, and the outer through hole 50 is formed in fours.
  • the bracket 50 is axisymmetric with respect to each of the X-axis direction and the vertical axis direction.
  • the air volume/ ⁇ lance of the air passing through the inside and outside of the frame 40 can be made more uniform over the entire circumference of the frame 40. Therefore, the performance of the electric blower 1 can be further improved.
  • the electric motor 2 has the frame 40 corresponding to the casing having the opening 40 3, the protruding first portion 33, and the first portion 1 3 3.
  • a shaft 13 which is a rotating shaft having a second portion 13 which protrudes to the side, a rotor 10 which is arranged in a frame 40 corresponding to a casing and to which the shaft 13 is fixed, and a casing
  • a stator 20 arranged in a frame 40 corresponding to the body and facing the rotor 10 and a bracket 50 covering the opening 40 3 are provided.
  • the bracket 50 has an inner through hole 5033 communicating with the first inner communicating portion 5031 communicating with the inside of the frame 40 corresponding to the casing, and the shaft 1300 rather than the inner through hole 5033.
  • An outer through hole 50 is provided outside of the frame 40, which is located on the outer side in the radial direction, and communicates with the outer communicating portion 50 which communicates with the outside of the frame 40 corresponding to the housing.
  • the electric blower 1 of the present embodiment includes an electric motor 2 and a rotary fan 3 attached to a shaft of the electric motor 2.
  • the electric blower 1 may include a fan case 5 that covers the rotary fan 3, and an air guide 4 into which air discharged from the rotary fan 3 flows.
  • the fan case 5 may have a side wall portion 5 covering the side portions of the rotary fan 3 and the air guide 4.
  • the air guide 4 may have a support portion that supports the end of the side wall portion 5 in the axial direction of the rotating shaft.
  • the air guide 4 may have a main body portion 43 and an annular ring-shaped annular portion 4 that surrounds the main body portion 43 with a gap from the main body portion 43.
  • the supporting part may be the annular part 4 sack.
  • the number of the bulging portions 41 formed on the side wall portion of the frame 40 was four, but the number is not limited to this.
  • FIG. 11 is a perspective view of a frame 48 used in an electric blower 18 according to a modification.
  • Figure 1 ⁇ 2020/174878 22 ⁇ (: 170? 2020 /000079
  • FIG. 2 is a cross-sectional view of an electric blower 1 according to a modified example.
  • the number of the bulging portions 41 of the frame 40 may be different from the number of the inner through holes 50 3 and the outer through holes 50 of the bracket 50.
  • two bulging portions 41 are formed in the frame 48, whereas in the bracket 50, Four inner holes 50 3 and four outer holes 50 are formed.
  • the same components as those in the first embodiment are used for the parts other than the frame 40 and the bracket 50.
  • the electric blower 18 shown in Figs. 11 and 12 has a reduced number of bulging portions 41 as compared with the electric blower 1 in the above-described embodiment.
  • the proportion of the air passing from the bracket 50 to the inside of the frame 408 and then being discharged to the outside of the electric blower 18 is reduced to reduce the amount of air from the bracket 50 to the frame 408. It is possible to increase the proportion of air directly discharged to the outside of the frame 408 without passing through the inside. Therefore, the blowing performance can be improved. Therefore, if cooling effect is not required so much, it is advisable to use the electric blower 18 shown in FIGS. 11 and 12. As described above, by changing the number of the bulging portions 41, the balance between the blowing performance and the cooling effect can be finely adjusted according to the performance required of the electric blower 1.
  • the number of the bulging portions 41 is not limited to four or two, and may be one, three, or five or more. For example, even when three bulges 41 are formed, three bulges 41 are circumferentially spaced at 120° intervals with the two magnets 21 in the frame 40 left. Can be formed into 40. When forming a plurality of bulging portions 41, the bulging portions 41 may be formed at equal intervals in the rotation direction, but the invention is not limited to this. In addition, the frame without the bulge 41 is formed. ⁇ 2020/174878 23 ⁇ (: 170? 2020/000079
  • FIG. 13 is a perspective view of another bracket 508 of the electric blower according to the modified example.
  • the outer bridge portion 5 5 when viewed from the side of the first portion 1 3 3 of the shaft 13 3, the outer bridge portion 5 5 is inclined with respect to the radial direction. May be.
  • the outer bridge portion 55 8 may be inclined to match the inclination of the connecting plate 40 of the air guide 4. As a result, it is possible to reduce the loss of the air passage for the air flow discharged from the air guide 4 into and out of the frame 40 through the bracket 58. Therefore, the performance of the electric blower can be further improved.
  • FIG. 14 is a perspective view of another bracket 50 of the electric blower according to the modification.
  • the surface of the outer bridge portion 55 may be inclined with respect to the rotation surface of the shaft 13 as in the case of bracket 50 shown in FIG. That is, it is preferable that the outer bridge portion 55 has an inclined surface that inclines toward the bottom of the frame 40. As a result, it is possible to reduce the loss of the air passage in the air flow discharged from the air guide 4 into and out of the frame 40 through the bracket 50. Therefore, the performance of the electric blower can be further improved.
  • the frame 40 is made of a metal material such as aluminum, but the present invention is not limited to this.
  • the frame 40 may be made of a non-magnetic material such as a resin material.
  • a resin material such as a resin material.
  • the frame 40 made of resin it is possible to make it larger than the metal frame 40 of the same weight. Therefore, the gap ⁇ can be made wider.
  • the frame 40 is made of resin, the weight can be further reduced as compared with the metal frame 40 of the same size.
  • the frame 40 is made of resin. ⁇ 2020/174878 24 ⁇ (: 170? 2020 /000079
  • the frame 40 can be easily molded.
  • the number of the magnets 21 constituting the stator 20 is two, but the present invention is not limited to this.
  • the number of magnets 21 may be four.
  • the electric motor 2 was an electric motor with a brush, but the present invention is not limited to this.
  • the electric motor 2 may be a brushless electric motor.
  • the stator 20 may be composed of the stator core and the winding coil wound around the stator core, instead of the magnet 21.
  • the yoke portion is formed on the stator core, the yoke 30 functions as an auxiliary yoke.
  • the electric blower 1 is used for an electric vacuum cleaner
  • the present invention is not limited to this.
  • the electric blower 1 may be used for an air duct or the like.
  • the electric motor 2 is used for the electric blower 1
  • the present invention is not limited to this, and the electric motor 2 may be used for an electric device other than the electric blower 1. Further, the electric motor 2 may be used not only for household appliances but also for industrial appliances such as automobile appliances.
  • the electric motor and the electric blower of the present disclosure can be used for various electric devices including household electric devices such as electric vacuum cleaners such as rechargeable vacuum cleaners. Explanation of symbols

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

La présente invention comprend : un boîtier comportant une ouverture ; un arbre qui est un arbre tournant comportant une première section en saillie et une seconde section qui fait saillie vers le côté opposé par rapport à la première section ; un rotor qui est disposé dans le boîtier et auquel l'arbre est fixé ; un stator qui est disposé dans le boîtier en regard du rotor ; et un support recouvrant l'ouverture. Le support est pourvu : d'un trou traversant interne conduisant à une première partie de communication interne communiquant avec l'intérieur du boîtier, et d'un trou traversant externe qui est positionné davantage vers l'extérieur, dans la direction radiale de l'arbre, que le trou traversant interne et qui conduit à une partie de communication externe communiquant avec l'extérieur du boîtier.
PCT/JP2020/000079 2019-02-28 2020-01-06 Moteur électrique et soufflante électrique Ceased WO2020174878A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-036762 2019-02-28
JP2019036762A JP2022062289A (ja) 2019-02-28 2019-02-28 電動機及び電動送風機

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Publication Number Publication Date
WO2020174878A1 true WO2020174878A1 (fr) 2020-09-03

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WO (1) WO2020174878A1 (fr)

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EP3979470A3 (fr) * 2020-10-05 2022-08-03 LG Electronics Inc. Moteur électrique

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Publication number Priority date Publication date Assignee Title
GB2629637A (en) * 2023-05-05 2024-11-06 Dyson Technology Ltd Brushless permanent magnet motor

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Publication number Priority date Publication date Assignee Title
JPS56133998U (fr) * 1980-03-11 1981-10-12
JPS60166798A (ja) * 1984-02-10 1985-08-30 Matsushita Electric Ind Co Ltd 電動送風機
JPS649466U (fr) * 1987-07-03 1989-01-19
JP2002021794A (ja) * 2000-07-12 2002-01-23 Matsushita Electric Ind Co Ltd 電動送風機及びそれを用いた電気掃除機
JP2002027707A (ja) * 2000-07-03 2002-01-25 Mitsubishi Electric Corp 電動送風機
JP2011152042A (ja) * 2003-12-11 2011-08-04 Toshiba Corp 車両用電動機

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Publication number Priority date Publication date Assignee Title
JPS56133998U (fr) * 1980-03-11 1981-10-12
JPS60166798A (ja) * 1984-02-10 1985-08-30 Matsushita Electric Ind Co Ltd 電動送風機
JPS649466U (fr) * 1987-07-03 1989-01-19
JP2002027707A (ja) * 2000-07-03 2002-01-25 Mitsubishi Electric Corp 電動送風機
JP2002021794A (ja) * 2000-07-12 2002-01-23 Matsushita Electric Ind Co Ltd 電動送風機及びそれを用いた電気掃除機
JP2011152042A (ja) * 2003-12-11 2011-08-04 Toshiba Corp 車両用電動機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3979470A3 (fr) * 2020-10-05 2022-08-03 LG Electronics Inc. Moteur électrique
AU2021240325B2 (en) * 2020-10-05 2023-07-13 Lg Electronics Inc. Electric motor
US11923753B2 (en) 2020-10-05 2024-03-05 Lg Electronics Inc. Electric motor

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