WO2020242222A1 - 모터 - Google Patents
모터 Download PDFInfo
- Publication number
- WO2020242222A1 WO2020242222A1 PCT/KR2020/006922 KR2020006922W WO2020242222A1 WO 2020242222 A1 WO2020242222 A1 WO 2020242222A1 KR 2020006922 W KR2020006922 W KR 2020006922W WO 2020242222 A1 WO2020242222 A1 WO 2020242222A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- magnet
- disposed
- protrusion
- cover
- 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
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- 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
Definitions
- the embodiment relates to a motor.
- a motor is a device that converts electrical energy into mechanical energy to obtain rotational force, and is widely used in vehicles, home electronics, and industrial equipment.
- the electronic power steering system in which the motor is used (hereinafter referred to as the Electronic Power Steering System, referred to as EPS) guarantees turning stability and provides rapid resilience by driving the motor in the Electronic Control Unit according to the driving conditions. do. Accordingly, the driver of the vehicle can drive safely.
- EPS Electronic Power Steering System
- the motor includes a shaft and a stator.
- the shaft can be hollow.
- the magnet may be attached to the outer peripheral surface of the shaft.
- an adhesive is used to fix the magnet to the shaft.
- an adhesive there is a problem that it takes a lot of time to cure.
- the magnet is overmolded, a problem in which the magnet is twisted may occur, and it is difficult to confirm this.
- overmolding since the thickness is thick, there is a difficult problem in securing the stator and the gap.
- the embodiment is to solve the above problems, and an object thereof is to provide a motor capable of aligning and fixing magnets disposed on an outer peripheral surface of a hollow shaft.
- An embodiment for achieving the above object includes a stator, a hollow shaft disposed inside the stator, and a magnet disposed on an outer circumferential surface of the shaft, wherein the shaft includes a plurality of protrusions in contact with the magnet,
- the plurality of protrusions may provide a motor including a first surface protruding from an outer circumferential surface of the shaft and a second surface concavely disposed on an inner circumferential surface of the shaft.
- the embodiment includes a stator, a hollow shaft disposed inside the stator, and a magnet disposed on an outer circumferential surface of the shaft, wherein the shaft includes a plurality of second holes penetrating inside and outside the shaft, It is possible to provide a motor including a plurality of protrusions each disposed in the plurality of second holes, at least a portion of which protrudes from the outer circumferential surface of the shaft to contact the magnet.
- the plurality of protrusions are spaced apart along the circumferential direction of the shaft, and a circumferential distance between the plurality of protrusions may be greater than or equal to the width of the magnet.
- the plurality of protrusions are spaced apart from each other in the axial direction of the shaft, and the axial separation distance of the protrusions may be less than or equal to the length of the magnet.
- one of the plurality of protrusions is disposed along the axial direction of the shaft, and the axial length of the one protrusion may be greater than 1/2 of the length of the magnet.
- each of the first surface and the second surface may include at least one plane.
- the first surface may include a curved surface in contact with the magnet.
- the height from the outer peripheral surface of the shaft to the outer end of the protrusion may be smaller than the height of the magnet based on the radial direction of the shaft.
- the shaft includes first holes penetrating inside and outside, and the protrusion may extend from an edge of the first hole.
- the cover disposed outside the magnet, and the cover may include a groove in which the protrusion is disposed.
- a screw thread may be disposed in the side surface of the protrusion and the second hole.
- a knurled structure may be disposed on the protrusion.
- An embodiment for achieving the above object includes a stator, a shaft disposed inside the stator, a magnet coupled with the shaft, and a cover disposed outside the magnet, wherein the cover includes a first part, the It includes a second part extending from one side of the first part, the inner surface of the magnet is in contact with the outer surface of the shaft, the inner surface of the magnet is in contact with the outer surface of the shaft, and the outer surface of the magnet is the first part Is in contact with the inner surface of the second part, some of the inner surfaces of the second part are in contact with the outer surface of the shaft, and the rest are arranged spaced apart from the outer surface of the shaft, so that a space is disposed between the outer surface of the shaft and the inner surface of the second part It can provide a motor that can be used.
- the cover includes a third part extending from the other side of the first part, and some of the inner surfaces of the third part are in contact with the outer surface of the shaft, and the rest are spaced apart from the outer surface of the shaft.
- a space may be disposed between the outer surface of the shirt and the other end surface of the magnet.
- the cover includes a plurality of first regions that are spaced apart in a circumferential direction from the center of the shaft, and the radial distance from the outer surface of the shaft to the first region is from the outer surface of the shaft to the magnet. It may be less than the shortest radial distance to the outer surface.
- the magnet includes a first unit magnet and a second unit magnet, the first region is disposed between the first unit magnet and the second unit magnet, and the first region is along an axial direction. Can be placed.
- the cover may include a second region forming a double layer in the radial direction at the center of the axis.
- the cover in the second region, includes a first layer and a second layer stacked on the first layer, and one edge of the second layer is disposed obliquely to one edge of the first layer Motor.
- the cover may include a third region having a different thickness in the radial direction at the axial center.
- the outer surface of the cover may include a stepped area.
- the cover may be a member in which the fiber is impregnated with epoxy.
- the shaft includes a protrusion in contact with the magnet, and the protrusion may be disposed to be spaced apart from the cover.
- the magnet when the magnet is wrapped with over-molding or can, it provides an advantageous effect of preventing the magnet from flowing.
- the size of the first or protrusion can be reduced, and the number can be increased, so that the position of the magnet can be more precisely guided.
- the first or protrusion can be easily formed through embossing or punching.
- the position of the magnet can be confirmed from the outside of the cover, there is an advantage of being able to easily identify defects of the magnet.
- FIG. 1 is a view showing a motor according to an embodiment
- Figure 2 is a perspective view showing the shaft
- 3 is a side cross-sectional view of the shaft showing the projection of the shaft
- FIG. 4 is a side cross-sectional view of a shaft showing a protrusion modification example
- FIG. 5 is a side cross-sectional view of the shaft showing another modified example of the protrusion
- 6 and 7 are side cross-sectional views of the shaft showing another modified example of the protrusion
- FIG. 8 is a perspective view showing a shaft in which a magnet is disposed on an outer circumferential surface
- 11 is a front view of the shaft comparing the height of the protrusion and the height of the magnet
- FIG. 13 is a side cross-sectional view of the shaft shown in FIG. 12;
- 15 is a view showing a projection disposed on the lower side of the magnet
- 16 is a view showing projections respectively disposed on the upper and lower sides of the magnet
- 17 is a view showing a shaft including a projection and a second hole
- FIG. 18 is a perspective view of a shaft including a modification example of the protrusion
- 19 is a side cross-sectional view of a shaft over-molded to have a cover disposed thereon.
- 20 is a view showing a shaft in which a cover is disposed
- 21 is a view showing a state surrounding a cover in a state in which the magnet is disposed on the outer peripheral surface of the shaft;
- Figure 22 is a side cross-sectional view of the shaft, the magnet and the cover,
- 24 is a plan cross-sectional view of a shaft and a magnet showing a second region and a third region of the cover;
- 25 is a view showing one edge of a cover in a second area
- 26 is a perspective view of a shaft including a projection
- Fig. 27 is a plan cross-sectional view of a magnet and a shaft including projections.
- the singular form may include the plural form unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and (and) B and C”, it is combined with A, B, and C. It may contain one or more of all possible combinations.
- first, second, A, B, (a), and (b) may be used in describing the constituent elements of the embodiment of the present invention.
- a component when a component is described as being'connected','coupled' or'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also the component and It may also include the case of being'connected','coupled' or'connected' due to another component between the other components.
- top (top) or bottom (bottom) when it is described as being formed or disposed on the “top (top) or bottom (bottom)” of each component, the top (top) or bottom (bottom) is one as well as when the two components are in direct contact with each other. It also includes a case in which the above other component is formed or disposed between the two components.
- upper (upper) or lower (lower) when expressed as "upper (upper) or lower (lower)", the meaning of not only an upward direction but also a downward direction based on one component may be included.
- FIG. 1 is a view showing a motor according to an embodiment.
- a motor may include a shaft 100, a magnet 200, a stator 300, a cover 400, a housing 500, and a bus bar 600.
- inside means a direction arranged toward the shaft 100 based on the radial direction of the motor, and “outside” means a direction opposite to the inside.
- the shaft 100 may be a hollow member with one side open. In the axial direction, both ends of the shaft 100 may be rotatably supported by bearings, respectively.
- the shaft 100 may be arranged so that portions having different outer diameters are divided along the axial direction.
- the magnet 200 is disposed on the outer peripheral surface of the shaft 100.
- the magnet 200 rotates in conjunction with the rotation of the shaft 100.
- the stator 300 is disposed outside the shaft 100 and the magnet 200.
- the stator 300 may include a stator core 310, an insulator 320 mounted on the stator core 310, and a coil 330 wound around the insulator 320.
- the coil 330 forms a magnetic field.
- the stator core 310 may be a single member or a combination of a plurality of divided cores.
- the stator core 310 may be formed in a form in which a plurality of plates in the form of a thin steel sheet are stacked together, but is not limited thereto.
- the stator core 310 may be formed as a single product.
- the cover 400 fixes the magnet 200 to the shaft 100.
- the cover 400 surrounds the magnet 200 and a partial region of the shaft 100.
- the cover 400 is a mold member formed through over-molding. It may be a can member or an adhesive member surrounding the magnet 200.
- the housing 500 may be disposed outside the stator 300.
- the housing 500 may be a cylindrical member with an open top.
- the housing 500 accommodates the shaft 100, the magnet 200, the stator 300, and the cover 400 inside.
- the housing 500 may accommodate a bearing supporting the shaft 100.
- the bus bar 600 is disposed above the stator 300.
- the bus bar 600 connects the coils 330 wound around the stator 300 core.
- FIG. 2 is a perspective view showing the shaft 100
- FIG. 3 is a side cross-sectional view of the shaft 100 showing the protrusion 110 of the shaft 100.
- the shaft 100 is a hollow member and may be formed through press processing.
- the shaft 100 includes a plurality of protrusions 110 in contact with the magnet 200.
- the plurality of protrusions 110 are disposed on the outer peripheral surface of the shaft 100.
- the plurality of protrusions 110 may be spaced apart from each other along the circumferential direction O of the shaft 100.
- the plurality of protrusions 110 may be spaced apart from each other along the axial direction X of the shaft 100. This protrusion 110 serves to align and fix the magnet 200 disposed on the outer circumferential surface of the shaft 100.
- the plurality of protrusions 110 includes a first surface 111 and a second surface 112.
- the first surface 111 may protrude from the outer peripheral surface of the shaft 100.
- the second surface 112 may be concavely disposed on the inner peripheral surface of the shaft 100.
- the first surface 111 may include a first-first surface 111a and a first-second surface 111b.
- the 1-1th surface 111a is a portion protruding from the outer peripheral surface of the shaft 100.
- the 1-2nd surface 111b connects the outer circumferential surface of the shaft 100 and the 1-1th surface 111a.
- the 1-1th surface 111a may include a flat surface, and the 1-2nd surface 111b may include a curved surface in contact with the magnet 200.
- the curved surface of the 1-2nd surface 111b is in line contact with the side surface of the magnet 200 to induce the magnet 200 to be inserted more smoothly between the protrusion 110 and the protrusion 110.
- a knurled structure to the 1-2th surface 111b, it is possible to increase the fixing force between the shaft and the magnet.
- the second surface 112 may include a 2-1 surface 112a and a 2-2 surface 112b.
- the 2-1 surface 112a is a portion formed to be concave than the inner peripheral surface of the shaft 100.
- the 2-2 surface 112b connects the inner peripheral surface of the shaft 100 and the 2-1 surface 112a.
- the 2-1 surface 112a may include a flat surface, and the 2-2 surface 112b may include a curved surface.
- first and second surfaces 111 and 112 may be formed through embossing performed on the inside of the hollow shaft 100.
- the distance t1 between the first surface 111 and the second surface 112 may be the same as the thickness t2 of the shaft 100 around the protrusion 110.
- FIG 4 is a side cross-sectional view of the shaft 100 showing a modified example of the protrusion 110.
- the 1-2nd surface 111b may be disposed to be inclined toward the 1-1th surface 111a.
- the 2-2 surface 112b may be disposed to be inclined toward the 2-1 surface 112a.
- the shape of the side cross section of the protrusion 110 may have an approximately trapezoidal shape.
- the fixing force between the shaft and the magnet may be increased.
- FIG. 5 is a side cross-sectional view of the shaft 100 showing another modified example of the protrusion 110.
- a plurality of protrusions 110 may be disposed along the circumferential direction of the shaft 100, but one protrusion 110 may be disposed along the axial direction of the shaft 100.
- One protrusion 110 may have a first-first surface 111a and a second-first surface 112a extending along an axial direction, respectively.
- first and second surfaces 111 and 112 may be formed through a beading process performed on the inside of the hollow shaft 100.
- 6 and 7 are side cross-sectional views of the shaft 100 showing another modified example of the protrusion 110.
- the shaft 100 may include a first hole 113 penetrating the inner side and the outer side of the shaft 100.
- the first hole 113 may be formed in a square shape.
- the protrusion 110 may extend from the edge of the first hole 113.
- the side surface of the protrusion 110 may include a plane 114 in contact with the magnet 200.
- a plurality of such protrusions 110 may be disposed along the circumferential direction of the shaft 100.
- a plurality of protrusions 110 may be disposed along the axial direction of the shaft 100.
- the fixing force between the shaft 100 and the magnet 200 may be increased.
- the first surface 111 of the protrusion 110 may be disposed to be inclined downward.
- the second surface 112 of the protrusion 110 may also be disposed to be inclined downward.
- the first surface 111 of the protrusion 110 may be disposed to be inclined upward.
- the second surface 112 of the protrusion 110 may also be disposed to be inclined upward.
- protrusions 110 having various shapes as described above are illustrated, the present invention is not limited thereto, and may be modified into the protrusions 110 having various shapes formed through an embossing process made inside the shaft 100.
- protrusions 110 may be implemented in a small size, and the number of the protrusions 110 may be relatively increased compared to a general guide structure. Therefore, there is an advantage of being able to guide the position of the magnet 200 more precisely.
- FIG 8 is a perspective view showing the shaft 100 in which the magnet 200 is disposed on the outer peripheral surface.
- a plurality of magnets 200 are disposed on the outer peripheral surface of the shaft 100. Based on the circumferential direction of the shaft 100, the magnet 200 is disposed between the protrusion 110 and the protrusion 110. The side surface of the protrusion 110 is in contact with the side surface of the magnet 200.
- FIG. 9 is a view showing the separation distance of the protrusion 110
- FIG. 10 is a view showing the size of the magnet 200.
- the circumferential separation distance W1 of the protrusion 110 may be greater than or equal to the width W2 of the magnet 200. This is for the magnet 200 to be positioned between the protrusion 110 and the protrusion 110 based on the circumferential direction of the shaft 100.
- the axial separation distance L1 of the protrusion 110 may be less than or equal to the length L2 of the magnet 200. This is for guiding the magnet 200 by at least two protrusions 110 arranged in the same row in the axial direction.
- the length L3 of the protrusion 110 is the length L2 of the magnet 200 Can be greater than 1/2 of This is the minimum length of the protrusion 110 that can be guided and fixed by the protrusion 110 without the magnet 200 being twisted.
- 11 is a front view of the shaft 100 comparing the height of the protrusion 110 and the height of the magnet 200.
- the height H1 from the outer circumferential surface of the shaft 100 to the outer end of the protrusion 110 may be smaller than the height H2 of the magnet 200.
- the height H1 of the protrusion 110 may be based on the center of the width of the protrusion 110 in the circumferential direction of the shaft 100.
- the height H2 of the magnet 200 may be based on the width center of the protrusion 110 based on the circumferential direction of the shaft 100. This takes into account the position of the cover 400 covering the magnet 200.
- the protrusion 110 is illustrated, but in the case of the protrusion 120 of another type shown in FIGS. 17 to 19, the height from the outer peripheral surface of the shaft 100 to the outer end of the protrusion 120 is It may be smaller than the height (H2) of 200.
- FIG. 12 is a view showing the shaft 100 on which the cover 400 is disposed by being over-molded
- FIG. 13 is a side cross-sectional view of the shaft 100 shown in FIG. 12.
- the cover 400 may be a mold member formed by over-molding.
- This cover 400 includes a groove 410 in which the protrusion 110 is disposed. By arranging the protrusion 110 in the groove 410, the coupling force between the cover 400 and the shaft 100 is increased, and the coupling force between the cover 400 and the magnet 200 is increased.
- FIG 14 is a view showing the protrusions 110 disposed on the upper side and the left and right sides of the magnet 200.
- the protrusion 110 includes a 1-1 protrusion 110A disposed on the side of the magnet 200 and a 1-2 protrusion 110B disposed on the upper side of the magnet 200.
- the 1-2 protrusion 110B is disposed on the upper side of the magnet 200 and contacts the upper end of the magnet 200, thereby preventing the magnet 200 from being separated upward from the original position.
- 15 is a view showing the protrusions 110 disposed on the lower side and the left and right sides of the magnet 200.
- the protrusion 110 includes a 1-1 protrusion 110A disposed on the side of the magnet 200 and a 1-3 protrusion 110C disposed under the magnet 200.
- the 1-3 protrusions 110C are disposed under the magnet 200 and contact the lower end of the magnet 200, thereby preventing the magnet 200 from being separated from the original position to the lower side.
- 16 is a view showing the projections 110 disposed on the upper and lower sides of the magnet 200, respectively.
- the protrusion 110 is a magnet together with the 1-1 protrusion 110A disposed on the side of the magnet 200 and the 1-2 protrusion 110B disposed on the upper side of the magnet 200. It may include the 1-3 protrusions (110C) disposed on the lower side of the 200.
- the 1-2 protrusion 110B is in contact with the upper end of the magnet 200 to prevent the magnet 200 from escaping upward from the original position
- the 1-3 protrusion 110C is the lower end of the magnet 200 By contacting with, it is possible to prevent the magnet 200 from being separated from the original position to the lower side.
- the protrusion 120 of another shape shown in FIGS. 17 to 19 is also disposed on the upper side of the magnet 200 with the 1-1 protrusion disposed on the side of the magnet 200 It may include at least one of the 1-2 protrusions and the 1-3 protrusions 110C disposed under the magnet 200.
- 17 is a diagram illustrating a shaft 100 including a protrusion 120 and a second hole 130.
- the shaft 100 may include second holes 130 penetrating inside and outside the shaft 100.
- the plurality of second holes 130 may be disposed along the circumferential direction of the shaft 100.
- the plurality of second holes 130 may be disposed along the axial direction of the shaft 100.
- the plurality of second holes 130 may be formed through punching.
- the protrusions 120 may be respectively disposed in the plurality of second holes 130.
- the protrusion 120 is disposed so that at least a portion of the protrusion 120 protrudes from the outer peripheral surface of the shaft 100 while being inserted into the second hole 130.
- the protrusion 120 may be made of a plastic resin.
- the protrusion 120 is in contact with the magnet 200.
- a thread capable of increasing the coupling force between the protrusion 120 and the shaft 100 may be formed in a contact area between the side surface of the protrusion 120 and the shaft 100.
- a knurling structure for increasing a fixing force between the magnet 200 and the shaft 100 may be applied to a portion of the side surface of the protrusion 120 that does not contact the shaft 100.
- 18 is a perspective view of the shaft 100 including a modification example of the protrusion 120.
- a plurality of second holes 130 may be disposed along the circumferential direction, but one long-hole type second hole 130 may be disposed along the axial direction of the shaft 100.
- a plurality of protrusions 120 may be disposed along the circumferential direction, but one protrusion 120 may be disposed along the axial direction of the shaft 100.
- a knurling structure for increasing a fixing force between the magnet 200 and the shaft 100 may be applied to a portion of the side surface of the protrusion 120 that does not contact the shaft 100.
- the circumferential separation distance W3 of the protrusion 120 may be greater than or equal to the width W2 of the magnet 200. This is for the magnet 200 to be positioned between the protrusion 120 and the protrusion 120 based on the circumferential direction of the shaft 100.
- the axial separation distance L4 of the protrusion 120 may be less than or equal to the length L2 of the magnet 200. This is for guiding the magnet 200 by at least two protrusions 120 arranged in the same row in the axial direction.
- the length L5 of the protrusion 110 may be greater than 1/2 of the length L2 of the magnet 200. This is the minimum length of the protrusion 120 that can be guided and fixed by the protrusion 120 without the magnet 200 being twisted.
- 19 is a side cross-sectional view of the shaft 100 on which the cover 400 is disposed by being over-molded.
- the cover 400 includes a groove 420 in which the protrusion 120 is disposed. As the protrusion 120 is disposed in the groove 420, the coupling force between the cover 400 and the shaft 100 is increased, and the coupling force between the cover 400 and the magnet 200 is increased.
- FIG. 20 is a diagram illustrating a shaft on which the cover 400 is disposed
- FIG. 21 is a diagram illustrating a state surrounding the cover 400 in a state in which the magnet 200 is disposed on the outer circumferential surface of the shaft 100 .
- the cover 400 may be an adhesive member that wraps the magnet 200 and fixes it to the shaft 100.
- the cover 400 may be a member in which a matrix is impregnated with reinforcing fibers.
- the cover 400 is a member in a semi-cured state and serves as an adhesive sheet for fixing the magnet 200 to the shaft 100.
- the reinforcing fiber may be mainly carbon fiber, glass fiber, aramid fiber, and the like, and the matrix material may be epoxy resin, polyester resin, or thermoplastic resin.
- Carbon fibers are characterized by high tensile strength and tensile modulus as a mechanical property, and excellent in heat resistance and fire resistance as a thermal property.
- Glass fiber is characterized by high tensile strength and tensile modulus as a mechanical property, and a small coefficient of linear expansion as a thermal property. Both carbon fiber and glass fiber have excellent electrical insulation properties.
- the cover 400 may include a first part 410, a second part 420, and a third part 430 divided based on an axial direction.
- the second part 420 extends from one side of the first part 410.
- the third part 430 extends from the other side of the first part 410.
- the first part 410 is a part covering the magnet 200, and the second part 420 and the third part 430 are parts in contact with the shaft 100.
- 22 is a side cross-sectional view of the shaft 100, the magnet 200, and the cover 400.
- the inner surface of the magnet 200 is in contact with the outer surface of the shaft 100. Further, the outer surface of the magnet 200 contacts the inner surface 401 of the first part 410. Some of the inner surface 402 of the second part 420 is in contact with the outer surface of the shaft 100, and the rest of the inner surface 402 of the second part 420 are spaced apart from the outer surface of the shaft 100. A space S1 is formed between the outer surface of the shaft 100 and one end surface of the magnet 200 and the inner surface 402 of the second part 420.
- some of the inner surface 403 of the third part 430 is in contact with the outer surface of the shaft 100, and the rest of the inner surface 403 of the third part 430 is spaced apart from the outer surface of the shaft 100.
- a space S2 is formed between the outer surface of the shaft 100 and the other end surface of the magnet 200 and the inner surface 403 of the third part 430.
- 23 is a plan cross-sectional view of the shaft 100, the magnet 200, and the cover 400.
- the cover 400 may include a plurality of first areas A1.
- the plurality of first regions A1 may be disposed at intervals in the circumferential direction from the axis center.
- the radial distance R1 from the outer surface of the shaft 100 to the first region A1 is the shortest radial distance from the outer surface of the shaft 100 to the outer surface of the magnet 200 Less than (R2).
- the shortest radial distance (R2) from the outer surface of the shaft 100 to the outer surface of the magnet 200 is the side end of the outer surface of the magnet 200 in the circumferential direction when considering the bread shape of the outer surface of the magnet 200 This can be the criterion.
- the first area A1 is disposed between the first unit magnet 200A and the second unit magnet 200B based on the circumferential direction.
- the first region A1 is disposed elongated along the axial direction.
- this first area A1 is separated by the naked eye from the other areas of the cover 400, the arrangement of the magnet 200 can be checked with the naked eye or an image while the cover 400 covers the magnet 200. have. Therefore, the operator can easily check whether there is no problem in the arrangement of the magnet 200.
- 24 is a plan cross-sectional view of the shaft 100 and the magnet 200 showing the second area A2 and the third area A3 of the cover 400.
- the cover 400 may be wound around the shaft 100 to form a double layer.
- the area in which the cover 400 forms a double layer in the radial direction is referred to as a second area A2, and a third area having a thickness t2 different from the thickness t1 of one area in the radial direction at the axis center It is called (A3).
- the cover 400 may include a first layer 400A and a second layer 400B stacked on the first layer 400A in the second region A2.
- first layer 400A and the second layer 400B are illustrated in the drawings, the present invention is not limited thereto, and may be formed of more layers such as a third layer and a fourth layer. Accordingly, the second area A2 may be an area comprising three or more layers.
- FIG. 24 the position of the second area A2 and the position of the third area A3 are illustrated identically, but the present invention is not limited thereto, and the position of the second area A2 and the position of the third area A3 The position of may be different.
- the outer surface of the cover 400 may include a stepped area A4.
- 25 is a diagram illustrating one side edges E1 and E2 of the cover 400 in the second area A2.
- one edge E2 of one layer may be disposed to be inclined to one edge E1 of the other layer.
- the other edge E4 of one layer may be obliquely disposed on the other edge E3 of the other layer.
- FIG. 26 is a perspective view of a shaft including a protrusion
- FIG. 27 is a plan cross-sectional view of the shaft 100 and the magnet 200 including the protrusion.
- the shaft 100 includes a plurality of protrusions 110 in contact with the magnet 200.
- the plurality of protrusions 110 are disposed on the outer peripheral surface of the shaft 100.
- the plurality of protrusions 110 may be spaced apart from each other along the circumferential direction of the shaft 100.
- the plurality of protrusions 110 may be spaced apart from each other along the axial direction X of the shaft 100.
- This protrusion 110 serves to align and fix the magnet 200 disposed on the outer peripheral surface of the shaft 100.
- the protrusion may be formed through an embossing process made on the inside of the hollow shaft 100.
- the protrusion 110 serves to fix the magnet 200 so that it is not twisted while the cover 400 surrounds the magnet 200.
- the protrusion 110 may be disposed to be spaced apart from the cover 400.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims (10)
- 스테이터;상기 스테이터 내측에 배치되는 중공형 샤프트;및상기 샤프트의 외주면에 배치되는 마그넷을 포함하고,상기 샤프트는 상기 마그넷과 접촉하는 복수 개의 돌기를 포함하고,상기 복수 개의 돌기는 상기 샤프트의 외주면에서 돌출된 제1 면과, 상기 샤프트의 내주면에서 오목하게 배치된 제2 면을 포함하는 모터.
- 스테이터;상기 스테이터 내측에 배치되는 중공형 샤프트;및상기 샤프트의 외주면에 배치되는 마그넷을 포함하고,상기 샤프트는 상기 샤프트의 내측과 외측을 관통하는 복수 개의 제2 홀을 포함하고,복수 개의 상기 제2 홀에 각각 배치되며, 적어도 일부가 상기 샤프트의 외주면보다 돌출되어 상기 마그넷과 접촉하는 복수 개의 돌기를 포함하는 모터.
- 제1 항 또는 제2 항에 있어서,상기 복수 개의 돌기는 상기 샤프트의 원주 방향을 따라 이격 배치되고,상기 복수 개의 돌기 간의 원주 방향 이격 거리는 상기 마그넷의 폭보다 크거나 같은 모터.
- 제2 항에 있어서,상기 복수 개의 돌기는 상기 샤프트의 축방향을 따라 이격 배치되고,상기 돌기의 축방향 이격 거리는 상기 마그넷의 길이보다 작거나 같은 모터.
- 제1 항에 있어서,상기 제1 면 및 상기 제2 면은 각각 적어도 하나의 평면을 포함하는 모터.
- 스테이터;상기 스테이터 내측에 배치되는 샤프트;상기 샤프트와 결합하는 마그넷; 및상기 마그넷의 외측에 배치되는 커버를 포함하고,상기 커버는 제1 파트와, 상기 제1 파트의 일측에서 연장되는 제2 파트를 포함하고,상기 마그넷의 내면은 상기 샤프트의 외면과 접촉하고,상기 마그넷의 외면은 상기 제1 파트의 내면과 접촉하고,상기 제2 파트의 내면 중 일부는 상기 샤프트의 외면과 접촉하고, 나머지는 상기 샤프트의 외면과 이격 배치되어, 상기 샤프트의 외면과 상기 제2 파트의 내면 사이에 공간이 배치되는 모터.
- 제6 항에 있어서,상기 커버는 상기 제1 파트의 타측에서 연장되는 제3 파트를 포함하고,상기 제3 파트의 내면 중 일부는 상기 샤프트의 외면과 접촉하고, 나머지는 상기 샤프트의 외면과 이격 배치되어, 상기 샤프트의 외면과 상기 마그넷의 타단면 사이에 공간이 배치되는 모터.
- 제6 항에 있어서,상기 커버는 축중심에서 원주방향으로 간격을 두고 배치되는 복수 개의 제1 영역을 포함하고,상기 샤프트의 외면에서 상기 제1 영역까지의 반경방향 거리는, 상기 샤프트의 외면에서 상기 마그넷의 외면까지의 최단 반경방향 거리보다 작은 모터.
- 제6 항에 있어서,상기 마그넷은 제1 단위 마그넷과 제2 단위 마그넷을 포함하고,상기 제1 영역은 상기 제1 단위 마그넷과 상기 제2 단위 마그넷 사이에 배치되고,상기 제1 영역은 축방향을 따라 배치되는 모터.
- 제6 항에 있어서,상기 커버는 축중심에 반경방향으로 복층을 이루는 제2 영역을 포함하는 모터.
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| US17/595,903 US12249894B2 (en) | 2019-05-28 | 2020-05-28 | Motor |
| JP2021570536A JP7712215B2 (ja) | 2019-05-28 | 2020-05-28 | モーター |
| CN202080039693.9A CN113906656B (zh) | 2019-05-28 | 2020-05-28 | 马达 |
| EP20813535.0A EP3979471B1 (en) | 2019-05-28 | 2020-05-28 | Motor |
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| KR1020190062627A KR102812115B1 (ko) | 2019-05-28 | 2019-05-28 | 모터 |
| KR10-2019-0062627 | 2019-05-28 | ||
| KR1020190160088A KR20210070067A (ko) | 2019-12-04 | 2019-12-04 | 모터 |
| KR10-2019-0160088 | 2019-12-04 |
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| US (1) | US12249894B2 (ko) |
| EP (1) | EP3979471B1 (ko) |
| JP (1) | JP7712215B2 (ko) |
| CN (1) | CN113906656B (ko) |
| WO (1) | WO2020242222A1 (ko) |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3979471A1 (en) | 2022-04-06 |
| JP7712215B2 (ja) | 2025-07-23 |
| EP3979471A4 (en) | 2022-08-03 |
| US12249894B2 (en) | 2025-03-11 |
| US20220231570A1 (en) | 2022-07-21 |
| EP3979471B1 (en) | 2025-11-26 |
| CN113906656B (zh) | 2024-06-28 |
| JP2022535360A (ja) | 2022-08-08 |
| CN113906656A (zh) | 2022-01-07 |
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