JPH0152988B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner rotor type synchronous motor in which a stator is disposed concentrically with a rotor made of permanent magnets, and particularly to a novel structure of the stator.

As a conventional inner rotor type synchronous motor of this type, there is a conveyor roller (motor roller) motor disclosed in Japanese Patent Application Laid-Open No. 122614/1982. Since it has a cantilever support structure, it becomes mechanically unstable, and if the air gap with the rotor is small, there is a risk of it sticking to the rotor, so it is necessary to provide a fairly large air gap, and if this happens, the torque cannot be increased as much. This is inconvenient, and since the length of the magnetic pole pieces cannot be made very long, the motors produced are also short, which is particularly preferable for motors where the driven body is long, such as a motor roller. Nakatsuta.

The present invention was made in view of the above circumstances, and
The purpose of this project is to mechanically stabilize the magnetic pole pieces of the stator by supporting them at both ends, thereby solving the above-mentioned problems with conventional inner rotor type motors, and to achieve this purpose. The gist of the present invention is that the stator includes a pair of strip-shaped magnetic pole pieces made of a high magnetic permeability material that protrude in the axial direction at regular intervals in the circumferential direction from the inner peripheral edge of a collar piece made of a high magnetic permeability material. The squirrel-cage stator members are coaxially inserted into each other so that each magnetic pole piece of one stator member protrudes between adjacent magnetic pole pieces of the other stator member with a constant gap in the circumferential direction, and these magnetic pole pieces are inserted into each other coaxially. A hollow drum-shaped stator body formed by integrally molding a resin insulating layer that continuously covers the outer peripheral surface of the stator body, a winding wound around the body of the stator body, and the stator body. The stator yoke is composed of a plurality of yoke bands arranged to surround the stator yoke, and the engagement hole of each yoke band is engaged with an engagement protrusion protruding from both flange pieces of the stator main body. It is characterized by

An embodiment in which the present invention is applied to a motor roller will be described below with reference to the drawings.

Figure 1 is a vertical cross-sectional view of the motor roller, Figure 2 is
In these figures, 1 is a fixed shaft, 2 is a hollow cylindrical roller body, and roller body side sleeve members 3 and 4 are attached to the inner peripheral surface of both ends of this roller body 2, and the fixed shaft is 1, fixed shaft side sleeve members 5 and 6 are respectively fixed at positions facing the sleeve members 3 and 4, and the roller body side sleeve members 3 and 4 and the fixed shaft side sleeve members 5 and 6 are fixed to each other. Bearings 7 and 8 are interposed between them, and the fixed shaft side sleeve members 5 and 6 are formed relatively thickly.
A plurality of motor wire lead-out holes 9 are provided through the motor wire in the axial direction. 10 is an inner rotor type synchronous motor provided inside the roller body 2, and 11 is a rotation transmission mechanism inside the roller body 2 for transmitting the rotation of the motor 10 to the roller body 2.

The motor 10 includes a pair of left and right rotors 12A, 12B and stators 13A, 13B. The left and right rotors 12A, 12B are fitted with metal support tubes 14A, 14B which are loosely fitted and concentrically fitted around the fixed shaft 1, with both ends remaining on the support tubes 14A, 14B, respectively. roller bodies 15A, 15B made of hollow cylindrical permanent magnets fixed with adhesive; and support tubes 14A, 1.
4B, and are joined to both end surfaces of the roller bodies 15A and 15B, and are rotatably supported on the fixed shaft 1 by bearings 16, 17, 18, and 19. Synthetic resin end support tubes 20A ₁ , 20A ₂ , 20B ₁ ,
20B ₂ , and both rotors 12A, 12B have adjacent end bearing tubes 20A ₂
By abutting the end surfaces of 20B and 20B ₁ and connecting them with an adhesive or the like via a connecting ring 21 inserted inside this abutted portion, they are connected so as to be able to rotate together, and the right end of the rotor 12B is supported. The tube 20B ₂ constitutes a so-called rotor output shaft portion, and a gear 22 for transmitting rotation to the rotation transmission mechanism 11 is formed at its tip.

On the other hand, the left and right stators 13A and 13B have four hollow drum-shaped stator bodies 23A ₁ to 23A ₄ , 23B ₁ to each left and right, which are loosely fitted in series to the rotors 12A and 12B, respectively.
23B ₄ and winding 2 wound around each stator body
4... and four stator bodies 23A ₁ ~
three elongated yoke bands 25a, 25a, 25a, 25b, which are applied to the outer peripheral surfaces of _23A4 , _23B1 to _23B4 and hold them together;
Left and right stator yoke 2 consisting of 25b, 25b
5A and 25B, the left end portions of the left and right stator yokes 25A are fixed to a metal support cylindrical member 26 appropriately fixed to the fixed shaft 1, and the right end portion of the right stator yoke 25B is Rotor 12
The stator yokes 25A and 25B are fixed to a support sleeve 28 which is rotatably supported on the stator yokes 25A and 25B via a bearing 27, and the opposing ends of both stator yokes 25A and 25B are integrally connected to each other by adhesive or the like via a connecting ring 29. They are fixed to support sleeves 30, 30, respectively, and these support sleeves 30, 30 are rotatably supported on rotors 12A, 12B via bearings 31. The above hollow drum type stator body 23A ₁ to 2
3A ₄ , 23B ₁ to 23B ₄ have the same structure, so one stator body 23 will be explained with reference to FIGS. 3 to 5. This stator body 23 is made of a suitable high magnetic permeability material. A cage-shaped stator member in which six strip-shaped magnetic pole pieces 33 similarly made of a high magnetic permeability material are made to integrally protrude in the axial direction at regular intervals in the circumferential direction from the inner peripheral edge of the ring-shaped collar piece 32. 34, and the pair of squirrel cage stator members 34, 34 are arranged such that each magnetic pole piece 33 of one stator member 34 has a constant gap in the circumferential direction between adjacent magnetic pole pieces 33, 33 of the other stator member 34. At the same time, the resin insulating layer 35 is integrally inserted over the gap and outer peripheral surface of the magnetic pole pieces 33 and also over the opposing inner surfaces of the two collar pieces 32, 32. Molded into a hollow drum shape, the magnetic pole pieces 33 are arranged in a cylindrical shape, and the resin insulating layer 35 is formed on the outer peripheral surface or in the gap between the magnetic pole pieces 33.
The body portion of the stator main body 23 is formed by the portions, and the flange portion is formed by each flange piece 32 and the resin insulating layer 35 portion formed on the inner surface thereof.
Note that this resin insulating layer 35 is
3 and the squirrel cage stator member 3.
It has the function of insulating between the cage-shaped stator members 34 and 34 as well as the function of integrally connecting the cage-shaped stator members 34 and 34, and is formed so as to continuously cover at least the outer peripheral surface of the magnetic pole pieces 33... There is a need. On the outer peripheral edge of the flange piece 32 constituting the cage-shaped stator member 34, a pair of engagement protrusions 36, 36 protruding from three locations at regular intervals in the circumferential direction are provided in close proximity to each other. Each pair of engagement protrusions 36, 36 is connected to both squirrel cage stator members 3.
4 and 34 are coaxially inserted into each other so that each magnetic pole piece 33 protrudes at a constant interval in the circumferential direction, and the engaging protrusions 36 and 36 of each pair of the opposing stator member 34 overlap in the axial direction. It is arranged so that you can In addition, each yoke band 25 constituting the stator yokes 25A, 25B
a, 25b are made of suitable high magnetic permeability material to form the stator body 23, as shown in FIG. 2 and further in FIG. 6.
The four stator bodies 23A ₁ to 23A ₄ or 2 are formed to have an arcuate cross section corresponding to the outer peripheral shape of the flange piece 32, and are arranged in series.
One pair of engagement holes _37, 37, 38, 38, 39, 39 are provided at positions corresponding to the engagement protrusion pairs 36, 36 of each collar piece 32 in 3B1 to _23B4 , respectively.
40, 40 and 41, 41 are bored, and in the engagement hole pair 37, ₃₇ of these, for example, a pair of engagement protrusions 36, 36 is engaged with the stator main body 23B ₁ in the engagement hole pair 38, 38.
The pair of engagement protrusions 36, 3 on the right side collar piece 32 in
6 and the pair of engagement protrusions 36, 36 on the left side collar piece 32 of the right-adjacent stator body _23B2 are engaged together in a state in which they overlap each other in the circumferential direction, and the pair of engagement holes 39 are The stator body 23B ₂
The pair of engagement protrusions 36, 3 on the right side collar piece 32 in
6 and a pair of engagement protrusions 36, 36 on the left side collar piece ₃₂ of the stator main body 23B3 on the right side are engaged together with a certain angle deviation in the circumferential direction, and a pair of engagement holes 40, 40 The above stator main body 2
Engagement projection pair 3 on the right side collar piece 32 in 3B ₃
6, 36 and the pair of engagement protrusions 36, 36 on the left side collar piece ₃₂ of the right end stator body _23B4 are engaged together in a circumferentially overlapping state. A pair of engagement protrusions 36, 36 on the right side collar piece 32 are adapted to be engaged with a pair of engagement holes 41, 41. Although only one yoke band 25a or 25b has been described above, each yoke band 25a, 25b
have exactly the same structure, and one set of three yoke bands 25a, 25a, 25a and 25b, 2
5b, 25b are four stator main bodies 23A ₁ to 2
3A ₄ and 23B ₁ to 23B ₄ respectively in the engagement manner described above and in the arrangement state shown in FIG. 2, thereby providing four stator bodies 23A ₁ to 23A ₄ and 23B ₁ respectively ~23B ₄
are interconnected so as not to be movable in the axial direction, circumferential direction and radial direction, and between the left and right stator bodies 23A ₁ , 23A ₂ and 23A ₃ , 23A ₄ , and between the stator bodies 23B ₁ , 23B ₂ and 23B. ₃ and _23B4 , resulting in a phase angle shift. still,
In this case, the stator bodies 23A ₁ , 23A ₂ and the stator bodies 23B ₁ , 23B ₂ are in the same phase, that is, the respective engagement protrusion pairs 36 , 36 overlap on the same straight line, and there is a phase angle between them. Assume that there is no deviation. Also, as shown in Figure 1,
Both ends of each yoke band 25a in the left stator yoke 25A are screw holes 42 (see Fig. 6).
Similarly, both ends of each yoke band 25b in the right stator yoke 25B are fixed to the support sleeves 30 and 28 by screws 43 through screw holes 42. It is fixed. Note that 44 in FIG. 2 indicates an insulating tape applied to the outer surface of each winding 24.

Rotor main body 15 of the rotor 12A, 12B
A, 15B have N poles along the circumferential direction, respectively.
It is magnetized so that 12 magnetic poles such as S pole, N pole, etc. appear, and this rotor body 15
On the outer periphery of A, 15B, stators 13A, 13B
12 stator bodies 23 are inserted alternately in opposing directions and arranged at regular intervals in the circumferential direction.
The magnetic pole pieces 33 of the book are arranged facing each other while maintaining a constant air gap.

Further, stator bodies 23A ₁ to 23A ₄ and 23B ₁ to 23 of the stators 13A and 13B, respectively.
The mutual connection state of each winding 24 wound around _B4 is as shown in the circuit diagram of FIG. still,
In this circuit diagram, 24A ₁ is the stator main body 23
The winding wound on A ₁ , 24A ₂ is the stator body 23
A ₂ is a winding, and 24A ₃ to 24B ₄ are windings corresponding to stator bodies 23A ₃ to 23B ₄ , respectively. Moreover, these windings 24A ₁ to 24A ₄ ,
Leading lines 45a, 45b from 24B ₁ to 24B ₄ ,
45c is pulled out of the roller body 2 through the motor wire lead-out hole 9 of the fixed shaft side sleeve member 5 fixed to one end of the fixed shaft 1, as shown in FIG. 46, a capacitor C is interposed between the lead wires 45a and 45b, and a switch Sw is provided between these lead wires 45a, 45b and another electric wire 45d. The electric wire and the lead wire 45c exit the control box 46 and are connected to the power source. In this case, the lead lines 45a, 4 from the roller body 2 to the control box 46
A connector (not shown) may be interposed between 5b and 45c. In this case, as mentioned above, the stator bodies 23A ₁ , 23A ₂ and 23A ₃ ,
23A ₄ and the stator body 23B ₁ , 23
Since the phase angle is slightly shifted between B ₂ and 23B ₃ and 23B ₄ , due to the phase difference of the current flowing through the windings 24A ₁ and 24A ₂ and the windings 24A ₃ and 24A ₄ ,
Also, the windings 24B ₁ , 24B ₂ and the windings 24B ₃ , 24
A rotating magnetic field is generated by the phase difference between the currents flowing through _B4 , and sufficient starting torque and operating torque can be obtained. Incidentally _{, in this} embodiment, as _is clear from FIG _.
4B ₂ , 24B ₃ , and 24B ₄ are each connected in parallel, but they are connected in parallel only at startup, and during operation, they are switched to series connection to reduce the current during operation. It is also possible to do so.

The rotation transmission mechanism 11 that transmits the rotation of the motor 10 to the roller body 2 includes an end support tube (rotor output shaft portion) 2 connected to one end of the rotor body 15B.
A plurality of planetary gears 47 that can mesh with the outer periphery of the gear 22 formed in _0B2 are arranged at regular intervals in the circumferential direction, and each planetary gear 47 is attached to a support frame fixed to the fixed shaft 1. 48, each planetary gear 47 is meshed with an internal gear 50 formed on the inner peripheral surface of a hollow cylindrical support 49, and one end of this cylindrical support 49 is connected to a sleeve member integral with the roller body 2. Therefore, the rotation of the rotors 12A and 12B is caused by the rotor output shaft 20B ₂ - gear 22 - planetary gear 47 - internal gear 50 - cylindrical support 49 - sleeve. The speed is decelerated and transmitted to the roller body 2 via the member 4.

As explained above, in the inner rotor type synchronous motor of the present invention, the stator has a plurality of strip-shaped magnetic pole pieces made of a high magnetic permeability material at regular intervals in the circumferential direction from the inner peripheral edge of the collar piece made of a high magnetic permeability material. A pair of squirrel cage stator members projecting in the axial direction are coaxially arranged with each other so that each magnetic pole piece of one stator member projects between adjacent magnetic pole pieces of the other stator member with a constant gap in the circumferential direction. In addition to inserting it on top,
A hollow drum-shaped stator body formed by integrally molding a resin insulating layer that continuously covers the outer peripheral surfaces of these magnetic pole pieces, a winding wound around the body of the stator body, and the stator body. a stator yoke consisting of a plurality of yoke bands arranged so as to surround the main body, the engagement holes of each yoke band being engaged with engagement protrusions protruding from both flange pieces of the stator main body; Because of this structure, each magnetic pole piece has a support structure at both ends, making it mechanically stable.Therefore, even if the air gap with the rotor is made sufficiently small, there will be no inconvenience caused by the magnetic pole piece being attracted to the rotor. At the same time, a sufficiently large torque can be obtained, and the axial length of the stator can be increased, making it possible to manufacture a long motor.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view of a motor roller, FIG. 2 is an enlarged sectional view taken along the line - - in FIG. FIG. 4 is an enlarged vertical sectional view of the stator body of FIG. 3, FIG. 5 is a perspective view showing a pair of squirrel cage stator members constituting the stator body, and FIG. The figure is an enlarged perspective view showing a yoke band constituting the stator yoke, and FIG. 7 is an electric circuit diagram. 10...Inner rotor type synchronous motor, 11...
...Rotation transmission mechanism, 12A, 12B...Rotor, 1
3A, 13B...Stator, 15A, 15B...
Rotor body, 23, 23A ₁ ~ 23A ₄ , 23B ₁ ~
23B ₄ ...Hollow drum type stator body, 24,
24A ₁ to 24A ₄ , 24B ₁ to 24B ₄ ...Winding, 2
5a, 25b...Yoke band, 25A, 25B
... Stator yoke, 32 ... Flange piece, 33 ... Strip-shaped magnetic pole piece, 34 ... Squirrel-cage stator member, 35 ...
...Resin insulation layer, 36...Engaging protrusion, 37-41...
...Engagement hole.

Claims (1)

[Claims] 1. In an inner rotor type synchronous motor in which a stator is disposed concentrically with a rotor made of a permanent magnet, the stator has a plurality of magnets made of a high magnetic permeability material starting from the inner peripheral edge of a collar piece made of a high magnetic permeability material. A pair of squirrel-cage-shaped stator members each having strip-shaped magnetic pole pieces projecting in the axial direction at regular intervals in the circumferential direction, each magnetic pole piece of one stator member is spaced between adjacent magnetic pole pieces of the other stator member in the circumferential direction. A hollow drum-shaped stator body is formed by integrally molding a resin insulating layer that continuously covers the outer circumferential surface of these magnetic pole pieces. and a winding wound around the body of the stator body, and a plurality of yoke bands arranged to surround the stator body, and each yoke band's engagement hole is connected to both flange pieces of the stator body. An inner rotor type synchronous motor comprising: a stator yoke engaged with an engaging protrusion protruding from the stator yoke;