JP2000037050A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor capable of preventing the winding start section of a coil from floating without the need for troublesome work. SOLUTION: A stator core 32 is formed with a recessed groove into which at least the winding start section 40a of a coil is inserted. The winding start section of the coil is inserted into the recessed groove to be retained, and, when the second layer is wound so as to be overlapped on the top part of the first-layer coil layer, the winding start section is pressed completely by the top-layer coil. Thus, it is possible to prevent the winding start section from lifting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a motor having a stator in which coils are wound around teeth portions of a stator core.

[0002]

2. Description of the Related Art Conventionally, for example, a motor shown in FIG. 4 is known as an example of this kind of motor. In FIG. 4, a pair of bearings 6 and 8 made of oil-impregnated metal bearings are provided in a cylindrical bearing bush 4
Shaft 12 is rotatably supported by the bearing bush 4 via the two bearings 6 and 8. Bearing bush 4
The lower end opening of the shaft 12 is covered with a thrust plate 14, and the lower end of the shaft 12 abuts on the thrust plate 14 to support the shaft 12 in the thrust direction. A thrust washer 16 is fixed to the shaft 12 above the upper bearing 6. A cylindrical rotor magnet 18 is mounted on the inner surface of the cylindrical outer peripheral wall of the rotor 10. A stator 20 facing the rotor magnet 18 via an appropriate gap is fixed to the outer periphery of the bearing bush 4.
In the above configuration, when the coil of the stator 20 is energized, the rotor 10 rotates due to the magnetic interaction between the stator 20 and the rotor magnet 18.

[0003] The stator 20 used in the motor described above.
, As is well known, includes a stator core and a coil wound around a plurality of teeth of the stator core. For example, FIG. 5 shows a stator core 22 of a conventional stator 20. This stator core 22 is formed by stacking a plurality of core plates formed of a ferromagnetic material in an axial direction and performing plastic working such as pack caulking. Are integrated and laminated. The stator core 22 includes a core back 24 serving as an annular core main body and nine teeth 26 projecting radially outward from the core back 24. The teeth 26 are arranged radially, that is, at equal intervals in the circumferential direction. Each tooth 26 includes a tip 26 at the tip and a winding 26 around which a coil is wound.

FIG. 6 shows a stator 2 used in the motor.
0 is a lower perspective view of each tooth 26 of the stator core 22.
Is wound with a three-phase coil 28. Coil 2 for each phase
The end 28a of the winding start portion of No. 8 is soldered onto the substrate 2. The winding of the coil 28 of each phase around the teeth 26 is performed as shown in FIG.
As shown in (1), first, the winding is started from the base side of the winding portion 26b, and the winding is moved to the distal end side of the winding portion 26b while sequentially winding (a → b), and then the coil wound around the winding portion 26b is covered. Move from the distal end side to the base side while winding in order (c
→ d). Then, the coil 28 is wired over the teeth 26 having the same phase as the relevant phase, and wound in the same manner as described above.

[0005]

FIG. 8 is a plan view showing a part of the rotor 10 and the stator 20. As described above, the coil 28 wound around the teeth 26 of the stator 20 is The beginning end 28 a is soldered to the land 30 on the substrate 2. In this case, as understood from FIG. 7, the beginning of winding of the coil 28 (corresponding to the position a) is held down by its upper layer (corresponding to the position d) so that the winding position is maintained. Therefore, it has a structure that cannot be said to be fixed securely. In particular, the coil 28
When the winding operation of (1) is mechanized, there is a large possibility that the pressing of the coil 28 at the start (position a) becomes uncertain.

For this reason, the lead wire (start of winding) of the coil 28 may float due to external factors such as vibration during the operation of the motor. As shown by a broken line in FIG. Thus, there is a problem that noise is generated or an accident such as disconnection of the coil 5 is caused. Here, in order to prevent the coil 28 from floating as described above, it is conceivable to fix the winding start portion using an adhesive, but there is a disadvantage that the workability at the time of assembling the motor is deteriorated.

An object of the present invention is to provide a motor which can completely prevent the above-described lifting of the winding start portion of the coil without any troublesome work.

In order to achieve the above object, a motor according to the present invention comprises a stator, a rotor disposed coaxially with the stator and rotatable relative to the stator, A motor having a rotor magnet attached to the rotor so as to face the stator, wherein the stator includes an annular core body and a plurality of radially arranged teeth protruding from the annular core body; and Wherein the stator core is formed with a concave groove into which at least the winding start portion of the coil is inserted.

Thus, the winding start portion of the coil is inserted and held in the groove, and when the second layer is wound so as to overlap the first coil layer, the winding starts. It is possible to securely hold the beginning with the coil of the upper layer,
Lifting of the winding start portion can be prevented.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a top perspective view of a stator core 32 of the stator in the motor of the first embodiment.

The stator core 32 includes an annular core back 34 serving as a core body and nine teeth 36 projecting radially outward from the core back 34. Each tooth 36 has a tooth tip 36a and a coil. Winding portion 36b to be wound
And formed by subjecting the core plate in a laminated state to pack plastic working in an axial direction at an appropriate position. The nine teeth 36 protruding radially outward are arranged at equal intervals in the circumferential direction, and concave grooves 38 are formed in the axial direction on both side surfaces of the base of the winding portion 36b of each tooth 36. The width of the concave groove 38 is set slightly larger than the coil diameter.

FIG. 2 is a partially enlarged view of a state where coils 40 of each phase are wound around the stator core 32. The winding of the coil 40 in each tooth 36 of the stator core 32 is
First, the winding start portion 40a of the coil 40 is inserted into the groove 38,
As in the conventional case, the coil 40 is wound from the base toward the tooth tip 36a. When it reaches the tooth tip portion 36a, it is folded back and the coil 40 is placed again on the coil 40 of the first layer.
Is wound. At the time of this coil winding, the winding start portion 40a of the coil 40 is inserted into the concave groove 38 and the position is regulated (held), so that a complicated operation by an operator for preventing the winding start portion 40a from floating is prevented. It can be omitted and is very efficient.

As shown in FIG. 2, when the winding of the teeth 36 is completed, the coils 40 of the second and subsequent layers are placed on the winding start portions 40a of the coils 40 inserted into the concave grooves 38.
Are stacked, the winding start portion 40a of the coil 40 is combined with the operation of maintaining the position of the winding start portion 40a in the concave groove 38.
Will be securely fixed.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 3 is an enlarged view of the teeth 36 'in the stator core 32'. In the annular core body 34 'of the stator core 32', the winding start portion 40 of the coil 40 'is located at a position corresponding to each side surface of each tooth 36' protruding radially outward from the core body 34 '.
A concave groove 38 'for holding a' is formed in the axial direction. First, the winding start portion 40a 'of the coil 40' is formed in the groove 3
8 'and then wound as before. FIG.
As is clearer, when the winding is completed,
The winding start portion 40a 'of the concave groove 38' is pushed into the concave groove 38 'by the coil portion adjacent thereto and the coil 40' of the second layer, so that the winding start portion 40a 'is securely fixed. Will be done. As mentioned above, although the specific example of the present invention was explained, the present invention is not limited to these,
Various changes can be made without departing from the spirit of the present invention.
For example, in the above specific example, the concave grooves are formed on both sides of the teeth. However, the same operation and effect as described above can be obtained with a configuration provided on only one side corresponding to the winding start portion of the coil.

【The invention's effect】

As is clear from the above description, the stator of the motor according to the present invention has an annular core body and a stator core having a plurality of teeth protruding from the annular core body and arranged radially. Is formed with a concave groove into which at least the winding start portion of the coil is inserted. As a result, since the winding start portion of the coil is inserted and held in the concave groove, when the second layer is wound so as to overlap the upper portion of the first coil layer, the winding start portion is positioned at the upper coil layer. It is possible to securely press down, and the lifting of the winding start portion can be reliably prevented. Therefore, it is possible to completely prevent the coil winding start portion from being lifted up, without requiring a cumbersome operation such as a conventional coil fixing operation using an adhesive.

[Brief description of the drawings]

FIG. 1 is an upper perspective view showing a stator core body according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of a teeth portion of a stator according to one embodiment of the present invention.

FIG. 3 is an enlarged plan view of a tooth portion of a stator according to another embodiment of the present embodiment.

FIG. 4 is a longitudinal sectional view of a conventional motor.

FIG. 5 is a plan view of a stator core used in a conventional motor.

FIG. 6 is a lower perspective view of a conventional stator.

FIG. 7 is an enlarged plan view of a tooth portion of a conventional stator.

FIG. 8 is a partial plan view of a conventional stator.

[Explanation of symbols]

 32, 32 'Stator core 33, 34' Core back 34, 36 'Teeth 36a, 36a' Tooth tip 36b, 36b 'Winding part 38, 38' Groove 39, 40 'Coil 40a, 40a' Winding start part

Claims (4)

[Claims] 1. A stator, a rotor disposed coaxially with the stator and rotatable relative to the stator,
In a motor having a rotor magnet mounted on the rotor so as to face the stator, the stator includes an annular core body and a stator core including a plurality of teeth arranged protruding from the annular core body and arranged radially. And a coil wound around teeth of the stator core, wherein the stator core is formed with a concave groove into which at least a winding start portion of the coil is inserted. 2. The motor according to claim 1, wherein the concave groove is formed on a base side surface of the tooth protruding from the core body. 3. The motor according to claim 1, wherein the concave groove is formed at a position corresponding to the side surface of the teeth of the core body. 4. The motor according to claim 1, wherein the concave groove is formed at least on a side surface of the tooth corresponding to a winding start portion of the coil.