JP2644940B2 - Rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stepping motor,
The present invention relates to a rotating electric machine such as a DC motor.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a stepping motor as a kind of a conventional rotating electric machine. In this stepping motor, a pair of slot insulators 2 and 3 are fitted into an annular stator core 1 having a plurality of salient poles on the inner peripheral side from both sides in the axial direction. The windings 4 are wound around the salient pole portions via the slot insulators 2 and 3, and the lead wires 5 from the respective windings 4 are locked by the lead wire locking portions 6 provided on one of the slot insulators 2. I have. Aluminum end brackets 7 and 8 are fixed to both ends of the stator core 1 in the axial direction. The end brackets 7 and 8 are provided with bearing holding portions 7a and 8a, respectively. The bearing holding portions 7a and 8a have a pair of bearings 9 and 8, respectively.
10 are held. The rotating shaft 12 of the rotor 11 is supported by the pair of bearings 9 and 10.

[0003]

As in the case of the stepping motor shown in FIG. 3, in a conventional rotating electric machine, bearing holders 7a and 8a for supporting bearings for supporting a rotating shaft of a rotor are provided with end brackets 7 and 8. Therefore, there is a limit in reducing the thickness of the rotating electric machine in the axial direction. However, in recent years, there has been an increasing demand for further reducing the thickness of the rotating electric machine in the axial direction.

An object of the present invention is to provide a rotating electric machine that can reduce the thickness of the rotating electric machine in the axial direction.

[0005]

According to the present invention, a winding is provided via a slot insulator to a salient pole portion of a stator core having a plurality of salient pole portions on an inner peripheral side and having a slot insulator inserted from an axial direction. A rotating electric machine including a wound stator, a pair of bearings supported by a pair of bearing holding portions provided on the stator side, and a rotor having a rotating shaft supported by the pair of bearings. For this purpose, one of the pair of bearing holding portions is provided in the slot insulator. The bearing holding portion can be provided integrally with the slot insulator. In order to increase the positioning accuracy of the bearing, a bearing surface is provided with a contact surface that is pressed against the magnetic pole surfaces of the plurality of salient pole portions of the stator core, and the bearing holding portion is provided in a rotating space surrounded by the magnetic pole surfaces. It is preferable to press-fit a part.

[0006]

The person skilled in the art has a stereotype that the slot insulator is used to secure insulation between the stator core and the winding conductor. The inventor breaks this fixed idea and provides the slot insulator with the bearing holding portion, so that one end bracket is not required as compared with the structure of the conventional rotating electric machine, and the axial dimension of the rotating electric machine is shortened accordingly. . When the bearing holding portion is provided integrally with the slot insulator, the number of components is reduced and the bearing holding portion can be firmly positioned. When the bearing holding portion is provided with a contact surface that is pressed against the magnetic pole surface of the salient pole portion of the stator core,
The axis of the bearing holding portion (the axis of the bearing) can be reliably matched with the axis of the stator core.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1A is a longitudinal sectional view of an embodiment in which the present invention is applied to a stepping motor, and FIG.
It is the left view of the motor seen on the basis of (A). In the figure, reference numeral 101 denotes a plurality of salient pole portions 101a to 101 on the inner peripheral side.
1H, the stator core 101 has an inner peripheral surface having an octagonal contour, and each salient pole portion 101a to 101h It protrudes radially inward from the peripheral surface. Four through-holes 101A are formed at four corners of the stator core 101, and a tightening screw 113 is inserted into each of the four through-holes. A pair of slot insulators 102 and 103 are fitted into the stator core 101 from both sides in the axial direction. These slot insulators 102, 103
Are integrally formed of an insulating resin. A winding 104 is wound around each salient pole portion via slot insulators 102 and 103, and although not shown, each winding 1
04 is one slot insulator 1
02 is locked by the lead wire locking portion 106 provided on the wire. An end bracket 107 made of aluminum is provided at one end of the stator core 101 in the axial direction with the above-mentioned tightening screw 113.
It is fixed by. One bearing 109 composed of a ball bearing is fitted and held in the bearing holding portion 107a of the end bracket 107. The slot insulator 102 is also provided with a bearing holding portion, and the other bearing 110 is held by the bearing holding portion. Rotor 1
Reference numeral 11 denotes a pair of cup-shaped members 111a and 111b made of a magnetic material and having a plurality of pole teeth formed on the outer periphery, and an annular permanent magnet 111c sandwiched between the cup-shaped members 111a and 111b. . 115 is the rotor 1
11 is a spring washer for biasing 11 in the axial direction,
116 is an annular washer.

FIGS. 2A and 2B are a vertical sectional view and a right side view of the slot insulator 102. FIG. On the inner peripheral side of the octagonal contour frame 102A of the slot insulator 102, end face covers 102a1 to 102h1 that cover axial end faces of the salient pole parts 101a to 101h of the stator core 101 project radially inward. Is formed on the inner peripheral side of the contour frame 102A so as to extend in the axial direction (rightward in the drawing) so as to surround each slot formed between two adjacent salient pole portions. Slot covers 102a2 to 102
h2 is provided. End face cover parts 102a1-10
The protruding portions 102a3 to 102a
2h3 is provided integrally. Each projection 102a3 ~
Guide grooves 102B for guiding the winding conductor are formed between 102h3. And each protrusion 1
02a3 to 102h3 in the radially outer portion, the magnetic pole faces 10a of the salient pole portions 101a to 101h of the stator core 101 are formed.
1a1 to 101h1 [Note that FIG.
Only 1a1 and 101f1 are shown. Are formed on the inner surface of each of the protrusions 102a3 to 102h3 in the radial direction, and a cross section for fitting and holding a bearing 110 formed of a ball bearing. L-shaped step 102a5
~ 102h5 are formed. In this embodiment,
A bearing holding portion for holding the bearing 110 is constituted by 102a3 to 102h3. The structure of the slot insulator 103 on the other side has substantially the same shape as the shape of the slot insulator 102 except for the protrusions 102a3 to 102h3 and the lead wire locking portion 106.

When assembling the stepping motor, first, slot insulators 102 and 103 are fitted on both sides of a stator core 101, and a winding 104 is wound through the slot insulators 102 and 103. Next, the bearing 109 is fitted to the end bracket 107, and the bearing 110 is fitted to the slot insulator 102. Then, one end of the rotating shaft 112 of the rotor 111 is supported by the bearing 110, and then the end bracket 107 is supported by the bearing 109 of the end bracket 107 while supporting the rotating shaft 112.
Is attached to the stator core 101, and is attached to the stator core using the mounting screws 113, thereby completing the assembly.

In the above embodiment, the bearing holding portions are formed by providing the projections 102a3 to 102h3 on all of the end face covers 102a1 to 102h1 of the slot insulator 102. However, the projections are provided on all of the end face covers. There is no need to provide a sufficient number of protrusions in a range that can hold the bearing. In the above embodiment, the slot insulator 102 having the bearing holding portion is
However, it is needless to say that the slot insulator 102 may be provided on the protruding portion side of the rotating shaft 112. Further, in the above embodiment, the protrusions 102a3 to 102a1
Although the bearing holding portion made of 02h3 is provided integrally with the slot insulator 102, the bearing holding portion does not necessarily have to be provided integrally with the slot insulator 102, and the bearing holding portion manufactured as a separate component is fixed to the slot insulator 102. It may be. In the above embodiment, a pair of slot insulators 102 and 103 is used. However, when only one slot insulator is used, a bearing holding portion is provided on one slot insulator. Further, the above embodiment is an example in which the present invention is applied to a stepping motor. However, it is needless to say that the present invention can be applied to other rotating electric machines such as a DC motor, a servomotor and a resolver.

Further, according to the above embodiment, the protruding portions 102a3 to 102h3 constituting the bearing holding portion are provided with the contact surfaces 102a4 to 102h4 which are pressed against the magnetic pole surfaces of the stator core, and the shaft core ( The shaft core of the bearing coincides with the shaft core of the stator core, but a fitting hole or a groove is provided on the end face of the stator core 101, and a fitting projection is provided on the protrusions 102a3 to 102h3 of the slot insulator. The positioning accuracy may be increased by performing the above operation.

[0012]

According to the first aspect of the invention, since the slot insulator is provided with the bearing holding portion, one end bracket is not required as compared with the structure of the conventional rotary electric machine.
There is an advantage that the dimension of the rotating electric machine in the axial direction is shortened accordingly. In particular, pressure is applied to the magnetic pole surface of the salient pole of the stator core in the bearing holder.
Since the contact surface to be contacted is provided, the shaft center (bearing
Axis of the stator) and the axis of the stator core
There are advantages that can be done. According to the second aspect of the invention, the number of parts can be reduced, and the bearing holding portion can be firmly positioned.

[Brief description of the drawings]

1A is a longitudinal sectional view of an embodiment in which the present invention is applied to a stepping motor [sectional view taken along line AA in FIG. 1B], and FIG. 1B is based on FIG. FIG. 5 is a left side view of the motor as viewed from above.

FIGS. 2A and 2B are a vertical sectional view and a right side view of the slot insulator.

FIG. 3 is a longitudinal sectional view of a conventional stepping motor.

[Explanation of symbols]

1, 101: stator core, 2, 3, 102, 103: slot insulator, 4, 104: winding, 5: lead wire, 6, 106: lead wire locking portion, 7, 8, 107: end bracket, 9, 10, 109, 110 ... bearing, 1
1,111 ... rotor, 12,112 ... rotary axis.

Claims (2)

(57) [Claims] 1. A stator having a plurality of salient pole portions on an inner peripheral side and a winding wound around said salient pole portions of a stator core in which a slot insulator is inserted from an axial direction via said slot insulator. And a pair of bearings supported by a pair of bearing support portions provided on the stator side, and a rotor having a rotating shaft supported by the pair of bearings. One of the bearing holding portions is provided in the slot insulator, and the bearing holding portion is formed of the plurality of salient pole portions of the stator core.
Having a contact surface pressed against the magnetic pole surface,
A rotating electric machine characterized in that a part is press-fitted into an enclosed rotating space . 2. The rotating electric machine according to claim 1, wherein the bearing holding portion is provided integrally with the slot insulator.