JPS62107664A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To readily position at an accurate angle between a magnet and a brush by forming a connector at magnet clamping fittings for securing the magnet, and positioning the positioner of a brush holder by the connector. CONSTITUTION:Arcuate magnets 2 are disposed at an equal interval circumferentially on the inner periphery of a cylindrical yoke 1. Clamping fittings are formed of a bottom 3a secured to the inner periphery of the yoke 1 between adjacent magnets 2, and a pair of sides 3b bent to the inner peripheral side from the bottom 3a. A connector 3c bent perpendicularly to the magnet 2 side is integrally formed at the ends of the pair of sides 3b, and a projection 3d which forms a connector projected axially from the end face of the bottom 3a is formed. The projection 3d is inserted into the hole 11a of a brush holder plate 11 to set the angle of the brush 10 to the magnet 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to, for example, fixing a permanent magnet and a brush holder used for excitation of a rotating electrical machine such as an electric motor.

[Conventional technology]

In the conventional type, a magnet is fixed to the inner circumference of the yoke, and
A magnet cover was placed in contact with the inner circumferential side of the magnet to prevent pieces of the magnet from coming out of the magnet cover even if the magnet were chipped or cracked. (For example, Japanese Unexamined Patent Publication No. 56-56158) [Problems to be solved by the invention] However, in the above-mentioned conventional method, the relative angle (electrical angle) between the magnet and the brush is set at a predetermined angle. When doing so, it is necessary to position the yoke and the magnetic cover, between the brush holder that holds the brush and the bracket that fixes this brush holder, and between the yoke and the bracket. There is a problem in that the number of man-hours and marks for positioning increase, and errors occur during each positioning, making it impossible to accurately set the final angle between the magnet and the brush.

In consideration of the above-mentioned conventional problems, the present invention is designed to facilitate accurate positioning of the angle between the magnet and the brush.

[Means for solving problems]

A plurality of arc-shaped magnets arranged on the inner periphery of a cylindrical yoke, an armature arranged on the inner periphery of these magnets, a brush that supplies current to this armature, and a brush that holds this brush. a brush holding device having a gel determining portion; a side portion disposed between the magnets and fixed to the inner periphery of the yoke and pressing a circumferential end surface of the magnet; and a positioning portion of the brush holding device. A rotating electric machine is provided with a substantially U-shaped magnetic stopper having an engaging portion that engages with the brush holding device to position the brush holding device.

[Effect]

An engaging part is formed on the magnet stopper for fixing the magnet, and this engaging part performs positioning with the positioning part of the brush holding device, and this positioning sets a predetermined angle between the brush and the magnet. It is carried out.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 1, 1 is a cylindrical yoke, and on the inner periphery of this yoke 1, two arc-shaped magnets 2 are arranged at equal intervals in the circumferential direction.
One is placed.

3 is a magnet stop made of an elastic material, and FIG. 2 is a perspective view of the magnet stop 3.

This stopper 3 is U-shaped and consists of a bottom part 3a fixed to the inner circumference of the yoke 1 between adjacent magnets 2 by welding or the like, and a pair of side parts 3b bent inward from the bottom part 3a. be. A locking part 3C bent at right angles to the magnet 2 side is integrally formed on the end face of the pair of side parts 3b, and a locking part 3C is formed integrally with the end face of the bottom part 3a (the side opposite to the locking part 3b) in the axial direction. A protrusion 3d serving as a protruding engagement portion is provided.

Two magnet stops 3 are fixed at opposing positions on the inner circumference of the yoke 1. Then, the magnet 2 is placed between the side surfaces 3b of the magnet stopper 3.
is inserted, and the axial movement of the magnet 2 is performed by the locking portion 3C. Further, the magnet 2 is fixed to the inner circumference of the yoke 1 by the elastic force that tends to spread toward the outer circumference of the side surface portion 3b of the stopper 3, and the side surface of the magnet 2 is pressed.

4 is an armature arranged on the inner circumference of the magnet 2, 5 is a commutator, 6
is a shaft passing through the center of the armature 4.

Reference numerals 7.8 denote a front bracket and a rear bracket that are respectively fitted to the end faces of the yoke 1, and both brackets 7.8 are fixed to the yoke 1 with through bolts (not shown). Then, with the bearing 9 provided on the inner circumference of the bracket 7°8,
The shaft 6 of the armature 4 is rotatably supported.

As shown in FIG. 3, 10 is a brush that slides on the commutator 5, and this brush 10 is connected to the brush holder plate 11.
It is housed in a brush holder 12 fixed above. Further, 13 is a brush spring for pressing the brush 10. Furthermore, 14 is a pigtail of the brush 10, the tenth big tail is connected to the input terminal 15 on the battery side, and the minus side pigtail is connected to the brush holder plate 11 and grounded. Also, brush holder plate 1
A hole 11a is formed on the outer peripheral side of the stopper 1 and serves as a positioning portion into which the protrusion 3d of the stopper 3 is inserted. and,
These holes 11a are formed so that when the projection 3d of the stopper 3 is inserted, the angle (electrical angle) of the brush 10 with respect to the magnet 2 becomes a predetermined angle.

In addition, a magnet 2 is placed on the outer circumferential side of the brush holder plate 11.
Four tongues 11b bent in the axial direction are formed at positions facing the end surface 2a.

Then, insert the hole 11a of the brush holder plate 11 into the protrusion 3d of the stopper 3, and
1 in the circumferential direction, the stepped portion 1a of the yoke I,
A brush holder plate 11 is sandwiched between and fixed to the stepped portion 8a of the rear bracket 8. At this time, the end surface of the tongue portion 11b provided on the brush holder plate 11 comes into contact with the end surface 2a of the magnet 2, and the magnet 2 ensures axial movement between the tongue portion 11b and the locking portion 3C of the stopper 3. to be regulated.

Further, the tongue portion 11b has an elastic force, and this elastic force can absorb the clearance between the end face 2a of the magnet 2 and the brush holder plate 11 during assembly.

As described above, by inserting the hole 11a of the brush holder plate 11 into the protrusion 3d formed on the magnet stopper 3, the angle (electrical angle) of the brush 10 with respect to the magnet 2 can be set. Therefore, the number of man-hours for positioning can be reduced, and the angle can be set accurately only by positioning between the stopper 3 and the brush holder plate 11.

The stopper 3 and the brush holder plate 11 are only fitted together, but as shown in FIG. The brush holder plate 11 may be elastically fitted into the hole 11a of the brush holder plate 11. That is, the brush holder plate 11 is between the bent part 3e and the end face of the bottom part 3a or the side part 3b,
Movement is restricted in the axial direction.

Further, the brush holder plate 11 is fixed between the yoke 1 and the rear frame 8, but after inserting the projection 3d of the stopper 3 into the hole 11a of the brush holder plate 11, The brush holder plate 11 may be fixed to the stopper 3 by bending or by using the structure shown in FIG.

〔Effect of the invention〕

As described above, in the present invention, the engaging portions are formed on the stops that arrange and fix the magnets at approximately equal intervals in the circumferential direction,
Since positioning in the circumferential direction is performed by this engaging part and the positioning part of the brush holding device that holds the brush, it is possible to reduce the number of man-hours for positioning by only positioning the magnetic stopper and the brush holding device. An excellent effect is that the relative angle between the magnet and the magnet can be set accurately.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the rotating electrical machine of the present invention, FIG. 2 is a front view showing a state in which the end frame in FIG. 1 is omitted, and FIG. 3 is a perspective view showing a magnetic stopper. FIG. 4 is a perspective view showing another embodiment of the magnetic stopper. l... Yoke, 2... Magnet, 3... Magnet stopper,
3a... Bottom part, 3b... Side part, 3d... Protrusion part forming an engaging part, 10... Brush, 11... Brush holder plate 11a... Hole part forming a positioning part.

Claims (2)

[Claims] (1) A plurality of arc-shaped magnets placed on the inner periphery of a cylindrical yoke, an armature placed on the inner periphery of these magnets, a brush that supplies current to this armature, and this brush. a brush holding device having a positioning portion; a side portion disposed between the magnets, fixed to the inner periphery of the yoke, and pressing a circumferential end surface of the magnet; A rotating electric machine comprising: a substantially U-shaped magnetic stopper having an engaging portion that engages with the brush holding device and positions the brush holding device. (2) The magnet stopper is characterized in that a locking portion that restricts movement of the magnet in the axial direction is formed integrally bent toward the magnet. The rotating electric machine described.