JPS5835022B2 - Ultra-flat small rotating electric machine and its assembly method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultra-flat compact rotating electric machine, such as an ultra-flat compact motor or generator.

The ultra-flat compact rotating electric machine has a configuration in which the thickness in the axial direction is extremely thin by adopting an arrangement in which a thin rotor and permanent magnets are stacked in the axial direction.

In such a case, the output shaft is very short, so if there is even a slight misalignment in the bearing, the effect will be greatly felt on the outside.

Therefore, when installing bearings, etc., careful attention must be paid to adjusting their eccentricity, etc.

By the way, in this type of rotating electric machine, the output shaft bearing has conventionally been fixed directly to the yoke, but the yoke itself requires position adjustment in order to determine the relationship with permanent magnets, brushes, etc. Coordination was extremely complicated and extremely inefficient.

This invention solves the above-mentioned problems in the conventional system by attaching the bearing of the output shaft to the brush support plate and fixing the brush support plate to the yoke, thereby making it possible to adjust the brush support plate and the yoke separately. The purpose of this invention is to provide a method for assembling an ultra-flat small rotating electric machine that completely eliminates the problem.

Hereinafter, the present invention will be explained in detail with reference to an illustrated embodiment.

1 to 3 show an ultra-flat small motor 1 to which the present invention is applied.

The housing 2 of the motor 1 is constructed by fixing a cylindrical outer frame 4 integral with an upper yoke 3 to a disc-shaped lower yoke 5 by a first fixing means.

In this case, the lower part of the curved surface of the lower yoke 5 is chamfered and knurled 5a, and the lower end periphery of the outer frame 4
a is caulked onto this knurling 5a (
(See Figure 3).

In FIG. 1, an upper bearing 6 is fitted into the center of the upper yoke 3. As shown in FIG.

On the other hand, an elliptical hole 5b (see FIG. 3) is bored in the center of the lower yoke 5 to accommodate a brush or the like.

A circular step 5c for positioning the brush support plate is provided at the center of the lower surface of the lower yoke 5 and has an inner diameter slightly larger than the outer diameter of the brush support plate 8.
Second fixing means i.e. 4 mounting screws? a, 7b, 7c
, 7d (see FIG. 3), a disc-shaped brush support plate 8 is fixed.

The above-mentioned hole 5b is covered by this brush support plate 8.

A lower bearing 9 is fitted into the center of the brush support plate 8, and this bearing 9 is fitted with mounting screws 7a and 7b.
, 7c.

The removal prevention member 10a holds the base portion by 7d.

Removal is prevented by the locking ends of 10b, 10c, and IQd.

Both the bearings 6 and 9 rotatably support the main shaft of the motor 1, that is, the output shaft 11.

Inside the housing 2, an insulating tube 13 is fixed to the thrust bearing through a washer 122 in a portion of the output shaft 11 near the lower bearing 9, and a portion between the insulating tube 13 and the upper bearing 6 is provided with a thrust bearing. , A washer 12b and an isolation ring 14 are fitted to the thrust receiver in order from the top.

A commutator 15 and a rotor support 16 are fitted into the insulating tube 13, and the rotor 1 is fitted into the low-cool support 16.
7 is fixed.

Two permanent magnets 18° 1 are fixed to the upper yoke 3 above the rotor 17 in correspondence with the rotor 17.
9 (see Figure 2) is located.

The brush support plate 8 has two conductive screws 20.2N symmetrically about the axis 11 in the portion corresponding to the hole 5b.
(see Figure 3) are screwed together.

Both screws 20 and 21 are connected to a brush holder 22 made of an elastic conductor, as shown by the screw 21 in FIG.
The base of the brush support plate 8 is fixed to the brush support plate 8, and the brush itself serves as a conductive terminal for external connection.

In FIG. 1, the brush holder 22 is bent upward and then folded back to form a rising portion 22a and a folded portion 22b.
The bases of the brushes 23a, 23b are inserted between the folded portions 22b and the lower ends of the folded portions 22b are inserted into the locking holes drilled in the brush support plate 8, thereby elastically holding the brushes 23a, 23b. keeping.

A brush holder (not shown) fixed to the brush support plate 8 with the other screw 20 also has both brushes 23a,
23b, and these brushes 23a, 23b, etc. are attached to the rotor 17.
Its free end is brought into sliding contact with the circumferential surface of the commutator 15 below.

The commutator 15 has a connection surface 1 with the rotor 17.
5a is the upper surface of the rotor 17, that is, each brush 23a.
, 23b, etc., and is electrically connected to the rotor 17.

Therefore, both conductive screws 20 and 21 are connected to a power source (not shown).
When connected to the brushes 23a and 2, the loco 17
3b etc. and the commutator 15, and the permanent magnet 1
It rotates due to the magnetic relationship with 8°19, and the rotation is outputted by the output shaft.

The brush support plate 8 has an output shaft 11 as described above.
A lower bearing 9 and brushes 23a, 23b, etc. are mounted thereon, and this brush support plate 8 is fixed to the lower yoke 5.

Therefore, when preparing the super flat small motor 1, the brushes 23a, 23b, etc. are first attached to the brush support plate 8.
Attach this brush support plate 8 to the mounting screw 7a.

Temporarily fasten to the lower yoke 5 with 7b, 7c, and 7d.

Next, in order to find the electrical neutral point, the lower yoke 5 is rotated relative to the outer frame 4 or the permanent magnets 18, 19, etc. to adjust the positions of the brushes 23a, 23b, etc., and then,
The lower yoke 5 is fixed to the outer frame 4 by caulking or the like.

Next, by slightly loosening the mounting screws 7a, 7b, 7c, 7d, etc., and slightly moving the brush support plate 8 in the axial direction and perpendicular direction of the output shaft 11, the degree of eccentricity of the lower bearing 9 is adjusted. Adjust your mind.

Thereafter, the brush support plate 8 is fixed to the lower yoke 5 by tightening the mounting screws 7a, 7b, 7c, and 7d.

As described above, in this invention, the output shaft bearing is mounted on the brush support plate, and this brush support plate is attached to the yoke, so that the brush support plate and the yoke can be moved separately.

Therefore, after finding the electrical neutral point of the rotating electric machine and fixing the yoke to the outer frame, the axis of the output shaft can be adjusted by further moving the brush support plate.

As described above, in the present invention, there is no need to simultaneously adjust the electrical neutral point and the axis of the output shaft, unlike conventional rotating electric machines, and the adjustment work is simple.

In addition, the brush support plate is housed in the stepped part of the yoke, and the axial center is adjusted by slightly moving the brush support plate in a direction perpendicular to the output shaft, so the flattening of the rotating electrical machine is not compromised. .

Note that this invention can be applied not only to motors but also to generators, and it is possible to assemble an extremely precise ultra-flat compact rotating electric machine with no eccentricity in the output shaft.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the line II in FIG. 3 of an ultra-flat small motor showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. , Figure 3 is the first
FIG. 3 is a bottom view of the ultra-flat small motor shown in the figure. 4... Outer frame, ta, 5a... First fixing means, 5.
・Lower yoke, 5cm circular step, 7 a + 7 b
, 7 c t7d... Mounting screw (second fixing means), 8... Brush support plate, 9... Lower bearing, 1
7...Rotor.

Claims (1)

[Claims] 1: an outer frame, a yoke that is rotatable with respect to the outer frame, a first fixing means that fixes the yoke and the outer frame, and a brush support that fits the bearing of the output shaft to which the rotor is attached. a brush support plate positioning step provided on the yoke and having an inner circumference slightly larger than the outer circumference of the brush support plate; and second fixing means for fixing the brush support plate to the yoke. In the ultra-flat small rotating electric machine, after rotating the yoke to find an electrical neutral point, the yoke is fixed to the outer frame, and then the brush support plate is fixed in the axial direction of the output shaft. A method of assembling an ultra-flat small rotating electrical machine, characterized in that the brush support plate is assembled by adjusting the axis by slight movement in the vertical direction and fixing the brush support plate to the yoke.