JPS6015430Y2 - small motor - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a small motor with a built-in speed generator.

In the conventional device for a speed generator built into a small motor, the magnetic pole teeth located on the inner peripheral surface of the coil bobbin are bent and formed on the upper and lower yoke plates attached to the upper and lower surfaces of the generator coil bobbin, and each of the upper and lower yoke plates is The magnetic pole teeth are arranged alternately, and the rotating magnet for the generator is opposed to the magnetic pole teeth with a radial gap interposed therebetween.

Therefore, the structure is complicated, and the mounting of the coil bobbin and the upper and lower yoke plates is also complicated.

The present invention has been devised in view of these points, and one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the motor, FIG. 2 is an enlarged sectional view of the main part, and FIG. 3 is a partial perspective view of a rotating magnet for a generator and a yoke plate.

In these figures, 1 is a motor case made of magnetic material, and a lower bracket 2 is integrally formed therein.

The upper opening of the motor case 1 is covered with an upper bracket 3.

A stator field magnet 4 and a power supply brush 5 are attached to the inner surface of the upper bracket.

A rotor 6 is formed by fixing an armature winding body 8 and a commutator 9 to a rotating shaft 7, and the rotating shaft 7 is connected to the upper and lower brackets 2,
It is supported by a pair of bearings 10 and 11 attached to 3.

The lower bracket 2 has a concave stepped portion 12 formed on its inner surface, and a cylindrical portion 13 that protrudes outward (downward) at the center of the concave stepped portion.
is formed by burring.

As shown in FIG. 2, the outer end 14 of the sleeve bearing 11 is press-fitted into the cylindrical portion.

15 is a generator coil bobbin made of resin, and a generator coil 16 is wound around an annular groove on the outer periphery.

The coil bobbin has a central hole 17, which is fitted into a sleeve bearing 11 that protrudes inward from the lower bracket 2.

Reference numeral 18 designates a yoke plate for a generator, and as shown in FIG. 3A, the yoke plate 18 has a large number of teeth 19 projecting in the radial direction on the periphery and a central mounting hole 20.

The central mounting hole is fitted into and fixed to a stepped portion 21 provided at the inner end of the sleeve bearing 11.

In this case, the central mounting hole 20 may be press-fitted into the stepped portion 21, or the yoke plate 18 may be fixed by crimping the inner end of the sleeve bearing 11.

By fixing the yoke plate 18, the coil bobbin 15 is held between the yoke plate 18 and the bottom surface of the recessed step 12 of the lower bracket 2.

22 is a rotating magnet for a generator, and is attached to the lower surface of the armature winding body 8 so as to face the recessed step portion 12.

The rotating magnet is annularly magnetized so that adjacent magnetic poles alternately have different poles, as shown in FIG.

In this case, the magnetic pole pitch P of the rotating magnet 22 is
It is magnetized so that the pitch P' of the teeth 19 degrees 19 is equal to 112 pitches.

In the above generator configuration, the rotating magnet 22 is separated from the north pole via the side wall 23 of the recessed step 12, the bottom wall 24, the yoke plate 18, and the teeth 19 of the yoke plate.
enters the adjacent south pole of.

Since the magnetic flux flows around the generator coil 16 in this manner, a generator output having a frequency corresponding to the rotational speed of the rotor 8 is obtained from the coil.

As described above, according to the configuration of the present invention, by attaching the generator yoke plate to the inner end of the sleeve bearing attached to the center of the bracket, the generator coil bobbin can be inserted between the yoke plate and the bracket. Since the generator is clamped, the structure of the generator stator part is simpler than that of conventional devices, and the yoke plate and the coil bobbin can be easily attached, which has great practical effects.

[Brief explanation of the drawing]

The drawing shows one embodiment of a small motor according to the present invention, and the first
The figure is a sectional view of a small motor, Figure 2 is an enlarged sectional view of the same main part,
FIG. 3 is a partial perspective view of the generator yoke plate and the generator rotating magnet. 1...Motor case, 2...Bracket, 13...Cylinder part, 11...Sleeve bearing, 15...Coil bobbin for generator , 17・
...Central hole, 18...Yoke plate for generator.

Claims (1)

[Scope of utility model registration request] The outer end of the sleeve bearing is inserted and fixed into the cylindrical part provided at the center of the bracket of the motor case, and the center hole of the generator coil bobbin is inserted into the sleeve bearing protruding inwardly of the bracket. A small motor in which a yoke plate is attached to the inner end of the sleeve bearing, and the coil bobbin is clamped and fixed between the bracket and the yoke plate.