JPH0724450B2 - Magnet fixing structure for rotating electrical machines - Google Patents

Description

The present invention relates to an improvement in a magnet fixing structure applied to, for example, a starter motor.

[Conventional technology]

As shown in FIG. 6, the conventional one has four arc-shaped magnets 2a to 2d arranged on the inner circumference of the yoke 1, and the magnets 2a to 2d are placed between these magnets by the force of the four spring members 3a to 3d. There was a thing to fix it to the yoke 1. (For example, Japanese Utility Model Publication No. 49-4650).

[Problems to be solved by the invention]

However, in the above-mentioned conventional one, the four spring members 3a to
Since the forces of 3d are arranged so that they act on each other, even with spring materials that should have been manufactured to the same specifications, for example, due to variations in spring materials, the load on spring materials 3a and 3c is strong,
When the load of the spring material 3b and the spring material 3d is weak, the angle between the center of the magnet 2a and the center of the magnet 2b becomes 90 ° −θ. That is, there is a problem that the four magnets 2a to 2d are not arranged at equal intervals in the circumferential direction. By this,
Due to the imbalance of the magnetic flux distribution due to the magnets 2a to 2d, there are problems such as variations in torque and rotation speed of the rotating electric machine, premature brush wear due to deterioration of commutation, and premature demagnetization below the set current. The greater the number of poles, the greater the effect.

Therefore, in view of the above-mentioned problems of the prior art, the present invention arranges magnets at equal intervals in the inner peripheral direction of the inner periphery of the yoke,
The purpose is to construct a commutating pole with a simple configuration.

[Means for solving problems]

In order to achieve the above object, the present invention has a plurality of protrusions protruding inward from the inner periphery of the yoke and equidistantly arranged in the circumferential direction, and formed in an arc shape and arranged in the circumferential direction. The same number of magnets as the protrusions, each of which is arranged between the two protrusions, and one of the protrusions located on the same direction side in the circumferential direction with respect to each magnet serves as an auxiliary pole. A plurality of magnets arranged such that one end side of the arc is in contact with the one projection, and the magnet is mounted between the other end of the arc of the magnet and the other projection. And an elastic body for fixing between the protrusions.

[Action]

According to the above configuration of the present invention, the plurality of protrusions are provided on the inner circumference of the yoke at equal intervals in the circumferential direction. Further, each of the plurality of arc-shaped magnets is arranged between the two protrusions arranged in the circumferential direction. Further, these magnets are provided with one of the two protrusions located in the circumferential direction so that one of the protrusions located on the same direction side in the circumferential direction with respect to each magnet serves as an auxiliary pole. The arcuate one end side is arranged in contact with the one side. Then, an elastic body is mounted between the other end of the arc of the magnet and the other protrusion, and the magnet is fixed between the two protrusions.

Therefore, according to the configuration of the present invention, the magnets are accurately positioned by the protrusions provided on the inner circumference of the yoke, and the magnets are accurately arranged at equal intervals. Further, in the present invention, the protrusion is used as a compensating pole, and the magnetic flux due to the armature reaction is passed through the protrusion, whereby the magnetic flux is effectively used and the rotating electric machine performance is improved.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. In FIG. 1, reference numeral 1 is a yoke of a motor, and 1a to 1d are four protrusions which are arranged on the inner circumference of the yoke 1 at equal intervals in the circumferential direction. The protrusions 1a to 1d are formed integrally with the yoke 1 by cold glazing. 2a to 2d are four arc-shaped magnets arranged on the inner circumference of the yoke 1 and between the protrusions 1a to 1d, and 3a to 3d are the protrusions 1a to 1d and the magnets.
V for fixing a magnet, which is an elastic body and is arranged between 2a to 2d
It is a letter-shaped leaf spring. The magnet 2a having an arc-shaped cross section is arranged such that one end of the arc 2a of the magnet 2a is brought into contact with the protrusion 1d in order to make the protrusion 1d a complementary pole, and the protrusion 1d is a magnet. It is located on the magnetized side of 2a. Similarly, the magnet 2b contacts the protrusion 1a, the magnet 2c contacts the protrusion 1b, and the magnet 2d contacts the protrusion 1c. And each magnet 2a-2d
From the perspective, the protrusions 1a to 1d are located on the same side with respect to the rotation direction, that is, on the magnetized side. Further, as for the axial positioning of the magnets 2a to 2d, a punch 1e may be provided on the yoke 1 as shown in FIG. 2, or when the leaf springs 3a to 3d are assembled as shown in FIG. A positioning jig 4 composed of a first flat surface portion 4a that comes into contact with the first flat surface portion 4a and a second flat surface portion 4b that comes into contact with the end surfaces of the magnets 2a to 2d may be used.

Then, after positioning the magnets 2a to 2d in the axial direction as described above, the leaf springs 3a to 3d are placed between the protrusions 1a to 1d and the magnets 2a to 2d.
Wear 3d. Then, the spring force of the leaf springs 3a to 3d presses the magnets 2a to 2d against the protrusions 1a to 1d, and the yoke 1
The magnets 2a to 2d are fixed to.

Therefore, the magnets 2a to 2d are pressed against the protrusions 1a to 1d by the leaf springs 3a to 3d regardless of the variation in the spring load of the leaf springs 3a to 3d. Department
Corresponding to the positional relationship of 1a to 1d, since they are arranged at equal intervals in the circumferential direction, output performance, rectification, and demagnetization proof stability can be measured.

Further, the four protrusions 1a to 1d are used as auxiliary poles for the magnets 2a to 2d. By using the auxiliary pole, it is possible to change the shunt winding characteristic to the series winding characteristic to increase the torque in the high current region and increase the rotation in the low current region.

In addition, the protrusions 1a to 1d of the yoke 1 are manufactured by the protrusions 1a to 1d.
It is also possible to punch out the thin body formed by and laminate these thin bodies.

Further, as shown in FIG. 4, even if the protrusions 1a to 1d are separately formed and the protrusions 1a to 1d are fixed to the yoke 1 by using screws 5 from the outer periphery of the hole 1g of the yoke 1. Good.

Then, as shown in FIG. 5, a caulking portion 1f is formed on the outer periphery of the protrusions 1a to 1d, and the caulking portion 1f is formed in the hole 1g of the yoke 1.
Therefore, the protrusions 1a to 1d may be fixed to the inner periphery of the yoke 1 by exposing the outer periphery of the yoke 1 and caulking the caulking portion 1f.

Although the leaf springs 3a to 3d are used as the elastic bodies, other elastic bodies such as rubber, springs and disc springs may be used.

Further, by providing a recess in either one of the end surfaces of the projections 1a to 1d and the end surfaces of the magnets 2a to 2d with which the leaf springs 3a to 3d come into contact, the leaf springs 3a to 3d are provided with the projections 1a to 1d and the magnet 2a to 2d
It is also possible to prevent getting out of the space between and.

Further, the number of magnets may be any number as long as it is plural.

Furthermore, you may use it as a rotating field of a magnet generator.

〔The invention's effect〕

As described above, in the present invention, the plurality of protrusions are provided on the inner circumference of the yoke, and the magnets are fixed by contacting the magnets to the respective protrusions. Can be evenly spaced. Therefore, it is possible to reduce the variation in the magnetic flux distribution due to the magnet.

Further, in the present invention, since the protrusions are used not only for positioning the magnets but also as auxiliary poles for each magnet, the magnetic fluxes can be effectively utilized by these protrusions.

As described above, according to the present invention, the magnet can be accurately positioned in the yoke, the supplementary pole can be provided with a simple structure, the variation in the magnetic flux distribution can be reduced, and the magnetic flux can be effectively used. There is an excellent effect that performance can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a magnet fixing structure for a rotating electric machine according to the present invention, FIGS. 2 and 3 are half cross-sectional views showing states of positioning of magnets, and FIGS. 4 and 5 are respectively. FIG. 6 is a cross-sectional view showing a main part of a fixing structure for a protrusion in a magnet fixing structure for a rotating electric machine of the present invention, and FIG. 6 is a front view showing a magnet fixing structure for a conventional rotating electric machine. 1 ... Yoke, 1a-1d ... Projection, 2a-2d ... Magnet, 3a-3
d …… A leaf spring that is an elastic body.

Claims (1)

[Claims] 1. A plurality of protrusions projecting on the inner periphery of a yoke and provided at equal intervals in the circumferential direction, and between two protrusions formed in an arc shape and arranged in the circumferential direction. The same number of magnets as that of the protrusions, each of which is arranged on the same direction side in the circumferential direction with respect to each of the magnets so that one of the protrusions serves as an auxiliary pole. A plurality of magnets arranged so that one end side of the arc shape abuts on the protrusion, and the magnet is mounted between the other end side of the arc shape of the magnet and the other protrusion section, and the magnet is placed between the protrusion sections. A magnet fixing structure for a rotating electric machine, comprising: