JPH05268751A - Reluctance motor - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce vibration and noise of reluctance motors. A second exciting magnetic pole 26 is provided on the outer peripheral side of the stator 20 so as to be aligned with the first exciting magnetic pole 22, and is excited by a second exciting coil 28. The inner circumference of the support portion 30 has a second
The second salient pole 32 is provided so as to face the exciting magnetic pole with an air gap 36. When the second exciting magnetic pole, which is matched with the first exciting magnetic pole when it is excited, is excited, the second exciting magnetic pole is excited.
Attracting force is generated between the exciting magnetic pole and the second salient pole of the rotor 1.
The inward displacement of the portion of the first exciting magnetic pole 22 due to the attraction force between 0 and 0 is canceled and the vibration mode is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved reluctance motor structure.

[0002]

2. Description of the Related Art As a conventional reluctance motor, there is, for example, one disclosed in Japanese Patent Laid-Open No. 2-307391. In this example, as shown in FIG. 3, the rotor 1 is provided with eight salient poles 2a, 2b, ..., 2h at an equal pitch, and the stator 3 surrounding the rotor 1 is provided with six exciting magnetic poles 4a having exciting coils. 4b, ..., 4f are provided inwardly at equal pitches. By the phase-controlled energization of the exciting coil,
The salient poles are attracted to the adjacent exciting magnetic poles and driven to rotate.

[0003]

However, in such a conventional reluctance motor, the stator 3 is used.
When the exciting magnetic poles, such as 4a and 4d, are excited, the attractive force between these exciting magnetic poles and the salient poles (2a and 2e in the figure) of the rotor 1 facing each other causes the stator to move as shown by 3'in FIG. Is transformed. Since this deformation occurs periodically with the rotation, there is a problem that vibration and noise are likely to occur. Therefore, in view of the above-mentioned conventional problems, it is an object of the present invention to provide a reluctance motor that is free from vibration and noise by preventing the stator from being deformed by an attractive force.

[0004]

Therefore, the present invention provides a reluctance motor having salient poles provided on a rotor and a first excitation magnetic pole provided on a stator and having a first excitation coil. A magnetic attraction mechanism is provided in alignment with the excitation magnetic pole, and the magnetic attraction mechanism includes a fixed-side support portion and a second excitation magnetic pole formed on either the support portion or the stator and including a second excitation coil. Deformation of the stator due to the magnetic attraction force between the first excitation magnetic pole and the salient pole is offset by the magnetic attraction force generated between the support portion and the stator by driving the second excitation coil. The reluctance motor is configured as described above.

[0005]

Since the magnetic attraction mechanism having the supporting portion and the second exciting magnetic pole is provided, when the first exciting magnetic pole is excited and the second exciting magnetic pole which is aligned with the magnetic excitation mechanism is excited, the first exciting magnetic pole is excited. A force for attracting the exciting magnetic pole portion to the outside of the support portion is generated, and the rotor 1
The inward displacement of the first exciting magnetic pole portion due to the attraction force between 0 and 0 is canceled and the vibration mode is reduced.

[0006]

FIG. 1 shows an embodiment of the present invention. Rotor 1
Four first salient poles 12 are provided at 0 at an equal pitch. In addition, when showing a specific salient pole among these,
They are represented by subscripts 12a, 12b, ... The same applies to the other poles described below. The first exciting magnetic pole 22 is formed on the inner circumference of the ferromagnetic ring-shaped stator 20 surrounding the rotor 10.
The protrusions are formed at an equal pitch, and an air gap 16 is formed between the end surface of each exciting magnetic pole 22 and the end surface of the first salient pole 12 of the rotor. A first exciting coil 24 is provided in each of the first exciting magnetic poles 22. On the outer peripheral side of the stator 20, a second exciting magnetic pole 26 is aligned with the first exciting magnetic pole 22 and protrudes outward. The second exciting magnetic pole 26 is the second
It is excited by the exciting coil 28.

On the outer peripheral side of the stator 20, a ring-shaped fixed side support portion 30 made of the same material as the stator is provided, and forms a double ring together with the stator 20. Stator 20
The support portion 30 and the support portion 30 are connected by a bridge 34 between the second excitation magnetic poles 26. A second salient pole 32 is provided on the inner periphery of the support portion 30 so as to face the end face of the second exciting magnetic pole 26 with an air gap 36. The number of the first salient poles 12 of the rotor and the number of the first exciting magnetic poles 22 of the stator are different, and when the salient poles 12a and the exciting magnetic poles 22a are completely opposed to each other, the salient poles 12c and the exciting poles 12c opposite to each other are excited. The poles 22d are also completely opposed.

With the above-described configuration, in operation control, the first exciting coils 24a and 24d are energized to excite the first exciting magnetic poles 22a and 22d, and as shown in FIG. A magnetic circuit Ji passing through the rotor 10 and the stator 20 is formed via the first salient poles 12a and 12c. As a result, an attractive force is generated between the rotor 10 and the first excitation magnetic poles 22a and 22d, and torque is generated in the direction in which the two are completely opposed to each other. At the same time, by energizing the exciting coils 28a and 28d of the second exciting magnetic poles that match the first exciting magnetic poles 22a and 22d,
When the second excitation magnetic poles 26a and 26d are excited, the stator 20 and the bridge 3 are connected via the second salient poles 32a and 32d.
4, a magnetic circuit Jo passing through the support 30 is formed.

As a result, between the second exciting pole 26a and the second salient pole 32a, between the second exciting pole 26d and the second salient pole 32.
An attractive force is generated during each of d and acts so as to cancel the inward displacement of the first excitation magnetic poles 22a and 22d due to the attractive force between the rotor 10 and the rotor 10. As a result, the effect that the vibration mode due to the attractive force between the salient pole and the exciting magnetic pole between the rotor and the stator is reduced can be obtained.

Here, the second salient pole 32 of the support portion 30
a, 32d to the second exciting magnetic poles 26a, 2 of the stator
An inward suction force is applied from 6d, but the stator 20 and the support portion 30 are connected to each other by the second
Between the salient poles 32a, 32d of the
Since it is rigidly connected by, the strain strength is very high.
Therefore, the generation of vibration due to the attraction force on the second salient pole 32 is at a level that can be ignored.

Further, the first portion protruding toward the rotor 10
In addition to exciting the exciting magnetic pole 22 of No. 1 by the first exciting coil 24, the second exciting magnetic pole 26 matching with these is also excited by the second exciting coil 28, resulting in a strong magnetic flux that cannot be obtained by the conventional technique. However, there is an advantage that a larger output torque can be obtained. Further, the space surrounded by the stator 20 and the support portion 30 is completely isolated from the rotor,
By passing the cooling medium through this, there is a feature that an efficient motor cooling structure can be obtained without causing a rotational energy loss.

As described above, according to the present invention, the magnetic attraction mechanism aligned with each exciting magnetic pole of the stator is provided so as to counteract the attraction force that distorts the stator inwardly to cancel it. The effect that the mode is reduced is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a magnetic circuit generated in the embodiment.

FIG. 3 is a diagram showing a conventional example.

FIG. 4 is an explanatory diagram of a vibration mode in a conventional example.

[Explanation of symbols]

 1 rotor 2a, 2b, ..., 2h salient pole 3 stators 4a, 4b, ..., 4f exciting magnetic pole 10 rotor 12 first salient pole 16,36 air gap 20 stator 22 first exciting magnetic pole 24 first exciting coil 26 Second excitation pole 28 Second excitation coil 30 Support portion 32 Second salient pole 34 Bridge

Claims (1)

[Claims] 1. In a reluctance motor having salient poles provided on a rotor and a first exciting magnetic pole provided on a stator and having a first exciting coil, a magnetic attraction mechanism is aligned with the first exciting magnetic pole. The magnetic attraction mechanism includes a fixed-side support portion and a second excitation magnetic pole that is formed on either the support portion or the stator and that includes a second excitation coil. The deformation of the stator due to the magnetic attraction force between the salient poles is offset by the magnetic attraction force generated between the support portion and the stator by driving the second excitation coil. Reluctance motor.