JPH07163105A - Switched reluctance motor - Google Patents

Abstract

PURPOSE:To suppress the vibration mode caused by the deformation of stator by canceling the attraction force for distorting the stator inward through a magnetic attraction mechanism comprising a second exciting pole and a second rotor. CONSTITUTION:Attraction force is generated between a rotor 1 and first exciting poles 32a, 32d to cause deformation of a stator 30. Accelerometers 7a, 7b detect the deformation and a controller 100 conducts the exciting coils 38a, 38d of a second exciting pole with a predetermined exciting current depending on a signal value thus exciting second exciting poles 34a, 34d and establishing a magnetic circuit passing through a rotor 20 and the stator 30. Consequently, magnetic attraction force is generated between the second exciting poles 34a, 34d and the second salient poles 22a, 22c of the rotor 20 and acts to cancel the inward displacement at the first exciting poles 32a, 32d caused by the attraction force with respect to the rotor 10. This structure suppresses the vibration mode due to deformation of the stator 30.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional switched reluctance motor, there is, for example, one shown in FIG. This is because the salient poles 4a, 4b, 4
c and 4d are provided, and the stator 1 surrounding the rotor 4 is provided with six exciting magnetic poles 1a, 1b, ..., 1f having coils at equal pitches toward the inside. Two exciting magnetic poles facing each other are connected to each coil as one phase to form a three-phase exciting coil. By sequentially energizing the exciting coils of each phase, the salient poles are attracted to the adjacent exciting magnetic poles and rotated.

[0003]

However, in such a conventional switched reluctance motor, the opposing stator exciting magnetic pole pairs are excited and the magnetic force generated in the exciting magnetic poles causes the rotor 4 to project. Since the structure is such that the poles are attracted to obtain the rotational force, the rotor 4 receives the rotational force and also receives the force in the radial direction. Moreover, this force is generated between the rotor 4 and the stator 1, so that the stator 1 side, which is structurally easy to deform, eventually deforms. In particular,
In order to obtain a large rotational force in the rotor 4, the exciting magnetic pole of the stator 1 is strongly attracted toward the center of the rotor 4 and deforms when a large current is applied to the exciting coil. Further, since this deformation is periodically generated by switching the exciting coil, there is a problem that vibration and noise are generated. Therefore, in view of the conventional problems as described above, it is an object of the present invention to provide a switched reluctance motor that is free from vibration and noise by preventing the stator from being deformed by an attractive force.

[0004]

For this reason, the invention according to claim 1 provides a cylindrical core, a first exciting magnetic pole and a first exciting magnetic pole having a coil wound around the inner peripheral surface and the outer peripheral surface of the core, respectively. A stator having two exciting magnetic poles, a first rotor having salient poles facing the first exciting magnetic pole of the stator, and a second rotor having salient poles facing the second exciting magnetic pole, The first rotor and the second rotor are concentrically coupled to a common output shaft, and the deformation of the stator due to the magnetic attraction force between the first exciting magnetic pole of the stator and the salient poles of the first rotor causes the second exciting magnetic field to be deformed. The switched reluctance motor is configured to be canceled by the magnetic attraction force generated between the pole and the salient pole of the second rotor.

According to a second aspect of the present invention, a cylindrical core is provided,
A stator having a first exciting magnetic pole and a second exciting magnetic pole, each of which has a coil wound around an inner peripheral surface and an outer peripheral surface of the core;
The first rotor is provided with a salient pole facing the first exciting magnetic pole of the stator, and the second rotor is provided with a salient pole facing the second exciting magnetic pole. The first rotor and the second rotor are common. A detection unit that is concentrically connected to the output shaft and that is installed in the stator to detect the deformation of the stator; and the amount of deformation of the stator due to the magnetic attraction force between the first excitation pole of the stator and the salient pole of the first rotor. Accordingly, a control means for exciting the second exciting magnetic pole is provided, and the deformation is offset by the magnetic attraction force generated between the second exciting magnetic pole and the salient pole of the second rotor. It is a switched reluctance motor.

[0006]

According to the first aspect of the present invention, since the second exciting magnetic pole and the second rotor are provided, when the first exciting magnetic pole is excited and the second exciting magnetic pole which is aligned with the second exciting magnetic pole is excited, the stator is removed. A force for attracting inward is generated, and the inward attraction due to the excitation of the first excitation magnetic pole is canceled, and vibration and noise are reduced. Further, according to the second aspect of the present invention, since the deformation of the stator is detected and the control means operates according to the amount of deformation, when necessary,
In addition, the second exciting magnetic pole can be excited by an optimum amount.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. First, the configuration will be described. FIG. 1 is a sectional view along the axial direction showing the configuration of the first embodiment of the present invention. The rotor 10 is connected to the rotor 20 by the connecting portion 25 and is attached to the common output shaft 6 so as to rotate integrally. The output shaft 6 is rotatably supported by a flange 40 as a fixed side and a bearing 9. A stator 30 extends between the rotors 10 and 20 from the flange 40 in a direction parallel to the output shaft 6.

FIG. 2 shows the rotor 1 taken along the line CC of FIG.
It is a sectional view of 0, 20 and a stator 30. Rotor 10
Are provided with four first salient poles 12 at equal pitches. In addition, when showing a specific salient pole among these,
It is represented by 12a, 12b, ... With a subscript. The same applies to the other poles described later.

Six first exciting magnetic poles 32 project at an equal pitch on the inner circumference of a cylindrical stator 30 surrounding the rotor 10, and the end faces of each exciting magnetic pole 32 and the salient poles 12 of the rotor 10 are formed. An air gap 15 is formed between them. A first exciting coil 36 is provided on each of the first exciting magnetic poles 32. On the outer peripheral side of the stator 30, a second exciting magnetic pole 34 is aligned with the first exciting magnetic pole 32 and protrudes outward. Each of the second exciting coils 34 has a second exciting coil 3
8 are provided.

The rotor 2 facing the outer peripheral side of the stator 30
The inner peripheral surface of the second salient pole 2 is aligned with the end surface of the first salient pole 12 of the rotor 10 with the stator 30 sandwiched between the second salient pole 2
2 are provided, and the end surface of each salient pole 22 and the stator 30 are provided.
The air gap 17 is formed at the end face of the second exciting magnetic pole 34. When the first salient poles 12a and 12c of the rotor 10 and the first exciting magnetic poles 32a and 32d of the stator 30 are completely opposed to each other, the second salient poles 22a and 22c of the rotor 20 and the second salient poles 22a and 22c, which are aligned with these, are completely opposed to each other. The exciting magnetic poles 34a and 34d are also arranged to completely face each other.

Accelerometers 7a and 7b are attached to the salient poles 34a and 34b of the stator 30. Accelerometer 7
38a are connected to the control device 100, and the second exciting magnetic poles 38a, 38b, ..., 38f are connected to the control device 100. Note that in FIG. 2, for simplification, the connection wiring with the control device 100 is shown only between the accelerometer 7a and the second exciting coil 38d. Although not shown in FIG. 2 for simplification, in order to increase the strength of the voids sandwiched between the salient poles of the rotor 20, as shown in FIG. Is buried.

In the above structure, the first exciting coil 36
a and 36d are energized to generate the first excitation poles 32a and 32d.
Is excited, a magnetic circuit passing through the rotor 10 and the stator 30 via the first salient poles 12a and 12c is formed.
As a result, the rotor 10 and the first exciting magnetic poles 32a, 32
A suction force is generated between the stator 30 and d and a force is generated in a direction in which the two completely face each other, and the stator 30 is deformed. At this time, the accelerometers 7a and 7b detect the deformation, and the detection signal is input to the control device 100, and in the control device 100, a predetermined exciting current is applied to the first exciting magnetic pole 32 according to the signal value.
Excitation coil 3 of the second excitation pole, which is aligned with a and 32d
8a and 38d are energized to excite the second exciting magnetic poles 34a and 34d. Thereby, the second exciting magnetic poles 34a, 34d
A magnetic circuit passing through the rotor 20 and the stator 30 is formed via the.

In this embodiment, as described above, the magnetic field is generated between the second exciting magnetic pole 34a and the second salient pole 22a of the rotor 20, and between the second exciting magnetic pole 34d and the second salient pole 22c. An attractive force is generated and acts to cancel the inward displacement of the first exciting magnetic poles 32a and 32d due to the attractive force between the rotor 10 and the rotor 10, so that the vibration mode due to the deformation of the stator 30 is reduced. As a result, the size of the motor can be reduced, and the weight reduction can be achieved.

Further, the first protruding toward the rotor 10
In addition to exciting the exciting magnetic pole 32 of the first exciting coil 36 with the first exciting coil 36, the second exciting magnetic pole 34 matching with the exciting magnetic pole 32 is also excited with the second exciting coil 38, so that a rotational torque is generated in the rotor 10. At the same time, a rotational torque is generated in the rotor 20. As a result, there is an advantage that an even larger output torque can be obtained at the output shaft that connects both rotors. In this embodiment, the accelerometer is used to detect the deformation of the stator 30, but the present invention is not limited to this, and the same effect as that of this embodiment can be obtained by using a displacement meter, a speedometer, or the like.

Next, FIG. 4 shows a second embodiment. Output shaft 6
The connecting portion 55 is fixedly connected to the rotor 50A, and the rotors 50A and 50B extend from the connecting portion 55 in both directions along the axial direction thereof. The stators 30A and 30B having flanges are inserted and arranged from both ends of the rotors 50A and 50B. The both flanges rotatably support the rotary shaft 6, and are fixed to the case, respectively. Then, as shown in FIG. 5, the solid line stator 30A and the dotted line stator 30B are shown.
And are arranged so that the angle α is displaced from the rotation center O.

This embodiment is constructed as described above, and the step angle of the rotor is reduced from γ to β. Therefore, in addition to the effect of the first embodiment, torque ripple at the time of starting or low speed rotation is further added. It is possible to obtain the effect that it can be reduced.

[0017]

As described above, according to the present invention, the magnetic attraction mechanism composed of the second exciting magnetic pole and the second rotor, which are aligned with the respective exciting magnetic poles of the stator, is provided to oppose the attractive force that distorts the stator inward. Therefore, the vibration mode due to the stator deformation can be reduced.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line CC of FIG.

FIG. 3 is a diagram showing a relationship between a rotor and a nonmagnetic reinforcing material.

FIG. 4 is a diagram showing a second embodiment.

FIG. 5 is a diagram showing a relationship between stators.

FIG. 6 is a diagram showing a conventional example.

[Explanation of symbols]

 1 rotor 1a, 1b, ..., 1f Excitation magnetic pole 4, 30, 30A, 30B Stator 4a, 4b, ..., 4d Salient pole 6 Output shaft 8 Nonmagnetic material 7a, 7b Accelerometer 10, 20, 50A, 50B Rotor 12th 1 salient pole 22 2nd salient pole 15, 17 Air gap 25, 55 Connecting part 32 1st exciting magnetic pole 34 2nd exciting magnetic pole 36 1st exciting coil 38 2nd exciting coil 40 Flange 100 Control device

Claims (2)

[Claims] 1. A stator having a cylindrical core, a first exciting magnetic pole and a second exciting magnetic pole in which coils are respectively wound around the inner peripheral surface and the outer peripheral surface of the core, and the first stator.
The first rotor has a salient pole facing the exciting magnetic pole and a second rotor having a salient pole facing the second exciting magnetic pole. The first rotor and the second rotor are concentric with a common output shaft. And the deformation of the stator due to the magnetic attraction force between the first exciting magnetic pole of the stator and the salient poles of the first rotor is generated by the magnetic attractive force generated between the second exciting magnetic pole and the salient poles of the second rotor. A switched reluctance motor that is configured to be offset by. 2. A stator having a cylindrical core, a first exciting magnetic pole and a second exciting magnetic pole having a coil wound around the inner peripheral surface and the outer peripheral surface of the core, and the first stator.
A first rotor provided with a salient pole facing the exciting magnetic pole; and a second rotor provided with a salient pole facing the second exciting magnetic pole,
The rotor and the second rotor are concentrically connected to a common output shaft, and are installed in the stator to detect the deformation of the stator, and magnetic attraction between the first excitation pole of the stator and the salient poles of the first rotor. A control means for exciting the second exciting magnetic pole according to the amount of deformation of the stator due to the force, and the deformation is caused by the magnetic attraction force generated between the second exciting magnetic pole and the salient pole of the second rotor. A switched reluctance motor characterized by being configured to cancel each other out.