JPH05292716A - Reluctance motor - Google Patents

Abstract

PURPOSE:To increase an output torqu without increasing a torque ripple. CONSTITUTION:A reluctance motor has a ringlike stator yoke 1, a stator 1 which has a plurality of exciting poles 12A, 12B,... protruding inward in the yoke 1 and coils 3 wound thereon, and a rotor 2 which has salient poles 21, and comprises auxiliary coils 41, 42,... between the poles 12A, 12B of the yoke 11. The auxiliary coils of both sides of the exciting poles to be excited are simultaneously energized to strengthen a magnetic flux. When the poles 12A, 12B,... are switched adjacently, the coils 41, 42,... between the poles are continued in exciting state, and hence a variation in the magnetic flux is small.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an improved reluctance motor.

[0002]

2. Description of the Related Art A conventional reluctance motor of this type is
As shown in FIG. 5, the stator 1 and the rotor 2 having a plurality of salient poles arranged inside the stator 1 are provided. The stator 1 is a ring-shaped stator yoke 11
And exciting magnetic poles 12A, 12B, ... Inwardly projecting from the stator yoke at intervals of 60 degrees, and a coil 3 is wound around each exciting magnetic pole. The salient poles of the rotor 2 sequentially face the exciting magnetic poles 12A, 12B, ... With rotation, and the facing surfaces are arcuate with the center of rotation of the rotor 2 as the center.

Then, a pair of exciting magnetic poles 12A and 12D facing each other with the center of rotation being excited, and the rotor 2 being in the position shown in the drawing, the next adjacent exciting magnetic poles 12B and 12D.
When the group E is excited, the new exciting magnetic poles 12B, 12
The salient pole 21 closest to this is attracted to E as shown by the arrow. By repeating these actions in steps, the rotor 2 rotates.

[0004]

However, in the above-mentioned conventional technique, since the inductance of the exciting magnetic pole is large, it is difficult to input the exciting current in steps.
Therefore, there is a problem that the torque ripple becomes large. Further, when the number of turns of the coil wound around the exciting magnetic pole is increased to increase the torque, the inductance further increases, and it becomes more difficult to input the exciting current stepwise. Therefore, in view of the above problems, it is an object of the present invention to provide a reluctance motor capable of increasing output torque without increasing torque ripple.

[0005]

To achieve the above object, the present invention provides a ring-shaped stator yoke, a plurality of exciting magnetic poles protruding inside the stator yoke, and windings around the exciting magnetic poles. In a reluctance motor including a stator having a coil and a rotor having a salient pole protruding to the outside, an auxiliary coil is provided between each exciting magnetic pole of the stator yoke.

[0006]

[Function] When each exciting magnetic pole is sequentially excited while switching, when the auxiliary coils located on both sides of the excited magnetic pole are also excited, when the next exciting magnetic pole is excited next time, it is excited until now. The auxiliary coil between the existing exciting magnetic pole and the exciting magnetic pole is maintained in the excited state as it is. Therefore, the change in magnetic flux is small, and the magnetic force of the auxiliary coil compensates for the shortage of magnetic flux due to the delay in rising when the exciting magnetic pole is switched.

[0007]

FIG. 1 shows an embodiment of the present invention. It should be noted that components similar to those of the conventional technique are denoted by the same reference numerals and will be described.
The reluctance motor M includes a stator 1 and a rotor 2 arranged inside the stator 1.
Is a ring-shaped stator yoke 11 and exciting magnetic poles 12A, 12B, ..., 12F formed on the stator yoke 1.
Have. Each exciting magnetic pole has a rotor 2 at an interval of 60 degrees.
Is formed so as to protrude toward the center of the rotor 2, and the tip is formed on an arc surface 13 centered on the rotation axis of the rotor 2. , 12F are wound around the exciting magnetic poles 12A, 12B, ..., 12F of the stator 1, and the auxiliary coil 4 is provided between the exciting magnetic poles of the stator yoke 11.
1, 42, ..., 46 are provided.

The rotor 2 has four salient poles 21 protruding outward at 90-degree intervals. The tips of the salient poles 21 are arcuate surfaces 22 centered on the rotation axis of the rotor, and can face the arcuate surfaces 13 of the exciting magnetic poles.

The coils 3 form a phase between them so that the magnetic flux is inputted from one of the exciting magnetic poles facing each other with the rotor rotating shaft interposed therebetween and is outputted from the exciting magnetic pole on the opposite side. That is, by combining the opposing excitation magnetic poles 12A and 12D, U
Phase, similarly, the exciting magnetic poles 12B and 12E are the V phase, and the exciting magnetic pole 1
Let 2C and 12F be the W phase. Where U phase, V phase, W
The polarities of the phase and the auxiliary coils 41, 42, 43, 44, 45, 46 are set to the directions indicated by arrows u, v, w, and a to f, respectively.

FIG. 2 shows a state in which the U-phase exciting magnetic poles 12A and 12D are excited, and at this time, the U-phase exciting magnetic poles 12A and 12D.
The auxiliary coils 41, 43, 44 and 46 on both sides of 2D are simultaneously excited. The direction of the magnetic flux of the stator 1 due to the U phase is
It occurs in the u direction. And the auxiliary coil 4 at this time
The magnetic flux directions of 1, 43, 44, and 46 are a, c, d, and f, which coincide with and strengthen the magnetic flux direction of the U phase.
The coil 3 and the auxiliary coil that is not excited are not shown for simplicity. The same applies to FIG. 3 described later.

Next, the excitation magnetic poles are excited from the U phase to the excitation magnetic pole 12
When switching to the V phase of B and 12E, the magnetic flux of the stator 1 is generated in the v direction as shown in FIG. At this time, the auxiliary coils 41 and 4 on both sides of the V-phase exciting magnetic pole are also provided
2, 44 and 45 are excited at the same time. The directions of the magnetic flux by the auxiliary coil are a, b, d, and e, and coincide with the direction of the V-phase magnetic flux. FIG. 4 is a time chart showing changes in the excitation state during phase switching. When the U-phase excitation magnetic pole is excited, the auxiliary coils 41, 43, 44, 46 are simultaneously excited and the excitation is switched to the V-phase. The auxiliary coil 4
It can be seen that 1, 42, 44 and 45 are also excited at the same time, and the auxiliary coils 41 and 44 continue to be in the excited state during this period.

Similarly, when the excitation is switched from the V phase to the W phase, the magnetic flux of the stator 1 is generated in the w direction, at which time the auxiliary coils 42, 43, 45 and 46 are excited and b , C, d, e directions enhance the magnetic flux in the w direction. During this switching, the auxiliary coils 42 and 45 remain in the excited state.

In this embodiment, as described above, the auxiliary coil is provided between the exciting magnetic poles of the stator yoke to reinforce the magnetic flux by the exciting magnetic poles, and the phases of the opposing exciting magnetic poles are sequentially switched and excited. Since a part of the auxiliary coil is kept excited even after switching, the change in magnetic flux in the stator part is reduced, and the shortage of magnetic flux due to the delay in rising of the exciting current of the exciting magnetic pole is compensated. As a result, the output torque can be increased while suppressing the torque ripple.

[0014]

As described above, according to the present invention, the auxiliary coil is provided between the exciting magnetic poles of the stator yoke, and when the exciting magnetic pole is excited, the auxiliary coils on both sides of the exciting magnetic pole are excited to strengthen the magnetic flux. As a result, when the excitation target switches to the adjacent excitation pole, the auxiliary coil between both excitation poles continues to be in the excited state, so there is little change in the magnetic flux, the effect of the rising delay of the excitation current is mitigated, and torque ripple is suppressed. Meanwhile, the output torque is increased.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a direction of magnetic flux of an exciting magnetic pole.

FIG. 3 is a diagram showing a direction of magnetic flux after switching excitation of an excitation magnetic pole.

FIG. 4 is a time chart showing changes in the excitation state.

FIG. 5 is a diagram showing a conventional reluctance motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 stator 11 stator yoke 12A, 12B, ... Excitation magnetic pole 2 rotor 21 salient pole 3 coil 41, 42, ... auxiliary coil

Claims (1)

[Claims] 1. A stator having a ring-shaped stator yoke, a plurality of exciting magnetic poles protruding inside the stator yoke, a coil wound around the exciting magnetic pole, and a salient pole protruding outward. A reluctance motor including a rotor, wherein an auxiliary coil is provided between each exciting magnetic pole of the stator yoke.