JP2002281719A - Full-pitch winding double salient pole type reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high-torque performance by decreasing a percentage of torque ripple in a full-pitch winding double salient pole type reluctance motor. SOLUTION: A full-pitch winding double salient pole type reluctance motor includes a full-pitch winding salient pole stator, and a salient pole rotor positioned rotatably on the inner periphery side of the stator. A pole front end width WS2 of a stator pole wound with a stator winding to a pole front end width WS1 (WS2/WS1) is set to 0.5 to 0.85.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-section double salient pole type reluctance motor.

[0002]

2. Description of the Related Art A fully wound double salient pole type reluctance motor has
This is formed by changing the winding specification of a switch reluctance motor from a concentrated winding type to an all-winding type, and is formed by winding the stator winding across the stator poles and winding it all the way. . All-section wound double salient pole type reluctance motors have recently achieved a higher salient pole ratio based on a change in mutual inductance and a higher torque / current ratio than a concentrated winding switch reluctance motor. It is a reluctance motor that has received much attention.

[0003] Compared to a concentrated winding switch reluctance motor, a full-pitch double salient pole type reluctance motor is suitable for bipolar current drive in terms of the polarity of drive current, and is suitable for an inexpensive variable speed drive system driven by a general-purpose inverter. Expected for application. Japanese Patent Laid-Open Publication No. 7-504079 discloses an example of a fully wound double salient pole type reluctance motor.

[0004]

By the way, in the conventional full-section double-pole salient-pole reluctance motor, as shown in the static torque waveform disclosed in the above-mentioned publication, Y-connection drive by a general-purpose inverter is assumed. In this case, the torque ripple ratio is large, and high torque cannot be achieved. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to achieve high torque performance by reducing the torque ripple ratio in a full-section double salient pole type reluctance motor.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a fully-wound double salient pole type reluctance motor, and a full-wound double salient pole type reluctance motor according to the present invention has a stator winding fully wound. What is claimed is: 1. A reluctance motor comprising a salient pole type stator and a salient pole type rotor rotatably positioned on an inner peripheral side of the salient pole type stator, wherein a magnetic pole tip width WS1 of a stator magnetic pole on which a stator winding is wound. , The width WS2 (WS2 / WS1) of the magnetic pole portion is set to 0.5 to 0.85.

[0006] In the full-boiled double salient pole type reluctance motor according to the present invention, the pole tip width WS1 of the stator poles of the salient pole type stator and the pole tip width WR1 of the rotor poles of the salient pole type rotor are determined. The same size is set, and a rotor magnetic pole of the salient pole type rotor is gradually narrowed in a radial direction away from an opposing surface of the salient pole type stator, and a magnetic pole portion width WR2 of the rotor magnetic pole is set to the stator pole. The width y2 of the back yoke of the salient pole type stator and the salient pole type rotor is set to be the same as the magnetic pole width WS2.
It is preferable to set WRY to be equal to or more than the magnetic pole width WS2 of the stator magnetic pole of the salient pole type stator. In the present invention, the full-turn winding means that the coil pitch and the magnetic pole pitch are wound so as to be equal, and the magnetic pole pitch in the reluctance motor is two continuous windings of opposite polarity that are simultaneously excited. It is the peripheral distance between the poles. The double salient pole type means that the salient poles of the salient pole type stator and the salient pole type rotor are configured to face each other.

[0007]

The function and effect of the present invention are as follows. In the all-pole double salient pole reluctance motor according to the present invention, basically, the magnetic pole width WS2 with respect to the magnetic pole tip width WS1 of the stator magnetic pole on which the stator winding is wound. (WS2 / WS1) 0.5 to
It is set to 0.85. If the relationship between the magnetic pole tip width WS1 and the magnetic pole width WS2 of the stator poles is set in this way in the full-section double salient pole type reluctance motor, the reluctance torque increases when performing Y-connection driving by a general-purpose inverter. In addition, both conditions that the torque ripple ratio is small can be satisfied, and a high-performance and inexpensive all-section double salient pole type reluctance motor can be configured.

[0008] In the full-boiled double salient pole type reluctance motor according to the present invention, the pole tip width WS1 of the stator poles of the salient pole type stator and the pole tip width WR1 of the rotor poles of the salient pole type rotor are set to the same size. If it is set, the rotor magnetic pole of the salient pole type rotor is gradually narrowed in the radial direction away from the facing surface of the salient pole type stator, and the magnetic pole portion width WR2 of the rotor magnetic pole is set to the magnetic pole of the stator magnetic pole. Part width WS
2, the back yoke width WS of each of the salient pole type stator and the salient pole type rotor is further increased.
If Y and WRY are set to be equal to or larger than the magnetic pole portion width WS2 of the stator poles of the salient pole type stator, it is possible to configure a higher performance all-pole double salient pole type reluctance motor.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a first reluctance motor 10 which is a conventional concentrated winding switch reluctance motor, and FIG.
FIG. 3 shows a second reluctance motor 20 which is a fully-reversed double salient pole type reluctance motor according to the present invention. FIG. 3 shows a third reluctance motor 30 which is a fully-reversed double salient pole type reluctance motor according to the present invention. Is shown. Each of the reluctance motors 20 and 30 according to the present invention is a three-phase, high-performance, full-section, double-pole, salient-pole reluctance motor that performs Y-connection driving using a general-purpose inverter.

A first reluctance motor 10 which is a concentrated winding switch reluctance motor includes a salient pole type stator 1
And a salient pole type rotor 12 rotatably supported and positioned on the inner peripheral side of the salient pole type stator 11.
3 are independently and collectively wound to form twelve stator magnetic poles 11a on the inner peripheral side of the salient pole type stator 11.
On the other hand, the salient pole type rotor 12 includes a large number of protrusions projecting toward the inner peripheral side of the salient pole type stator 11 on the outer peripheral side facing the inner peripheral side of the salient pole type stator 11. Eight rotor magnetic poles 12a opposed to the stator magnetic poles 11a are configured to be rotatably supported on the circumference.

In the reluctance motor 10,
The stator magnetic pole 11a has the same width in the radial direction as to be separated from the tip of the magnetic pole tip of the rotor magnetic pole 12a.
a is formed to have substantially the same width in the radial direction that is spaced apart from the tip of the magnetic pole tip of the stator magnetic pole 11a.
1a and the rotor magnetic pole 12a are formed to have the same width Wo. This configuration is a means for reducing the size of the reluctance motor 10, and is for setting the maximum magnetic flux crossing the stator magnetic pole 11a to be substantially magnetically saturated at the tip of the magnetic flux when the motor torque is generated.

On the other hand, the second reluctance motor 2 which is a full-section double salient pole type reluctance motor according to the present invention.
Reference numeral 0 denotes a salient pole type stator 21 and a salient pole type rotor 22 rotatably supported and positioned on the inner peripheral side of the salient pole type stator 21.
The reluctance motor 20 is the same as the reluctance motor 10 that is a concentrated winding switch reluctance motor in the point that
3 is fully wound around all of the many teeth of the salient pole type stator 21 to form 12 stator magnetic poles 21a. The stator winding 23 is wound so as to include three teeth. On the other hand, the salient pole type rotor 22
On the outer peripheral side facing the inner periphery of the salient pole type stator 21, there are provided a large number of protrusions projecting toward the inner peripheral side of the salient pole type stator 21,
The eight rotor magnetic poles 2 facing the stator magnetic poles 21a while being rotatably supported on the inner periphery of the salient pole type stator 21
2a.

A third reluctance motor 30, which is a full-section double salient pole type reluctance motor according to the present invention, comprises:
A salient pole type stator 31 and a salient pole type rotor 32 rotatably supported and positioned on the inner peripheral side of the salient pole type stator 31 are provided. , And constitutes 12 stator magnetic poles 31a. Stator winding 33
Are wound in the same manner as the stator winding 23 in the second reluctance motor 20. On the other hand, the salient pole type rotor 32 is provided with a large number of projections projecting toward the inner peripheral side of the salient pole type stator 31 on the outer peripheral side facing the inner peripheral side of the salient pole type stator 31. Eight rotor magnetic poles 32a opposing the stator magnetic poles 31a are supported rotatably around the circumference.

Thus, in the second reluctance motor 20 which is a full-section double salient pole type reluctance motor,
As shown in FIG. 2, the stator pole 21 a of the salient pole type stator 21 has a radial length away from the tip of the rotor pole 22 a from the tip of the rotor pole 22 a during a predetermined length from the tip of the pole tip. The width is gradually reduced, and is the same width up to the subsequent back yoke 21b. On the other hand, the rotor magnetic pole 22a of the salient pole type rotor 22 is formed to have substantially the same width in a radial direction away from the tip of the magnetic pole tip of the stator magnetic pole 21a up to the back yoke 22b. With this configuration, the magnetic pole width WS2 (WS2 / WS) with respect to the magnetic pole tip width WS1 of the stator magnetic pole 21a.
1) is set to 0.5 to 0.85. The width WS1 of the magnetic pole tip of the stator magnetic pole 21a and the width of the rotor magnetic pole 22
a and the salient pole type stator 21 and the salient pole type rotor 22
The back yoke widths WSY and WRY of the
The magnetic pole portion width WS2 is set to be equal to or larger than 1a.

Further, in a third reluctance motor 30 which is a full-section wound double salient pole type reluctance motor, FIG.
As shown in FIG.
a is formed to be gradually narrower in the radial direction away from the tip of the magnetic pole tip of the rotor magnetic pole 32a from the tip for a predetermined length from the tip of the magnetic pole tip, and to the back yoke 31b thereafter. Are formed in the same width. On the other hand, the salient pole type rotor 32 is formed so as to be gradually narrower in the radial direction away from the tip of the magnetic pole tip of the stator pole 31a from the tip thereof for a predetermined length from the tip of the magnetic pole tip. The same width is formed up to the back yoke 32b. With this configuration, the stator poles 31
a of the magnetic pole tip width WS1 with respect to the magnetic pole tip width WS1 (WS2
2 / WS1) is set to 0.5 to 0.85. Further, the pole tip width WS1 of the stator pole 31a is the same as the pole tip width WR1 of the rotor pole 32a, and the pole width WS2 of the stator pole 31a is the same as the pole width WR2 of the rotor pole 32a. Is set to Further, the salient pole type stator 31 and the salient pole type rotor 32
Each of the back yoke widths WSY and WRY of the stator pole 3
The magnetic pole portion width WS2 is set to 1a or more.

In the reluctance motor 30, the space 32c formed between the rotor magnetic poles 32a has a bag shape due to the shape of the rotor magnetic poles 32a of the salient pole type rotor 32. It is preferable to reduce irregularities on the outer periphery of the salient pole type rotor 32 by filling a resin filler indicated by reference numeral 34 or the like. By filling all the space portions 32c with the filler 34, the wind-off operation at the time of rotation of the salient-pole type rotor 32 can be eliminated, and the reduction of the motor torque due to the wind-off can be prevented.

As described above, each reluctance motor 20, which is a full-section wound double salient pole type reluctance motor according to the present invention,
30, basically, the stator windings 23, 33
Pole width WS2 (WS2 / WS) with respect to the pole tip width WS1 of the stator poles 21a and 31a on which the windings are wound.
1) is set to 0.5 to 0.85. Magnetic pole tip width WS1 and magnetic pole width WS of stator pole 21a
In the case of performing the Y-connection drive by the general-purpose inverter, both conditions of a large reluctance torque and a small torque ripple ratio can be satisfied, and a high-performance all-section twin-pole collision can be satisfied. A polar reluctance motor can be configured.

Further, like the second reluctance motor 20 and the third reluctance motor 30, the widths WS1 of the magnetic pole tips of the stator poles 21a, 31a of the salient pole type stators 21, 31 and the widths WS1 of the salient pole type rotors 22, 32 are provided. Rotor pole 22
If the width WR1 of the magnetic pole tip of the a and 32a is set to the same size, the width of the rotor magnetic pole 32a of the salient pole type rotor 32 gradually decreases in the radial direction away from the facing surface of the salient pole type stator 31. If the magnetic pole portion width WR2 of the rotor magnetic pole 32a is set to be the same as the magnetic pole portion width WS2 of the stator magnetic pole 31a, the salient pole type stators 21, 31 and the salient pole type rotor 22, By setting the back yoke widths WSY and WRY of the 32 to be equal to or greater than the magnetic pole width WS2 of the stator poles 21a and 31a of the salient pole type stators 21 and 31, a higher performance all-section double salient pole reluctance motor can be obtained. Can be configured.

[0019]

This embodiment relates to a full-recession wound double salient pole type reluctance motor of the type shown in FIG. 2, in which the relationship between the magnetic pole tip width WS1 and the magnetic pole width WS2 of the stator poles is appropriately changed. Types of reluctance motors (RM1, RM2, R
M3, RM4, RM5), and the relationship (WS2 / W) between the magnetic pole tip width WS1 and the magnetic pole width WS2 of the stator pole.
The effect of S1) on the average torque of the reluctant motor and the torque ripple ratio is examined.

Each of the reluctance motors (RM1, RM2, RM3, RM4, RM5) created in the present embodiment are shown in FIG.
Is the same type as the second reluctance motor 20, and has a magnetic pole tip width WS1 and a magnetic pole width W of the stator poles.
Only the relationship (WS2 / WS1) with S2 is different. Each reluctance motor (RM1, RM2, RM
, RM4, RM5), the relationship (WS2 / W) between the magnetic pole tip width WS1 and the magnetic pole width WS2 of the stator magnetic poles.
S1) is 1, 0.84, 0.77, 0.59, 0.5
The static torque waveform was measured for each of the reluctance motors set as described above, and the static torque waveform shown in FIG. 5 was obtained.

In this embodiment, the average torque and the torque ripple ratio are calculated from the static torque waveform, and the results are shown in Table 1. In addition, (WS2 / WS1) and the average torque ratio and the torque ripple ratio ratio are calculated. The relationship is shown in the graph of FIG. For comparison, in a concentrated winding switch reluctance motor (SRM) formed similarly to the concentrated winding switch reluctance motor 10 shown in FIG.
The static torque waveform, the average torque, and the torque clip ratio for the case where S1 and WR1 are the same are also shown.

However, each reluctance motor (RM1, R
M2, RM3, RM4, and RM5), when the number of stator poles is 12, the number of rotor poles is 8, and the rectangular wave drive is 120-degree energized, the average torque is a static torque waveform shown in FIG. The rotor rotation range for 15 degrees is set and determined so that the average torque (Nm) is maximized. Further, the torque ripple ratio (%) is (the difference between the maximum torque and the minimum) / the average torque within the same range.

Each reluctance motor (RM1, R
M2, RM3, RM4, and RM5), the windings are set so that the motor copper loss is the same at the same current. Further, each reluctance motor (RM1, RM2, RM3, RM) which is a full-section double salient pole type reluctance motor is used.
4, RM5: The same degree between a full-section double salient pole type reluctance motor that performs Y-connection driving by a general-purpose inverter and a concentrated winding switch reluctance motor (SRM: a concentrated winding switch reluctance motor that performs independent energization) In order to obtain an average torque, the length of each reluctance motor (RM1, RM2, RM3, RM4, RM5) in the core axis direction is controlled by a concentrated winding switch reluctance motor (SR).
M) is 0.73 times the core axial length. This is because the all-pole wound double salient pole type reluctance motor that performs Y-connection drive by a general-purpose inverter has a core outer diameter of a salient pole type rotor and a core outer diameter of a salient pole type stator compared to a concentrated winding switch reluctance motor. Is common, the torque per unit length in the core axial direction increases.

[0024]

[Table 1]

As apparent from the static torque waveform shown in FIG. 5 and Table 1, each reluctance motor (RM
1, RM2, RM3, RM4, RM5), (WS2 / WS1) is in the range of 0.6 to 1 for the average torque, and (WS2 / WS) for the torque ripple ratio.
1) is good in the range of 0.5 to 0.85. However, since the change in the average torque is small compared to the change in the torque ripple ratio, it is preferable to set (WS2 / WS1) in a small range where the change in the torque ripple ratio is small, and (WS2 / WS1) is 0.5. It is better to set it in the range of 0.85.

As is apparent from the above results, the full-pole double salient pole type reluctance motor (RM1) formed by performing full-pitch winding using the salient-pole type stator core of the concentrated winding switch reluctance motor (SRM) as it is. In ()), when the Y-connection rectangular wave drive is energized at 120 degrees, the torque generation range becomes narrow and the torque ripple ratio increases. On the other hand, each reluctance motor (RM2, RM3,
In RM4, RM5), the torque ripple ratio is greatly reduced. This point will be described based on the reluctance motor shown in FIG.

4A to 4D show the salient pole type rotor angle 22.5 degrees, 25.
5 degrees, 37.5 degrees, and 45 degrees are shown, and each figure shows a generated magnetic pole and a magnetic flux. The torque that generates torque in a full-section wound double salient pole type reluctance motor is
(A) In the angle range of 30 to 30 degrees, the rotor magnetic pole A is
In the angle range from 0 degree to (c), the rotor poles are A and B,
The rotor magnetic pole B is present in the angle ranges (c) to (d). (WS2 / WS1) of a full-section wound double salient pole type reluctance motor
Is 1 (RM1), the magnetic flux passing through the rotor magnetic pole A decreases and the magnetic flux passing through the rotor magnetic pole B increases in the angle range of (c) to (d). Therefore, in the angle range, the total magnetic flux passing through the rotor magnetic poles A and B does not change.
The generated torque drops sharply. This phenomenon is clearly seen in the static torque waveform graph shown in FIG.

Such a reluctance motor (RM1)
On the other hand, when (WS2 / WS1) is set to be smaller than 1, (RM2 to RM5), the magnetic flux passing through the rotor magnetic pole A is limited, so that the rotor magnetic pole is limited in the angular range of (c) to (d). As compared with the decrease in the magnetic flux passing through A, the increase in the magnetic flux passing through the rotor magnetic pole B exceeds the increase, and the total magnetic flux passing through the rotor magnetic poles A and B increases to generate torque. On the other hand, (a) to (c)
In the angle range described above, the angle range that contributes to the torque of the rotor magnetic pole A becomes narrow, and the torque decreases. As a result, in the reluctance motors (RM2 to RM5), torque can be generated in a wide angle range, and the torque ripple ratio is improved.

Thus, the reluctance motor (RM2
To RM5) can achieve low torque ripple in the Y-connection drive, and can be suitably used for applications requiring high reliability. Further, the reluctance motors (RM2 to RM5) can provide this at a low cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a concentrated winding switch reluctance motor.

FIG. 2 is a schematic configuration diagram showing an example of a full-section wound double salient pole type reluctance motor according to the present invention.

FIG. 3 is a schematic configuration diagram showing another example of a full-section wound double salient pole type reluctance motor according to the present invention.

FIGS. 4A to 4D are schematic configuration diagrams (a) to (d) illustrating the operation of a full-section double salient pole type reluctance motor.

FIG. 5 is a graph showing a static torque waveform of each reluctance motor.

FIG. 6 is a graph showing an average torque ratio and a torque ripple ratio of each reluctance motor.

[Explanation of symbols]

10, 20, 30 ... reluctance motor, 11, 21,
31 salient pole type stator, 11a, 21a, 31a stator magnetic pole, 12, 22, 32 ... salient pole type rotor, 12a,
22a, 32a ... rotor poles, 21b, 22b, 31
b, 32b: back yoke, 32c: space, 13, 2
3, 33: stator winding, 34: filler, A, B: rotor magnetic pole.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 37/04 H02K 37/04 F // H02K 1/16 1/16 A

Claims (4)

[Claims] 1. A salient pole type stator having a salient pole type stator in which a stator winding is fully wound and a salient pole type rotor rotatably positioned on an inner peripheral side of the salient pole type stator. Pole width WS1 with respect to the pole tip width WS1 of the stator pole in the salient pole type stator
2 (WS2 / WS1) is set in the range of 0.5 to 0.85. 2. A salient pole type reluctance motor according to claim 1, wherein said salient pole type stator has a pole tip width WS1 of a stator pole and a pole tip width of a rotor pole of said salient pole type rotor. WR1 is set to have the same dimensions as a full-pitch double salient pole type reluctance motor. 3. The reluctance motor according to claim 1, wherein the rotor magnetic poles of the salient pole type rotor gradually become narrower in a radial direction away from an opposing surface of the salient pole type stator. And a magnetic pole portion width WR2 of the rotor magnetic pole is set to be the same as the magnetic pole portion width WS2 of the stator magnetic pole. 4. A reversal motor according to claim 1, 2 or 3, wherein the back yoke widths WSY, W of the salient pole type stator and the salient pole type rotor are different.
RY is set to be greater than or equal to the magnetic pole width WS2 of the stator poles of the salient pole type stator.