CN203761230U - Switched reluctance motor - Google Patents
Switched reluctance motor Download PDFInfo
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- CN203761230U CN203761230U CN201420040837.4U CN201420040837U CN203761230U CN 203761230 U CN203761230 U CN 203761230U CN 201420040837 U CN201420040837 U CN 201420040837U CN 203761230 U CN203761230 U CN 203761230U
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- switched reluctance
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- reluctance motor
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- 230000003068 static effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 description 6
- 230000010349 pulsation Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model provides a switched reluctance motor, which comprises a stator and a rotor, wherein the stator comprises an outer stator and an inner stator; the tooth parts of the outer stator and the tooth parts of the inner stator are all wound with coils; the coils of the outer stator and the coils of the inner stator are mutually independent; the rotor is arranged between the inner stator and the outer stator; the rotor comprises inner-layer salient pole teeth and outer-layer salient pole teeth; the outer-layer salient pole teeth and the tooth parts of the outer stator mutually act; and the inner -layer salient pole teeth and the tooth parts of the inner stator mutually act. According to the switched reluctance motor, through independent connection and independent control of the coils on the outer stator and the coils on the inner stator, the minimum value of the motor torque is improved, the motor torque pulse can be reduced by more than 30% on the premise of not sacrificing the motor efficiency, and in addition, control flexibility of the motor is enhanced, and the power density of the motor is enhanced.
Description
Technical Field
The utility model relates to the technical field of electric machines, especially, relate to a switched reluctance motor.
Background
The switched reluctance motor has the advantages of simple structure, good motor reliability, excellent starting performance, high comprehensive efficiency and the like, and is widely researched. However, the periodic variation amplitude of the radial force and the tangential force of the motor caused by large torque pulsation and large radial magnetic pull force of the switched reluctance motor is overlarge, so that excitation force is generated and acts on a yoke part of the stator, the stator is vibrated and acts on nearby air, and sound waves and noise are generated.
The existing means for reducing the torque ripple mainly comprise the following means:
1. the variable air gap structure is adopted in the aspect of structure, so that the air gap is changed from large to small in the approaching process of the stator tooth part and the rotor tooth part, and the torque pulsation peak value is reduced in a transition stage. Or a V-shaped groove is formed at the top of the rotor tooth. However, in the process of gradual change of the air gap, or by adopting a tooth top slotting structure, the average air gap is increased, so that the current required for generating the same magnetic energy is increased, and the overall efficiency of the motor is reduced.
2. The structure of double stators is adopted, and the stators are staggered by a certain angle. The windings are turned off or turned on simultaneously, however, the angle relationship between the inner stator and the outer stator and the angle relationship between the inner stator and the rotor are staggered, and when the outer convex teeth of the outer stator and the outer convex teeth of the rotor are at the optimal turn-on time, the inner stator and the inner convex teeth of the rotor are not necessarily at the optimal turn-on time, so that the torque pulsation is not optimally reduced.
3. The permanent magnets are added to reduce torque ripple based on the magnetic flux provided by the permanent magnets. Because the working environment of the permanent magnet cannot be too severe, the application robustness of the switched reluctance motor is greatly reduced due to the addition of the permanent magnet.
4. A double-stator or double-rotor structure is adopted, and the two-end stator is axially divided and staggered by a certain angle. However, because of the existence of the end part of the motor, a larger distance is inevitably formed between the two sections of stators, the volume of the motor is increased, and the power density of the motor is reduced.
SUMMERY OF THE UTILITY MODEL
In view of the current situation of the prior art, an object of the present invention is to provide a switched reluctance motor, which effectively reduces the torque ripple of the motor without sacrificing the efficiency of the motor.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a switched reluctance motor includes a stator and a rotor;
the stator comprises an outer stator and an inner stator, coils are wound on the tooth part of the outer stator and the tooth part of the inner stator, and the coils of the outer stator and the coils of the inner stator are independent;
the rotor is arranged between the inner stator and the outer stator and comprises inner-layer salient pole teeth and outer-layer salient pole teeth; the outer salient pole teeth interact with the tooth parts of the outer stator, and the inner salient pole teeth interact with the tooth parts of the inner stator.
In one embodiment, the outer layer salient pole teeth and the inner layer salient pole teeth protrude in opposite directions along the radial direction of the switched reluctance motor;
the teeth of the outer stator and the teeth of the inner stator protrude in opposite directions in a radial direction of the switched reluctance motor.
In one embodiment, the number of the outer layer salient pole teeth and the number of the inner layer salient pole teeth are the same and are both multiple;
the outer salient pole teeth are uniformly or discretely distributed on the outer periphery of the rotor, and the inner salient pole teeth are uniformly or discretely distributed on the inner periphery of the rotor.
In one embodiment, the number of the teeth of the outer stator and the number of the teeth of the inner stator are the same and are both multiple;
the teeth of the outer stators are uniformly or discretely distributed on the inner circumference of the outer stator, and the teeth of the inner stators are uniformly or discretely distributed on the outer circumference of the inner stator.
In one embodiment, the structural dimensions of the switched reluctance motor have the following relationship:
α-β=kτr，
wherein,
k is 0.5-0.7;
Nrthe number of outer layer salient pole teeth/inner layer salient pole teeth of the rotor is shown, and m is the phase number of the coil;
alpha is an angle between the center lines corresponding to the outer layer salient pole teeth and the inner layer salient pole teeth;
beta is an angle between center lines corresponding to the tooth parts of the inner stator and the outer stator;
τ r is the polar arc of the outer layer salient pole teeth, and τ r' is the polar arc of the inner layer salient pole teeth.
In one embodiment, the switched reluctance motor is 6 slots 4 poles, 12 slots 8 poles, 24 slots 16 poles or 24 slots 18 poles.
In one embodiment, the outer stator is fixed on a shell of the switched reluctance motor, the inner stator is fixedly connected with a static shaft of the switched reluctance motor, and the static shaft of the switched reluctance motor is fixed with the shell of the switched reluctance motor;
the outer stator, the inner stator and the rotor are concentric.
The utility model has the advantages that:
the utility model discloses a switched reluctance motor through independent connection, the independent control of the coil on the outer stator and the coil on the inner stator, has improved the minimum of motor torque to under the prerequisite that does not sacrifice motor efficiency, reduce the torque ripple of motor more than 30%. Meanwhile, the flexibility of motor control is enhanced, and the power density of the motor is improved.
Drawings
Fig. 1 is a cross-sectional view of an embodiment of a switched reluctance motor according to the present invention;
fig. 2 is a cross-sectional view of the switched reluctance motor of fig. 1 at angle 1;
fig. 3 is a cross-sectional view of the switched reluctance motor of fig. 1 at angle 2;
FIG. 4 is a cross-sectional view of the switched reluctance motor of FIG. 1 at angle 3;
FIG. 5 is a torque output graph of the switched reluctance motor of FIG. 1;
fig. 6 is an angle relation diagram of the switched reluctance motor of the present invention.
Detailed Description
In order to make the technical solution of the present invention clearer, the following description is made in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1 to 6, as shown in fig. 1, the switched reluctance motor of the present invention includes a stator and a rotor. The stator comprises an outer stator 10 and an inner stator 20, the outer stator 10 is fixed on a shell of the switched reluctance motor, the inner stator 20 is fixedly connected with a static shaft of the switched reluctance motor, and the static shaft of the switched reluctance motor is fixedly connected with the shell of the switched reluctance motor, so that the outer stator 10 and the inner stator 20 are both static. The teeth 11 of the outer stator and the teeth 21 of the inner stator are wound with coils 9.
Preferably, the coil on the outer stator and the coil on the inner stator are independent of each other, that is, the coil on the outer stator and the coil on the inner stator are independently connected and independently controlled. The coils of each phase of the outer stator are represented by A, B and C (only one pair of poles is marked in the figure, and the other coils circulate according to the circumference), and the coils of each phase are connected in series or in parallel. The coils of each phase of the inner stator are indicated by a, b and c (only one pair of poles is marked in the figure, and the rest are circulated according to the circumference), and the coils of each phase are connected in series or in parallel.
The rotor is disposed between the inner stator 20 and the outer stator 10, and preferably, the rotor, the outer stator and the inner stator are concentric. When the coil on the outer stator is electrified, the magnetic field formed by the outer stator drives the rotor to rotate; when the coil on the inner stator is electrified, the magnetic field formed by the inner stator drives the rotor to rotate. In this embodiment, the rotor includes two layers of salient teeth, an outer layer salient tooth 31 and an inner layer salient tooth 32. The inner salient teeth 32 interact with the teeth 21 of the inner stator and the outer salient teeth 31 interact with the teeth 11 of the outer stator.
The minimum value of the motor torque is improved through the independent connection and the independent control of the coil on the outer stator and the coil on the inner stator, so that the torque pulsation of the motor is reduced by more than 30% on the premise of not sacrificing the efficiency of the motor.
As an embodiment, the number of the outer-layer salient pole teeth 31 and the number of the inner-layer salient pole teeth 32 are the same and are multiple. The outer salient pole teeth are uniformly distributed or discretely distributed on the outer periphery of the rotor, and the inner salient pole teeth are uniformly distributed or discretely distributed on the inner periphery of the rotor. And the outer layer salient pole teeth 31 and the inner layer salient pole teeth 32 are protruded in opposite directions along the radial direction of the switched reluctance motor, namely, the outer layer salient pole teeth are protruded in a direction departing from a static shaft of the switched reluctance motor, and the inner layer salient pole teeth are protruded in a direction facing the static shaft of the switched reluctance motor.
Preferably, the number of the teeth 11 of the outer stator and the teeth 21 of the inner stator are the same and are each plural. The teeth 11 of the outer stators are uniformly or discretely distributed on the inner periphery of the outer stators, and the outer periphery of the outer stators is a circular arc surface. The teeth 21 of the inner stators are uniformly or discretely distributed on the outer circumference of the inner stator, and the inner circumference of the inner stator is a circular arc surface. In the present embodiment, the teeth 11 of the outer stator and the teeth 21 of the inner stator are protruded in opposite directions in a radial direction of the switched reluctance motor. Thus, in the process of rotating the rotor, the tooth part of the outer stator interacts with the outer layer salient pole teeth of the rotor, and the tooth part of the inner stator interacts with the inner layer salient pole teeth of the rotor.
Preferably, the switched reluctance motor may be 6 slots 4 poles, 12 slots 8 poles, 24 slots 16 poles or 24 slots 18 poles. In this embodiment, the switched reluctance motor is 12 slots and 8 poles. It should be clear that 12 slots means that the interval of adjacent teeth on the outer stator/inner stator is 12, and 8 poles means that the number of inner layer salient pole teeth/outer layer salient pole teeth on the rotor is 8. As shown in fig. 1, for convenience of description, the plurality of outer-layer salient pole teeth 31 are respectively denoted by 1, 2, 3, … … 8, and the plurality of inner-layer salient pole teeth 32 are respectively denoted by 1 ', 2', 3 ', … … 8'.
The utility model discloses a switched reluctance motor's operation principle as follows:
when the relative positions of the stator and the rotor are shown in fig. 2, the phase-A coil of the outer stator is controlled to be conducted, the outer layer salient pole tooth 1 of the rotor and the tooth part where the phase-A coil of the outer stator is located interact, and the rotor starts to rotate anticlockwise under the action of reluctance tension.
When the relative positions of the stator and the rotor are as shown in fig. 3, the phase a coil of the inner stator is controlled to be conducted, the inner layer salient pole teeth 1' of the rotor and the tooth part where the phase a coil of the inner stator is located start to interact, and the rotor continues to rotate in the counterclockwise direction under the action of the reluctance tension. At this time, the a-phase coil of the outer stator starts to be turned off, and the B-phase coil of the outer stator starts to be turned on.
In the process of reversing of a traditional switched reluctance motor, because the A-phase coil is turned off, the B-phase coil is in an initial conduction state, and the current of the B-phase coil is not stable, the torque is reduced too much. And the utility model discloses a switched reluctance motor is at the in-process of switching-over, owing to have the mutual action of the tooth portion at the a phase coil place of inlayer salient pole tooth 1' and inner stator for the minimum torque of motor can promote, has reduced torque pulsation.
When the relative positions of the stator and the rotor are shown in fig. 4, the a-phase coil of the inner stator is controlled to be turned off, at this time, the current of the B-phase coil of the outer stator reaches a stable value, the tooth part where the B-phase coil of the outer stator is located interacts with the outer layer salient pole teeth 2 of the rotor to generate magnetic pull force to output torque, and the rotor continues to rotate in the counterclockwise direction.
By repeating the positions shown in fig. 2 to 4 so that the phases are turned on in the order of conduction of a-B-C, in theory, a smooth torque curve can be generated. Compare in traditional switched reluctance motor, the utility model discloses a switched reluctance motor when each looks switching-over, the centre has added the mutual action of the inner strata salient pole tooth of rotor and internal stator, compensaties the torque pulsation that the rotor outer layer salient pole tooth caused with the external stator because the switching-over in-process.
As shown in fig. 5, which is a schematic graph of the torque output of the switched reluctance motor, the dotted line part is a schematic graph of the torque output of the original switched reluctance motor, and the minimum value of the torque of the switched reluctance motor is improved, so that the torque ripple is reduced.
In order to better minimize the torque ripple of the switched reluctance motor according to the above steps, as shown in fig. 6, the rotor is assumed to rotate counterclockwise, and the angle thereof is described as follows:
1. the angle between the center lines corresponding to the outer layer salient pole teeth and the inner layer salient pole teeth is alpha (marked as the angle between the outer layer salient pole teeth 1 and the inner layer salient pole teeth 1' in the figure); preferably, α is 56 °.
2. The angle between the center lines corresponding to the teeth of the inner stator and the teeth of the outer stator is beta (marked as the angle between the teeth of the phase coil of the outer stator A and the teeth of the phase coil of the inner stator a in the figure); preferably, β is 49 °.
3. The pole arc of the outer layer salient pole tooth is tau r, and the pole arc of the inner layer salient pole tooth is tau r'. Preferably, τ r is 18 ° and τ r' is 17 °.
The structural dimensions of the switched reluctance motor should have the following relationship:
(1) alpha-beta = k τ r, wherein k is 0.5-0.7;
（2）wherein N isrThe number of the salient pole teeth on the outer layer/the salient pole teeth on the inner layer, and m is the phase number of the coil.
The utility model discloses a switched reluctance motor through independent connection, the independent control of the coil on the outer stator and the coil on the inner stator, has improved the minimum of motor torque to under the prerequisite that does not sacrifice motor efficiency, reduce the torque ripple of motor more than 30%. Meanwhile, the flexibility of motor control is enhanced, and the power density of the motor is improved.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A switched reluctance motor comprises a stator and a rotor, and is characterized in that:
the stator comprises an outer stator and an inner stator, coils are wound on the tooth part of the outer stator and the tooth part of the inner stator, and the coils of the outer stator and the coils of the inner stator are independent;
the rotor is arranged between the inner stator and the outer stator and comprises inner-layer salient pole teeth and outer-layer salient pole teeth; the outer salient pole teeth interact with the tooth parts of the outer stator, and the inner salient pole teeth interact with the tooth parts of the inner stator.
2. The switched reluctance machine of claim 1, wherein:
the outer-layer salient pole teeth and the inner-layer salient pole teeth protrude in opposite directions along the radial direction of the switched reluctance motor;
the teeth of the outer stator and the teeth of the inner stator protrude in opposite directions in a radial direction of the switched reluctance motor.
3. The switched reluctance machine of claim 2, wherein:
the number of the outer-layer salient pole teeth is the same as that of the inner-layer salient pole teeth, and the outer-layer salient pole teeth and the inner-layer salient pole teeth are multiple;
the outer salient pole teeth are uniformly or discretely distributed on the outer periphery of the rotor, and the inner salient pole teeth are uniformly or discretely distributed on the inner periphery of the rotor.
4. The switched reluctance machine of claim 2, wherein:
the number of the tooth parts of the outer stator and the number of the tooth parts of the inner stator are the same and are multiple;
the teeth of the outer stators are uniformly or discretely distributed on the inner circumference of the outer stator, and the teeth of the inner stators are uniformly or discretely distributed on the outer circumference of the inner stator.
5. The switched reluctance machine of any one of claims 1 to 4, wherein:
the structural size of the switched reluctance motor has the following relationship:
α-β=kτr， <math>
<mrow>
<mfrac>
<mn>2</mn>
<mn>3</mn>
</mfrac>
<mi>τr</mi>
<mo>+</mo>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<msup>
<mi>τr</mi>
<mo>′</mo>
</msup>
<mo>≥</mo>
<mfrac>
<mrow>
<mn>2</mn>
<mi>π</mi>
</mrow>
<mrow>
<mi>m</mi>
<msub>
<mi>N</mi>
<mi>r</mi>
</msub>
</mrow>
</mfrac>
<mo>;</mo>
</mrow>
</math>
wherein,
k is 0.5-0.7;
Nrthe number of outer layer salient pole teeth/inner layer salient pole teeth of the rotor is shown, and m is the phase number of the coil;
alpha is an angle between the center lines corresponding to the outer layer salient pole teeth and the inner layer salient pole teeth;
beta is an angle between center lines corresponding to the tooth parts of the inner stator and the outer stator;
τ r is the polar arc of the outer layer salient pole teeth, and τ r' is the polar arc of the inner layer salient pole teeth.
6. The switched reluctance machine of claim 5, wherein:
the switched reluctance motor has 6 slots, 4 poles, 12 slots, 8 poles, 24 slots, 16 poles or 24 slots, 18 poles.
7. The switched reluctance machine of claim 5, wherein:
the outer stator is fixed on a shell of the switched reluctance motor, the inner stator is fixedly connected with a static shaft of the switched reluctance motor, and the static shaft of the switched reluctance motor is fixed with the shell of the switched reluctance motor;
the outer stator, the inner stator and the rotor are concentric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420040837.4U CN203761230U (en) | 2014-01-22 | 2014-01-22 | Switched reluctance motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420040837.4U CN203761230U (en) | 2014-01-22 | 2014-01-22 | Switched reluctance motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203761230U true CN203761230U (en) | 2014-08-06 |
Family
ID=51256464
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420040837.4U Expired - Lifetime CN203761230U (en) | 2014-01-22 | 2014-01-22 | Switched reluctance motor |
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| CN (1) | CN203761230U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333191A (en) * | 2014-09-09 | 2015-02-04 | 上海交通大学 | Permanent magnetic motor and control method thereof, and wind generator system and control method thereof |
| CN104734440A (en) * | 2015-03-19 | 2015-06-24 | 江门职业技术学院 | Double-stator magnetic resistance type angle sensor |
| CN104795952A (en) * | 2014-01-22 | 2015-07-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Switched reluctance motor |
| CN105370582A (en) * | 2014-08-26 | 2016-03-02 | 杭州三花研究院有限公司 | Electronic water pump |
| CN106341021A (en) * | 2016-04-08 | 2017-01-18 | 深圳市配天电机技术有限公司 | Electric vehicle, wheel, switched reluctance motor thereof and switched reluctance motor system |
| CN110429778A (en) * | 2019-08-31 | 2019-11-08 | 郑州大学 | A kind of electronic automobile-used U-shaped double-stator structure switched reluctance machines |
| CN113098219A (en) * | 2021-04-11 | 2021-07-09 | 郑州大学 | Hybrid winding doubly-salient rare-earth-free motor for new energy automobile and control strategy thereof |
-
2014
- 2014-01-22 CN CN201420040837.4U patent/CN203761230U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104795952A (en) * | 2014-01-22 | 2015-07-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Switched reluctance motor |
| CN104795952B (en) * | 2014-01-22 | 2018-02-09 | 珠海格力节能环保制冷技术研究中心有限公司 | Switched reluctance machines |
| CN105370582A (en) * | 2014-08-26 | 2016-03-02 | 杭州三花研究院有限公司 | Electronic water pump |
| CN104333191A (en) * | 2014-09-09 | 2015-02-04 | 上海交通大学 | Permanent magnetic motor and control method thereof, and wind generator system and control method thereof |
| CN104734440A (en) * | 2015-03-19 | 2015-06-24 | 江门职业技术学院 | Double-stator magnetic resistance type angle sensor |
| CN106341021A (en) * | 2016-04-08 | 2017-01-18 | 深圳市配天电机技术有限公司 | Electric vehicle, wheel, switched reluctance motor thereof and switched reluctance motor system |
| CN106357070A (en) * | 2016-04-08 | 2017-01-25 | 深圳市配天电机技术有限公司 | Electric vehicle, wheel, switch reluctance motor, switch reluctance motor system |
| CN110429778A (en) * | 2019-08-31 | 2019-11-08 | 郑州大学 | A kind of electronic automobile-used U-shaped double-stator structure switched reluctance machines |
| CN110429778B (en) * | 2019-08-31 | 2022-08-02 | 郑州大学 | U-shaped switched reluctance motor with double-stator structure for electric vehicle |
| CN113098219A (en) * | 2021-04-11 | 2021-07-09 | 郑州大学 | Hybrid winding doubly-salient rare-earth-free motor for new energy automobile and control strategy thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140806 Effective date of abandoning: 20180209 |