CN220172949U - Excitation structure for reducing motor torque fluctuation - Google Patents
Excitation structure for reducing motor torque fluctuation Download PDFInfo
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- CN220172949U CN220172949U CN202321444205.XU CN202321444205U CN220172949U CN 220172949 U CN220172949 U CN 220172949U CN 202321444205 U CN202321444205 U CN 202321444205U CN 220172949 U CN220172949 U CN 220172949U
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- 230000005284 excitation Effects 0.000 title claims abstract description 29
- 238000004804 winding Methods 0.000 claims abstract description 76
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000004323 axial length Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Windings For Motors And Generators (AREA)
Abstract
The utility model provides an excitation structure for reducing motor torque fluctuation, which comprises the following components: the stator comprises stator teeth, a rotor arranged in the stator, a stator yoke is arranged between two adjacent stator teeth, a coil groove is formed in one side, close to the center of a circle, of the stator yoke, an armature winding and an excitation winding are wound in the coil groove, the rotor comprises rotor teeth, a rotor yoke is arranged between two adjacent rotor teeth, a concave portion is formed in one side, close to the stator yoke, of the coil groove, and the excitation winding is wound outside the concave portion and the outer circumference of the stator yoke. Through the mode, the problem that the external output torque of the existing doubly salient motor fluctuates greatly is solved.
Description
Technical Field
The utility model relates to the field of doubly salient motors, in particular to an excitation structure for reducing motor torque fluctuation.
Background
As shown in fig. 1, the conventional doubly salient motor structure: the stator is mainly composed of four parts, namely a stator 1', a rotor 2', an armature winding 3 'and an excitation winding 4'; the stators 1 'and the rotors 2' are all of salient pole structures. The stator is composed of stator teeth 11', a stator yoke 12'; the stator teeth adopt parallel tooth structures, two long teeth in every three teeth are short teeth, wherein the two long teeth are distributed on two sides of the short teeth, and the stator teeth are symmetrically designed. The rotor 2' is formed by rotor teeth 21', rotor yoke 22 '; rotor teeth 2' are uniformly distributed on the periphery of the outer circle of the rotor. The armature winding 3' is formed of coil elements of uniform parameters nested on each stator tooth pole. Every three teeth on the stator 1 'are respectively nested A, B, C with three-phase armature winding coils, and 3' coils of each phase of armature winding are connected together in a serial and parallel mode. The exciting winding 4' is also formed by coil elements with consistent parameters, every three teeth of the stator are nested with one exciting winding coil element, each exciting winding coil element is simultaneously connected with a A, B, C three-phase armature winding coil in turn, and each exciting winding coil element is connected together in a serial and parallel mode.
The conventional doubly salient motor structure has the following technical problems: the parallel tooth structure results in that one tooth pole of every three teeth is relatively short in length, and the other two teeth are relatively long in length; a, B, C three-phase armature winding coils are embedded in each three tooth poles of the stator respectively, and meanwhile, a set of excitation winding coil is also required to be embedded; after the exciting winding is electrified, a magnetic field is generated to form a magnetic field loop of stator teeth-rotor yoke-another rotor teeth-another stator teeth-stator yoke-stator teeth; the length of the middle tooth pole is relatively short, the middle tooth pole is relatively far away from the exciting element, the magnetic resistance is relatively large, the magnetic resistance of two phases is relatively small, the asymmetric three-phase magnetic circuit causes the variation rate of the minimum value and the maximum value of the flux linkage of the armature winding to be inconsistent, and one opposite potential is high and distortion exists; because of potential difference, the current supplied to each phase of armature winding is different when the motor operates, so that the output of the three-phase winding is unbalanced, and the fluctuation of external output torque is larger. Each coil element of the exciting winding is nested on the A, B, C three-phase armature winding coil, radially spans a plurality of tooth poles, has large pitch, long conductor length and large internal resistance, increases copper loss of the exciting winding and has low motor efficiency. Each coil element of the exciting winding is nested on the A, B, C three-phase armature winding coil, the length of the winding end is equal to the length of the armature winding end plus the length of the exciting winding end, the axial length space of the motor is increased, and the volume of the motor is increased
Disclosure of Invention
In order to solve the problems, the utility model provides an excitation structure for reducing motor torque fluctuation, and solves the problem that the existing doubly salient motor has larger fluctuation of external output torque.
The main content of the utility model comprises: an excitation structure for reducing motor torque ripple, comprising: the stator comprises stator teeth, a rotor arranged in the stator, a stator yoke is arranged between two adjacent stator teeth, a coil groove is formed in one side, close to the center of a circle, of the stator yoke, an armature winding and an excitation winding are wound in the coil groove, the rotor comprises rotor teeth, a rotor yoke is arranged between two adjacent rotor teeth, a concave portion is formed in one side, close to the stator yoke, of the coil groove, and the excitation winding is wound outside the concave portion and the outer circumference of the stator yoke.
Preferably, the length of each stator tooth is the same, the center line of each stator tooth passes through the center of the stator, and the stator teeth are uniformly distributed on the circumference of the inner circle of the stator, so that the stator teeth form a straight tooth structure.
Preferably, the length of each rotor tooth is the same, the center line of each rotor tooth passes through the center of the rotor, and the rotor teeth are uniformly distributed on the periphery of the outer circle of the rotor, so that the rotor teeth form a straight tooth structure.
Preferably, the pole pairs of the stator and rotor are: 6K/4K, 6K/5K, 12K/8K, 24K/16K, 36K/26K.
Preferably, the stator and the rotor are both of salient pole structures.
Preferably, each stator yoke, every two adjacent stator yokes, every three adjacent stator yokes, and every four adjacent stator yokes are wound with an excitation winding.
The utility model has the beneficial effects that:
1. a, B, C three-phase armature winding coils are embedded in each three tooth poles of the stator respectively, a set of exciting winding coil does not need to be embedded, each coil element of the exciting winding is wound on each stator yoke respectively, and a magnetic field is generated after the exciting winding is electrified, so that a magnetic field loop of stator teeth-rotor yokes-other rotor teeth-other stator teeth-stator yokes-stator teeth is formed;
2. the stator teeth adopt a straight tooth structure and are uniformly distributed on the circumference of the inner circle of the stator, and the width and the length of the tooth poles are consistent;
3. the exciting winding is not arranged on the tooth poles of the three-phase armature winding of the turn chain, the tooth poles of the three-phase armature winding are not influenced by a magnetic field, the magnetic resistances of the tooth poles of the three-phase armature winding are the same, and the magnetic circuit is symmetrical;
4. the minimum value and the maximum value of flux linkage of the three-phase armature winding are consistent in the change rate, and no potential voltage difference exists;
5. when the motor runs, phase currents fed into each phase of armature winding are the same, the output of the three-phase winding is balanced, and the fluctuation of external output torque is small;
6. each coil element of the excitation winding is directly wound on the stator yoke, the pitch is small, the conductor length is short, the internal resistance is small, the copper loss of the excitation winding is reduced, and the motor efficiency is high;
7. each coil element of the excitation winding is directly wound on the stator yoke, the length of the winding end is equal to that of the armature winding end, the length of the excitation winding end is equal to that of the excitation winding end, the axial length space of the motor is shortened, and the volume of the motor is reduced.
Drawings
FIG. 1 is a schematic diagram of a conventional doubly salient motor;
FIG. 2 is a schematic diagram of an excitation structure for reducing torque ripple of a motor according to a preferred embodiment of the present utility model;
reference numerals:
1', stator, 2', rotor, 3', armature winding, 4', field winding, 11', stator teeth, 12', stator yoke, 13', coil slots, 21', rotor teeth, 22', rotor yoke;
1. stator, 2, rotor, 3, armature winding, 4, field winding, 11, stator teeth, 12, stator yoke, 13, coil slot, 14, recess, 21, rotor teeth, 22, rotor yoke.
Detailed Description
The technical scheme protected by the utility model is specifically described below with reference to the accompanying drawings.
As shown in fig. 2, an excitation structure for reducing motor torque ripple includes: the stator 1 and the rotor 2 arranged in the stator 1, the stator 1 comprises stator teeth 11, a stator yoke 12 is arranged between two adjacent stator teeth 11, a coil groove 13 is formed in one side, close to the center of a circle, of the stator yoke 12, the rotor 2 comprises rotor teeth 21, a rotor yoke 22 is arranged between two adjacent rotor teeth 21, A, B, C three-phase armature winding coils are embedded in each three tooth poles on the stator, and the armature winding 3 coils are located in the coil groove 13. The coil groove 13 is provided with a recess 14 on a side close to the stator yoke, the recess 14 being used for winding the field winding 4, each coil element of the field winding 4 being wound on a corresponding stator yoke 12. The exciting winding 4 generates a magnetic field after being electrified, and forms a magnetic field loop of stator teeth-rotor yoke-another rotor teeth-another stator teeth-stator yoke-stator teeth.
Further, the length of each stator tooth 11 is the same, the center line of each stator tooth passes through the center of the stator, and the stator teeth 11 are uniformly distributed on the circumference of the inner circle of the stator, so that a straight tooth structure is formed. The length of each rotor tooth 21 is the same, the center of the rotor tooth penetrates through the center of the rotor 2, the rotor teeth 21 are uniformly distributed on the periphery of the outer circle of the rotor to form a straight tooth structure, the exciting winding 4 is not provided with a turn chain three-phase armature winding tooth pole, the three-phase armature winding tooth pole is not influenced by a magnetic field, the magnetic resistances of the three-phase armature winding tooth poles are the same, and the magnetic circuit is symmetrical.
In this embodiment, the exciting windings 4 are disposed on the stator yokes 12 adjacent to each other every three stator poles, each coil element of the exciting windings 4 is directly wound on the stator yokes 12, the pitch is small, the conductor length is short, the internal resistance is small, the copper loss of the exciting windings is reduced, and the motor efficiency is high. And the length of the end part of the exciting winding 4 is equal to that of the end part of the armature winding 3, so that the axial length space of the motor is shortened, and the volume of the motor is reduced. When the motor runs, phase currents fed into each phase of armature winding are the same, the output of the three-phase winding is balanced, and the fluctuation of external output torque is small. The minimum and maximum flux linkage rates of the three-phase armature winding are consistent, and no potential voltage difference exists.
Further, the stator 1 and the rotor 2 are both of salient pole structures. The pole pair numbers of the stator 1 and the rotor 2 are as follows: 6K/4K, 6K/5K, 12K/8K, 24K/16K, 36K/26K. The pole pair numbers of the stator and the rotor in this embodiment are 12K/8K. And exciting windings are arranged on stator yokes adjacent to each three stator poles.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (6)
1. An excitation structure for reducing motor torque ripple, comprising: the stator, set up in the rotor in the stator, the stator includes the stator tooth, is provided with the stator yoke between two adjacent stator teeth the stator yoke is close to one side of centre of a circle and is provided with the coil groove the coil inslot is around being equipped with armature winding and excitation winding, the rotor includes the rotor tooth, is provided with the rotor yoke between two adjacent rotor teeth, its characterized in that, the coil groove is close to one side of stator yoke and is provided with the concave part, excitation winding winds and locates the concave part is outside with stator yoke outer circumference.
2. An excitation structure for reducing motor torque ripple as defined in claim 1, wherein each of the stator teeth has the same length and its center line passes through the center of the stator, and the stator teeth are uniformly distributed on the circumference of the inner circle of the stator so as to form a straight tooth structure.
3. An excitation structure for reducing motor torque ripple as defined in claim 1, wherein each rotor tooth has the same length and its center line passes through the center of the rotor, and said rotor teeth are uniformly distributed on the outer circumference of the rotor so as to form a straight tooth structure.
4. An excitation structure for reducing motor torque ripple as set forth in claim 1, wherein the pole pair numbers of said stator and rotor are: 6K/4K, 6K/5K, 12K/8K, 24K/16K, 36K/26K.
5. The excitation structure for reducing motor torque ripple of claim 1, wherein the stator and the rotor are both salient pole structures.
6. An excitation structure for reducing motor torque ripple as set forth in claim 1, wherein each stator yoke, each adjacent stator yoke of two stator poles, each adjacent stator yoke of three stator poles, and each adjacent stator yoke of four stator poles is wound with an excitation winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321444205.XU CN220172949U (en) | 2023-06-07 | 2023-06-07 | Excitation structure for reducing motor torque fluctuation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321444205.XU CN220172949U (en) | 2023-06-07 | 2023-06-07 | Excitation structure for reducing motor torque fluctuation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220172949U true CN220172949U (en) | 2023-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321444205.XU Active CN220172949U (en) | 2023-06-07 | 2023-06-07 | Excitation structure for reducing motor torque fluctuation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220172949U (en) |
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2023
- 2023-06-07 CN CN202321444205.XU patent/CN220172949U/en active Active
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