CN109617350B - Minimum unit four-pair-pole asymmetric design structure of multi-unit permanent magnet motor - Google Patents
Minimum unit four-pair-pole asymmetric design structure of multi-unit permanent magnet motor Download PDFInfo
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- CN109617350B CN109617350B CN201910033353.4A CN201910033353A CN109617350B CN 109617350 B CN109617350 B CN 109617350B CN 201910033353 A CN201910033353 A CN 201910033353A CN 109617350 B CN109617350 B CN 109617350B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a minimum unit four-pair-pole asymmetric design structure of a multi-unit permanent magnet motor, aims to reduce the cogging torque and the torque fluctuation of the motor and enable the running characteristic of the motor to be more stable, and belongs to the technical field of motor design and manufacturing. The multi-unit permanent magnet motor adopted by the invention comprises a stator and a rotor, wherein a stator winding is provided with N independent operation units, and each independent operation unit is a 3-symmetric alternating current winding; the rotor has the same pole pair number and the minimum unit pole pair number is four, the pole number of each unit is 8k, k is a positive integer k ═ 1,2,3 …, the stators of two adjacent unit motors are asymmetric, and the number of slots is not equal. The invention optimizes the cogging torque and the torque fluctuation characteristic of the motor from the structure of the motor body, does not need to research a special control strategy and manufacture a special driver, and can ensure that the motor can stably run under the existing control strategy and driver.
Description
Technical Field
The invention relates to a multi-unit permanent magnet motor, in particular to a multi-unit permanent magnet motor with an asymmetric unit motor structure, and belongs to the technical field of motor design and manufacturing.
Background
The permanent magnet synchronous motor is a synchronous motor which generates a synchronous rotating magnetic field by permanent magnet excitation, the permanent magnet is used as a rotor to generate a rotating magnetic field, a three-phase stator winding is reacted through an armature under the action of the rotating magnetic field to induce three-phase symmetrical current, at the moment, the kinetic energy of the rotor is converted into electric energy, and the permanent magnet synchronous motor is used as a generator; in addition, when three-phase symmetrical current is introduced to the stator side, the three-phase stator current generates a rotating magnetic field in the space due to the fact that the three-phase stator has a phase difference of 120 degrees in the space position, the rotor rotates under the action of electromagnetic force to move, electric energy is converted into kinetic energy at the moment, and the permanent magnet synchronous motor serves as a motor.
At present, permanent magnet synchronous motors are widely used in various fields due to their high power density and high reliability. With the requirements of special application occasions in the fields of electric propulsion, dynamic positioning and the like, the multi-unit permanent magnet motor is produced. The motor structure has high reliability and stable operation. The existing multi-unit permanent magnet motor is of a symmetrical structure, namely, each unit motor is identical in structure and convenient to control. However, this also has the disadvantage that each of the unit motor systems has the same torque ripple when operating together and the same cogging torque when unloaded. In order to optimize the motor structure, enable the motor system to run more stably and reduce the cogging torque and the torque fluctuation of the motor, the invention provides a multi-unit permanent magnet motor with an asymmetric unit motor structure.
Disclosure of Invention
The invention provides a minimum unit four-pair-pole asymmetric design structure of a multi-unit permanent magnet motor, aiming at reducing the cogging torque and the torque fluctuation of the motor and enabling the running characteristic of the motor to be more stable.
The multi-unit permanent magnet motor adopted by the invention comprises a stator and a rotor, wherein a stator winding is provided with N independent operation units, each independent operation unit is a 3-symmetric alternating current winding, and the phase number m of the multiphase multi-unit permanent magnet synchronous motor is as follows: m is 3 × N, where N is an even number greater than 3;
the rotor has the same pole pair number, the minimum unit pole pair number is four, the pole number of each unit is 8k, k is a positive integer k equal to 1,2 and 3 …, the stators of two adjacent unit motors are asymmetric, and the number of slots is not equal, wherein the number of slots of the unit i is 9k, i is an odd number, the number of slots of the unit j is 12k, and j is an even number.
The minimum unit four-pair-pole asymmetric design structure of the multi-unit permanent magnet motor means that two adjacent unit motors are asymmetric, the inside of each unit motor is symmetric, and the tooth widths of stators in each unit motor are equal to each other. The stator winding of each unit motor is a three-phase winding, and the form of the stator winding is the same as that of the traditional three-phase motor winding.
Each unit motor in the designed multi-unit permanent magnet motor structure is of a concentrated winding structure, and coils are arranged in each unit motor according to the pole slot matching structure of the unit motor.
A transition groove is arranged between two adjacent unit stators, namely the groove width of the transition groove is larger than that of the inner groove of each unit motor.
Compared with the prior art, the invention has the advantages that: the cogging torque and the torque fluctuation characteristic of the motor are optimized from the structure of the motor body, a special control strategy does not need to be researched, a special driver does not need to be manufactured, the motor can stably run under the existing control strategy and driver, and when the same control strategy is adopted, the cogging torque and the torque fluctuation of the motor with the structure are lower than those of a symmetrical structure multi-unit permanent magnet motor, and the running is more stable.
Drawings
FIG. 1 is a schematic diagram of the distribution of the windings of the whole motor of the present invention;
fig. 2 is a structural explanatory diagram of two adjacent unit motors according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
The overall structure of the multi-unit permanent magnet motor is shown in fig. 1, a stator winding of the multi-unit permanent magnet motor provided by the invention is provided with N independent operation units, each independent operation unit is a 3-symmetric alternating current winding, the phase number m of the multiphase multi-unit permanent magnet synchronous motor is that m is 3 multiplied by N, and N is an even number which is more than 3.
The designed multi-unit permanent magnet motor has the same pole pair number for each unit motor rotor, the minimum pole pair number of each unit is four (the pole number of each unit is 8k, k is a positive integer k which is 1,2 and 3 …), the stators of two adjacent units are asymmetric, and the slot numbers are unequal, wherein the slot number of the unit i is 9k (i is an odd number), and the slot number of the unit j is 12k (j is an even number).
A specific adjacent unit motor structure is shown in fig. 2, and is described by taking a minimum unit motor as an example, that is, k is 1. At this time, each unit motor has 8 poles, the number of teeth of the unit motor i is 9, and the number of teeth of the unit motor j is 12. The transition slot is located as shown in the figure, and its slot width is different from the slot width inside each unit motor. The tooth width in the i-th unit motor is different from the tooth width in the j-th unit motor.
Claims (3)
1. The utility model provides a four antipodal asymmetric design structures of minimum unit of polycell permanent-magnet machine, the polycell permanent-magnet machine who adopts includes stator and rotor, its characterized in that: the stator winding is provided with N independent operation units, each independent operation unit is a 3-phase symmetrical alternating current winding, and the phase number m of the multiphase multi-unit permanent magnet synchronous motor is as follows: m is 3 × N, where N is an even number greater than 3;
the rotor has the same pole pair number and the minimum unit pole pair number is four, the pole number of each unit is 8k, k is a positive integer k equal to 1,2 and 3 …, the stators of two adjacent unit motors are asymmetric and the slot numbers are not equal, the interior of each unit motor is symmetric, the tooth widths of each stator in each unit motor are equal, wherein the slot number of the unit i is 9k, i is an odd number, the slot number of the unit j is 12k, and j is an even number.
2. The minimum unit four-pair-pole asymmetric design structure of the multi-unit permanent magnet motor according to claim 1, characterized in that: each unit motor in the multi-unit permanent magnet motor structure is a concentrated winding structure, and coils are arranged in each unit motor according to the pole slot matching structure of the unit motor.
3. The minimum unit four-pair-pole asymmetric design structure of the multi-unit permanent magnet motor according to claim 1, characterized in that: a transition groove is arranged between two adjacent unit stators, and the groove width of the transition groove is larger than that of the inner groove of each unit motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910033353.4A CN109617350B (en) | 2019-01-14 | 2019-01-14 | Minimum unit four-pair-pole asymmetric design structure of multi-unit permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910033353.4A CN109617350B (en) | 2019-01-14 | 2019-01-14 | Minimum unit four-pair-pole asymmetric design structure of multi-unit permanent magnet motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109617350A CN109617350A (en) | 2019-04-12 |
| CN109617350B true CN109617350B (en) | 2021-03-30 |
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| CN201910033353.4A Active CN109617350B (en) | 2019-01-14 | 2019-01-14 | Minimum unit four-pair-pole asymmetric design structure of multi-unit permanent magnet motor |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4399943B2 (en) * | 2000-02-29 | 2010-01-20 | 株式会社富士通ゼネラル | Permanent magnet motor |
| US8461739B2 (en) * | 2009-09-25 | 2013-06-11 | Ford Global Technologies, Llc | Stator for an electric machine |
| JP2013219954A (en) * | 2012-04-10 | 2013-10-24 | Nippon Soken Inc | Motor |
| CN108429420B (en) * | 2018-02-26 | 2020-02-18 | 东南大学 | Asymmetric double-three-phase arc permanent magnet synchronous motor |
| CN108448854A (en) * | 2018-03-29 | 2018-08-24 | 宁波诺丁汉大学 | Frequency permanent-magnetism synchronous motor with high system |
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