Asymmetric design structure for four pairs of poles of minimum unit of multi-unit permanent magnet motor

A permanent magnet motor, the technology of the smallest unit, applied in the direction of magnetic circuit shape/style/structure, synchronous motor with stationary armature and rotating magnet, magnetic circuit, etc., to achieve smooth operation, cogging torque and torque ripple low effect

Active Publication Date: 2019-04-12
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this also brings certain disadvantages, that is, each unit motor system has the same torque ripple when running together, and the same cogging torque when no-load

Method used

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  • Asymmetric design structure for four pairs of poles of minimum unit of multi-unit permanent magnet motor
  • Asymmetric design structure for four pairs of poles of minimum unit of multi-unit permanent magnet motor

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] The overall structure of the multi-unit motor is as follows: figure 1 As shown, the stator winding of the multi-unit permanent magnet motor of the present invention has N independent operating units, and each independent operating unit is a 3-phase symmetrical AC winding, and the phase number m of the multi-phase multi-unit permanent magnet synchronous motor is: m= 3×N, where N is an even number greater than 3.

[0015] The designed multi-unit permanent magnet motor has the same number of pole pairs for each unit motor rotor and the minimum number of unit pole pairs is four (the number of poles for each unit is 8k, k is a positive integer k=1,2,3...) , the stators of two adjacent units are asymmetrical, and the number of slots is unequal. The number of slots of unit i is 9k (i is an odd number), and the number of slots of unit j is 12k (j is an even number).

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Abstract

The invention provides an asymmetric design structure for four pairs of poles of a minimum unit of a multi-unit permanent magnet motor, aims at reducing a cogging torque and torque fluctuation to ensure that the motor operation characteristic is more stable, and belongs to the technical field of motor design and manufacture. The multi-unit permanent magnet motor comprises a stator and a rotor; a stator winding comprises N independent operation units; each independent operation unit is a three-phase symmetric AC winding; the rotor has a same pole pair number and the minimum pole pair number isfour; the pole number of each unit is 8k; k is a positive integer which is equal to 1, 2, 3...; and every two adjacent units are asymmetric in the aspect of motor stator and have unequal slot numbers.According to the structure provided by the invention, the cogging torque and torque fluctuation characteristic of the motor are optimized from mechanical structure of the motor, a special control strategy does not need to be researched, and a special driver does not need to be manufactured, so that the motor is operated stably under the existing control strategy and driver.

Description

technical field [0001] 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, belonging to the technical field of motor design and manufacture. Background technique [0002] The permanent magnet synchronous motor is a synchronous motor that is excited by a permanent magnet to generate a synchronous rotating magnetic field. The permanent magnet acts as a rotor to generate a rotating magnetic field. The three-phase stator winding reacts through the armature under the action of the rotating magnetic field to induce a three-phase symmetrical current. At this time, the kinetic energy of the rotor is converted For electric energy, the permanent magnet synchronous motor is used as a generator; in addition, when the three-phase symmetrical current is passed into the stator side, since the three-phase stators have a difference of 120 degrees in space, the three-phase stator current gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K21/14H02K1/16
CPCH02K1/165H02K21/14H02K2213/03
Inventor 曾德鹏姚绪梁张强王景芳
Owner HARBIN ENG UNIV
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