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Torque ripple suppression method for permanent magnet synchronous motor injected with harmonic current

A permanent magnet synchronous motor and harmonic current technology, which is applied in the direction of motor generator control, electronic commutation motor control, control generator, etc., can solve the problems of ignoring phase changes, not considering the influence of flux linkage harmonics, calculation errors, etc.

Active Publication Date: 2020-11-17
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, there is a common problem in many current methods, that is, the influence of flux linkage harmonics is not considered, and the harmonic current is simply controlled to 0, or only the amplitude of flux linkage harmonics is considered and the phase change is ignored. brought calculation error

Method used

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  • Torque ripple suppression method for permanent magnet synchronous motor injected with harmonic current
  • Torque ripple suppression method for permanent magnet synchronous motor injected with harmonic current
  • Torque ripple suppression method for permanent magnet synchronous motor injected with harmonic current

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Embodiment Construction

[0042] The present invention will be further explained below in conjunction with the drawings.

[0043] Such as figure 1 A torque ripple suppression system for permanent magnet synchronous motors based on harmonic current injection is shown. The suppression system includes: an optimal harmonic current acquisition unit, a three-phase inverter, a space vector pulse width modulation unit, and a built-in permanent magnet Synchronous motor, photoelectric encoder unit, speed regulator (PI controller), three-phase static-two-phase static coordinate conversion unit, two-phase static-two-phase rotating coordinate conversion unit, two-phase rotation-two-phase static coordinate conversion unit, Fundamental current regulator (PI controller), low-pass filter, band-pass filter, harmonic current regulator (PR controller).

[0044] The specific implementation of suppressing the k-th harmonic torque includes the following steps:

[0045] Step S1: Drag the target motor with the prime mover, and run ...

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Abstract

The invention provides a torque ripple suppression method for a permanent magnet synchronous motor injected with harmonic current. The method comprises the steps of constructing a single electric period sequence model of harmonic flux linkage and harmonic current, further deriving a torque sequence model containing k-th harmonic torque, establishing a target function with a minimum torque peak-to-peak value as a target, optimizing the target function by adopting a genetic algorithm, solving the optimal harmonic current, taking the optimal solution as a reference value of the harmonic current,and respectively controlling the fundamental current and harmonic current tracking reference values, thereby suppressing the torque ripple. According to the method, the single electric period sequencemodel of the harmonic flux linkage and the harmonic current is constructed, the torque sequence model containing the k-th harmonic torque is derived, the influence of the flux linkage harmonic amplitude and phase is comprehensively considered, the actual waveform of the torque in one electric period is fitted, and the result is real and reliable; and by introducing a genetic algorithm, the robustness is high, the global optimal solution of the harmonic current under the current working condition can be quickly solved, and the convergence is very good.

Description

Technical field [0001] The invention relates to the technical field of permanent magnet synchronous motors, and mainly relates to a method for suppressing torque pulsation of a permanent magnet synchronous motor by injecting harmonic currents. Background technique [0002] Permanent magnet synchronous motors have the advantages of small size, high power factor, high efficiency, wide speed range and reliable operation. Therefore, they are widely used in aerospace, high-precision CNC machine tools, robots, electric vehicle drives and other fields. [0003] However, in the permanent magnet synchronous motor drive system, the motor often has a large torque ripple, and the existence of air gap magnetic flux harmonics is one of the main reasons. Although the main structure of the motor can be optimized, the torque ripple can be reduced by means of stator skew or rotor slanted pole, optimizing motor winding type, optimizing stator and rotor magnetic circuit, etc., but due to manufacturing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/05H02P21/22H02P6/182
CPCH02P21/05H02P21/22H02P6/182
Inventor 郭鸿浩曹睿林欣欣向思明郭前岗
Owner NANJING UNIV OF POSTS & TELECOMM
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