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Permanent-magnet synchronous motor torque ripple suppression method based on coordinate transformation harmonic compensation

A permanent magnet synchronous motor and harmonic compensation technology, which is applied in electronic commutation motor control, motor generator control, AC motor control, etc., can solve high output harmonic content, poor real-time control performance, large torque ripple, etc. question

Active Publication Date: 2015-08-19
LEADRIVE TECH (SHANGHAI) CO LTD +1
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AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a coordinate-based Transform harmonic compensation permanent magnet synchronous motor torque ripple suppression method, by decomposing and suppressing current harmonics under harmonic coordinate transformation, to improve motor control effect and reduce torque ripple

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  • Permanent-magnet synchronous motor torque ripple suppression method based on coordinate transformation harmonic compensation
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  • Permanent-magnet synchronous motor torque ripple suppression method based on coordinate transformation harmonic compensation

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Embodiment Construction

[0048] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0049] For the convenience of description, the symbolic variables are defined as follows:

[0050] Symbol definition:

[0051] i a ——Phase A permanent magnet synchronous motor current (A)

[0052] i b ——Phase B permanent magnet synchronous motor current (A)

[0053] i c ——C phase permanent magnet synchronous motor current (A)

[0054] i α ——The α-axis current component in the stationary coordinate system of the stator (A)

[0055] i β ——beta-axis current component in the stationary coordinate system of the stator (A)

[0056] i d ——d-axis current component in the rotating c...

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Abstract

The invention relates to a permanent-magnet synchronous motor torque ripple suppression method based on coordinate transformation harmonic compensation. Three-phase current is acquired and converted into stator current in a two-phase static coordinate system; the stator current in the two-phase static coordinate system is transformed to fifth, seventh, eleventh and thirteenth harmonic rotating coordinate systems; direct-current component is extracted from fifth, seventh, eleventh and thirteenth harmonic current in the corresponding coordinate systems through a low-pass filter; a second-order low-pass digital filter based on speed adaptation is designed to extract harmonic of a specific order; and on the basis, a proportional integral current controller with cross coupling is designed to complete harmonic current suppression ultimately, thus suppressing torque ripple. Compared with the prior art, the harmonic content of output current can be reduced, and torque ripple, vibration noise and other negative effects of a permanent-magnet synchronous motor for electric vehicles can be reduced on the basis of permanent-magnet synchronous motor vector control.

Description

technical field [0001] The invention relates to the field of vector control of permanent magnet synchronous motors for electric vehicles, in particular to a method for suppressing torque ripple of permanent magnet synchronous motors based on coordinate transformation harmonic compensation. Background technique [0002] The existence of torque ripple affects the low-speed performance of the motor in the speed control system and the high-precision positioning in the position control system, which will cause system vibration and noise, and even threaten the safety of the system when it is serious. torque ripple. The methods to reduce torque ripple are mainly divided into: chute method, repetitive control, torque feedback control and multi-synchronous coordinate system harmonic injection method. [0003] 1) Chute method [0004] Stator skew or rotor skew is one of the most effective and widely used methods to suppress cogging torque ripple. This method is mainly used for moto...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P25/02
Inventor 康劲松王硕崔宇航
Owner LEADRIVE TECH (SHANGHAI) CO LTD
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