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Method and system for suppressing high-frequency PWM vibration of multiple three-phase permanent magnet synchronous motors

A permanent magnet synchronous motor, vibration suppression technology, applied in the direction of suppressing motor vibration control, control system, AC motor control, etc., can solve the problem of suppressing high-frequency PWM vibration of multiple three-phase permanent magnet synchronous motors

Active Publication Date: 2021-09-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the above defects or improvement needs of the prior art, the present invention provides a multi-three-phase permanent magnet synchronous motor high-frequency PWM vibration suppression method and system to solve the problem that the prior art cannot be used without relying on the common slot design of the windings. Technical Problems of Suppressing High Frequency PWM Vibration of Multiple Three-phase Permanent Magnet Synchronous Motors

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  • Method and system for suppressing high-frequency PWM vibration of multiple three-phase permanent magnet synchronous motors
  • Method and system for suppressing high-frequency PWM vibration of multiple three-phase permanent magnet synchronous motors
  • Method and system for suppressing high-frequency PWM vibration of multiple three-phase permanent magnet synchronous motors

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Embodiment 1

[0042] A multi-three-phase permanent magnet synchronous motor high-frequency PWM vibration suppression method;

[0043] Among them, the multi-three-phase permanent magnet synchronous motor includes: N sets of three-phase windings; each set of three-phase windings is arranged sequentially along the circumference of the stator; each set of three-phase windings is independently controlled by the corresponding inverter; N is an even number; Each set of three-phase windings is rotationally symmetrical about the center of the stator, and two adjacent sets of three-phase windings are only coupled at the stator teeth between them; each set of three-phase windings is connected to the corresponding inverter, and each inverter The inverters are independent of each other in control, and are controlled by PWM modulation algorithm;

[0044] The invention considers the vibration generated by the high-frequency radial electromagnetic force acting on the stator, and changes the spatial order o...

Embodiment 2

[0107] A multi-three-phase permanent magnet synchronous motor high-frequency PWM vibration suppression system, including:

[0108] The reference frequency acquisition module is used to select the frequency with the smallest difference from the 0-order natural frequency of the motor from the frequency of the high-frequency electromagnetic force generated by PWM modulation in the motor, and record it as the reference frequency;

[0109] The spatial order acquisition module is used to filter out the natural frequency with the largest difference from the reference frequency from the natural frequencies of each order of the motor, and obtain the order s corresponding to the natural frequency with the largest difference;

[0110] The order transformation control module is used to change the current harmonic phase generated by PWM modulation in each set of three-phase windings by adjusting the carrier phase of each inverter, so as to transform the 0-order high-frequency electromagneti...

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Abstract

The invention discloses a method and system for suppressing high-frequency PWM vibration of multiple three-phase permanent magnet synchronous motors. The method comprises the following steps: S1, screening out the frequency with the minimum difference from the zero-order inherent frequency of a motor from the frequencies of high-frequency electromagnetic force generated by PWM modulation in the motor, and recording the frequency as a reference frequency; S2, screening out the inherent frequency with the maximum difference from the reference frequency from the inherent frequencies of all orders of the motor, and obtaining the order s corresponding to the inherent frequency with the maximum difference; and S3, adjusting the carrier phase of each inverter, changing the current harmonic phase generated by PWM modulation in each three-phase winding, and converting the 0-order high-frequency electromagnetic force in the air gap of the motor into the s-order high-frequency electromagnetic force so as to suppress the vibration of the multiple three-phase permanent magnet synchronous motors. According to the invention, vibration is suppressed only from the angle of a PWM modulation algorithm, the hardware cost is not increased, proper carrier phase adjustment angles can be set for different switching frequencies to reasonably change the space order of the high-frequency electromagnetic force, and effective suppression of the high-frequency vibration of the motor is realized.

Description

technical field [0001] The invention belongs to the field of motor vibration suppression, and more specifically relates to a high-frequency PWM vibration suppression method and system for multi-three-phase permanent magnet synchronous motors. Background technique [0002] Permanent magnet synchronous motors have the advantages of high power density and high efficiency, and are widely used in new energy vehicles, aerospace and other occasions. [0003] The stator has multiple three-phase permanent magnet synchronous motors with multiple sets of three-phase windings, which has the advantages of low torque ripple and high degree of control freedom, and can realize phase loss fault-tolerant operation with high reliability. It is used in places such as ship propulsion that require high motor reliability. [0004] For a motor powered by an inverter powered by PWM, when the switching device in the inverter is working, a high-frequency harmonic current with a multiplied switching f...

Claims

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Application Information

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IPC IPC(8): H02P23/04H02P25/022H02P25/22H02P27/08
CPCH02P23/04H02P25/022H02P25/22H02P27/085
Inventor 刘自程闫涉王启元蒋栋
Owner HUAZHONG UNIV OF SCI & TECH
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