A method for active suppression of vibration and noise of permanent magnet synchronous motor

Abstract

The invention discloses a method for actively suppressing the vibration noise of a permanent magnet synchronous motor. Based on the DSP+FPGA embedded control system architecture, the DSP timer is interrupted to complete the sampling process and closed-loop control and obtain the modulation degree and angle real-time instructions. For the angle jump variable between adjacent sampling points, the virtual high-frequency method is used to calculate the angle step value, and the modulation command is sent to the FPGA through the high-speed data bus. Taking advantage of its fast operation speed, the modulation amplitude value in one control cycle, etc. Efficiently linearize stepping to the command value, and use clock synchronization to ensure the reliable clearing of the counter and stepper buffer, and then generate a smooth modulation wave and compare it with the triangular carrier wave to output PWM pulses to drive the inverter to convert the DC bus voltage into The three-phase AC voltage drives the motor to run, thereby realizing the multi-sampling fine-grained control of key variables, significantly improving the variable update frequency and control accuracy, avoiding variable jumps, and effectively improving the torque ripple and electromagnetic vibration noise of the motor.

Description

A method for active suppression of vibration and noise of permanent magnet synchronous motor technical field The invention belongs to the alternating current motor vibration control technical field, particularly a kind of ship permanent magnet synchronous motor digital control The method of suppressing high frequency vibration noise of the controller. Background technique Permanent magnet synchronous motor has the advantages of high power density, simple mechanical structure, high efficiency in the whole speed regulation range and torque output. It has the advantages of high ratio and has been widely used in major equipment such as energy power, transportation, and high-end manufacturing. With the wide range of permanent magnet motors It is widely used, and its vibration and noise characteristics have attracted more and more attention. Among them, ship propulsion, high-precision servo and electric vehicles, etc. High-end applications have an extremely urgent need f...

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Problems solved by technology

[0006] Patent Document 3 (CN105577059B) discloses a noise suppression method for a marine asynchronous motor system, which calculates the electromagnetic torque ripple of a three-phase motor under different loads and different speeds offline, draws q curves, and performs online closed-loop control of the motor At this time, the theoretical value of electromagnetic torque ripple under the current speed and load is calculated, and compared with the actual value of electromagnetic torque ripple of the current motor, and the output voltage compensation value is compared through the PI regulator, but this method has a curve fitting function Complex so that digital implementation is difficult and low-pass filtering leads to loss of high-frequency information and other issues

[0007] From the perspective of discrete control of embedded digital controllers, DSP, MCU or FPGA are commonly used in the field of variable frequency motor drive. Taking TIC2000 series DSP as an example, due to the need to deal with sampling, PID control, protection and other links, the main frequency and switching frequency of the controller must be Satisfy a certain ratio, and the timer interrupt requires a certain execution time. With the increase of the switching frequency, it is basically impossible to use cycle-by-cycle adjustment when the switching frequency is above tens of kHz. Therefore, it takes several switching cycles to complete a control cycle at high frequencies. , digital delay caused by multi-cycle adjustment makes it difficult to design a high-bandwidth controller. Although the switching frequency has been increased, the dynamic performance has not reached the same level, and at the same time it has brought problems such as zero-crossing distortion and variable jumps. The controller does not take care of the processing or compensation, resulting in torque ripple at the control frequency

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