Permanent magnet synchronous motor vibration noise active suppression method

Abstract

The invention discloses a permanent magnet synchronous motor vibration noise active suppression method, which is based on a DSP + FPGA embedded control system architecture. On the basis that a DSP timer is interrupted to complete sampling processing and closed-loop control and obtain a modulation degree and an angle real-time instruction, an angle jump quantity between adjacent sampling points isextracted, and an angle stepping value is calculated by adopting a virtual high-frequency method; a modulation instruction is sent to an FPGA through a high-speed data bus, the amplitude of a modulation wave in a control period is equivalently linearized and stepped to an instruction value by utilizing high running speed of the FPGA, reliable zero clearing of a counter and a stepper cache is guaranteed through clock synchronization, a smooth modulation wave is generated and compared with a triangular carrier, and then a PWM pulse is output; and a driving inverter converts a direct-current busvoltage into a three-phase alternating-current voltage to drive a motor to operate, so that multi-sampling fine control of key variables is realized, the variable updating frequency and the control precision are remarkably improved, the variable jump is avoided, and the torque ripple and the electromagnetic vibration noise of the motor are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of AC motor vibration control, in particular to a method for suppressing high-frequency vibration and noise of a digital controller of a ship permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have the advantages of high power density, simple mechanical structure, high efficiency in the full speed range, and high torque output ratio. They have been widely used in major equipment such as energy power, transportation, and high-end manufacturing. With the widespread application of permanent magnet motors, its vibration and noise characteristics have attracted more and more attention. Among them, high-end applications such as ship propulsion, high-precision servo and electric vehicles have extremely urgent needs for low-vibration and noise motor systems. [0003] The vibration and noise source of permanent magnet synchronous motor is mainly composed of three pa...

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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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