FPGA (field programmable gate array)-based permanent magnet synchronous motor current loop bandwidth expansion device

Abstract

The invention discloses an FPGA (field programmable gate array)-based permanent magnet synchronous motor current loop bandwidth expansion device. The device comprises a current sampling module, a Clark conversion module, a Park conversion module, a PI (proportional-integral) module, an iPark conversion module, an SVPWM (space vector pulse width modulation) module and a time sequence control module, wherein the current sampling module is used for reading current sampling values ia and ib of a phase A and a phase B; the Clark conversion module is used for converting the ia and the ib into an alpha-beta coordinate system to obtain ialpha and ibeta, the Park conversion module is used for converting the ialpha and the ibeta into a d-q coordinate system to obtain a direct axis current id and a quadrature axis current iq; the PI module is used for comparing a command current with feedback currents id and iq to obtain a current deviation value, and computing to obtain command voltages Vd and Vq in the d-axis and the q-axis; the iPark conversion module is used for converting the Vd and the Vq into an alpha-beta coordinate system to obtain Valpha and Vbeta; the SVPWM module is used for calculating a three-phase PWM duty ratio according to the Valpha and the Vbeta, and generating six paths of PWM waveforms; the time sequence control module is used for starting or closing a corresponding module according to a current control time sequence, and completing the control of the current of a permanent magnet synchronous motor. According to the device, the delay in a current control loop is greatly reduced through the optimization of a control time sequence and the design of an FPGA-based current controller, so that the bandwidth of the current loop is improved.

Description

technical field [0001] The invention belongs to the technical field of motor control, and more specifically relates to an FPGA-based permanent magnet synchronous motor current loop bandwidth expansion device. Background technique [0002] Permanent magnet synchronous motor control generally includes three control loops: position loop, speed loop and current loop. Among them, the current loop is the innermost layer of the whole system, and its control performance directly affects the response performance of the speed loop and position loop of the servo system. [0003] In the permanent magnet synchronous motor control system, the current controller first samples the motor phase current, and then calculates the reference voltage vector (V α , V β ), and finally use the SVPWM modulation method to calculate the PWM duty cycle and output the PWM wave to control the opening and closing of the IPM or IGBT to achieve the purpose of controlling the motor current. Among them, the m...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a low-delay, high-bandwidth FPGA-based permanent magnet synchronous motor current loop control method for the defects of large delay and low bandwidth of the existing permanent magnet synchronous motor current control loop

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