Optimal torque angle control system of built-in permanent magnet synchronous motor

Abstract

The invention discloses an optimal torque angle control system of a built-in permanent magnet synchronous motor. A difference value obtained after comparison of a motor rotating speed and a given rotating speed is input to a rotating speed loop control module to obtain given current i<q phi><*>, the given current i<q phi><*> is input to a phi controller, the phi controller outputs an optimal torque angle phi, a new rotor position angle theta' is obtained by adding the optimal torque angle phi and a motor rotor position angle, and the new rotor position angle theta' is input to a 2r / 2s coordinate transformation module and a 2s / 2r coordinate transformation module. The phi controller is composed of a band-pass filter, a low-pass filter and an integral controller, a high-frequency signal is input to the phi controller, and then the given current i<q phi><*> contains a high-frequency signal delta<phi>. The optimal torque angle is obtained by inputting the high-frequency signal under the control condition that d-axis given current is zero, the optimal torque angle is compensated to the position angle to obtain maximum electromagnetic torque without the influence of operation conditions and motor parameters, and high robustness and dynamic performance are achieved.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a control system for an optimal torque angle of an internal permanent magnet synchronous motor (IPMSM), which is particularly suitable for application occasions such as permanent magnet synchronous motors of electric vehicles that require quick start. Background technique [0002] Vehicle drive motor is one of the key executive components of electric vehicles, and its driving performance directly affects the overall performance of electric vehicles. Built-in permanent magnet synchronous motors are widely used in the field of electric vehicles due to their advantages such as high efficiency, high torque density, and high power density. Due to the unequal inductance of the d and q axes of the built-in permanent magnet synchronous motor, the output electromagnetic torque includes two parts: excitation torque and reluctance torque. Conventional d-axis current i d = 0 contro...

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to solve the problem of poor control accuracy of the existing permanent magnet synchronous motor in the use of the maximum torque current ratio control strategy, and to propose a built-in permanent magnet synchronous motor with high control accuracy Optimum torque angle control The system can obtain the optimal torque angle under the control condition that the d-axis current is zero, and can change the optimal torque angle in real time as the motor parameters change

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