Permanent magnet synchronous motor maximum torque per ampere control method based on parameter self-correction

Abstract

The invention discloses a permanent magnet synchronous motor maximum torque per ampere control method based on parameter self-correction. Real-time estimation is carried out on change condition of motor parameters (permanent magnet flux linkage, d-axis inductance and q-axis inductance) through utilization of a feedforward compensation control module; further online correction is carried out on themotor parameters in a torque equation; an electromagnetic torque model comprising accurate motor parameter information is obtained; a torque to current angle change rate is directly solved through utilization of the model; further an MTPA (Maximum Torque Per Ampere) angle is computed; and precise maximum torque per ampere control is realized. When motor operation condition is changed, according to the method, the MTPA angle can be directly solved through mathematical operation, so influence of system bandwidths does not need to be taken into consideration; an algorithm simple; computing speedis fast; dynamic performance is relatively good; a motor is enabled to work at the maximum torque per ampere operation point all the time; influence of the operation condition and motor parameter change is avoided; and relatively good parameter robustness and dynamic response characteristic are achieved.

Description

technical field [0001] The invention relates to a method for controlling the maximum torque current ratio of a permanent magnet synchronous motor. In particular, it relates to a method for controlling the maximum torque-to-current ratio of a permanent magnet synchronous motor based on parameter self-correction. Background technique [0002] The built-in permanent magnet synchronous motor has the advantages of high efficiency, high power density, simple and compact structure, and reliable operation. With the development of power electronic devices, it is widely used in electric vehicles, new energy power generation, and industrial servo drives. Because the permanent magnet of the built-in permanent magnet synchronous motor is embedded in the rotor, its q-axis inductance is significantly larger than the d-axis inductance, which causes the motor to generate reluctance torque. In order to make full use of the reluctance torque and improve the operating efficiency of the system,...

AI Technical Summary

Problems solved by technology

However, the algorithm of this method is complicated, and a large number of filters are used, which affects the system bandwidth, and the signal analysis process is complicated, and the dynamic response is poor.

Images