Method for extracting high-frequency current signals through permanent-magnet motor pulse vibration injection method

Abstract

The invention relates to a permanent-magnet motor speed adjustment technology and in particular to a method for extracting high-frequency current signals through a permanent-magnet motor pulse vibration injection method. According to the method, a band-pass filter is replaced by a pure delay link on the basis of the traditional high-frequency current signal extraction process, so that high-frequency current signals are prevented from phase lag and amplitude attenuation while high-frequency current is correctly extracted. On the basis, a DSP program realization method of the pure delay link isimproved to decrease the delay time of filter processing. Simulation and test results prove that the method is capable of correctly extracting high-frequency current signals under the condition that the torque current change is relatively large, and is beneficial for improving the high-frequency current signal processing speed. The method is capable of correctly extracting high-frequency current for rotor angle identification under the condition that the torque current change rate is relatively large so as to realize specific working condition such as speed sensor-less control under large-torque starting of permanent-magnet motors.

Description

technical field [0001] The invention belongs to the technical field of speed regulation of permanent magnet motors, and in particular relates to a method for extracting high-frequency current signals of permanent magnet motors using a pulse vibration injection method. Background technique [0002] Permanent magnet synchronous motors have high power factor and power density, fast dynamic response, and reliable performance. They are widely used in many fields such as electric vehicles, ship drives, and industrial automation. The permanent magnet motor speed sensorless speed control system reduces the cost of the speed control system, expands the scope of application, reduces the workload of system maintenance, and improves the reliability and adaptability of the system. It is highly valued by academic and engineering circles at home and abroad. [0003] The sensorless speed regulation technology of permanent magnet motors has developed rapidly, and related products are widely ...

AI Technical Summary

Problems solved by technology

During these processes, the following factors may interfere with the high frequency current i qh Generation and extraction: ① Larger basic current i q0 ;② Larger i q0 Rate of change; ③ More iq detection noise / error; ④ Current distortion caused by nonlinear factors (dead zone, motor saturation); ⑤ In the case of high current, the same Uh may not be able to stimulate a larger i qh

Therefore, to accurately extract the high-frequency current i qh more difficult

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