Sensorless control of SRM based on high frequency pulse
ZHANG Bin, YAN Gangfeng
(College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)
 

Abstract: Aiming at the problem of the higher system hardware cost and complexity, the decrease of system reliability caused by external connection of rotor position estimation used in custom SRMs, the sensorless control based on high frequency pulse injection was studied. In consideration of the difference of the chosen injecting phase, two methods which can either estimate the position of the rotor by injecting the pulses into two different nonconducting phases were presented based on the phase inductance partition method. A drive control system based on stm32 was constructed using a 12/8 pole 4 KW threephase SRM as experiment object to verify the accuracy of rotate position estimate with high frequency injection. The operation states of the motor using two kinds of detection methods respectively are observed. The results indicate that SRM system using sensorless control strategy can estimate the rotate position precisely. Combination of the two methods is ont only able to avoid reverse starting of the SRM, as well as make the rotating of the SRM more stably and efficiently.
Key words: switched reluctance motor(SRM); sensorless control; high frequency pulse; phase inductance partition