Sensorless Control Of PMSM Based On High Frequency Pulsating Signal Injection

Permanent magnet synchronous motors(PMSMs) are widely used in the fields of industry, health care, civil applications and national defence thanks to their various advantages such as high efficiency, high power density and high reliability. However, mechanical position sensors coaxially installed in PMSMs have increased the cost and complexicity of the motor drive system and largely limited the applications of PMSM. In order to solve the problems caused by position sensors, sensorless control methods of PMSM have been proposed and have quickly drawn close attention of researchers.This paper studied the sensorless control of PMSM based on high pulsating voltage signal injection method.A brief introduction of the development history of PMSM and its control strategy was firstly presented, in which the presentation of current sensorless control methods was highlighted.Following the introduction of related technology background, the mathematical model of PMSM was built and the theoretical analysis and simulation study of vector control were completed. Based on the mathematical PMSM model, the equivalent high frequency signal model of PMSM was derived, and the theoretical analysis and simulation study of senorless control of PMSM based on high frequency pulsating voltage signal injection method were later on completed.Afterwards, a position estimation error analysis theory based on high frequency pulsating voltage harmonic analysis was proposed, by the simulation and numerical analysis study of which, the principle of system parameters’ influences on position estimation error was concluded.In the end, a PMSM sensorless drive system using high frequency pulsating voltage signal injection method based on real time simulator was built, and the system software and hardward design was presented. Experiments of vector control, sensorless control and position estimation error analysis were conducted successively on the above-mentioned system and the validity of related theorical analyses and simulation studies was therefore proved.