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The paper deals with various sensorless techniques for SRM. The theory of most these techniques is described and their advantages and disadvantages are discussed. Simulation of a SRM traction drive for an electric vehicle was created and experimentally verified. A selected method is simulated on the base of a real SRM for various operating range and conditions. The method is analyzed from the point...
This paper describes the soft start and grid connection control strategies for high power synchronous compensator fed by low-voltage load-commutated inverters (LCI). In the start-up stage, field weakening method is used to make the motor start stably, and the back electromotive force (EMF) basically remain stable within the LCI withstand voltage at the same time. When the motor speed up to above the...
This paper investigates a novel rotor configuration of a permanent-magnet synchronous machine (PMSM) in which a saliency modulation rotor end is added to the machine rotor to improve the self-sensing capability. The saliency-based self-sensing control method is widely adopted for position estimation at stand-still and low speed range. However, the performance is heavily affected by saturation effects...
This paper introduces the working principle and mathematical model of the servo electric load simulator, and puts forward a kind of intelligent controller based on improved wavelet neural network. Bang-Bang controller is used when the error is over the threshold, improved wavelet neural network and fuzzy compensation controller is used when the error is below the threshold; Considering the computational...
Based on the analysis of compressor load behaviors, a new three-phase startup strategy for permanent magnet synchronous motor (PMSM) compressor is presented, which includes parking, open-loop startup and closed-loop operation. When the speed loop closes, an improved method of flux estimation for PMSM compressor sensorless control is proposed, which accomplishes parking, efficient speed estimation...
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