Rotor Position Detection Algorithm with Mechanical Load Asymmetric Error Determination Ability in SR Motor Drive
Subject Areas : electrical and computer engineeringE. Khiabani 1 , H. Moradi Cheshmeh-Beigi 2 *
1 - Razi University
2 - Razi University
Abstract :
This paper introduces a new sensorless rotor position detection technique with the mechanical load asymmetric error determines ability for switched reluctance motor drives. In presented paper combination of pulse injection technique and digital pulse position modulation are employed for control of SR motor. In this method, a single high-frequency pulse is injected in an idle phase to determine the rotor position and estimates the rotor position through analysis of the resultant current after voltage pulse injection. Since the number of injected pulses is constant, in terms of the proper functioning of the motor, output bit stream has a fixed length and is proportional to the mechanical load torque. In the event of mechanical failure as a result of fluctuations in the mechanical load, the number of bits according to the error rate will change, which counts the number of output bits detection circuit , errors in mechanical load is determined. Proposed method decrease the injuries caused by asymmetry error in mechanical load connected to the motor shaft. The proposed sensorless method has been simulated using Matlab-Simulink and implemented on an experimental setup in real time to validate its performance. The results obtained demonstrate the feasibility and practicability of the method.
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