Abstract
The switched reluctance motor (SRM) has inherently high level of fault tolerance. However despite of its high robustness and reliability it can face windings and bearings faults. The faults can cause costly downtimes in industrial environment, or they can bring about more severe consequences in safety critical applications. Therefore the detection of the faults in their incipient phase and the ability to tolerate them is a very important requirement for the electrical drive systems used in such applications. The paper deals with the most important faults of the SRMs, their effects on the machine performances and their detection. Also a reconfigurable fault tolerant control system for the SRMs is proposed, which is able to detect diverse winding faults and to mask these faults by imposing increased currents in the healthy remained coils of the machine. The fault detection capability and the correct reconfiguration of the proposed control system are proved by laboratory tests.
Highlights
IntroductionThe switched reluctance motor (SRM) is a double salient electrical machine with a passive rotor (see Figure 1)
The switched reluctance motor (SRM) is a double salient electrical machine with a passive rotor.Its stator is manufactured of punched laminations bonded into a stack
The torque is produced by the tendency of the rotor to reach a position where the inductance and the flux produced by the energized winding are maximized
Summary
The switched reluctance motor (SRM) is a double salient electrical machine with a passive rotor (see Figure 1). The control system requires rotor position information for an optimal phase excitation sequence [4, 5]. Due to their very simple construction the SRMs are robust and reliable, they. In more advanced and important systems it is important that the entire electric drive system based on a SRM to be fault tolerant [9, 10] This means that the system has to be able to self detect the fault and to act upon the control of the motor in a manner to minimize the negative effects of the fault. In the last part of the paper a reconfigurable fault tolerant control system for SRMs is proposed and tested by means of measurements
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