Abstract
Winding short-circuit is one of the more common faults in switched reluctance motors (SRM). This paper takes an in-depth look at winding short-circuit. The characteristic of non-sinusoidal intermittent single phase current, fundamental components are extracted to reconstruct four phase symmetrical currents based on spectrum analysis of phase currents. The method of symmetrical component is used to calculate positive and negative sequence components of reconstructed currents, where then the ratio between positive and negative sequence component is seen as a fault feature and the diagnostic criterion is proposed. The simulation and experimental results are presented to confirm the implementation of the proposed method.
Highlights
For switched reluctance motor (SRM), neither windings nor permanent magnets are on the rotors, all windings are located on the stators
The follow views can be seen: (1) Magnitudes, both positive and negative sequence component of reconstructed current when the motor is with winding short-circuit fault, are all higher than those that the motor is normal with the same speed and load
(3) Under the current control mode, there is no difference between faulted phase current and normal phase current, but under the voltage control mode, the magnitude of the faulted phase current is higher than the amplitude of the normal phase current
Summary
For switched reluctance motor (SRM), neither windings nor permanent magnets are on the rotors, all windings are located on the stators. The current in shorted circuit windings can cause a higher temperature, which further damages the insulation system[3]. Under this condition, the fault becomes more serious and will have a worsening effect on the operation of motor. L. Xiao et al.: A New Diagnostic Method for Winding Short-Circuit Fault for SRM Based on Symmetrical Component Analysis 75 four phase symmetrical currents. A new idea, that calculating the ratio of positive and negative sequence component as the fault feature to diagnosis the winding short circuit, is presented for SRM in this paper. It is the demonstrated that the proposed method is effective and highly reliable from results of simulations and experiments with different speed, load and shorted turn conditions
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