16-05-2014, 10:38 AM
Remedial Injected-Harmonic-Current Operation of Redundant Flux-Switching Permanent-Magnet Motor Drives
Remedial Injected-Harmonic.docx (Size: 13.77 KB / Downloads: 11)
Abstract:
Redundant flux-switching permanent-magnet (R-FSPM) motors are a new class of brushless machines having magnets in the stator, offering high power density, simple and robust rotor structure, and good thermal dissipation conditions. This paper proposes a new control strategy for fault-tolerant operation of the R-FSPM motor drive considering the capability limitation of the power converter. The key is to operate the R-FSPM motor in the remedial mode by injecting harmonic currents, the so-called remedial injected-harmonic-current (RIHC) operation mode. Moreover, the motor losses at the existing and the proposed remedial operations are compared for evaluation. Both co simulation and experimental results are presented, confirming that the proposed RIHC operation can offer good steady-state and dynamic performances while reducing the motor losses and the capability requirements of the power converter during fault.
Existing system:
In recent years, the development of fault-tolerant motor drives has received great attention, focusing on the switched reluctance (SR) motor and the conventional permanent-magnet (PM) brushless motor. SR motors have simple rotor construction and mechanical robustness, suitable for high-speed and high-reliability applications. Moreover, due to their decoupling phases, SR motors inherently possess the fault-tolerant characteristic. By employing the redundant winding in the conventional SR machine topology, a new dual-channel SR machine was proposed for high-reliability operation of critical applications. A new five-phase fault-tolerant SR motor drive with integrated and distributed inverter was developed for railway traction applications. On the other hand, PM brushless motors are emerging as a promising candidate for high-power-density and high-efficiency applications compared with SR motors. A number of PM motors and control strategies with different degrees of fault-tolerant capability have appeared in the literature. By employing an arrangement of alternately wound teeth in the stator, a new class of fractional-slot concentrated-winding fault-tolerant PM machines, termed as rotor-PM machines, was proposed for fault-tolerant operation.
Disadvantage:
1. This may suffer from weak mechanical structure and difficulty in PM cooling.
2. Motor losses is higher.
Proposed system:
This paper proposes a new control strategy for fault-tolerant operation of the R-FSPM motor drive considering the capability limitation of the power converter. The key is to operate the R-FSPM motor in the remedial mode by injecting harmonic currents, the so-called remedial injected-harmonic-current (RIHC) operation mode. Moreover, the motor losses at the existing and the proposed remedial operations are compared for evaluation. Both co simulation and experimental results are presented, confirming that the proposed RIHC operation can offer good steady-state and dynamic performances while reducing the motor losses and the capability requirements of the power converter during fault.