Detection and classification of turn fault and high-resistance connection fault in inverter-fed permanent magnet machines based on high-frequency signals

Abstract

Winding turn fault and high-resistance connection (HRC) fault will lead to different consequences and require different mitigation actions. In this study, the differentiating features between a turn fault and HRC fault are analysed and compared in a three-phase surface-mounted permanent magnet machine fed by the inverter with pulse-width-modulation voltages. The resultant high-frequency components in both voltages and currents are utilised for the fault detection and classification based on the high-frequency impedance and ripple current, without requiring modifications to the machine or interface design. Extensive simulations show that this method is capable of fault detection and classification in both transient and steady-state operations.

Keywords

• permanent magnet machines
• fault diagnosis
• permanent magnet motors
• invertors
• high-frequency signals
• winding turn fault
• high-resistance connection fault
• different consequences
• different mitigation actions
• HRC fault
• three-phase surface-mounted permanent magnet machine
• pulse-width-modulation voltages
• resultant high-frequency components
• fault detection
• classification
• high-frequency impedance
• ripple
• inverter-fed permanent magnet machines