Fault Detection and Tolerant Capability of Parallel-Connected Permanent Magnet Machines under Stator Turn Fault
Journal
IEEE Transactions on Industry Applications
Journal Volume
54
Journal Issue
5
Pages
4447-4456
Date Issued
2018
Author(s)
Abstract
This paper analyzes the influence of stator windings turn-to-turn fault on inverter-fed permanent magnet (PM) machines. By adding a secondary neutral point (NP) in stator windings, the turn fault detection and tolerant capability can all improve considering a small turn-to-turn short at an early stage. From the perspective on fault detection, the proposed windings with two NPs increase the equipment impedance per NP. Once a turn fault occurs, the fault-induced voltage harmonic magnitude increases. It results in a better signal-to-noise ratio for the fault detection. From the perspective on tolerant drive, the fault-induced circulating currents can flow across different phase coils in the windings with two NPs. Reduced effect on circulating currents in a faulty machine is achieved due to the current diversion. Turn fault induced additional losses are then decreased compared to conventional windings with only one NP. A 1-kW PM machine with two different windings is tested to verify the fault detection and tolerant performance.
SDGs
Publisher
Institute of Electrical and Electronics Engineers Inc.
Type
journal article