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Abstract
The paper describes winding failures in Permanent Magnet Synchronous Motor (PMSM) which are preferred in Electric Vehicles. Drive can be designed with fault tolerance to continue to operate under occurrence of faults. Winding insulation failure is responsible for some of the most serious faults. A method for detecting open circuit of winding, short circuit of winding or turn to turn short circuit in winding may result as a failure of winding insulation is presented. Further a technique for continued post-fault operation of the drive is discussed based upon mathematical model. The detection method operates in real time without the use of additional sensors and is sensitive enough to detect the presence of an air-gap between turns.
Highlights
Fault tolerant drive has become essential many critical applications
This paper focuses on a balanced three-phase Surface Mounted PMSM (SPMSM) with star connected stator winding, which is one of the most common Permanent Magnet Synchronous Motor (PMSM) configurations
The results show that by measuring stator ripple current, it is possible to detect winding open circuits and short circuits
Summary
Fault tolerant drive has become essential many critical applications. Many researchers have contributed on fault tolerant operation of PMSM. Failures occurring within one or more machine phases due to the breakdown of winding insulation are one possible failure that has not been adequately covered to date. These faults are most among all other types of faults. Electric motors are exposed to the adverse conditions of heat and vibrations This may cause the progressive deterioration and eventual failure of stator winding insulation which is a major cause of failure of motor [4]. Much work exits on the causes and effects of shorted turns in machine windings [5,6,7]. Some work has been done to develop techniques for detecting shorted turns.
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