Diagnosis of partial demagnetization in a multi-fault tolerant control for PMSMs

In this publication a methodology for detecting, identifying and adapting partial demagnetization in Permanent Magnet Synchronous Machines (PMSMs) is derived. The idea is the usage of a new algorithm based on curve fitting, which quantifies the asymmetry in the PMSM caused by the partial demagnetization fault. In a representative dynamic simulation it can be shown that the diagnosis in combination with the introduced multi-fault tolerant control system shows good results for detecting, identifying and compensating partial demagnetization.