Author(s)

Mai Liu

Corresponding Author

Mai Liu

Abstract

With the increasing demand for energy and awareness of environmental protection, the development of green economy has become the consensus of the whole society. New energy vehicle is playing an increasingly important role in the fast-growing automotive industry. Permanent magnet synchronous motor (PMSM) in new energy vehicle, especially electric vehicle in a wide range of applications. Rotor eccentricity faults are one of the common faults of PMSM. Based on the analysis of structure and rotor eccentric fault forms, the main influence of rotor eccentricity on PMSM is analyzed. The rotor eccentricity causes air gap magnetic density to change non-uniformly, resulting in an unbalanced magnetic pull. It further causes motor failures such as vibration, noise, increased losses, and mechanical damage. Generally, the motor cannot automatically return from the eccentric state to the non-eccentric state. Therefore, it is necessary to research the detection and diagnosis of rotor eccentricity fault, in order to find and take effective measures to prevent the increase of eccentricity.

Keywords

Permanent magnet synchronous motor, static eccentricity, dynamic eccentricity, hybrid eccentricity, unbalanced magnetic pull force