Analysis of Shaft Voltage in Rotor Permanent Magnet Synchronous Motor System for Traction

Rotor permanent magnet motor is the most common permanent magnet motor. Permanent magnet motor is widely used in traction system because of its high efficiency, high power factor and small volume. The shaft voltage is one of the main reasons for bearing failure. Common mode voltage is one of the most important reasons for the generation of shaft voltage. In this paper, the influence of common mode voltage on the shaft voltage of IPM and SPM motors is studied, the shaft voltage analysis model is established, and the influence of coupling capacitance on the shaft voltage is discussed. The results provide reference for the design of motor and the suppression of shaft voltage.