Amorphous Long Stator Core Loss Calculation of Linear Motor Based on An Improved Calculation Model

The core loss of linear motor for high-speed maglev train increase the temperature rise and affect the operation performance of the motor. Therefore, it’s necessary to accurately calculate the core loss. Because of the high operation frequency of the linear motor of the high-speed maglev train, the application of Bertotti core loss separation trinomial model is limited. In this paper, an improved separation trinomial model is adapted to calculate the long stator core loss of linear motor. Firstly, the distribution of magnetic density in each part of the long stator is analyzed, and the rationality of applying the improved calculation model to linear motor is determined. Secondly, the Bertotti trinomial model and improved trinomial model are adapted to calculate the long stator core loss of linear motor. Finally, the results calculated by the two models are verified by finite element. The results show that the calculation accuracy of the improved trinomial model meets the needs of engineering.

I. Introduction

The Electromagnetic Suspension (EMS) type high-speed maglev train has a broad development prospect in the field of rail transportation due to its advantages such as high operating speed, low operating noise and low mechanical loss [1]. However, when the train operates stably at high speed of 600km/h, the long stator iron loss of the high-speed maglev linear motor increases greatly. On the one hand, this part of energy loss reduces the operating efficiency of the high-speed maglev linear motor to a certain extent; on the other hand, it increases the temperature rise of the motor, thus affecting the operating performance of the motor, posing a higher challenge to the reliability of the motor [2] - [3]. Therefore, it’s necessary to reduce the iron loss by modifying the core material of the long stator.