Sample MMM manuscript for submission to AIP advances transient line starting analysis of the ultra-high speed PMSM.

Wenjie Cheng,Yanhua Sun,Ming Li,Wei Li,Lie Yu,Yongsheng Tian,Ling Xiao

doi:10.1063/1.4974057

Abstract

Aiming at the ultra high speed permanent magnet synchronous motor (PMSM) supported by gas foil bearings (GFBs), this paper calculates the transient line starting of the motor. Firstly, the start effect of the rotor composed of cylindrical PM and stainless steel sleeve is studied. Then, in order to enhance the start torque, copper ring, nickel ring and copper squirrel-cage are introduced in the rotor and their start effect are analysed, respectively. It can be found that the rotor including nickel ring can be accelerated to set speed, but all the other rotors are failed due to the higher PM and braking torques. It can be concluded that some material owning slight large relative permeability can be applied in the rotor to reduce the PM field and contribute to start by using the line-start method.

Highlights

In spite of the superior performance of the permanent magnet synchronous motor (PMSM) supported by gas foil bearings (GFBs), the start is difficult due to two factors, one is the dry friction torque from the preload GFBs, and the other is the lack of the starting winding in the rotor
It can be concluded that the induction torque minus by the generating braking torque should be comparable to the PM torque to guarantee that the rotor can be successfully pulled into the synchronous speed in a short time such as 5s
The paper studies the transient line starting of the ultra-high speed PMSM, research shows that the original, copper ring and copper bar rotors all cannot be pulled into a high synchronous speed but fluctuate at a low speed, and the rotor eddy currents are extremely vigorous

Summary

Introduction

In spite of the superior performance of the PMSM supported by GFBs, the start is difficult due to two factors, one is the dry friction torque from the preload GFBs, and the other is the lack of the starting winding in the rotor.

Results

Conclusion