文档介绍：A Position Detection Strategy for Sensorless Surface Mounted
Permanent Motors at Low Speed Using Transient Finite-
Element Analysis
Zhao Wang1, Shuangxia Niu1, S. L. Ho1, W. N. Fu1, and Jianguo Zhu2
1Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
2Faculty of Engineering and Information Technology, University of Technology, Sydney, Australia
A novel solution for sensorless starting of conventional surface mounted PM motors is proposed. The strategy of the proposed
scheme is to creatively formulate bination of ic field with transient finite element method (FEM). The proposed
solution is an improvement over and above conventional methods in that it is based on rotor position detection at zero speed with high
frequency signal injection and back EMF detection. Previous researches tend to consider the induced signal from different winding
terminals independently. The proposed methodology however exploits the induced voltage signals from two of the motor winding
terminals, using the third terminal as the signal injection point. The strategy also eliminates the process of polarity tests. The
relationship between the dependency of induced signals and the rotor position angle is summarized, and a simple motor starting
scheme is proposed. Effects arising from the transient characteristics of th