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ANSYS 2011 中国用户大会优秀论文
Design of Position Detection Strategy of Sensorless Permanent Magnet
Motors at Standstill Using Transient Finite Element Analysis
1 1 2
W. N. Fu , and S. L. Ho , and Zheng Zhang , Fellow, IEEE
1The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
2Great Lakes Electric, Stevensville, MI 49127, USA
Sensorless control of permanent magnet (PM) motors at standstill and low speed is very challenging to implement. A methodology
to design and optimize the position detection strategy of PM motors using transient finite element analysis (FEA) of magnetic field is
presented. It addresses effects arising from both the iron core saturation and the transient characteristics of signals. A combined
inductance which is sensitive to the rotor position throughout the complete cycle is proposed for the realization of position detection.
The advantage of the proposed novel algorithm is that the rotor’s position at low speeds down to standstill can be easily and robustly
detected. A two-phase PM motor with salient structure is used to serve as an example to demonstrate the method.
Index Terms—Electric motor, initial rotor position, low-speed, magnetic field, permanent magnet, sensorless control, standstill.
detected easily and robustly. It does not require three-phase to
I. INTRODUCTION two-phase coordinate transformation either.
ERMANENT MAGNET (PM) motors are being widely used by
P
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