IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Letter
Position-and Velocity- Sensorless Control of Cylindrical Brushless DC Motors Driven by Sinusoidal Current at Low Speed Using Eddy Current
Hiroshi TakashimaMutuwo TomitaZhiqian ChenMitsuhiko SatohShinji DokiShigeru Okuma
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2003 Volume 123 Issue 6 Pages 762-763

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Abstract
This paper proposes to paste non-magnetic materials on the rotor surface of a cylindrical brushless DC motor and to use the model including the extended e.m.f. for sensorless control. In the proposed method, the inductance changes depending on the rotor position because of eddy currents, which flow on the non-magnetic material at high frequency. The rotor position can be estimated at standstill and at low speeds. The simulation results show that the proposed method is very useful.
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© 2003 by the Institute of Electrical Engineers of Japan
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