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Initial rotor position estimation method of sensorless PM synchronous motor with no sensitivity to armature resistance

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4 Author(s)
Noguchi, T. ; Dept. of Electr. & Electron. Syst. Eng., Nagaoka Univ. of Technol., Niigata, Japan ; Yamada, K. ; Kondo, S. ; Takahashi, I.

This paper proposes a new initial rotor position estimation method of a sensorless permanent magnet (PM) synchronous motor at starting condition, which has no sensitivity to the armature resistance. The method is based on saliency of the rotor and employs the alternating magnetic field which is excited by a current controller. The phase differences between the magnetizing current references and the voltage references make it possible to estimate the rotor direction accurately without motor parameters, except the ratio of direct axis and quadrature axis inductance. Also, the magnetic pole is evidently identified by detecting the voltage reference oscillation phenomena caused by magnetic saturation, which can be performed without motor parameters. The experimental result has proven that the estimation error was within -4.5 to +2.5 mechanical degrees, even though the armature resistance varied to 125% of the nominal value

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:45 ,  Issue: 1 )

Date of Publication:

Feb 1998

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