Initial rotor position estimation method of sensorless PMsynchronous motor with no sensitivity to armature resistance
Noguchi, T.
Yamada, K.
Kondo, S.
Takahashi, I.
Dept. of Electr. & Electron. Syst. Eng., Nagaoka Univ. of Technol., Niigata;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb 1998
Volume: 45,
Issue: 1
On page(s): 118-125
ISSN: 0278-0046
References Cited: 8
CODEN: ITIED6
INSPEC Accession Number: 5830871
Digital Object Identifier: 10.1109/41.661312
Current Version Published: 2002-08-06
Abstract
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
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