Initial rotor position estimation method of sensorless PMsynchronous motor with no sensitivity to armature resistance
Noguchi, T.; Yamada, K.; Kondo, S.; Takahashi, I.
Industrial Electronics, IEEE Transactions on
Volume 45, Issue 1, Feb 1998 Page(s):118 - 125
Digital Object Identifier 10.1109/41.661312
Summary: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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