Rotor Control
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United States of America Patent
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Issued Date -
Apr 10, 2014
app pub date -
Oct 9, 2013
filing date -
Oct 10, 2012
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method for controlling a motor at low operational speed is disclosed, wherein the motor comprises a magnetic rotor and a stator arranged to produce a magnetic field responsive to an applied electric current, wherein the method comprises ramping up an electric current applied to a stator from an initial current level to a synchronisation current level over a period of time. The initial current level is less than a minimum current required by the stator to produce a magnetic field having magnetic flux of a sufficient magnitude for synchronising a position of the magnetic rotor with respect to the magnetic field. The synchronisation current level is greater than or equal to the minimum current required to produce a magnetic field having magnetic flux of a sufficient magnitude to synchronise the position of the magnetic rotor with the magnetic field.
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