Controller for permanent magnet synchronous motor, control method, and image forming apparatus
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United States of America Patent
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Nov 27, 2018
Grant Date -
May 3, 2018
app pub date -
Oct 16, 2017
filing date -
Oct 28, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for controlling a permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The method includes: presuming, based on a target speed and an estimated speed that is an estimated value of a rotational speed of the rotor, whether or not a step-out occurs; correcting, when it is presumed that a step-out occurs, an estimated angle that is an estimated value of a position of magnetic poles of the rotor; and controlling, based on a post-correction estimated angle that is the estimated angle after the correction, a current flowing through the armature to cause the rotating magnetic field rotating at the target speed.
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