Controlling method and device for permanent magnet synchronous motor
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United States of America Patent
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-
Apr 10, 1990
Grant Date -
N/A
app pub date -
Nov 14, 1988
filing date -
Nov 14, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A controlling device for a permanent magnet synchronous motor wherein a permanent magnet is used as a rotor and which includes three-phase armature windings comprises a detecting means for detecting a rotational position and a rotational angle of said rotor, a comparison means for comparing the rotational speed detected by said cetecting means with a predetermined reference speed and for developing a value of a difference between the rotational speed and the reference speed, a converting means for determining currents to be supplied individually to said armature windings in response to a vector value obtained from the rotational position detected by said detecting means and the value of the difference delivered from said comparison means, and a current controlling means for controlling current flows through said individual armature windings in response to values obtained by said converting means.
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