PMSM rotor angle identification
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United States of America Patent
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Jul 19, 2016
Grant Date -
Jun 18, 2015
app pub date -
Nov 10, 2014
filing date -
Dec 16, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and a control device for identifying the angle and polarity of the rotor of a permanent magnet synchronous motor (PMSM), the motor including a stator, including windings and a rotor including at least two permanent magnets. The method includes the steps of determining the rotor d-axis direction by supplying a stator voltage vector pulses to the motor terminals at at least two different stator angles, measuring the phase current at each angle, and determining rotor d-axis position based on motor inductance value in each stator angles calculated from the measured values and determining the rotor d-axis polarity by supplying a current vector to the motor terminals at the q-axis direction, and determining the magnet polarity by observing the direction of the rotor rotation during the test pulses.
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