PMSM ROTOR ANGLE IDENTIFICATION

摘要

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.

主权项

1. A method for identifying the angle and polarity of the rotor of a permanent magnet synchronous motor (PMSM), controlled by a frequency converter, the motor comprising a stator, including windings and a rotor comprising at least two permanent magnets, wherein the method comprises:
determining the rotor d-axis direction by supplying stator voltage vector pulses to the motor terminals at at least two different angles, measuring the phase current at each angle, and determining the rotor d-axis direction based on motor inductance values in each stator angle, which inductance values have been calculated from the measured values, and determining the rotor d-axis polarity by supplying a torque producing 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.