Adjustable phase advance for PM motor control
AssigneeGoodrich Control Systems Limited
InventorAndrei Dinu
Life of this patent
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Abstract
There is provided herein a method of advancing phase of a DQ reference frame in a Field Oriented Control, FOC, algorithm for a permanent magnet motor. The method comprises: monitoring a component of the stator voltage demand of the permanent magnet motor, when the component of the stator voltage demand surpasses a threshold, calculating a phase advance angle, θadv, based on a gain multiplied by the difference between the component of stator voltage demand and the threshold; and advancing phase of the DQ reference frame in the FOC algorithm based on the calculated phase advance angle, up to a maximum phase advance angle when motor speed is positive, or down to a minimum phase angle when motor speed is negative.
Claims20
A method of advancing phase of a DQ reference frame in a Field Oriented Control (FOC) algorithm for a permanent magnet motor, the method comprising:
- monitoring a component of a stator voltage demand of the permanent magnet motor, wherein the component comprises one or more components of a Park transformation;
- either (i) calculating a phase advance angle based on a gain multiplied by a difference between the component of the stator voltage demand and the threshold of the component if the component of the stator voltage demand exceeds a threshold of the component or (ii) setting the phase advance angle to zero if the component of the stator voltage demand is within the threshold of the component;
- and
- advancing the phase of the DQ reference frame in the FOC algorithm based on the phase advance angle either (i) up to a maximum phase advance angle when motor speed is positive or (ii) down to a minimum phase advance angle when the motor speed is negative;
- wherein the motor speed is positive based on one of a clockwise rotation or an anticlockwise rotation of a motor current vector and a motor voltage vector about a Q-axis and negative based on another of the clockwise rotation or the anticlockwise rotation of the motor current vector and the motor voltage vector about the Q-axis.
A system for providing a phase advance angle for Field Oriented Control (FOC) of a permanent magnet motor, the system comprising:
- a controller configured to:
- monitor a component of a stator voltage demand of the permanent magnet motor, wherein the component comprises one or more components of a Park transformation;
- calculate a difference between the component of the stator voltage demand and a threshold of the component;
- either (i) calculate the phase advance angle based on a proportional gain applied to the calculated difference between the component of the stator voltage demand and the threshold of the component if the component of the stator voltage demand exceeds the threshold of the component or (ii) set the phase advance angle to zero if the component of the stator voltage demand is within the threshold of the component;
- and
- output the phase advance angle for advancing a DQ reference frame in a FOC algorithm based on the phase advance angle either (i) up to a maximum phase advance angle when motor speed is positive or (ii) down to a minimum phase advance angle when the motor speed is negative;
- wherein the motor speed is positive based on one of a clockwise rotation or an anticlockwise rotation of a motor current vector and a motor voltage vector about a Q-axis and negative based on another of the clockwise rotation or the anticlockwise rotation of the motor current vector and the motor voltage vector about the Q-axis.
Dependencies are inferred from the claim text.