Overmodulation systems and methods for induction motor control
AssigneeBallard Power Systems Inc.
InventorsLi Chen, Richard J. Hampo, Venkatapathi R. Nallapa
Life of this patent
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Abstract
Systems and methods for controlling an induction motor including detecting a field weakening operation state of the motor, wherein the field weakening operation state is detected when a flux current, Id, in the motor is reduced to a predetermined fraction of its normal, non-voltage limited value. The systems and methods also including disabling an overmodulation operation state of the motor before said field weakening operation state is detected and enabling the overmodulation operation state of the motor after said field weakening operation state is detected.
Claims15
A method for controlling an induction motor, the method comprising:
- detecting a field weakening operation state of the motor;
- disabling an overmodulation operation state of the motor before the field weakening operation state is detected;
- and
- enabling the overmodulation operation state of the motor after the field weakening operation state is detected.
A system for controlling an induction motor, the system comprising:
- means for detecting a field weakening operation state of the motor;
- means for disabling an overmodulation operation state of the motor until the field weakening operation state is detected;
- and
- means for enabling the overmodulation operation state of the motor after the field weakening operation state is detected.
A computer-readable medium storing instructions for causing a controller to control an induction motor, by:
- detecting a field weakening operation state of the motor, wherein the field weakening operation state is detected when a flux current, Id, in the motor is reduced to a predetermined sub-multiple of its normal, non-voltage limited value;
- disabling an overmodulation operation state of the motor before the field weakening operation state is detected;
- and
- enabling the overmodulation operation state of the motor after the field weakening operation state is detected.
A system for controlling an induction motor, the system comprising:
- at least one sensor to detect at least one operating condition of the motor;
- a controller coupled to the at least one sensor to receive at least one signal corresponding to the at least one operating condition of the motor detected by the at least one sensor, and programmed to:
- detect a field weakening operation state of the motor, wherein the field weakening operation state is detected when a flux current, Id, in the motor is reduced to a predetermined fraction of its normal, non-voltage limited value;
- disable an overmodulation operation state of the motor before the field weakening operation state is detected;
- and
- enable the overmodulation operation state of the motor after the field weakening operation state is detected.
Dependencies are inferred from the claim text.