Systems and methods for electric motor control
AssigneeBallard Power Systems Inc.
InventorsLi Chen, Xingyi Xu, Vinod Reddy, Richard J. Hampo, Kerry E. Grand
Life of this patent
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Abstract
Systems and methods for controlling and/or calculating the torque for a field oriented induction motor operating at a given stator frequency. The systems and methods include calculating the torque using a first algorithm when the motor is at or below a first predetermined stator frequency, a second algorithm when the motor is at or above a second predetermined stator frequency, and a third algorithm when the motor is between the first predetermined stator frequency and the second predetermined stator frequency.
Claims25
A system comprising:
- an electric motor controller having
- an analyzer operable for calculating a torque produced by a field oriented induction motor, the motor operating at a stator frequency;
- and
- wherein the analyzer calculates the torque using an algorithm which is dependent upon the stator frequency, the analyzer calculating the torque using a first algorithm when the motor is at or below a first predetermined stator frequency, a second algorithm when the motor is at or above a second predetermined stator frequency, and a third algorithm when the motor is between the first predetermined stator frequency and the second predetermined stator frequency.
A method for calculating a torque for a field oriented induction motor operating at a stator frequency, the method comprising:
- receiving the stator frequency of the motor;
- and
- calculating the torque using a first algorithm when the motor is at or below a first predetermined stator frequency, a second algorithm when the motor is at or above a second predetermined stator frequency, and a third algorithm when the motor is between the first predetermined stator frequency and the second predetermined stator frequency.
A system for use with an electric powertrain between a field oriented induction motor and a mechanical load, the system comprising:
- a torque-control circuit coupleable to respond to a desired-torque input, the torque-control circuit coupleable to infer a stator frequency of the field oriented induction motor and the torque-control circuit further coupleable to supply a current to the field oriented induction motor, the torque-control circuit configurable to supply the current dependent upon the desired-torque input, the stator frequency, and a combination of an upper-range stator frequency torque equation and a lower-range stator frequency torque equation.
A motorized vehicle comprising:
- a powertrain having an input mechanically coupled to a field oriented induction motor and an output mechanically coupled to a load, the powertrain having
- a torque-control circuit responsive to a desired-torque input, the torque-control circuit coupled to infer a stator frequency of the field oriented induction motor and the torque-control circuit further coupled to supply a current to the field oriented induction motor, the torque-control circuit configured to supply the current on the basis of a relationship keyed to at least two predetermined stator frequencies.
Dependencies are inferred from the claim text.