Motor controller for operating an inverter in current-controlled and voltage-controlled modes
First Claim
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1. A system comprising:
- a brushless electric motor having a rotor and a stator;
inverter means for commutating power to said motor which is synchronous with the motor;
position feedback means for providing at least one feedback signal indicating the position of said rotor relative to said stator;
first motor controller means, responsive to said at least one feedback signal, for generating first commutation commands corresponding to a current-controlled mode of operation;
second motor controller means, responsive to said at least one feedback signal, for generating second commutation commands corresponding to a voltage-controlled mode of operation; and
selecting means, responsive to said first and second motor controller means, for supplying said first commutation commands when motor speed is below a threshold and supplying said second commutation commands when said motor speed is above said threshold to said inverter means.
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Abstract
A motor controller for brushless motors operates an inverter in a current-controlled mode for low motor speeds and in a voltage-controlled mode for high motor speeds. By switching from the current-controlled mode to the voltage-controlled mode at higher speeds, the motor can be designed at maximum efficiency, and minimum weight, cost and volume.
17 Citations
8 Claims
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1. A system comprising:
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a brushless electric motor having a rotor and a stator; inverter means for commutating power to said motor which is synchronous with the motor;
position feedback means for providing at least one feedback signal indicating the position of said rotor relative to said stator;first motor controller means, responsive to said at least one feedback signal, for generating first commutation commands corresponding to a current-controlled mode of operation; second motor controller means, responsive to said at least one feedback signal, for generating second commutation commands corresponding to a voltage-controlled mode of operation; and selecting means, responsive to said first and second motor controller means, for supplying said first commutation commands when motor speed is below a threshold and supplying said second commutation commands when said motor speed is above said threshold to said inverter means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification