Position sensorless control algorithm for AC machine
First Claim
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1. A control system for an electric motor comprising:
- an inverter for providing power to the electric motor;
a controller for controlling said inverter;
a first motor speed control block in said controller injecting a high frequency signal into said electric motor to determine the speed and position of the electric motor;
a second motor speed control block in said controller detecting the back electromotive force to determine the speed and position of the electric motor; and
a transition control block in said controller to vary operation between said first motor speed control block and said second motor speed control block.
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Abstract
A control system for an electric motor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a first motor speed control block in the controller injecting a high frequency signal into the electric motor to determine the speed and position of the electric motor, a second motor speed control block in the controller detecting the back electromotive force to determine the speed and position of the electric motor, and a transition control block in said controller to vary operation between the first motor speed control block and the second motor speed control block.
58 Citations
19 Claims
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1. A control system for an electric motor comprising:
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an inverter for providing power to the electric motor;
a controller for controlling said inverter;
a first motor speed control block in said controller injecting a high frequency signal into said electric motor to determine the speed and position of the electric motor;
a second motor speed control block in said controller detecting the back electromotive force to determine the speed and position of the electric motor; and
a transition control block in said controller to vary operation between said first motor speed control block and said second motor speed control block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling an electric motor comprising:
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injecting a high frequency signal into said motor at a first speed;
processing feedback generated by the injected high frequency signal to determine the position of a rotor in the electric motor at the first speed;
determining the speed of the electric motor; and
determining the position of the rotor in the electric motor based on back electromotive force at a second speed. - View Dependent Claims (10, 11)
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12. A powertrain for a vehicle comprising:
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an electric motor functionally coupled to at least one wheel in the vehicle;
an inverter electrically coupled to said electric motor;
a DC voltage source electrically coupled to said inverter;
a controller for controlling the output of said inverter to provide electrical current to said electric motor;
a first motor control module in said controller injecting a high frequency signal into said electric motor to determine the speed and position of the electric motor;
a second motor control module in said controller detecting the back electro-motive force to determine the speed and position of the electric motor; and
a transition control module in said controller to vary operation between said first motor control module and said second motor control module based upon motor speed. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification