Amplitude detection method and apparatus for high frequency impedance tracking sensorless algorithm
AssigneeGeneral Motors Corporation
InventorsSteven E. Schulz, Nitinkumar R. Patel
Life of this patent
Estimating the term…
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, where the first motor speed control block includes a tuned moving average filter to determine the magnitude of high frequency current in the electric motor.
Claims18
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;
- and
- wherein said first motor speed control block includes a tuned moving average filter to determine the magnitude of high frequency current in the electric motor.
A method of controlling an electric motor comprising:
- injecting a high frequency signal into said electric motor;
- and
- processing feedback generated by the injected high frequency using a tuned moving average filter to determine the position of a rotor in the electric motor.
A powertrain for a vehicle comprising:
- 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;
- and
- wherein said first motor control module includes a tuned moving average filter to determine the magnitude of high frequency current in the electric motor.
Dependencies are inferred from the claim text.