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US 10,473,446 B2Granted
System and method for determining rotor position offset of an electric machine
AssigneeFord Global Technologies, LLC
InventorsMichael W. Degner, Shailesh Shrikant Kozarekar, Daniel Richard Luedtke
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Abstract
A method according to an exemplary aspect of the present disclosure includes, among other things, detecting a position, including a polarity, of a rotor to detect incorrect rotor position offset of an electric machine without generating torque or motion within the electric machine.
Claims16
A method, comprising:
- detecting a position and a polarity of a rotor of an electric machine without generating torque or motion within the electric machine, wherein the step of detecting includes:
- sensing an angular position of the rotor with a sensor;
- determining an alignment and a polarity of a direct axis of the rotor;
- and
- comparing the position and the polarity of the direct axis to the angular position sensed by the sensor to determine an incorrect rotor position offset.
2 more elements
A method, comprising:
- detecting an incorrect rotor position offset of a rotor of an electric machine without generating torque or motion within the electric machine, wherein detecting the incorrect rotor position offset includes employing a voltage command tracking method,
- wherein employing the voltage command tracking method includes actively regulating a current of the electric machine to zero by applying a voltage command angle;
- filtering the voltage command angle;
- and
- adjusting the filtered voltage command angle by a calibratable value to obtain the rotor position of the rotor;
- and
- comparing the rotor position of the rotor obtained by the voltage command tracking method with information received from a sensor that monitors the position of the rotor.
4 more elements
Dependencies are inferred from the claim text.