Method and system for estimating a rotor position with a notch filter
AssigneeDeere & Company
InventorsDan Li, Jacob Pence, Long Wu
Life of this patent
Estimating the term…
Abstract
A motor has a rotor that rotates in response to one or more alternating current input signals. A position sensor is adapted to generate a substantially saw-tooth waveform indicative of a position of the rotor. A primary processing module or data processor is capable of providing position data and speed data for the rotor based on the substantially saw-tooth waveform. A notch filter can reject one or more selected frequency components in the substantially saw-tooth waveform to reduce distortion off the substantially saw-tooth waveform that would otherwise tend to cause inaccuracy in the provided position data and speed data.
Claims21
A system for estimating a rotor position of a motor, the system comprising:
- a motor with a rotor that rotates in response to one or more alternating current input signals;
- a position sensor that generates a substantially saw-tooth waveform indicative of a position of the rotor;
- a primary processing module for providing position data and speed data for the rotor based on the substantially saw-tooth waveform;
- and
- a notch filter for rejecting one or more selected frequency components in the substantially saw-tooth waveform to reduce distortion off the substantially saw-tooth waveform that would otherwise tend to cause inaccuracy in the provided position data and speed data.
A method for estimating a rotor position of the motor, the method comprising:
- rotating a rotor of a motor in response to one or more alternating current input signals;
- generating a substantially saw-tooth waveform indicative of a position of the rotor;
- providing position data and speed data for the rotor based on the substantially saw-tooth waveform;
- and
- rejecting, by a notch filter, one or more selected frequency components in the substantially saw-tooth waveform to reduce distortion off the substantially saw-tooth waveform that would otherwise tend to cause inaccuracy in the provided position data and speed data.
Dependencies are inferred from the claim text.