Orientation of a rotor
AssigneeMicrochip Technology Incorporated
InventorsJason M. Sachs, Srikar Deshmukh
Life of this patent
Estimating the term…
Abstract
One or more examples relate, generally, to an orientation of a rotor. Some examples relate to an apparatus. The apparatus may include sample-accumulation logic to generate, over a time duration, a value indicative of inductance at least partially responsive to a probe signal provided to a stator of a motor. The apparatus may also include a probe-current discriminator to generate a further value indicative of an orientation of a rotor of the motor at least partially responsive to the generated value. The apparatus may also include update logic to update a process variable of a control loop at least partially responsive to a state of the further value.
Claims21
An apparatus comprising:
- sample-accumulation logic to generate, over a time duration, a value indicative of inductance at least partially responsive to a probe signal provided to a stator of a motor;
- a probe-current discriminator to generate a further value indicative of an orientation of a rotor of the motor at least partially responsive to the generated value;
- and
- update logic to update, at a commutation angle estimator or a phase-locked loop, an estimated electrical angle of a rotor at least partially responsive to a state of the further value indicating the orientation of the rotor to be off by 180°.
A method comprising:
- providing an excitation signal to a stator of a motor to induce a response signal;
- providing a probe signal to the stator;
- generating a signal indicative of inductance at least partially responsive to the induced response signal;
- observing, over a time duration, the generated signal at least partially responsive to the provided probe signal;
- generating a further signal indicative of an orientation of a rotor of the motor at least partially responsive to the observed signal;
- and
- updating, at a commutation angle estimator or a phase-locked loop, an estimated electrical angle of a rotor at least partially responsive to a state of the further signal indicating the orientation of the rotor to be off by 180°.
An apparatus comprising:
- one or more circuits to:
- provide, responsive to a controller, an oscillating signal to a stator of a motor to induce a response signal;
- generate a signal indicative of inductance at least partially responsive to the induced response signal;
- observe, over a time duration, the generated signal at least partially responsive to providing a probe signal to the stator;
- generate a further signal indicative of an orientation of a rotor of the motor at least partially responsive to the observed signal;
- and
- update, at a commutation angle estimator or a phase-locked loop, an estimated electrical angle of a rotor at least partially responsive to the further signal indicating the orientation of the rotor to be off by 180°,
- wherein the update to the estimated electrical angle adjusts the estimated electrical angle of the rotor by 180°.
Dependencies are inferred from the claim text.