Method of rotor angle estimation for a multi-phase permanent magnet rotor motor
AssigneeKinetic Technologies International Holdings LP
InventorsKwei Chung Li, Feng Zhu
Life of this patent
Estimating the term…
Abstract
A method of rotor angle estimation for a multi-phase permanent magnet rotor motor having a plurality of phase coils. The method comprises applying a voltage to one or more of the phase coils and measuring respective phase coil currents. The method includes obtaining measured or estimated values of resistance and inductance for each phase coil from the measured phase coil currents and estimating rotor angle θ based on the measured or estimated values of resistance and inductance for each phase coil.
Claims13
A method of rotor angle estimation for a multi-phase permanent magnet motor having a plurality of phase coils, each phase coil having two free ends and the plurality of phase coils being without a common node, the method comprising the steps of:
- applying a stepped direct current (DC) pulse wave modulated (PWM) voltage waveform with a predetermined duty ratio simultaneously to each of the phase coils;
- measuring respective phase coil currents a predetermined period of time after the stepped DC PWM voltage waveform has been simultaneously applied to each of the phase coils;
- determining respective values of resistance and inductance for each phase coil from the measured respective phase coil currents;
- and
- estimating a rotor angle of the motor based on the determined respective values of resistance and inductance for each of the phase coils.
A method of estimating one or more parameters of a three-phase permanent magnet motor comprising three phase coils, each phase coil having two free ends, the three phase coils being without a common node, the method comprising the steps of:
- applying a stepped direct current (DC) pulse wave modulated (PWM) voltage waveform with a predetermined duty ratio simultaneously to all of the three of the phase coils;
- measuring respective phase coil currents a predetermined period of time after the stepped DC PWM voltage waveform has been simultaneously applied to each of the phase coils;
- and
- determining respective values of resistance and inductance for each phase coil from the measured respective phase coil currents.
A method of rotor angle estimation for a multi-phase permanent magnet motor having a plurality of phase coils, each phase coil having two free ends and the plurality of phase coils being without a common node, the method comprising the steps of:
- applying a stepped direct current (DC) pulse wave modulated (PWM) voltage waveform with a predetermined duty ratio simultaneously to each of the phase coils;
- measuring respective phase coil currents a predetermined period of time after the stepped DC PWM voltage waveform has been applied simultaneously to each of the phase coils;
- determining respective values of resistance and inductance for each phase coil from the measured respective phase coil currents;
- and
- estimating rotor flux magnitude based on the determined respective values of resistance and inductance for each of the phase coils.
A method of testing a multi-phase permanent magnet motor having a plurality of phase coils, each phase coil having two free ends and the plurality of phase coils being without a common node, the method comprising the steps of:
- applying a stepped direct current (DC) pulse wave modulated (PWM) voltage waveform with a predetermined duty ratio simultaneously to each of the phase coils;
- measuring respective phase coil currents a predetermined period of time after the stepped DC PWM voltage waveform has been simultaneously applied to each of the phase coils;
- determining respective values of resistance and inductance for each phase coil from the measured respective phase coil currents;
- and
- storing said determined respective values of resistance and inductance for each of the phase coils.
Dependencies are inferred from the claim text.