| CPC H02P 27/085 (2013.01) [H02P 21/09 (2016.02); H02P 21/22 (2016.02)] | 18 Claims |
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1. A method of driving a multi-phase permanent magnet rotor motor having a plurality of phase coils, the method comprising the steps of:
outputting pulse modulated control signals to the respective phase coils to bring the motor to a constant mode of operation;
measuring phase coil currents; and
based on a selected phase coil, adjusting values of multi-phase stationary reference frame voltages comprising said pulse modulated control signals for remaining phase coils not including said selected phase coil until the phase coil currents of the remaining phase coils equals the phase coil current of the selected phase coil or until the phase coil currents of the remaining phase coils fall with a predetermined range with respect to the phase coil current of the selected phase coil,
wherein the steps of measuring the phase coil currents and adjusting the values of the multi-phase stationary reference frame voltages are implemented whilst the motor is in the constant mode of operation.
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15. A multi-phase permanent magnet rotor motor comprising:
a plurality three phase coil windings; and
a controller, said controller configured to:
output pulse modulated control signals to the respective phase coils to bring the motor to a constant mode of operation;
measure phase coil currents; and
based on a selected phase coil, adjust values of multi-phase stationary reference frame voltages comprising said pulse modulated control signals for remaining phase coils not including said selected phase coil until the phase coil currents of the remaining phase coils equals the phase coil current of the selected phase coil or until the phase coil currents of the remaining phase coils fall with a predetermined range with respect to the phase coil current of the selected phase coil,
wherein the controller is configured to measure the phase coil currents and adjust the values of the multi-phase stationary reference frame voltages whilst the motor is in the constant mode of operation.
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16. A controller for a multi-phase permanent magnet rotor motor having a plurality three phase coil windings, the controller configured to:
output pulse modulated control signals to the respective phase coils to bring the motor to a constant mode of operation;
measure phase coil currents; and
based on a selected phase coil, adjust values of multi-phase stationary reference frame voltages comprising said pulse modulated control signals for remaining phase coils not including said selected phase coil until the phase coil currents of the remaining phase coils equals the phase coil current of the selected phase coil or until the phase coil currents of the remaining phase coils fall with a predetermined range with respect to the phase coil current of the selected phase coil;
wherein the controller is configured to measure the phase coil currents and adjust the values of the multi-phase stationary reference frame voltages whilst the motor is in the constant mode of operation.
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17. A multi-phase permanent magnet rotor motor comprising:
a plurality three phase coil windings; and
a controller, said controller configured to:
output pulse modulated control signals to the respective phase coils to bring the motor to a constant mode of operation;
measure phase coil currents; and
based on a selected phase coil, adjust values of multi-phase stationary reference frame voltages comprising said pulse modulated control signals for remaining phase coils not including said selected phase coil until the phase coil currents of the remaining phase coils equals the phase coil current of the selected phase coil or until the phase coil currents of the remaining phase coils fall with a predetermined range with respect to the phase coil current of the selected phase coil;
wherein, if the measured phase coil current of the selected phase coil is greater than the phase coil currents of the remaining phase coils, the controller is configured to increase the values of the multi-phase stationary reference frame voltages for the remaining phase coils by one or more predetermined increments; or
if the measured phase coil current of the selected phase coil is less than the phase coil currents of the remaining phase coils, the controller is configured to decrease the values of the multi-phase stationary reference frame voltages for the remaining phase coils by one or more predetermined increments.
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18. A multi-phase permanent magnet rotor motor comprising:
a plurality three phase coil windings; and
a controller, said controller configured to:
output pulse modulated control signals to the respective phase coils to bring the motor to a constant mode of operation;
measure phase coil currents; and
based on a selected phase coil, adjust values of multi-phase stationary reference frame voltages comprising said pulse modulated control signals for remaining phase coils not including said selected phase coil until the phase coil currents of the remaining phase coils equals the phase coil current of the selected phase coil or until the phase coil currents of the remaining phase coils fall with a predetermined range with respect to the phase coil current of the selected phase coil,
wherein the controller is configured to measure the phase coil currents and adjust the values of the multi-phase stationary reference frame voltages for the remaining phase coils for each phase coil in turn, each such phase coil being nominated the selected phase coil.
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