Magnetization state control method and magnetization state control device
AssigneesNissan Motor Co., Ltd., Wisconsin Alumni Research Foundation
InventorsKensuke Sasaki, Takashi Fukushige, Takashi Katou, Brent S. Gagas, Robert D. Lorenz
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Abstract
A magnetization state control method for a variable magnetization machine, the method includes generating a flux linkage vector while changing a magnetization state of the variable magnetization machine such that a trajectory of the flux linkage vector has a curved clockwise trajectory on a dq-axis plane and a magnitude of the flux linkage vector temporally changes, with the dq-axis plane being a synchronous reference frame with a d-axis pointing in a direction of a permanent magnet flux and a q-axis being 90 degrees ahead of the d-axis in a rotational direction of a rotor.
Claims13
A magnetization state control method for a variable magnetization machine using a magnetization state control device including an inverter configured to supply electric power to the variable magnetization machine, and an electronic controller configured to operate the inverter, the method comprising:
- changing, by the controller, an operating state of the inverter to control a magnetization state of a permanent magnet of the variable magnetization machine and a torque of the variable magnetization machine;
- and
- generating, by the controller, a flux linkage vector to change the magnetization state of the permanent magnet of the variable magnetization machine such that a trajectory of the flux linkage vector has a curved clockwise trajectory on a dq-axis plane about an origin of the dq-axis plane and a magnitude of the flux linkage vector temporally changes, with the dq-axis plane being a synchronous reference frame with a d-axis pointing in a direction of a permanent magnet flux and a q-axis being 90 degrees ahead of the d-axis in a rotational direction of a rotor.
A magnetization state control device for a variable magnetization machine, the magnetization state control device comprising:
- an inverter configured to supply electric power to the variable magnetization machine;
- and
- an electronic controller having at least one microcomputer and configured to operate the inverter,
- the controller being configured to change an operating state of the inverter to control a magnetization state of a permanent magnet of the variable magnetization machine and a torque of the variable magnetization machine, and
- the controller being further calculate a target trajectory of a flux linkage vector to generate a flux linkage vector to change the magnetization state of the permanent magnet of the variable magnetization machine such that a trajectory of the flux linkage vector has a curved clockwise trajectory on a dq-axis plane about an origin of the dq-axis plane and a magnitude of the flux linkage vector temporally changes, with the dq-axis plane being a synchronous reference frame with a d-axis pointing in a direction of a permanent magnet flux and a q-axis being 90 degrees ahead of the d-axis in a rotational direction of a rotor.
Dependencies are inferred from the claim text.