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US 2014/0197771 A1Published application
Motor control apparatus and motor control method
AssigneeKabushiki Kaisha Yaskawa Denki
InventorsZhenning CHEN, Tomohiro KAWACHI, Kenji TOMOHARA, Koji HIGASHIKAWA, Masashi TAKENOUCHI
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Abstract
A winding switching signal generator is configured to obtain information indicating a degree of field weakening from at least one of a current command calculator and a constant output controller, and to generate a winding switching signal for switching from a low speed rotation state to a high speed rotation state when the degree of the field weakening exceeds a predetermined condition in the low speed rotation state.
Claims15
A motor control apparatus comprising:
- a d-axis current command value corrector configured to decrease a d-axis current command value as a command value of an exciting current component of a current flowing in an AC motor to perform field weakening;
- a field weakening information obtaining section configured to obtain information indicating a degree of the field weakening;
- and
- a switch command generator configured to generate a switch command from a first state to a second state when the degree of the field weakening exceeds a predetermined condition in the first state, wherein in the first state power is supplied to a coil of a first winding number arranged in the AC motor, and wherein in the second state power is supplied to a coil of a second winding number that is smaller than the first winding number.
1 more element
A motor control method comprising:
- decreasing a d-axis current command value as a command value of an exciting current component of a current flowing in an AC motor to perform field weakening;
- obtaining information indicating a degree of the field weakening;
- and
- generating a switch command from a first state to a second state when the degree of the field weakening exceeds a predetermined condition in the first state, wherein in the first state power is supplied to a coil of a first winding number arranged in the AC motor, and wherein in the second state power is supplied to a coil of a second winding number that is smaller than the first winding number.
1 more element
A motor control apparatus comprising:
- a d-axis current command value correcting means for decreasing a d-axis current command value as a command value of an exciting current component of a current flowing in an AC motor to perform field weakening;
- a field weakening information obtaining means for obtaining information indicating a degree of the field weakening;
- and
- a switch command generating means for generating a switch command from a first state to a second state when the degree of the field weakening exceeds a predetermined condition in the first state, wherein in the first state power is supplied to a coil of a first winding number arranged in the AC motor, and wherein in the second state power is supplied to a coil of a second winding number that is smaller than the first winding number.
1 more element
Dependencies are inferred from the claim text.