Control device for alternating current motor
AssigneeKabushiki Kaisha Yaskawa Denki
InventorsAkira Yamazaki, Kozo Ide
Life of this patent
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Abstract
A control device for an alternating current motor according to embodiments includes a current distributor and a phase estimator. The current distributor divides a torque command by using a control phase and outputs a component that contributes to a mechanical output of the motor as a δ-axis current command and a component that does not contribute to the mechanical output as a γ-axis current command. The phase estimator computes a phase at which a γ-axis component of an addition amount of the output of the current controller and a voltage drop amount of inductance of the motor becomes zero and outputs the computed phase as the control phase.
Claims17
A control device for an alternating current motor comprising:
- a current distributor that divides a torque command for the alternating current motor by using a control phase and outputs a component that contributes to a mechanical output of the alternating current motor as a δ-axis current command and a component that does not contribute to the mechanical output as a γ-axis current command;
- a current controller that performs a control in such a manner that the δ-axis current command and the γ-axis current command are respectively identical with a δ-axis current and a γ-axis current flowing into the alternating current motor;
- a voltage drop calculator that calculates a voltage drop amount of inductance and wirewound resistance of the alternating current motor;
- a voltage commander that outputs a voltage command for the alternating current motor on the basis of an output of the current controller and an output of the voltage drop calculator;
- a phase estimator that computes at least one of a phase at which a γ-axis component of an addition amount of the output of the current controller and a voltage drop amount of the inductance becomes zero and a phase at which a δ-axis component obtained by integrating the addition amount becomes zero and outputs the computed phase as the control phase;
- and
- an inverter circuit that applies a voltage based on the voltage command to the alternating current motor.
A control device for an alternating current motor comprising:
- a current distribution means that divides a torque command for the alternating current motor by using a control phase and outputs a component that contributes to a mechanical output of the alternating current motor as a δ-axis current command and a component that does not contribute to the mechanical output as a γ-axis current command;
- a current control means that performs a control in such a manner that the δ-axis current command and the γ-axis current command are respectively identical with a δ-axis current and a γ-axis current flowing into the alternating current motor;
- a voltage drop calculation means that calculates a voltage drop amount of inductance and wirewound resistance of the alternating current motor;
- a voltage command means that outputs a voltage command for the alternating current motor on the basis of an output of the current control means and an output of the voltage drop calculation means;
- a phase estimation means that computes at least one of a phase at which a γ-axis component of an addition amount of the output of the current control means and a voltage drop amount of the inductance becomes zero and a phase at which a δ-axis component obtained by integrating the addition amount becomes zero and outputs the computed phase as the control phase;
- and
- a voltage output means that applies a voltage based on the voltage command to the alternating current motor.
Dependencies are inferred from the claim text.