Motor Control Device, Motor Control Method, and Motor Control System
AssigneeAstemo, Ltd.
InventorKazuya WATANABE
Life of this patent
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Abstract
In a configuration in which an output signal of a current detector of a one-shunt scheme is sampled in a current detection section corresponding to a combination of ON and OFF of a PWM signal to detect phase currents of a motor and the motor is controlled via an inverter based on the detected phase currents, a motor control device, a motor control method, and a motor control system according to the present invention change the length of current detection section based on a voltage of a DC power supply of the inverter. Accordingly, it is possible to easily reduce a change in motor torque due to a change in an inverter voltage.
Claims11
-11. (canceled)
A motor control device for controlling a motor, the motor control device comprising:
- a control unit, wherein the control unit:
- acquires an output signal of a current detector that detects an electric current flowing between an inverter driven by a PWM signal and a DC power supply of the inverter;
- samples the output signal of the current detector in a current detection section corresponding to a combination of ON and OFF of the PWM signal and detects phase currents of the motor;
- controls the motor via the inverter based on the detected phase currents;
- acquires a signal concerning a voltage of the DC power supply;
- changes length of the current detection section based on the voltage of the DC power supply, and
- sets the length of the current detection section to be longer as the voltage of the DC power supply is lower.
A motor control device for controlling a motor, the motor control device comprising:
- a control unit, wherein the control unit:
- acquires an output signal of a current detector that detects an electric current flowing between an inverter driven by a PWM signal and a DC power supply of the inverter;
- samples the output signal of the current detector at predetermined timing and detects phase currents of the motor;
- controls the motor via the inverter based on the detected phase currents;
- acquires a signal concerning a voltage of the DC power supply;
- and
- increases an amount of shifting phases of the PWM signal from one to another as the voltage of the DC power supply decreases.
A motor control method executed by a control unit, the motor control method comprising:
- acquiring an output signal of a current detector that detects an electric current flowing between an inverter driven by a PWM signal and a DC power supply of the inverter;
- sampling the output signal of the current detector in a current detection section corresponding to a combination of ON and OFF of the PWM signal and detecting phase currents of a motor;
- controlling the motor via the inverter based on the detected phase currents;
- acquiring a signal concerning a voltage of the DC power supply;
- changing length of the current detection section based on the voltage of the DC power supply, and
- sets the length of the current detection section to be longer as the voltage of the DC power supply is lower.
A motor control system comprising:
- a motor;
- an inverter driven by a PWM signal;
- a current detector that detects an electric current flowing between the inverter and a DC power supply of the inverter;
- and
- a control unit that:
- acquires an output signal of the current detector;
- samples the output signal of the current detector in a current detection section corresponding to a combination of ON and OFF of the PWM signal and detects phase currents of the motor;
- controls the motor via the inverter based on the detected phase currents;
- acquires a signal concerning a voltage of the DC power supply;
- changes length of the current detection section based on the voltage of the DC power supply, and
- sets the length of the current detection section to be longer as the voltage of the DC power supply is lower.
Dependencies are inferred from the claim text.