AC motor driving apparatus and method of controlling the same
First Claim
1. An AC motor driving apparatus, which has an AC motor, an inverter for supplying power to the motor, a current sensor for detecting current that flows in the motor or the inverter, a rotation sensor for detecting the rotation of the rotor in the motor, and a control unit for controlling the driving of the inverter, the apparatus comprising:
- a rotational position detector for detecting a rotational position of the rotor from an output signal sent from the rotation sensor;
a motor current estimating unit for estimating values of three-phase currents that flow in the motor from a current detection value detected by the current sensor and the rotational position of the rotor; and
an inverter controller for controlling the inverter by using the estimated three-phase motor current values.
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Accused Products
Abstract
The AC motor driving apparatus comprises an inverter for supplying power to an AC motor, current sensors for detecting current that flows in the motor or inverter, a rotation sensor for detecting the rotation of the rotor in the motor, and a control unit for controlling the driving of the inverter. A current detection value detected by the current sensor and a rotor rotational position are used to estimate three-phase motor current values. The estimated motor current values are used to control the inverter. Thereby, an inexpensive, space-saving AC motor driving apparatus as well as an AC motor controller, electric actuator, or vehicle that can perform highly precise torque control from zero speed to high-speed rotation without depending on the PWM pulse pattern are provided.
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Citations
20 Claims
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1. An AC motor driving apparatus, which has an AC motor, an inverter for supplying power to the motor, a current sensor for detecting current that flows in the motor or the inverter, a rotation sensor for detecting the rotation of the rotor in the motor, and a control unit for controlling the driving of the inverter, the apparatus comprising:
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a rotational position detector for detecting a rotational position of the rotor from an output signal sent from the rotation sensor;
a motor current estimating unit for estimating values of three-phase currents that flow in the motor from a current detection value detected by the current sensor and the rotational position of the rotor; and
an inverter controller for controlling the inverter by using the estimated three-phase motor current values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling an AC motor driving apparatus, which has an AC motor, an inverter for supplying power to the motor, a current sensor for detecting current that flows in the motor or the inverter, a rotation sensor for detecting the rotation of the rotor in the motor, and a control unit for controlling the driving of the inverter, the method comprising the steps of:
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detecting a rotational position of the rotor from an output signal sent from the rotation sensor;
estimating the values of three-phase currents that flow in the motor from a current detection value detected by the current sensor and the rotational position of the rotor; and
controlling the inverter by using the estimated three-phase motor current values. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A vehicle, which has a vehicle driving AC motor, an inverter for supplying power to the motor, a current sensor for detecting current that flows in the motor or the inverter, a rotation sensor for detecting the rotation of the rotor in the motor, and a control unit for controlling the driving of the inverter, the vehicle comprising:
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a rotational position detector for detecting a rotational position of the rotor from an output signal sent from the rotation sensor;
a motor current estimating unit for estimating the values of three-phase currents that flow in the motor from a current detection value detected by the current sensor and the rotational position of the rotor; and
an inverter controller for controlling the inverter by using the estimated three-phase motor current values.
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Specification