AC motor driving apparatus and method of controlling the same

Details AC motor driving apparatus and method of controlling the same AC motor driving apparatus and method of controlling the same

2007-09-18

2007-09-18

Ip, Paul (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S254100, C318S434000, C318S434000, C318S629000

Reexamination Certificate

active

11486151

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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