Abstract:
The present invention relates to an inverter control device and a control method thereof and specifically, to an inverter control device and a control method thereof which stably operates a three-phase motor using a small capacitor on a direct current terminal. The inverter control device by one embodiment of the present invention controls an inverter in which a direct current terminal voltage pulsates with a double frequency of a system frequency. The inverter control device comprises a current sensing unit for sensing an output current value of the inverter; a voltage sensing unit for sensing a direct current terminal voltage value of the inverter; and a control unit for producing an average value of a rotator standard q-axis current boundary value which is periodically changed based on the output current value and the direct current terminal voltage value, and producing a current command value based on the average value of the rotator standard q-axis current boundary value, and driving a three-phase motor based on the current command value. According to the present invention, the inverter control device stably variable speed-controls a motor using a small capacitor on a direct current terminal of the inverter and improves the reliability of an inverter circuit. Also, the inverter control device eliminates a circuit to initially charge a capacitor using the small capacitor. [Reference numerals] (7) Voltage sensing unit; (8) Gate driver; (9) Control unit
Abstract:
PURPOSE: A single external feeding induction machine and a controlling method thereof are provided to easily control a power conversion device. CONSTITUTION: A stator(100) includes a single or three phase systematic power and a coil. A rotor(200) is formed in the stator. A power conversion device(300) is adhered to the rotor. The power conversion device controls the current of the rotor without external power. A control circuit(400) controls the power conversion device. [Reference numerals] (1) AC power supply; (10) Induction motor; (100) Stator; (200) Rotor; (300) Power conversion device; (410) High level controller; (420) Rotor DC-link voltage controller; (430) Current command generator; (440) Current controller