| 摘要 |
A washing machine motor drive device for driving a motor using an inverter circuit, which implements a constant torque control through a change in the torque-revolution speed characteristic of a motor. It facilitates an easy control of braking torque (negative torque), thereby providing a maximized braking torque. An easy control of regenerative energy is also provided, and the back electromotive force is consumed by the internal resistance of motor. Practically described; DC power of rectifier circuit connected to an alternating current source is converted by an inverter circuit into AC power for driving a motor for operating an agitator or a washing/spinning tub, motor rotor position is detected by rotor position detector, motor current is detected by current detector, control device controls the inverter circuit for resolving motor current into a current component corresponding to magnetic flux and a current component corresponding to torque. At the motor braking operation, the current component corresponding to magnetic flux and the current component corresponding to torque are controlled independently. As the result, the torque at high speed revolution can be increased, or the efficiency at low speed revolution can be improved. This leads to a downsized and energy-conscious motor, and contributes to the prevention of an abnormal rise of DC voltage in the inverter circuit.
|
