| 摘要 |
The invention provides a motor control device and a phase current detection method by using the motor control device for the power part of a compressor and a fan, which can efficiently drive motors even at a low speed. The motor control device comprises a control circuit for generating PWM signals via vector control, a converter circuit with six built-in switch elements and their respective freewheeling diodes, a direct-current power supply for providing current to a brushless motor and a current detector for detecting the supply current to the motor by being connected with the main line of the DC power supply and the converter circuit. According to the current phase angle calculated by the vector control, the non-current period of the main line is calculated. When there is no current on the main line, the converter circuit is controlled and the current flows from the motor to the DC power supply. By the current detector, the regenerative current on the main line is measured. According to the measured regenerative current, the current of each phase is calculated. |
