| 摘要 |
A control apparatus (1) for a DC variable frequency motor, mainly comprising a control module (3) and a controlled module (4). The control module comprises a phase truncation circuit (11) which continuously truncates a conduction angle of an AC power supply (10); the controlled module comprises a rectifier circuit (12), a phase detection circuit (14) and a control unit (15), wherein the rectifier circuit rectifies a truncated AC power supply, and the phase detection circuit is used for detecting a truncated conduction angle. The control unit is used for correspondingly controlling the rotation speed or an action of a motor (2) according to a conduction angle detected by the phase detection circuit. Hereby, the conduction angle of the AC power supply truncated by the phase truncation circuit can be controlled to be less than 60 degrees by taking the size of the conduction angle as a control command, thereby performing full range speed control on the rotation speed without causing the problem of the power factor being low. |
