| 摘要 |
PURPOSE:To enable a excellent operation in control precision and efficiency, to be performed by detecting a power-factor at high precision, with a simple composition, in the driving gear of a brushless motor employing an inverter circuit. CONSTITUTION:By comparing the binary signal of application voltage to an inverter circuit 4 with a control circuit 7, and the binary signal of detected motor current, with each other, a power-factor is detected, and based on output voltage for the detected signal through an integrating circuit, by the control circuit 7, the application voltage to the inverter circuit 4 and frequency are controlled so that the power factor may approximate 1. As a result, a device is not influenced by carrier component in the inverter circuit 4, and control precision is improved with the carrier component in a high rotation area. |
