This text derive and offer asynchronous power factor relation of motor expressed and show at first, and regard power factor of the asynchronous motor as the target of controlling , make the motor run under higher power factor , Reduce the loss which does not have function quantity, thus achieve the energy-conserving goal. Emulation result indicates , when the motor is in unloaded and light year, can make certain energy- conserving result .
Asynchronous motor is used in industrial and agricultural production and consumption of a maximum of electrical equipment. In electric drive system, often with the highest load plus margin to design parameters and selection. In actual operation, the load will change with the actual requirements and changes, it will have electrical power load drag on the situation. Through the load current motor, motor load voltage and power factor analysis, can be found: When the motor for light-load or no load when the motor power factor lower when the motor for the full load of high power factor. Higher energy saving power factor is an important task. Frequency Control is a typical high-speed DC motor way, it applies to asynchronous motor, but also to synchronous motor. AC motors can be used not only VVVF stepless speed regulation, but under different load, through the appropriate voltage and frequency adjustment of the relationship between the motor will always run at high efficiency, and to ensure good dynamic performance.
Key word: One-chip computer; Power factor; Asynchronous motor; Energy-conservation