| 摘要 |
The invention relates to a method for operating an asynchronous motor by means of a voltage control device, a three-phase voltage plate, a current measuring device, a voltage measuring device and a control device for adjusting the voltage in such a way that the losses are minimised, whereby said minimisation depends on the load. To this end, the current in a supply line and the voltage between two phases are measured. The result supplied by the voltage measuring device is falsified by the voltage that occurs on the clamps and is induced by the still unchanged main field of the motor when the current is interrupted. Said voltage is thus considered when the voltage that is decisive for the control device is generated. Consideration is carried out by the controller that subtracts the voltage which is induced by the main field of the asynchronous motor, from the measured result of the voltage measuring device. The values which are actually generated by the voltage control device are thus obtained and are supplied to the control device which matches said values to voltage values which are stored in the related pairs of values of current and voltage for an operation involving minimised losses, for the respectively measured current values. |
