| 摘要 |
The invention relates to a procedure and an apparatus for adjusting the speed of an induction machine fed by a frequency converter or an inverter to a value corresponding to a speed reference value fR. In the procedure, a frequency signal nm dependent on the speed of the motor is generated and the speed reference fR is corrected by means of a correction signal C proportional to the slip of the motor. The corrected speed reference value is used as a frequency reference fs for the frequency converter or inverter. According to the invention, the correction signal C proportional to the slip is generated with the aid of the frequency signal nm and another frequency signal ns' formed from the frequency reference fs of the frequency converter or inverter. When the motor speed changes, for example, due to a variation in the load, the frequency reference of the frequency converter or inverter is corrected accordingly.
|
