| 摘要 |
Method for processing a measured value which is presented as a frequency and varies between mid values by forming a first electrical signal which is variable with the ratio of said frequency to a reference frequency, the signal in turn being in the same ratio to a specifiable electrical reference value. An essential feature of the invention is the use of the method in a speed regulation system for an asynchronous motor, in particular for an exhaust gas fan. The circuit for carrying out the method contains two operational amplifiers 51 and 55 connected to its various inputs, the two input pairs each being connected to a capacitor (47, 38) one of which is connected to chassis and the other to a voltage source which exhibits two extreme values for each cycle of the frequency of the actual-value sensor and is clocked between the two extreme values at the frequency of the actual-value sensor, the voltage range between the extreme values being settable but constant. |
