| 摘要 |
A rotation speed regulator for an electric motor (10) has a tachogenerator (38) which emits short pulses (18). These pulses are fed to a discharge transistor (19) which discharges a first capacitor (25) whenever such pulses (18) arrive, which first capacitor (25) is subsequently charged again via a charging element (27). The voltage on the first capacitor (25) is fed to a threshold-value element (24) which triggers only when the voltage on the first capacitor (25) exceeds a specific threshold value and which, when such value is exceeded, acts such that a second capacitor (33), which is used as an integrating capacitor, is fed with corresponding charging current pulses (30). The higher the motor rotation speed, the shorter these current charging pulses (30) become, and, in addition, the lower the voltage on the second capacitor (33) to which a relatively high-value resistor is allocated as the discharging element (34). This voltage on the second capacitor (33) is fed to a current regulator as a reference variable, to which current regulator (35), furthermore, an actual current value (36) is fed from a measuring resistor (12) in the feed line of the motor (10), so that a high motor current is supplied at low rotation speeds, which current reduces more and more as the motor rotation speed approaches the desired value. <IMAGE>
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