| 摘要 |
Disclosed is an arrangement for controllable adjustment of rotational speed as well as braking of unbalance drives with three-phase motors by cycled switching, on and off, of a current supply by means of electronic switching gear. A central signal splitter and interlock stage is provided, which is supplied with synchronising pulses from a main power supply and which acts on the electronic switching gear through oscillator stages. The switching stage is connected on its input side with a start-stop switching and interlock unit, a runup-time stage, a controllable multivibrator and a braking phase angle control stage that is controlled by means of a time stage. Two phases of the current supply are by-passed by electronic switches during braking. |
