Schaltung für einen Elektromotor, insbesondere für einen Antriebsmotor von Materialzerkleinerungs- oder Preßanlagen

摘要

A motor (11) for document shredders, baling presses etc. is switched by an electronic controller (22) such that a main relay (15), which switches the total power, initially ensures that there is no electrical power to the entire motor in each case, before the changeover is carried out in a time-delayed manner via auxiliary relays (19, 20). The auxiliary relays can thus switch while not passing current and can thus be designed to be considerably smaller.