PROCEDE DE REGLAGE DE LA FREQUENCE DE ROTATION D'AU MOINS UN MOTEUR ASYNCHRONE ET REGULATEUR METTANT EN APPLICATION LEDIT PROCEDE

摘要

A signal (which is proportional to the rotation speed) is formed by voltage measurement in the rotor winding before opening a thyristor changeover switch in the rotor circuit. The switching signal for the thyristor is produced in the event of a specific value being exceeded. After the thyristor opens, the signal disappears. A corresponding situation applies to each successive thyristor. The device comprises a series circuit of an element (11) having a controllable response threshold and a rotation-speed pulse control unit (1), which contains a pulse former (12) connected to a pulse distributor (3) and is connected via said pulse distributor (3) to the control input (4) of a thyristor changeover switch (5) in the rotor winding. The input (13) of the element (11) with a controllable response threshold is connected to the output (14) of the thyristor changeover switch (5). <IMAGE>