Mains independent braking circuit for series wound or universal motor - having split or single field winding and armature also at least one 2-pole changeover switch having three pairs of contacts

摘要

Each change contact (6,7), together with the associated lazy contact (8,9), forms a normally closed switch and, together with the associated working contact (11,12), forms a normally open switch. A storage unit (25) serves for the compulsory starting of the self-excitation, and is charged by the mains voltage during the mains operation. After the change-over to braking mode, the corresp. part of the field winding (3) and the armature (2) lie in a continuously closed current circuit. A diode (23) lies in parallel to the corresp. part of the field winding (3) in the braking mode. The diode is so poled that current does not flow through it from the current circuit. ADVANTAGE - Reliably prevents collapse of self-excitation during braking due to diode lying in parallel with field winding.