Commutator motor for electric machine tool - has magnetic short circuit stator with single OFF and changeover switch for switching and short-circuiting

摘要

The commutator motor stator has a pole system, with pole part or commutator poles. Alternately there are two or three pole parts, and the motor is connected via an OFF and change-over switch such that in its operational position (E) the current flows in a specified direction. In the switch OFF position (F) the motor is short circuited and the induction current of the armature flows in an opposite direction. The short circuiting is carried out in such manner that the portion of the armature induction current, blocked by Zener diodes (19), flows through the excitation coil (3) and the commutator pole coil (2). The armature induction current portion, not blocked by the Zener diodes, flows only through the commutator pole coil for soft, rapid motor braking. ADVANTAGE - High power motor with improved commutation and braking.