Current control of brushless DC machines - has transistor stages controlled to maintain valve by regulator circuit including shaping unit and hysteresis comparator

摘要

The dc pulse converter is for use with brushless dc rotary machines and has a controlled semi-conductor in the main current circuit, operating together with a second one, to provide current control independent of magnitude and direction of load. The current circuit has two transistors (11, 15) that are controlled by a regulating stage (16). The brushless d.c. machine has three windings (5, 6, 7) with switches controlled by a commutator electronic control. A current monitoring point (17) provides a comparison value with the reference (J SOLL). Any resulting error signal is passed through to a shaping circuit (18, 19, 20, 21) including a driver element (19), a hysternesis comparator (20), with outputs used to control the transistors.