Kollektorloser Gleichstrommotor mit Dauermagnetläufer und Hallgeneratorsteuerung

摘要

A brushless DC motor comprises switching means coupled to and controlled in condition by a comparator circuit. The control current terminals of a pair of Hall effect generators are connected to the negative polarity terminal of a DC voltage source through the switching means. The base electrodes of four coupling transistors are connected to each other. Each pair of coupling transistors are connected to a corresponding pair of the winding branches of the motor which are mutually displaced electrically by 180 DEG . There are four power transistors. The collector electrode of each coupling transistor of a pair of coupling transistors is connected to the base electrode of the power transistor connected to the other of the corresponding pair of winding branches. A voltage proportional to the speed of rotation of the rotor at the emitter-base paths of the coupling transistors is provided at the winding branches.