Brushless d.c. motor having RC time-delay stage(s) and driver tr

Details Brushless d.c. motor having RC time-delay stage(s) and driver tr Brushless d.c. motor having RC time-delay stage(s) and driver tr

1985-07-22

1988-05-31

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02K 2908

Patent

active

047483881

ABSTRACT:
In a two-conductor, two-pulse brushless d.c. motor (10) driver transistors (44, 45) are provided for the end-stage transistors (52, 53) and are connected at a control electrode thereof to a potential (point 47) which, e.g., amounts to half the supplied d.c. voltage. These driver transistors are activated by a Hall-IC (32) having a digital signal (41). In order to avoid an abrupt switchover from one conductor (25) to the other conductor (26), each driver transistor (44, 45) has its own RC-stage (43', 46' or 43", 46"). In this way one produces currentless gaps between successive stator-current pulses and implements a relatively soft switching of the end-stage transistors, so that the motor is caused to run quietly.

REFERENCES:
patent: 4030005 (1977-06-01), Doemen
patent: 4374347 (1983-02-01), Muller
patent: 4379984 (1983-04-01), Muller

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