Driver circuit for a d.c. motor without commutator

Details Driver circuit for a d.c. motor without commutator Driver circuit for a d.c. motor without commutator

1991-06-24

1992-07-28

Ro, Bentsu

Electricity: motor control systems

Specific control circuit element or device

Sawtooth or ramp waveform generator

318138, 318254, H02P 602

Patent

active

051346826

ABSTRACT:
A method is disclosed for the low-loss regulation of a d.c. motor without commutator and of a semiconductor circuit in which, during a commutation phase at reduced motor power or rpm as given by a position indicator, the end transistors or one end transistor initially operates temporarily as a switch and thereafter temporarily as an analog amplifier element. During the analog period, a current is available which changes slowly according to a ramp function.

REFERENCES:
patent: 3437826 (1969-04-01), Kelley
patent: 4368411 (1983-01-01), Kidd
patent: 4779183 (1988-10-01), Mutoh et al.
patent: 4804892 (1989-02-01), Muller
patent: 4839570 (1989-06-01), Saganovsky
patent: 4845412 (1989-07-01), Ichihara

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