Control apparatus for brushless dc motors

Electricity: motive power systems – Switched reluctance motor commutation control

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318138, H02P 602

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active

047407344

ABSTRACT:
A control apparatus for a brushless dc motor comprises: a parallel connection circuit including a plurality of series circuits connected in parallel; each series circuit having one armature coil and one field-effect transistor, one end of the parallel connection circuit being connected to one end of a dc power source; a free-wheeling diode connected across the parallel connection circuit; first semiconductor switch means connected between the other end of the parallel connection circuit and the other end of the dc power source; a plurality of second semiconductor switch means connected between respective gates of the field-effect transistors; and the one end of the dc power source; a plurality of reverse current blocking elements for preventing reverse currents from flowing into the second semiconductor switch means from the gates of the field-effect transistors; a plurality of comparators for detecting induced voltages developed across the armature coils; a drive circuit responsive to detection output signals from the comparators for sequentially driving the second semiconductor switch means so that the field-effect transistors are turned on and off to sequentially control the energization of the armature coils; and a rotor comprising a permanent magnet having a plurality of magnetic poles which is driven by magnetic fields produced by the sequential energization of the armature coils.

REFERENCES:
patent: 4250435 (1981-02-01), Alley et al.
patent: 4409524 (1983-10-01), Nielsen et al.
patent: 4455513 (1984-06-01), Fulton et al.
patent: 4495450 (1985-01-01), Tokizaki et al.
"Brushless Motor Drive for In-Tank Fuel Pump", General Motors Research Laboratories, 840445, pp. 57-63.
"P.M. Brushless Motor Drives", Proc. Annu. Symp. Incremental Motion Control System Devices, 9th., pp. 315-312.
"Microcomputer-Controlled Brushless Motor Without a Shaft-Mounted Position Sensor", Ipec-Tokyo 1983 pp. 1477-1488.

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