Brushless direct current motor with magnetically operated commut

Details Brushless direct current motor with magnetically operated commut Brushless direct current motor with magnetically operated commut

1981-07-27

1984-10-02

Smith, Jr., David

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02K 2900

Patent

active

044750684

ABSTRACT:
Current to the stator coils 21-24 of a brushless DC motor is commutated by making transistors 42 and 43 alternately conductive by current through magnetically actuated switches 37 and 33 (or 51 and 52). These switches are actuated by magnetic fields from the permanently magnetized poles of a magnet 31 (or 47) attached to, but spaced from the rotor 11 and the stator poles 17-20. Depending on the polarity of the magnetic fields, the switches 37 and 33 (51 and 52) permit one of the transistors 42 or 43 to be biased by a voltage source that causes that transistor to become conductive and, simultaneously, connects the base of the other transistor to a voltage that causes that transistor to become non-conductive. Conductivity of the transistors 42 and 43 alternates as the rotor 11 rotates.

REFERENCES:
patent: 2705770 (1955-04-01), Suhr
patent: 3375422 (1968-03-01), Boudigues
patent: 3678359 (1972-07-01), Peterson
patent: 3900780 (1975-08-01), Tanikoshi
Type UGN-3013T Solid-State Ultra Low Cost `Hall Effect` Digital Switches, Sprague, 10-2-78.

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