Brushless d-c motor system

Details Brushless d-c motor system Brushless d-c motor system

1977-03-17

1978-07-04

Rubinson, Gene Z.

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

318254, 318439, H02K 2900

Patent

active

040991040

ABSTRACT:
To improve low noise operation of a brushless permanent magnet d-c motor, and reduce voltage peaks and stresses on switching transistors connected in series with stator windings thereof, a galvanomagnetic sensing element, such as a Hall generator, is located on the stator positioned in the gap between adjacent poles and subjected to stray leakage flux from the stator poles in such a way -- for example by means of soft-iron flux guide elements -- that the leakage field from the stator pole which is oppositely poled -- at any instant of operation -- to the rotor pole which controls operation of the galvanomagnetic sensing element provides a counter-acting flux to the galvanomagnetic sensing element, thus flattening the turn-off flanks of control pulses controlling current flow through the stator winding.

REFERENCES:
patent: 3716769 (1973-02-01), Brunner
patent: 3840761 (1974-10-01), Muller
patent: 3873897 (1975-03-01), Muller
patent: 4030005 (1977-06-01), Doemen

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