Linear current source amplifier for brushless DC motor

Details Linear current source amplifier for brushless DC motor Linear current source amplifier for brushless DC motor

1991-02-27

1993-03-16

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 318798, H02K 2900

Patent

active

051947862

ABSTRACT:
There is provided a linear current source amplifier for brushless DC motors with linear characteristic and low noise at high currents. A servo current loop for comparing a desired current with the actual winding current is provided to produce a global error signal. A plurality of linear current followers or power stages are configured such that each one of them is capable of providing a current to motor winding proportional to error signal. The power stages are arranged so that a local feedback signal proportional to the current supplied by the power stage is fed back and compared with a signal proportional to the global error signal to drive the current sources. The multiple power stage current sources in one embodiment are configured in a current loop fashion to energize the motor windings.

REFERENCES:
patent: 4061952 (1977-12-01), Dinsdale et al.
patent: 4348632 (1982-09-01), Galwey et al.
patent: 4922169 (1990-05-01), Freeman
patent: 4977356 (1990-12-01), Otani et al.
patent: 4978895 (1990-12-01), Schwarz
patent: 4990893 (1991-02-01), Moren et al.

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