Frequency generator circuit for a brushless DC motor control sys

Electricity: motive power systems – Switched reluctance motor commutation control

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Details

318254, 318138, 318439, 318560, 318569, 318594, 318600, 318601, H02K 2300

Patent

active

060669292

ABSTRACT:
A brushless direct current motor driving circuit includes a data generator adapted to receive a first signal corresponding to a rotor position and to generate a digital data signal therefrom, a clock signal generator adapted to receive phase voltage signals and back electromotive force (BEMF) signals from a motor and to generate a clocking signal therefrom, and a data output block coupled to the data generator and the clock signal generator and adapted to receive the data signal and the clocking signal such that the digital data is clocked into the data output block as a result of the BEMF signals to produce a frequency signal to be used in controlling the velocity of the rotor. Switching noise present together with the BEMF signals is rejected by the clock signal generator so that the frequency signal is substantially free from switching noise, thereby allowing a velocity controller to provide more precise velocity control of the rotor.

REFERENCES:
patent: 4528486 (1985-07-01), Flaig et al.
patent: 5466997 (1995-11-01), Utenick et al.
patent: 5818179 (1998-10-01), Utenick et al.
patent: 5998946 (1999-12-01), Kim

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