BLDCM phase current reconstruction circuit

Details BLDCM phase current reconstruction circuit BLDCM phase current reconstruction circuit

1995-02-07

1996-07-30

Sircus, Brian

Electricity: motive power systems

Switched reluctance motor commutation control

318805, H02P 506

Patent

active

055414842

ABSTRACT:
A phase current reconstruction circuit for reconstructing a plurality of phase current waveforms for a brushless direct current motor having a plurality of phase windings, wherein the circuit operates equally well at all motor voltage ranges. The circuit is comprised of a plurality of differential amplifiers for detecting and amplifying voltage signal fluctuations of the detected signal voltage across a plurality of sense resistors exhibiting a low voltage drop regardless of a motor operating voltage employed; a plurality of analog switches for selectively gating the amplified signal voltages with proper phase timing to reconstruct the phase current waveforms; and a plurality of output amplifiers for amplifying the reconstructed phase current waveforms.

REFERENCES:
patent: 4234838 (1980-11-01), Langley et al.
patent: 4353016 (1982-10-01), Born
patent: 4678973 (1987-07-01), Elliott et al.
patent: 4743815 (1988-05-01), Gee et al.
patent: 4928043 (1990-05-01), Plunkett
patent: 5187419 (1993-02-01), DeLange
patent: 5367234 (1994-11-01), Ditucci

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