Direct current motor drive apparatus

Details Direct current motor drive apparatus Direct current motor drive apparatus

1993-09-08

1995-11-21

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, 318135, H02K 2300

Patent

active

054690307

ABSTRACT:
A direct current motor drive apparatus generating low levels of heat is described. A pulse width modulation signal, generated by a pulse width modulator corresponding to a torque command signal, is applied to a Hall effect element. The Hall effect element then generates an output corresponding to the number of lines of magnetic force of a field magnet on the moving side. After this output is amplified by an operational amplifier, waveform shaping is performed by first and second comparators. The resulting signals are then amplified by first and second power amplifiers and supplied to excitation coils.
Since waveform shaping is performed on the signal applied to each of the power amplifiers mentioned above, the power amplifiers operate in a region of roughly complete switching, thereby suppressing the generation of heat.

REFERENCES:
patent: 3619749 (1971-11-01), Schieman
patent: 3716769 (1973-02-01), Brunner
patent: 4409526 (1983-10-01), Yamauchi et al.
patent: 4686437 (1987-08-01), Langley et al.
patent: 4922160 (1990-05-01), Ogawa
patent: 5162709 (1992-11-01), Ohi
patent: 5270631 (1993-12-01), Takahashi et al.

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