Phase detecting circuit of brushless motor and magnetic recordin

Details Phase detecting circuit of brushless motor and magnetic recordin Phase detecting circuit of brushless motor and magnetic recordin

1997-05-27

1999-07-06

Martin, David

Electricity: motive power systems

Switched reluctance motor commutation control

318606, 318607, 318678, A02K 2300

Patent

active

059201630

ABSTRACT:
A differential amplifier amplifies a PG reproduction signal to a level permitting signal processing. A low-pass filter makes the signal waveform of a PG detection signal generated by the differential amplifier substantially uniform irrespectively of the rotational speed of a rotating drum. A comparator outputs a PG pulse by comparing an output of the low-pass filter with a threshold. A magnetic recording and reproducing apparatus having such a structure can detect the PG pulse with accuracy over a rotational speed range requiring a precision control of the rotating drum.

REFERENCES:
patent: 4010463 (1977-03-01), Kay
patent: 5473725 (1995-12-01), Chen et al.
patent: 5569988 (1996-10-01), Kokami et al.
patent: 5789891 (1998-08-01), Nakane

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