Electricity: motive power systems – Positional servo systems
Patent
1999-01-13
2000-11-28
Ip, Paul
Electricity: motive power systems
Positional servo systems
318561, 360 7702, 360 7704, 360 75, G11B 2102, G11B 5596, G11B 556
Patent
active
06153997&
ABSTRACT:
A disk apparatus has a position signal detector for detecting the position of a head with a specified sampling period, a controller operating a manipulated variable to control positioning of the head using a microprocessor and a digital/analogue converter with which the manipulated variable is converted. At least one or more timing registers set the timing of the conversion carried out by the D/A converter and at least one or more manipulated variable registers set a manipulated variable that is converted into digital/analogue form at the set timing. In addition, the controller has advancing means to make a target position trajectory advance towards a specified time, a feedforward controller to receive the output of the advancing means and to calculate a feedforward control variable on the basis of a target trajectory, and a feedback controller to produce a feedback output variable on the basis of a target trajectory that is delayed relative to a target position trajectory by a specified time.
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Hata Yuji
Kobayashi Masahito
Oshimi Iwao
Shioya Akio
Soyama Yoshio
Hitachi , Ltd.
Ip Paul
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