Electricity: motive power systems – Positional servo systems
Reexamination Certificate
2005-04-05
2005-04-05
Martin, David (Department: 2837)
Electricity: motive power systems
Positional servo systems
C318S609000, C318S615000, C318S623000, C318S624000, C318S651000, C318S685000
Reexamination Certificate
active
06876168
ABSTRACT:
In servomechanisms, like for example used in disk drives, disturbances, for example, friction, shock and vibration, prevent the system positioning accuracy from further improvement. These disturbances occur in a relatively low-frequency range compared to the electrical dynamics. In the present invention, an acceleration feedback control loop using a frequency-separated acceleration soft sensor (350) replaces the conventionally used current control loop in the low frequency range, where the disturbances occur, so as to attenuate the influence of the disturbances enclosed in the loop. The current feedback continues to manage the electrical dynamics in the high-frequency range. Estimating the required acceleration signal by a soft sensor (350) eliminates the need for physical accelerometers, which reduce system reliability and increase system cost. The acceleration feedback control loop constructed with the obtained acceleration signal also makes the system more robust to the parameter inaccuracies and variations within the loop. This invention can be easily implemented with either software or hardware.
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Ge Shuzhi
Lee Tong Heng
Luo Yaolong
Dinsmore & Shohl LLP
Martin David
Miller Patrick
National University of Singapore
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