Electricity: motive power systems – Positional servo systems
Reexamination Certificate
2006-02-24
2009-12-29
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Positional servo systems
C318S568170, C318S632000, C318S721000
Reexamination Certificate
active
07638965
ABSTRACT:
A velocity control loop of a motor control apparatus including a notch filter. The notch filter attenuates a signal component at a central frequency from a motor driving command, and outputs the attenuated motor driving command. The driving of a motor is controlled based on the attenuated motor driving command. The central frequency of the notch filter is set equal to a frequency at which a phase of open loop frequency characteristics of the velocity control loop that does not include a notch filter is a value obtained by subtracting 180 degrees from a preset phase margin. An attenuation factor of the notch filter by which the signal component at the central frequency is attenuated is set so that a gradient of a phase diagram of the open loop frequency characteristics of the velocity control loop including the notch filter is substantially zero.
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Mitsubishi Electric Corporation
Paul Antony M
Ro Bentsu
Sughrue & Mion, PLLC
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