Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Nec Corporation

Tomohiro Miyazaki

Hidetoshi Ikeda

Tetsu Koyama

Shuya Sano

Hiroshi Matsumura

Yorimasa Yasuda

Shinichi Koike

Provided is a control device that includes a plurality of communication units that receive data from measurement control devices; a control unit that calculates an operation signal for controlling a controlled device on the basis of the data from the communication units and that outputs the operation signal to the controlled device; a storage unit that stores the data; a first monitoring unit and a second monitoring unit that perform a calculation on the basis of the data to calculate a calculation value, that determine whether the calculation value satisfies a blocking condition, and that output a blocking signal when the calculation value satisfies the blocking condition; and a first blocking unit and a second blocking unit that block the operation signal to the controlled device upon receiving the blocking signal output from at least either one of the first monitoring unit and the second monitoring unit.

Control device and control method for blocking a control signal to a target device

A servo selection system includes a replacement-information display unit that displays at least a portion of replacement information corresponding to an input servo product before being replaced and a selected new-model servo product, and the replacement information includes a difference between a specification of the servo product before being replaced and a specification of the new-model servo product, and an operation guideline for replacing the servo product before being replaced with the selected new-model servo product.

Servo selection system

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.

Motor control apparatus

A speed control meansfor outputting a drive command signal for a motorto make the speed of the motorconform to the speed command signal based on a signal indicating the difference between the speed command signal and the detected speed of the motor; a filterinserted in series with the speed control meansin the speed control loop, having a high frequency domain, a low frequency domain, and an intermediate frequency domain between the high frequency domain and the low frequency domain, a gain KL in the low frequency domain being larger than a gain KH in the high frequency domain, and having a phase lag characteristic so that the phase in the intermediate frequency domain is delayed; the speed control meanshaving a proportional controllerthat multiplies input by a proportional gain KP and outputs the result, and the filterbeing set so that phase lag occurs between a resonance frequency and an anti-resonance frequency of a mechanical system.

Motor control device

A speed control apparatus includes a speed control partfor generating a source current command based on a difference between a speed command of a motorand speed detection in which a speed of the motorfor driving a loadis detected, a notch filterwhich can break a notch frequency resulting in a predetermined frequency selected among continuous frequency band widths and also generates a compensating current command in which the notch frequency is eliminated from the source current command signal, a notch filter adaptive partfor selecting the notch frequency so that the compensating current command in which a sustained vibration frequency component of the source current command is eliminated is generated from the notch filter, a subtracterfor generating an elimination portion current command resulting in a difference between the source current command and the compensating current command, and an adderfor adding the compensating current command and the elimination portion current command and generating a current command passed through the motor

Speed control apparatus of motor

A FSK code with reduced high frequency content is generated. First through fourth waveforms are provided to a selector which selects one of the four waveforms in accordance with a control signal which, in turn, is generated in accordance with a state indication signal identifying the presently selected one of the four waveforms. A D/A converter converts the selected digital waveform data to an analog waveform signal. First and second of the digital waveform data represent +sin .theta. and -sin .theta., and third and fourth of the digital waveform data represent +f(.theta.) and -f(.theta., respectively, where ##EQU1## wherein 0.ltoreq..theta..ltoreq.2.pi. and a, b and c are nonzero coefficients.

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Tokyo, Japan

Tomohiro Miyazaki