Ricoh Company, Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Kaneka Corporation

Panasonic Corporation

Nec Solution Innovators, Ltd.

Nec Soft, Ltd.

Hiroshi Fujiwara

Haruyuki Honda

Toshikane Nishii

Tomoyoshi Yamazaki

Mizuna Tanaka

Ippei Kimura

Yasuhide Ohkubo

Masafumi Takahira

Toru Tazawa

Kazuyoshi Kondo

Shigeo Nanno

Masaru Nishizono

Yasuo Matsuyama

Kazuhiro Wakamatsu

Yoshihide Ohta

Kenta Murakami

Fuminobu Hirose

Fumitake Saegusa

Kenichi Suzuki

Toru Yoshida

Youichi Oohara

Takeshi Sato

Yu-suke Imada

Hiroshi Hosokawa

Tomohiro Kubota

Yasunobu Shimizu

Takahiro Hayashi

Kazuki Matsumoto

Ikuo Fujii

Tomofumi Inoue

Takeru Muramatsu

Jun Fukuzawa

Osamu Kobayashi

Hiroshi Kobayashi

Akinori Harada

Yoshiaki Ikeuchi

Ken'ichi Suzuki

Mitsutaka Okura

Akinobu Tomita

Yuya Sakamoto

Akira Furukawa

Yusuke Kuboi

Yuta Shiraki

Motor control device controls motor that moves load to a target position. Motor control device includes prediction part, correction command generator, corrector, and controller. Prediction part acquires one or more target position deviations and a target settling time, and calculates a predicted target position deviation indicating a difference between a position of load and the target position at the target settling time based on the one or more target position deviations and the target settling time. When the predicted target position deviation indicates that load does not reach within a predetermined range from the target position, correction command generator generates a correction command for correcting a position command based on the predicted target position deviation. Corrector acquires the position command, corrects the position command based on the correction command, and generates a corrected position command Controller controls motor based on the corrected position command and a position of motor.

Motor control device

An oscillation information calculation device includes: a sensor information obtainer that obtains time series position information on a motor as detected by a position detector, and time series sensor information on a movable part as detected by a sensor attached to the movable part, the movable part being connected to the motor via a joint; and an information calculator that calculates and outputs at least one of oscillation presence/absence information, oscillation frequency information, or oscillation causal information, based on the time series position information and the time series sensor information, the oscillation presence/absence information indicating presence or absence of oscillation of the motor and the movable part, the oscillation frequency information indicating an oscillation frequency of the motor and the movable part, the oscillation causal information indicating a cause of the oscillation of the motor and the movable part.

Oscillation information calculation device, oscillation information calculation method, and non-transitory computer-readable recording medium

A pressing mechanism includes a compression spring, a supporter, and a holder. The compression spring has one end facing a pressing body to bias the pressing body against a target object in a biasing direction. The supporter supports another end of the compression spring. The holder holds the supporter and includes multiple holding portions having different heights to hold the supporter at different positions in the biasing direction. The multiple holding portions are disposed at different positions in a circumferential direction of the supporter.

Pressing mechanism, a process cartridge, and an image forming apparatus

Motor control system includes controller, motor control device, and position detection device. In controller, an operation command plan for a movement plan during a period until moving part reaches a target position from an initial position is set. Controller outputs, as an operation command, a movement amount of the moving part at a current point in time based on the operation command plan. Motor control device generates a drive signal for drive device based on an operation command Position detection device detects a position of moving part, and outputs a first position. Motor control device generates a deviation amount of moving part from the target position based on a future movement distance of moving part based on a future operation command, the first position, and the target position. Motor control device outputs a notification signal in a case where the deviation amount is more than or equal to a threshold.

Motor control system, motor control device, and motor control method

A motor control system includes a control unit and a compensator. The control unit controls an operation of a shaft of a motor in accordance with an operation command for the motor. The compensator calculates compensation information based on an other-shaft information about an operation of another shaft of another motor different from the motor. The compensation information is information for compensating an influence of the operation of the other shaft upon the shaft. The control unit controls the operation of the shaft using the compensation information calculated by the compensator.

Motor control system, motor control method, and program

A damping device includes: a housing; a drive-side actuator that includes a drive-side stator and a drive-side mover and is connected to the housing; a damping-side actuator that includes a damping-side stator and a damping-side mover and is connected to the housing; a first signal calculator that generates a drive signal for the drive-side actuator based on a control command; and a second signal calculator that generates, when the drive-side actuator changes from a large to a small jerk state, a drive signal for the damping-side actuator based on a signal obtained by subtracting a displacement suppression command suppressing a displacement of the damping-side mover from a vibration suppression command reducing or offsetting, by a vibration component of the housing produced by driving of the damping-side actuator, a natural frequency component of the housing produced by driving of the drive-side actuator based on the control command.

Damping device

A motor drive device includes: a position command generator which generates a position command; a damping filter unit which includes one or more stages of damping filters which reduce vibration of a device including a load and a motor, applies, to a position command, a damping filter determined based on a model parameter corresponding to a model of the device, and outputs a filtered position command to which the damping filter has been applied; a servo controller which gives a torque command to the motor based on the filtered position command; a low-pass filter unit; a parameter estimation unit which estimates the model parameter from the rotational speed and the torque command of the motor which have passed through the low-pass filter unit; and a vibration determination unit which determines presence or absence of vibration in the model.

Motor drive device and servo adjustment method

An image forming apparatus includes an apparatus body and a detachable unit to be attached to the apparatus body in an attachment direction and detached from the apparatus body in a detachment direction. The detachable unit includes a rotary body and a unit drive gear. The apparatus body includes an apparatus-body drive gear to engage with the unit drive gear of the detachable unit attached in the apparatus body, at an engageable position on a downstream side of the apparatus-body drive gear in the attachment direction. One or each of the unit drive gear and the apparatus-body drive gear moves to a retracted position at which the one or each of the unit drive gear and the apparatus-body drive gear does not engage with the other of the unit drive gear and the apparatus-body drive gear and does not interfere with attachment and detachment operations of the detachable unit.

Image forming apparatus having an apparatus body and a detachable unit including a rotary body and drive gear

An electric motor control device includes a feedforward controller, a feedback controller, and an adder-subtractor. The feedforward controller receives a position command signal to specify a target position of a control target load and outputs signals representing a target position, target speed and torque of the electric motor. The feedback controller outputs a feedback torque command signal representing a torque command to perform feedback control in such a manner that an electric motor position signal and a feedforward position command signal coincide with each other. The adder-subtractor subtracts a load acceleration feedback torque signal obtained by multiplying a load acceleration signal representing acceleration of the control target load by a load acceleration feedback gain from a torque command signal obtained by adding a feedforward torque command signal and the feedback torque command signal, and outputs a result of the subtraction as a torque command correction signal.

Device for controlling electric motor

An electric motor control device includes a position controller, a command acceleration calculator, a first subtractor, and a second subtractor. The position controller receives a position command signal specifying a target position of the load and an electric motor position signal representing a position of the electric motor that drives the load, and outputs a torque command signal. The command acceleration calculator receives the position command signal and outputs a command acceleration signal representing acceleration of the position command signal. The first subtractor subtracts the command acceleration signal from a load acceleration signal representing acceleration of the load and outputs a load acceleration correction signal. The second subtractor subtracts from the torque command signal a value obtained by multiplying the load acceleration correction signal by a predetermined weighting coefficient and outputs a torque command correction signal. The torque command correction signal controls a current supplied to a stator winding wire of the electric motor.

Control device for electric motor

A foam molding article includes an outer-shell-configuring part, an insert that is at least partially embedded in the outer-shell-configuring part, and a fitting member. The outer-shell-configuring part includes a body side foam member. The body side foam member includes a foam and a missing part where a part of the foam is missing. The missing part is located in an intermediate part of the body side foam member, and the fitting member is mounted in the missing part.

Foam molded article, method for manufacturing molded foam article, and seat for automobile

A motor control system includes motor control devices and a controller. The controller generates and transmits a communication signal including an operation command to the respective motor control devices. The motor control devices include two motor control devices in a first group, each of which includes a data transceiver, a motor controller, a corrector, and a synchronous timing generator, and a motor control device in a second group. The data transceiver receives an operation command issued to the motor control device, and receives operation information in the motor control device in the second group. Based on the operation command, the motor controller generates a torque command signal. The corrector generates a torque correction signal based on the operation information, and corrects the torque command signal. The synchronous timing generator generates a timing signal that matches pieces of process timing of the motor controllers in the first group with each other.

Motor control system

An electric motor control device performing feedback control of a state amount of an electric motor or a load and being capable of changing a control bandwidth of a feedback control system includes: a notch filter arranged in the feedback control system and having a filter coefficient which is changeable; a notch control section which changes a notch frequency as a center frequency of the notch filter to remove an oscillation component attributable to mechanical resonance related to the electric motor; and a control coefficient setting section which changes at least one of the control bandwidth or the filter coefficient of the notch filter in accordance with the control bandwidth and the notch frequency to stabilize the feedback control system.

Electric motor control device and electric motor control method

A motor control device is configured to feedback-control state quantity of a motor or a mechanical load, and the device includes a first notch filter disposed inside a feedback control system and configured to change a frequency component to be removed, a first notch controller configured to change a first notch frequency as a center frequency of the first notch filter, a change rate calculator configured to successively calculate a notch frequency change rate indicating a change amount per unit time of the first notch frequency, and a change rate monitor configured to output a signal indicating that the notch frequency change rate has a value outside a first predetermined range when the notch frequency change rate has the value outside the first predetermined range.

Motor control device and motor control method

The invention provides a motor control device configured to feedback-control state quantity of a motor or a load, the device including a first notch filter disposed inside a feedback control system and configured to change a frequency component to be removed, a first notch controller configured to change a first notch frequency as a center frequency of the first notch filter, and a change forecaster configured to calculate to output, in accordance with the first notch frequency at each of a plurality of past times, at least one of a forecast value of the notch frequency at a specific future time, a forecast value of elapsed time from current time until the notch frequency is to become out of a specific frequency range, and a forecast value of time when the notch frequency is to become out of the specific frequency range.

Growing community of inventors

Osaka, Japan

Hiroshi Fujiwara