Patent application number | Description | Published |
20120217702 | JAM PROCESSING ASSISTING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE JAM PROCESSING ASSISTING DEVICE - A jam-processing assisting device that performs a jam removal process for removing a sheet jammed at a carriage roller by rotating the carriage roller includes: a motor that drives the carriage roller to rotate; a rotation-direction detecting unit that detects a direction of rotation in which the motor is required to rotate for removing a jam; and a motor-driving controlling unit that drives the motor to rotate in the direction that has been detected. The rotation-direction detecting unit determines, based on a detection of a pulling-out direction in which the jammed sheet is pulled by an external force, the pulling-out direction that has been detected as the direction of rotation of the motor and drives the motor in the direction that has been determined. | 08-30-2012 |
20130078021 | ELECTRIC MOTOR SYSTEM AND MOTOR CONTROL METHOD - An electric motor system includes a brushless direct-current motor, a driver circuit, a position sensor, and a control circuit. The motor has an output shaft for transmitting torque. The driver circuit supplies power to the motor according to a control signal input thereto. The position sensor measures an angular, rotational position of the motor shaft. The control circuit controls operation of the motor. The control circuit includes a position sensor terminal, a reference terminal, a differential calculator, a controller, and a gain adjuster. The position sensor terminal receives a feedback signal. The reference terminal receives a reference signal. The differential calculator generates an error signal representing a difference between the measured and targeted rotational positions. The controller generates the control signal based on the error signal through a combination of control actions. The gain adjuster is connected to the controller to adjust a gain of each control action. | 03-28-2013 |
20130193894 | MOTOR CONTROL DEVICE, MOTOR CONTROL METHOD, AND COMPUTER-READABLE STORAGE MEDIUM - A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected. | 08-01-2013 |
20130200836 | MOTOR CONTROL DEVICE, IMAGE FORMING APPARATUS, MOTOR CONTROL METHOD, AND COMPUTER-READABLE STORAGE MEDIUM - A motor control device includes a motor lock state determining unit configured to determine whether a motor is in a rotation lock state; a position hold state determining unit configured to determine whether the motor is in a position hold state; a lock detection invalidation determining unit configured to invalidate the determination of the lock state when the motor is in the position hold state and when a predetermined condition is satisfied; a position error correction unit configured to correct an error of a target stop position of the motor when the determination of the lock state is invalidated; and a motor control unit configured to change a rotation direction of the motor in a time shorter than a time in which the motor lock state determining unit determines the lock state when the motor is in the position hold state after the error is corrected. | 08-08-2013 |
20130200838 | MOTOR CONTROL DEVICE, IMAGE FORMING APPARATUS INCLUDING THE MOTOR CONTROL DEVICE, AND MOTOR CONTROL METHOD - A motor control device to execute speed control and position control of motor simultaneously, includes a target position information provider, a target speed information provider, a detected position information detector, a processor to add position feedback information, position feed-forward information, speed feedback information, and speed feed-forward information for output as motor control information, based on the target position information, the setting target speed information, and the detected position speed information, a control voltage generator operatively connected to the processor to generate a control voltage to drive the motor in accordance with the motor control information, and a motor driver operatively connected to the control voltage generator and the motor to control rotation of the motor based on the control voltage. | 08-08-2013 |
20140049199 | MOTOR CONTROL DEVICE, MOTOR CONTROL METHOD, AND IMAGE FORMING APPARATUS - A motor control device supplies a drive control signal to a drive circuit that drives a motor at a constant period using a motor drive signal based on the drive control signal, and shuts off the motor drive signal when a count value counted by a counter that reset the count value if a state of the motor changes exceeds a threshold corresponding to a plurality of driving periods of the motor. The motor control device includes: a control unit that controls a setting unit to set a rotational direction of the motor to a first rotational direction and a second rotational direction reverse to the first rotational direction at the constant period alternately, when a drive mode of the motor is a position holding mode to drive the motor so as to hold a rotational position of the motor. | 02-20-2014 |
20150077027 | LOAD TORQUE ESTIMATION APPARATUS, IMAGE FORMING APPARATUS, LOAD TORQUE ESTIMATION METHOD AND NON-TRANSITORY COMPUTER-READABLE INFORMATION RECORDING MEDIUM - A load torque estimation apparatus inputs a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model to estimate load torque of the electric motor; and derives a mechanical time constant of the electric motor corresponding to the load torque estimated by the estimation part. The load torque estimation apparatus updates the mechanical time constant included in the model by using the mechanical time constant corresponding to the load torque estimated at an (n−1)th control period (where n denotes an integer greater than or equal to 2) and estimates the load torque of the electric motor at an nth control period by inputting the controlling value and the actually measured value acquired at the nth control period to the model acquired through the updating. | 03-19-2015 |
20150077028 | LOAD TORQUE ESTIMATION APPARATUS, IMAGE FORMING APPARATUS, LOAD TORQUE ESTIMATION METHOD AND NON-TRANSITORY COMPUTER-READABLE INFORMATION RECORDING MEDIUM - A load torque estimation apparatus estimates load torque of an electric motor. The apparatus includes an estimation part configured to input a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model and estimating load torque of the electric motor; and a derivation part configured to derive a mechanical time constant of the electric motor corresponding to the actually measured value of the rotational speed of the electric motor. The estimation part is configured to update, according to a timing of acquiring the actually measured value of the rotational speed of the electric motor, the mechanical time constant included in the model by using the mechanical time constant corresponding to the acquired actually measured value and estimate the load torque of the electric motor by using the updated model. | 03-19-2015 |