Canon Kabushiki Kaisha

Fdk Corporation

Shigeru Kameyama

Kenji Watanabe

Ryosuke Sato

Masayoshi Takahashi

Koji Kawamura

Jumpei Ashida

Kazuhiko Okazawa

Yuichiro Hori

Yukio Numakami

Hakaru Muto

Hisashi Enomoto

Yusuke Isomi

Tadashi Fukumuro

A motor control apparatus includes: an excitation unit configured to excite a plurality of excitation phases of a motor; a measurement unit configured to measure a physical amount that changes according to an inductance of at least one of a plurality of coils that make up the plurality of excitation phases by exciting each of the plurality of excitation phases, and generate measured data that includes measurement values of the physical amount measured for the plurality of excitation phases; and a determination unit configured to determine, based on the measured data, a rotational position of a rotor of the motor and whether or not at least one of the motor and the excitation unit has a failure.

Motor control apparatus that performs failure determination and determination of rotational position of rotor, and image forming apparatus

A motor control apparatus includes a voltage control unit and a current detection unit. The voltage control unit controls a voltage when applied to cause current to flow through the coils a motor that is detected by the current detection unit. When measurement processing is performed on a set from a plurality of sets of coils having two coils each, a first detection result is obtained by the coil current flowing from a first coil of the set to a second coil of the set. A second detection result then is obtained by the coil current flowing from the second coil to the first coil. The stop position of the rotor of the motor is determined based on the first detection result and the second detection result obtained for each of the plurality of sets of coils.

Motor control apparatus and image forming apparatus for determining stop position of rotor

A motor control apparatus, includes: a voltage control unit configured to control a voltage to apply to a plurality of coils in order to cause a rotor of a motor that includes the plurality of coils to rotate; a holding unit configured to hold information that indicates a magnitude of a load of the motor; and a detection unit configured to, based on the information that indicates the magnitude of the load that is held by the holding unit, set a detection condition for a stop position of the rotor, and perform detection processing of the stop position of the rotor in accordance with the set detection condition.

Motor control apparatus that performs processing for detecting stop position of rotor, and image forming apparatus

In a motor control apparatus, an exciting unit excites a plurality of excitation phases of a motor. A current measurement unit measures exciting currents flowing through coils of respective phases of the motor, and generates measurement data including measurement values of the exciting currents. A determination unit determines whether or not noise is superimposed on a measurement value included in the measurement data by comparing, with respect to each of the plurality of excitation phases, the measurement data regarding a first phase coil that constitutes that excitation phase with the measurement data regarding a second phase coil that constitutes that excitation phase.

Motor control apparatus and image forming apparatus

A motor control apparatus includes: a voltage control unit configured to control a voltage applied to a plurality of coils in a motor to supply an exciting current; a current detection unit configured to detect an exciting current having flown through the plurality of coils; and a detection unit configured to detect a stop position of a rotor of the motor by performing a detection process, in which the exciting current to at least a first coil of the plurality of coils is supplied by the voltage control unit, and the exciting current is detected by the current detection unit. The detection process includes a first period in which a first voltage of a first polarity is applied to the first coil, and a second period in which a second voltage of a second polarity is applied to the first coil.

Motor control apparatus for detecting stop position of rotor of motor and image forming apparatus

A motor control apparatus includes: a current detection unit configured to detect currents flowing through a plurality of coils of a motor, and includes a first detection unit that detects a current flowing through a first coil of the plurality of coils, and a second detection unit that detects a current flowing through a second coil of the plurality of coils; a determination unit configured to perform determination processing for determining a stopping position of a rotor of the motor based on a detection result of the current detection unit; and a calibration unit configured to calibrate the second detection unit based on a detection result of the first detection unit and a detection result of the second detection unit when a current is flowing in a series connection of the first coil and the second coil in the determination processing.

Motor control apparatus including current detection unit for detecting coil current and image forming apparatus

A printing system includes an image forming apparatus that accepts a printing instruction from a mobile terminal, sends an inquiry to a server as to whether a printing reservation corresponding to the accepted printing instruction is managed by the server, and transmits connection information to the mobile terminal if the printing reservation is managed by the server. The image forming apparatus obtains printing data corresponding to the printing instruction from the mobile terminal set in the connected state, executes printing processing using the obtained printing data, and sets communication with the mobile terminal to an unconnected state after execution of the printing processing is complete. If the printing reservation corresponding to the accepted printing instruction is not managed by the server, the printing instruction accepted from the mobile terminal is rejected and the connection information is not transmitted to the mobile terminal.

Printing system and related control method in which a printing apparatus connects with a mobile terminal if a printing reservation corresponding to a printing instruction from the mobile terminal is managed by a server

A control device comprises a driving unit configured to drive a plurality of coils of a multiple-phase motor by pulse width modulation; a detection unit configured to detect currents flowing through the plurality of coils in a time-division manner; and a change unit configured to change, in accordance with a duty in the pulse width modulation, a sequence of detecting the currents flowing through the plurality of coils by the detection unit.

Control device and control method

A first excess current protector directs a controller to limit an output current of a regulator when a current value detected by a current detector exceeds a first preset current value set to be higher than a rated current value of a power supply device. A second excess current protector directs the controller to limit the output current of the regulator when an average value of the current value detected by the current detector over a predetermined period of time exceeds a second preset current value set to correspond to the rated current value. A third excess current protector directs the controller to limit the output current of the regulator when the current value detected by the current detector exceeds a third preset current value set to be lower than the second preset current value.

Power supply device with excess current protection

A motor control apparatus includes a supply unit to supply a current for excitation to a plurality of coils of a motor, a first detection unit to detect a physical quantity which varies depending on a change in inductance of at least one of the plurality of coils, and a determination unit to determine a rotational position of a rotor of the motor. A control unit controls the rotational position of the rotor of the motor based on a determination result by the determination unit, and a second detection unit detects an inducted voltage of each of the plurality of coils. The determination unit also determines the rotational position of the rotor based on the detected physical quantity when the rotor is at rest and when a rotational speed of the rotor is smaller than or equal to a predetermined value, and determines the rotational position of the rotor based on the detected induced voltage when the rotational speed of the rotor is greater than the predetermined value.

Motor control apparatus for sensorless motor, and image forming apparatus

The image forming apparatus includes a plurality of rotation members for bearing respective images, a plurality of motors for driving and rotating the plurality of rotation members, respectively, a phase detector for detecting phases of the plurality of rotation members, and a phase adjusting device for carrying out adjustment so that phase differences among the plurality of rotation members have a predetermined relationship, in which the phase adjusting device carries out the adjustment before the motor in rotation is stopped, and stops the motor after completion of the adjustment. Accordingly, a first print time can be shortened without executing an unnecessary phase adjustment sequence after activating motors. Alternatively, after executing and completing the phase adjustment, the motors are stopped.

Image forming apparatus

An image forming apparatus is provided, which is capable of performing phase control of rotation bodies inexpensively and accurately and is capable of reducing time until completion of phase adjustment at the time of a print operation to prevent first print time from becoming long. This image forming apparatus includes a device for detecting a home position of rotation bodies, a motor, and a motor control device for controlling the motor by a software servo, in which said motor control device has a position control function with respect to the motor.

A color image forming apparatus has an intermediate transferring body or a driven roller speed detector that is driven by a conveying belt; a calculation device for calculating a difference between a target speed and the speed of the intermediate transferring body or of the conveying belt; and a drive controller for employing the speed difference obtained by the calculation device to correct the speed of the intermediate transferring body or of the conveying belt. In a low-speed printing mode, before an actual image is formed on a transfer material conveyed along the conveying belt or on the intermediate transferring body, speed correction is performed at the 1/1-speed and, after the speed correction has been completed, the speed in the low-speed mode is determined, and the speed correction for the intermediate transferring body or the conveying belt is not thereafter performed during the printing.

Image forming apparatus driving conveying medium or intermediate transferring medium and control method therefor

The invention detects vibrations of a motor by a vibration detection means, compares the detected vibration detection value with a reference value using control means, and changes the voltage to be applied to each of coils of the respective excitation phases until the vibration detection value reaches the reference value, thereby controlling the excitation currents that flow through the coils of the respective excitation phases to reduce the vibrations of the motor.

Growing community of inventors

Mishima, Japan

Shigeru Kameyama