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    Motor controller, image forming apparatus and motor controlling method
    1.
    发明授权
    Motor controller, image forming apparatus and motor controlling method 有权

    公开(公告)号：US10651765B2

    公开(公告)日：2020-05-12

    申请号：US15888934

    申请日：2018-02-05

    Applicant: Konica Minolta, Inc.

    Inventor： Daichi Suzuki ,  Yuta Tachibana ,  Hiroyuki Yoshikawa ,  Yasuhiro Koide

    IPC: H02P6/08 ,  H02P6/28 ,  H02P27/08 ,  H04N1/00 ,  H02P21/18 ,  H02P6/18 ,  H02P6/17

    Abstract: A motor controller includes: a velocity calculation unit for obtaining an angle θ(n), which shows a rotation position, and an angular velocity ω(n) of a rotor at a time point n; a compensation amount calculation unit for calculating a compensation angle Δθ by which the rotor advances from the time point n to a (n+1)th control cycle (a control cycle starting from a time point n+1), based on an angular acceleration a(n) of the rotor, an angular velocity ω(n) of the rotor at the time point n and a time length T of the control cycle; and a PWM inverter for controlling a voltage to be applied to a coil such that a rotating magnetic field based on a rotation position of the rotor advanced by the compensation angle Δθ from the rotation position of the rotor at the time point n is formed in the (n+1)th control cycle.

    Image forming device that detects a state of an image carrier
    3.
    发明授权
    Image forming device that detects a state of an image carrier 有权

    公开(公告)号：US10474079B2

    公开(公告)日：2019-11-12

    申请号：US16243774

    申请日：2019-01-09

    Applicant: KONICA MINOLTA, INC.

    Inventor： Akihiro Hayashi ,  Yuhei Tatsumoto ,  Koji Ohara ,  Makoto Shimazoe ,  Yasuhiro Koide

    IPC: G03G15/00

    Abstract: An image forming device includes: a conductive roller that abuts an image carrier to rotate; a power supply circuit that applies voltage to the roller; a controller that controls the power supply circuit so as to apply the voltage to the roller over a predetermined detection period in a state in which the image carrier and the roller are rotated; a detection value acquirer that acquires a detection value acquired by the application of the voltage indicating a state of the image carrier in the detection period; and a state detector that detects a state of the image carrier on the basis of a plurality of acquired detection values, wherein a length of the detection period is set to a length at which both the numbers of rotations of the image carrier and the roller from a start of the detection period are integers.

    Image forming apparatus having variable developing roller voltage change
    4.
    发明授权
    Image forming apparatus having variable developing roller voltage change 有权

    公开(公告)号：US09632447B2

    公开(公告)日：2017-04-25

    申请号：US15041613

    申请日：2016-02-11

    Applicant: Konica Minolta, Inc.

    Inventor： Yuhei Tatsumoto ,  Katsuhide Sakai ,  Yasuhiro Koide ,  Yuta Tachibana

    IPC: G03G15/02 ,  G03G15/06

    CPC classification number: G03G15/0266 ,  G03G15/065

    Abstract: An image forming apparatus includes: a photosensitive member rotated in a predetermined direction; a charging unit configured to charge a circumferential surface of the photosensitive member; a developing unit carrying a developer including toner and carriers, and including a developer bearing member configured to apply toner charged in a first polarity to the circumferential surface of the photosensitive member; a first voltage applying unit configured to apply a first voltage of the first polarity to the charging unit; a second voltage applying unit configured to apply a second voltage of the first polarity to the developer bearing member; a first voltage detecting unit configured to detect the first voltage; a second voltage detecting unit configured to detect the second voltage; and a controller, wherein the controller determines whether or not to make a second rate lower than a first rate according to the second voltage at a first timing.

    Image forming device
    5.
    发明授权
    Image forming device 有权

    公开(公告)号：US11300911B2

    公开(公告)日：2022-04-12

    申请号：US17315877

    申请日：2021-05-10

    Applicant: KONICA MINOLTA, INC.

    Inventor： Yasuhiro Koide ,  Yoshihito Sasamoto ,  Makoto Shimazoe ,  Yuhei Tatsumoto

    IPC: G03G15/00

    Abstract: An image forming device includes: a transfer unit transferring a toner image to a sheet; a resistance measurement member disposed on the upstream side in a sheet carriage direction of the transfer unit and for measuring resistance of the sheet; a charge elimination member disposed between the transfer unit and the resistance measurement member in the sheet carriage direction; a first voltage applying unit applying voltage for resistance measurement to the resistance measurement member; and a second voltage applying unit applying voltage of reverse bias of the voltage for resistance measurement to the charge elimination member. The width of a charge elimination region by the charge elimination member is wider than that of a charged region by the resistance measurement member in a direction perpendicular to the sheet carriage direction. The absolute value of the voltage for charge elimination is smaller than that of the voltage for resistance measurement.

    Controller for permanent magnet synchronous motor, control method, and image forming apparatus
    6.
    发明授权
    Controller for permanent magnet synchronous motor, control method, and image forming apparatus 有权

    公开(公告)号：US10141877B2

    公开(公告)日：2018-11-27

    申请号：US15784347

    申请日：2017-10-16

    Applicant: KONICA MINOLTA, INC.

    Inventor： Yasuhiro Koide ,  Yuta Tachibana ,  Daichi Suzuki ,  Hiroyuki Yoshikawa

    IPC: H02P21/00 ,  H02P21/06 ,  H02P25/03 ,  H02P6/18

    Abstract: A method for controlling a permanent magnet synchronous motor having a rotor using a permanent magnet, the rotor rotating by a rotating magnetic field caused by a current flowing through an armature is provided. The method includes: presuming, based on a target speed and an estimated speed that is an estimated value of a rotational speed of the rotor, whether or not a step-out occurs; correcting, when it is presumed that a step-out occurs, an estimated angle that is an estimated value of a position of magnetic poles of the rotor; and controlling, based on a post-correction estimated angle that is the estimated angle after the correction, a current flowing through the armature to cause the rotating magnetic field rotating at the target speed.

    Image forming apparatus
    8.
    发明授权
    Image forming apparatus 有权

    公开(公告)号：US10768562B2

    公开(公告)日：2020-09-08

    申请号：US16534426

    申请日：2019-08-07

    Applicant: KONICA MINOLTA, INC.

    Inventor： Katsuhide Sakai ,  Yasuhiro Koide ,  Toshiaki Tanaka ,  Akihiro Hayashi

    IPC: G03G15/00

    Abstract: An image forming apparatus forms an image on a sheet, and includes: a rotator used to form the image; a motor that drives the rotator rotationally; a current measurer that measures motor current flowing through a current-carrying path including a winding of the motor, at measurement timing that is timing after the motor starts up; a torque acquirer that acquires a torque value of the motor based on a measured value of the motor current; and a corrector that performs correction for cancellation of an amount of error based on one or both of a variation in characteristic corresponding to motor speed of the motor and a variation in characteristic corresponding to the motor current at the measurement timing, at the acquisition of the torque value by the torque acquirer.

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