Motor controller, conveyor, image forming apparatus, and motor control method

    公开(公告)号:US10734932B2

    公开(公告)日:2020-08-04

    申请号:US16381076

    申请日:2019-04-11

    摘要: A motor controller that controls a motor in which a rotor using a permanent magnet is rotated by a rotating magnetic field due to a current flowing through a winding: performs hold control that continuously causes a fixed excitation current to flow through the winding to cause a fixed magnetic field for suppressing rotation of the rotor to be generated in a suspension period in which the motor is stopped; performs hold enhancement control that enhances the fixed magnetic field with input of a timing signal defined in advance as a trigger, in the suspension period; and starts rotational excitation control that generates the rotating magnetic field when a rotation start timing arrives.

    Rotation detector and image forming apparatus

    公开(公告)号:US11990856B2

    公开(公告)日:2024-05-21

    申请号:US17854777

    申请日:2022-06-30

    IPC分类号: H02P21/18 H02P6/16 H02P21/22

    CPC分类号: H02P6/16 H02P21/22

    摘要: A rotation detector includes a motor, a current detector and a hardware processor. The motor includes coils of two or more phases and a rotor. The current detector detects currents flowing in coils of at least two phases among the coils of two or more phases. The hardware processor estimates an initial position of the rotor based on current values of the currents detected by the current detector to start the motor, controls an energization pattern on the phases to rotate and start the motor based on the estimated initial position, and determines whether the rotor stops or is rotating before completing the estimation of the initial position.

    MOTOR CONTROLLER, CONVEYOR, IMAGE FORMING APPARATUS, AND MOTOR CONTROL METHOD

    公开(公告)号:US20190341866A1

    公开(公告)日:2019-11-07

    申请号:US16381076

    申请日:2019-04-11

    摘要: A motor controller that controls a motor in which a rotor using a permanent magnet is rotated by a rotating magnetic field due to a current flowing through a winding: performs hold control that continuously causes a fixed excitation current to flow through the winding to cause a fixed magnetic field for suppressing rotation of the rotor to be generated in a suspension period in which the motor is stopped; performs hold enhancement control that enhances the fixed magnetic field with input of a timing signal defined in advance as a trigger, in the suspension period; and starts rotational excitation control that generates the rotating magnetic field when a rotation start timing arrives.

    Motor controller and image forming apparatus

    公开(公告)号:US20190068099A1

    公开(公告)日:2019-02-28

    申请号:US16108277

    申请日:2018-08-22

    IPC分类号: H02P21/32 H02P21/18 G03G15/00

    摘要: A motor controller for controlling a brushless DC motor is provided. The motor controller includes a vector control unit configured to perform a sensorless vector control on the brushless DC motor in accordance with an input command value; a storage portion configured to store time-series control target values so that an amount of rotation angle of the brushless DC motor transitions in a same manner as an expected pattern; and a command portion configured to input, to the vector control unit, the control target values serially as the command value.