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公开(公告)号：US20240079976A1
公开(公告)日：2024-03-07
申请号：US18506042
申请日：2023-11-09
发明人： Yohei Ohashi
摘要： An image forming apparatus includes a photosensitive member, an intermediate transfer member, a moving member, a driving motor, a stepper motor, a detector, a phase determiner, and a controller. The stepper motor drives the moving member to move between a first position at which the photosensitive member contacts the intermediate transfer member and a second position at which the photosensitive member contacts the intermediate transfer member are separated. The controller includes a first control mode to control a motor based on a predetermined current magnitude and a second control mode to control a motor by vector control. The controller starts driving the driving motor in the first control mode, and then switches from the first control mode to the second control mode. The controller controls the stepper motor in the first control mode during a period from when the stepper motor is activated to when the stepper motor is stopped.
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公开(公告)号：US11843341B2
公开(公告)日：2023-12-12
申请号：US17533935
申请日：2021-11-23
发明人： Yohei Ohashi
摘要： An image forming apparatus includes a photosensitive member, an intermediate transfer member, a moving member, a driving motor, a stepper motor, a detector, a phase determiner, and a controller. The stepper motor drives the moving member to move between a first position at which the photosensitive member contacts the intermediate transfer member and a second position at which the photosensitive member contacts the intermediate transfer member are separated. The controller includes a first control mode to control a motor based on a predetermined current magnitude and a second control mode to control a motor by vector control. The controller starts driving the driving motor in the first control mode, and then switches from the first control mode to the second control mode. The controller controls the stepper motor in the first control mode during a period from when the stepper motor is activated to when the stepper motor is stopped.
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公开(公告)号：US11451177B2
公开(公告)日：2022-09-20
申请号：US17064433
申请日：2020-10-06
发明人： Yohei Ohashi
摘要： An image forming apparatus includes a power source, a motor, a motor control device, a first switching element, a controller, a detector, a discriminator, and a first setting unit configured to set a control value. The motor control device includes a phase determiner configured to determine a rotational phase by using the control value, and a second setting unit. The motor control device includes a first mode and a second mode. The discriminator discriminates a type of the motor in the first mode. The motor control device executes the first mode if the controller controls the first switching element in response to supplying of the power. The motor control device does not execute the first mode even if the power is supplied to a driving circuit, when the controller controls the first switching element in response to inputting of a trigger signal.
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公开(公告)号：US20220173674A1
公开(公告)日：2022-06-02
申请号：US17533935
申请日：2021-11-23
发明人： Yohei Ohashi
摘要： An image forming apparatus includes a photosensitive member, an intermediate transfer member, a moving member, a driving motor, a stepper motor, a detector, a phase determiner, and a controller. The stepper motor drives the moving member to move between a first position at which the photosensitive member contacts the intermediate transfer member and a second position at which the photosensitive member contacts the intermediate transfer member are separated. The controller includes a first control mode to control a motor based on a predetermined current magnitude and a second control mode to control a motor by vector control. The controller starts driving the driving motor in the first control mode, and then switches from the first control mode to the second control mode. The controller controls the stepper motor in the first control mode during a period from when the stepper motor is activated to when the stepper motor is stopped.
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公开(公告)号：US20210013817A1
公开(公告)日：2021-01-14
申请号：US16914697
申请日：2020-06-29
发明人： Yohei Ohashi
摘要： A motor control apparatus operable to control a motor includes a phase determiner for determining a rotational phase of a rotor of the motor, and a controller having a first control mode for controlling a driving current flowing through a winding of the motor based on a current of a predetermined magnitude, and a second control mode for controlling a driving current flowing through the winding so that a deviation between a command phase representing a target phase of the rotor and a rotational phase determined by the phase determiner is reduced. The controller executes the first control mode without executing the second control mode in a case of rotating the motor in a first direction, and executes the second control mode in a case of rotating the motor in a second direction which is a reverse direction to the first direction.
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公开(公告)号：US20190386596A1
公开(公告)日：2019-12-19
申请号：US16431859
申请日：2019-06-05
发明人： Yohei Ohashi
摘要： When field strengthening is constantly performed during driving by a drive motor to inhibit a rotating speed of the drive motor from suddenly fluctuating, power consumption is increased. The field strengthening is performed only during a period during which the field strengthening is required to be performed. Thus, it is possible to reduce a period during which a current value is set to a d-axis current command value (the field strengthening is performed) while the motor is driven. This can prevent increased power consumption.
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公开(公告)号：US11349417B2
公开(公告)日：2022-05-31
申请号：US16914697
申请日：2020-06-29
发明人： Yohei Ohashi
摘要： A motor control apparatus operable to control a motor includes a phase determiner for determining a rotational phase of a rotor of the motor, and a controller having a first control mode for controlling a driving current flowing through a winding of the motor based on a current of a predetermined magnitude, and a second control mode for controlling a driving current flowing through the winding so that a deviation between a command phase representing a target phase of the rotor and a rotational phase determined by the phase determiner is reduced. The controller executes the first control mode without executing the second control mode in a case of rotating the motor in a first direction, and executes the second control mode in a case of rotating the motor in a second direction which is a reverse direction to the first direction.
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公开(公告)号：US20210135615A1
公开(公告)日：2021-05-06
申请号：US17064433
申请日：2020-10-06
发明人： Yohei Ohashi
摘要： An image forming apparatus includes a power source, a motor, a motor control device, a first switching element, a controller, a detector, a discriminator, and a first setting unit configured to set a control value. The motor control device includes a phase determiner configured to determine a rotational phase by using the control value, and a second setting unit. The motor control device includes a first mode and a second mode. The discriminator discriminates a type of the motor in the first mode. The motor control device executes the first mode if the controller controls the first switching element in response to supplying of the power. The motor control device does not execute the first mode even if the power is supplied to a driving circuit, when the controller controls the first switching element in response to inputting of a trigger signal.
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