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1.发明授权公开(公告)号：US11563393B2
公开(公告)日：2023-01-24
申请号：US17120592
申请日：2020-12-14
Applicant: MINEBEA MITSUMI Inc.
Inventor： Kazuo Takada , Takayuki Matsui , Haruka Miyaji , Hideo Sano
Abstract: A control device 10 for a rotary apparatus 1 includes a driving circuit 40 configured to apply a driving voltage to a stepping motor 20 that rotates an output gear 74, and a control circuit 30 configured to output, to the driving circuit 40, driving pulses in a number corresponding to a driving target included in a driving command signal from the outside. The control circuit 30 includes a driving-pulse output unit 61 configured to output the driving pulse in the number corresponding to the driving target, a position-information acquiring unit 52 configured to acquire position information from a potentiometer 75 that reads a rotating position of the output gear 74 of the rotary apparatus 1, and a rotation-abnormality determining unit 59 configured to determine, based on the position information acquired by the position-information acquiring unit 52, whether a rotation abnormality has occurred in the rotary apparatus 1.
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公开(公告)号：US10530283B2
公开(公告)日：2020-01-07
申请号：US15934281
申请日：2018-03-23
Applicant: Minebea Mitsumi Inc.
Inventor： Ayaka Shimada , Takayuki Matsui , Kazuo Takada , Haruka Miyaji , Hideo Sano
Abstract: A motor controller capable of more reliably starting a stepping motor even if a predetermined drive power is supplied to the stepping motor, and to a control method for the stepping motor is provided. The motor controller driving a stepping motor detects that the stepping motor is in a step-out state after a start operation of the stepping motor is performed. If predetermined determination conditions are satisfied, when it is detected that the stepping motor is in a step-out state, it is determined that a restart operation of the stepping motor is performed, and the stepping motor is restarted.
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公开(公告)号：US10408868B2
公开(公告)日：2019-09-10
申请号：US15912876
申请日：2018-03-06
Applicant: Minebea Mitsumi Inc.
Inventor： Shigeki Miyaji , Kazuo Takada , Kei Yamazaki
Abstract: In accordance with one aspect of the present disclosure, a motor drive control device is a motor drive control device performing PWM (Pulse Width Modulation) control of a motor, wherein harmonics of a fundamental frequency for PWM control of the motor are included in noise occurring from the motor; the fundamental frequency for PWM control is larger than a frequency corresponding to a bandwidth of a predetermined radio frequency band a communication apparatus uses; and frequencies of continuous harmonic components of the fundamental frequency for PWM control appear before and after the predetermined radio frequency band.
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公开(公告)号：US11381139B2
公开(公告)日：2022-07-05
申请号：US16282724
申请日：2019-02-22
Applicant: MINEBEA MITSUMI Inc.
Inventor： Haruka Miyaji , Kazuo Takada , Shigeki Miyaji , Takayuki Matsui
Abstract: To provide a motor inhibiting emission of electromagnetic noise (EMC) to the outside and a rotary apparatus including the motor. The rotary apparatus (10) of the present disclosure includes: a housing (20); a motor (40) arranged inside the housing (20); a circuit board (50) arranged inside the housing (20) and electrically connected to the motor (40); and a flexible wiring board (44) electrically connecting the motor (40) to the circuit board (50), the motor (40) including a frame (41a) formed with a conductive member, the frame (41a) electrically connected via the flexible wiring board (44) to a ground of the circuit board (50).
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公开(公告)号：US20190190352A1
公开(公告)日：2019-06-20
申请号：US16282724
申请日：2019-02-22
Applicant: Minebea Mitsumi Inc.
Inventor： Haruka MIYAJI , Kazuo Takada , Shigeki Miyaji , Takayuki Matsui
CPC classification number: H02K11/022 , H02K5/225 , H02K7/1166 , H02K11/40 , H02K2211/03
Abstract: To provide a motor inhibiting emission of electromagnetic noise (EMC) to the outside and a rotary apparatus including the motor. The rotary apparatus (10) of the present disclosure includes: a housing (20); a motor (40) arranged inside the housing (20); a circuit board (50) arranged inside the housing (20) and electrically connected to the motor (40); and a flexible wiring board (44) electrically connecting the motor (40) to the circuit board (50), the motor (40) including a frame (41a) formed with a conductive member, the frame (41a) electrically connected via the flexible wiring board (44) to a ground of the circuit board (50).
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Patent Agency Ranking
6.发明授权公开(公告)号：US10742147B2
公开(公告)日：2020-08-11
申请号：US16261719
申请日：2019-01-30
Applicant: MINEBEA MITSUMI Inc.
Inventor： Kazuo Takada , Takayuki Matsui
Abstract: A motor control circuit includes an input voltage measuring unit, a temperature measuring unit, a speed setting unit, and a speed control unit. The input voltage measuring unit measures an input voltage input to a motor control device. The temperature measuring unit measures the temperature. The speed setting unit sets a target value of driving speed of a stepping motor based on a measurement result of the input voltage measuring unit, a measurement result of the temperature measuring unit and based on a set value of driving speed preset for each of the plural partial areas which are sectioned in a matrix form with a threshold value related to the input voltage and a threshold value related to the temperature. The speed control unit controls the driving speed according to the target value of the driving speed set in the speed setting unit.
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公开(公告)号：US10331571B2
公开(公告)日：2019-06-25
申请号：US15671267
申请日：2017-08-08
Applicant: Minebea Mitsumi Inc.
Inventor： Kazuo Takada , Shigeki Miyaji , Yoshiaki Motoyama , Yasuyuki Hasegawa
Abstract: An address control circuit includes a setting terminal connectable to a ground potential, a time constant setting circuit connected to the setting terminal, and a control unit connected to the time constant setting circuit and configured to set an address for serial communication. The time constant setting circuit includes a resistive element disposed between the setting terminal and the control unit and configured to protect the control unit against overvoltage. The control unit outputs a voltage to the time constant setting circuit, and sets an address at a predetermined timing based on the voltage input from the time constant setting circuit when a predetermined time has passed after the output of the voltage is stopped.
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公开(公告)号：US11165377B2
公开(公告)日：2021-11-02
申请号：US16973932
申请日：2019-05-23
Applicant: MINEBEA MITSUMI Inc.
Inventor： Ayaka Shimada , Kazuo Takada , Kei Yamazaki
IPC: H02P8/30
Abstract: A control device for a stepping motor capable of hold control that can smoothly reduce an excitation current at a rotation stopping time of the stepping motor is provided. A control device (10) for a stepping motor (20) causes an excitation current to flow in a plurality of coils to rotate a rotor. The control device (10) includes a driving circuit (40) that applies a driving voltage to the coils, and a control circuit (30) that controls the driving voltage. The control circuit (30) performs hold control to move the rotor to a predetermined stop position by changing a magnitude of the excitation current flowing in the coils so that the magnitude of the excitation current becomes close to a target current value that gradually decreases, in a hold time period at a rotation stopping time of the stepping motor (20). The control circuit (30) sets an operation mode of the driving circuit (40) at an operation mode corresponding to a comparison result of the magnitude of the excitation current and the target current value, of a plurality of operation modes, at each predetermined period in the hold time period. The plurality of operation modes include a charge mode to increase the excitation current and a first attenuation mode to attenuate the excitation current.
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公开(公告)号：US11139763B2
公开(公告)日：2021-10-05
申请号：US16939473
申请日：2020-07-27
Applicant: MINEBEA MITSUMI Inc.
Inventor： Haruka Miyaji , Kei Yamazaki , Takayuki Matsui , Kazuo Takada , Shigeki Miyaji , Ayaka Shimada
Abstract: A motor drive control device has a controller and a driver. The controller generates a control signal for controlling driving of a two-phase stepping motor so as to alternately repeat one-phase excitation in which a coil of one phase in coils of two phases of the two-phase stepping motor is excited and two-phase excitation in which the coils of two phases in the coils of the two phases are excited. The driver drives the coils of the two phases, based on the control signal. The controller determines, based on a back electromotive force generated in the coil that was not excited during the one-phase excitation, a period of performing the one-phase excitation, and determines, based on the period of the one-phase excitation performed before the two-phase excitation, a period of performing the two-phase excitation.
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10.发明授权公开(公告)号：US10742146B2
公开(公告)日：2020-08-11
申请号：US16261699
申请日：2019-01-30
Applicant: MINEBEA MITSUMI Inc.
Inventor： Kazuo Takada , Hidetoshi Hijikata
Abstract: A motor control circuit includes an input voltage measuring unit, a temperature measuring unit, a current setting unit, and a current control unit. The input voltage measuring unit measures an input voltage input to the motor control device. The temperature measuring unit measures the temperature. The current setting unit sets a target value of drive current to flow through a coil of a stepping motor based on a measurement result of the input voltage measuring unit and a measurement result of the temperature measuring unit and based on a set value of drive current preset for each of plural partial areas, which are sectioned in a matrix form with a threshold value related to the input voltage and a threshold value related to the temperature. The current control unit controls the drive current according to the target value of the drive current set in the current setting unit.
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