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1.发明申请公开(公告)号：US20200295688A1
公开(公告)日：2020-09-17
申请号：US16794043
申请日：2020-02-18
申请人： KONICA MINOLTA, INC.
发明人： Hiroyuki YOSHIKAWA , Yuta TACHIBANA , Yuji KOBAYASHI , Kazumichi YOSHIDA , Daichi SUZUKI , Harumitsu FUJIMORI
摘要： In a motor control device that controls a sensorless-type motor, a controller estimates an initial magnetic pole position of a rotor of a motor by an inductive sensing scheme while sequentially setting a plurality of energization angles. At each of the set energization angles, the controller converts peak values of currents flowing through a plurality of phases of a stator winding into a first current component having an electrical angle that is equal to a corresponding one of the set energization angles and a second current component that is different in electrical angle by 90 degrees from the first current component, to correct the first current component based on the second current component. The controller estimates the initial magnetic pole position of the rotor based on the corrected first current component that is obtained at each of the set energization angles.
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公开(公告)号：US20230008381A1
公开(公告)日：2023-01-12
申请号：US17854777
申请日：2022-06-30
申请人： Konica Minolta, Inc.
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.
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3.发明申请公开(公告)号：US20200295689A1
公开(公告)日：2020-09-17
申请号：US16815588
申请日：2020-03-11
申请人： Konica Minolta, Inc.
发明人： Yuta TACHIBANA , Hiroyuki YOSHIKAWA , Yuji KOBAYASHI , Kazumichi YOSHIDA , Daichi SUZUKI , Harumitsu FUJIMORI
摘要： In a motor control device in one embodiment, an initial position estimation unit estimates an initial position of a magnetic pole of a rotor of a motor in an inductive sensing scheme. At each of energization angles, the initial position estimation unit multiplies a γ-axis current component Iγ corresponding to a peak value of a current flowing through a stator winding by each of a cosine value and a sine value of a correction angle obtained by correcting each of the energization angles. The initial position estimation unit estimates the initial position of the magnetic pole of the rotor based on a ratio between an integrated value of a multiplication result about the cosine value and an integrated value of a multiplication result about the sine value.
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公开(公告)号：US20240036503A1
公开(公告)日：2024-02-01
申请号：US18220300
申请日：2023-07-11
申请人： KONICA MINOLTA, INC.
IPC分类号： G03G15/00
CPC分类号： G03G15/5029 , G03G2215/00738
摘要： [Problem] To provide a stiffness measuring device capable of highly accurately measuring the stiffness of a recording material such as a sheet, and an image forming system equipped with the stiffness measuring device.
[Solution] A stiffness measuring device includes a holding portion that holds a recording material so that a recording surface of the recording material is substantially parallel to a vertical direction, a pressing portion, and a stiffness acquiring section. The pressing portion presses a measurement point located on a lower side in the vertical direction than the portion of the recording material held by the holding portion. The stiffness acquiring section measure a reaction force obtained when the measurement point is pressed by the pressing portion and acquires the measured reaction force as the stiffness of the recording material.-
5.发明申请公开(公告)号：US20200235683A1
公开(公告)日：2020-07-23
申请号：US16737093
申请日：2020-01-08
申请人： KONICA MINOLTA, INC.
发明人： Daichi SUZUKI , Yuji KOBAYASHI , Kazumichi YOSHIDA , Harumitsu FUJIMORI , Yuta TACHIBANA , Hiroyuki YOSHIKAWA
IPC分类号： H02P6/185 , G03G15/00 , H02P6/15 , H02P6/06 , H02P6/08 , H02P6/17 , H02P6/22 , H02P6/28 , H02P21/18 , H02P27/08
摘要： A control circuit of a motor control device estimates an initial magnetic pole position of a rotor using an inductive sensing scheme. When estimating the initial magnetic pole position, a drive circuit applies a voltage to a stator winding at each of L electrical angles (L≥5) while changing the L electrical angles. An absolute value of an electrical angle difference of the voltage applied to the stator winding between an i-th time (2≤i≤L) and an i−1st time is 180−360/L degrees or more and 180+360/L degrees or less. An absolute value of an electrical angle difference of the voltage applied to the stator winding between a 1st time for initial position estimation and a last time before starting initial position estimation is 180−360/L degrees or more and 180+360/L degrees or less.
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6.发明申请公开(公告)号：US20180076750A1
公开(公告)日：2018-03-15
申请号：US15682652
申请日：2017-08-22
申请人： KONICA MINOLTA, INC.
IPC分类号： H02P21/18
CPC分类号： H02P21/18 , H02P21/0021 , H02P2203/11 , H02P2207/05
摘要： A controller for a permanent magnet synchronous motor having a rotor using a permanent magnet includes a drive portion configured to apply a current to a winding to drive the rotor; an estimating portion configured to estimate a position of magnetic pole of the rotor; and a control unit configured to control the drive portion to cause the rotating magnetic field based on the estimated position of magnetic pole and to control the drive portion to stop the rotor in response to a stop command inputted. The control unit controls, as the control to stop the rotor, the drive portion to determine a current for generating a magnetic field vector which draws the position of magnetic pole of the rotor to a stop position to stop the rotor based on a latest estimated position of magnetic pole, and to keep applying the current determined to the winding.
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