公开(公告)号：US11990856B2

公开(公告)日：2024-05-21

申请号：US17854777

申请日：2022-06-30

Applicant: Konica Minolta, Inc.

Inventor： Yuta Tachibana ,  Hiroyuki Yoshikawa ,  Kazumichi Yoshida ,  Satoshi Miyajima ,  Kouei Cho

IPC: H02P21/18 ,  H02P6/16 ,  H02P21/22

CPC classification number: H02P6/16 ,  H02P21/22

Abstract: 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.

公开(公告)号：US11152879B2

公开(公告)日：2021-10-19

申请号：US16785959

申请日：2020-02-10

Applicant: KONICA MINOLTA, INC.

Inventor： Yuta Tachibana ,  Hiroyuki Yoshikawa ,  Daichi Suzuki

IPC: H02P21/00 ,  H02P21/18 ,  H02P21/22 ,  G03G15/00 ,  H02P27/12

Abstract: In a motor control device, when estimating an initial position of a magnetic pole of a rotor of a motor, a drive circuit continuously or intermittently applies a voltage to a stator winding at each of a plurality of energization angles while sequentially changing the energization angles, and at a voltage value and for an energization time period, the voltage value and the energization time period being set such that the rotor does not rotate. An initial position estimation unit calculates an estimated initial position of the magnetic pole of the rotor based on a phase angle of a trigonometric function curve that approximates a change of a γ-axis current Iγ with respect to each of the energization angles. The trigonometric function curve has a cycle equal to one electrical cycle of the motor.

公开(公告)号：US11223309B2

公开(公告)日：2022-01-11

申请号：US16794043

申请日：2020-02-18

Applicant: KONICA MINOLTA, INC.

Inventor： Hiroyuki Yoshikawa ,  Yuta Tachibana ,  Yuji Kobayashi ,  Kazumichi Yoshida ,  Daichi Suzuki ,  Harumitsu Fujimori

IPC: H02P21/18 ,  H02P21/22 ,  H02P27/12 ,  G03G15/00 ,  H02P21/34

Abstract: 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.

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.

公开(公告)号：US10081508B2

公开(公告)日：2018-09-25

申请号：US14337416

申请日：2014-07-22

Applicant: KONICA MINOLTA, INC.

Inventor： Takaki Kato ,  Yuji Kobayashi ,  Yuta Tachibana ,  Hiroshi Yamaguchi ,  Satoshi Teshima

IPC: B65H7/14 ,  B65H3/06

CPC classification number: B65H7/14 ,  B65H3/0607 ,  B65H2511/22 ,  B65H2513/514 ,  B65H2553/414 ,  B65H2553/44 ,  B65H2701/1311 ,  B65H2701/1313 ,  B65H2801/06 ,  B65H2220/01 ,  B65H2220/03 ,  B65H2220/02

Abstract: A sheet feeder picking up and transporting sheets includes a transport unit transporting sheets along a sheet transport path one by one, a gap occurrence detection unit detecting, within a predetermined section of the sheet transport path, occurrence of a gap between sheets, and a controller controlling a timing of the transport of sheets according to a result of the detection. The gap occurrence detection unit includes a first detection unit and a second detection unit. The first detection unit is configured to detect light that is emitted toward the predetermined section, reaches a converging surface thereof across the predetermined section, and converged on a receiving element thereof. The second detection unit is configured to detect light reflected by a sheet passing through the predetermined section. The occurrence of the gap is detected based on outputs from the first detection unit and the second detection unit.

公开(公告)号：US11233471B2

公开(公告)日：2022-01-25

申请号：US16737093

申请日：2020-01-08

Applicant: KONICA MINOLTA, INC.

Inventor： Daichi Suzuki ,  Yuji Kobayashi ,  Kazumichi Yoshida ,  Harumitsu Fujimori ,  Yuta Tachibana ,  Hiroyuki Yoshikawa

IPC: H02P6/185 ,  H02P21/18 ,  G03G15/00 ,  H02P6/15 ,  H02P6/06 ,  H02P6/08 ,  H02P6/22 ,  H02P6/28 ,  H02P27/08 ,  H02P6/17

Abstract: 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.

公开(公告)号：US20190372490A1

公开(公告)日：2019-12-05

申请号：US16401416

申请日：2019-05-02

Applicant: KONICA MINOLTA, INC.

Inventor： Hiroyuki Yoshikawa ,  Daichi Suzuki ,  Yuta Tachibana

IPC: H02P6/185 ,  H02K1/27 ,  H02P25/089 ,  H02K11/22

Abstract: A control device of a permanent magnet synchronous motor that is a control device of a sensorless-type permanent magnet synchronous motor in which a rotor using a permanent magnet rotates by a rotating magnetic field caused by a current flowing in an armature includes: a driver that applies a voltage to the armature and drives the rotor; an initial position estimator that estimates an initial position which is a magnetic pole position of the rotor that is stopped; and a controller that controls the driver so as to apply a pulse train including a voltage pulse for searching the initial position for each of n angle positions dividing a search range of an electrical angle of 360 degrees to the armature, wherein the pulse train includes a first pulse and a second pulse.

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.

公开(公告)号：US08899581B2

公开(公告)日：2014-12-02

申请号：US14159529

申请日：2014-01-21

Applicant: Konica Minolta, Inc.

Inventor： Hiroshi Yamaguchi ,  Takaki Kato ,  Yuta Tachibana ,  Yuji Kobayashi ,  Satoshi Teshima

IPC: B65H5/34 ,  G03G15/16 ,  B65H5/06 ,  B65H29/68

CPC classification number: G03G15/167 ,  B65H5/06 ,  B65H7/20 ,  B65H9/006 ,  B65H9/14 ,  B65H29/68 ,  B65H2404/14 ,  B65H2511/514 ,  B65H2513/222 ,  B65H2513/512 ,  B65H2557/242 ,  B65H2701/1311 ,  B65H2801/06 ,  G03G15/602 ,  G03G15/6561 ,  H04N1/00588 ,  H04N1/00602 ,  H04N1/00652 ,  H04N2201/0082 ,  B65H2220/02 ,  B65H2220/01

Abstract: An image processing apparatus includes: a transport roller for transporting a sheet subjected to image processing; a motor that drives the transport roller to rotate; and a speed reduction unit that performs a speed reduction control on the motor to temporarily stop the sheet, the speed reduction control being performed in a manner that a stopping time and a stopping distance each satisfy a corresponding target range, wherein the speed reduction control includes: a first control that is a control of reducing a rotation speed of the motor to a reference speed through at least two operations from among a braking operation, a powering operation, and a free running operation; and a second control that is a control of, after a rotation amount of the motor from the start of the speed reduction control reaches a reference value, continuously performing the braking operation until the stop of the motor.

Abstract translation: 一种图像处理设备包括：用于传送经过图像处理的片材的传送辊; 驱动输送辊旋转的马达; 以及减速单元，其对所述电动机进行减速控制以暂时停止所述纸张，所述减速控制以停止时间和停止距离各自满足相应的目标范围的方式进行，其中所述减速控制包括 ：第一控制装置，其是通过制动操作，动力操作和自由行驶操作中的至少两个操作来将马达的转速降低到基准速度的控制; 以及作为控制的第二控制，在从减速控制开始开始的电动机的旋转量达到基准值之后，持续进行制动操作直到电动机的停止。

公开(公告)号：US12210306B2

公开(公告)日：2025-01-28

申请号：US18134262

申请日：2023-04-13

Applicant: KONICA MINOLTA, INC.

Inventor： Yuhei Tatsumoto ,  Akimasa Ishikawa ,  Makoto Shimazoe ,  Yuta Tachibana ,  Kouei Cho

IPC: G03G15/00 ,  G06K15/00

Abstract: Provided is an image forming system capable of accurately detecting the resistance of a recording material. The image forming system includes an application roller that applies a voltage to a recording material on a conveyance path, and a controller that calculates the electric resistance of the recording material from a relationship between the voltage applied to the application roller and a current. The controller calculates the resistance of the recording material based on first profile information that is acquired by changing the applied voltage and corresponds to a change in the resistance of the application roller, and second profile information that is acquired by changing the applied voltage in a state where the recording material is sandwiched and corresponds to the change in the resistance of the application roller.