公开(公告)号：US10224859B2

公开(公告)日：2019-03-05

申请号：US15925386

申请日：2018-03-19

Applicant: RICOH COMPANY, LTD.

Inventor： Hiroyuki Kiguchi ,  Takeo Seki ,  Natsuko Ishizuka ,  Takuya Murata

IPC: B65H9/00 ,  H02P29/024 ,  H02P3/00

Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.

公开(公告)号：US09973133B2

公开(公告)日：2018-05-15

申请号：US15272077

申请日：2016-09-21

Applicant: Ricoh Company, Ltd.

Inventor： Hiroyuki Kiguchi ,  Takeo Seki ,  Natsuko Ishizuka ,  Takuya Murata

IPC: G05B19/29 ,  H02P29/024 ,  H02P3/00

CPC classification number: H02P29/024 ,  G05B2219/34013 ,  H02P3/00 ,  H02P29/0241

Abstract: A motor control device includes a detecting unit configured to detect rotation of a motor to be controlled and output a rotation detection value related to the rotation; a drive control unit configured to perform drive control to rotate the motor at a control target value increasing with time based on the rotation detection value; and an abnormality detection unit configured to perform an abnormality detection process for detecting an abnormality in the drive control based on the rotation detection value and a predetermined threshold. The drive control unit performs control to stop rotation of the motor when the abnormality is detected.

公开(公告)号：US09367046B2

公开(公告)日：2016-06-14

申请号：US14706423

申请日：2015-05-07

Applicant: RICOH COMPANY, LTD.

Inventor： Takuya Murata ,  Natsuko Ishizuka

IPC: G03G15/00 ,  G03G21/00 ,  B41J29/38 ,  G05B6/02

CPC classification number: G05B6/02 ,  G03G15/6529 ,  G05B19/042 ,  G05B2219/2646 ,  H02P6/00 ,  H02P6/30

Abstract: A motor controller, operatively connected to a motor having an output shaft, includes a rotary detector to detect a rotation direction and a rotation amount of the output shaft of the motor to generate an actual rotary signal, a drive controller to generate a control signal based on the actual rotary signal and a target rotary signal indicating a target rotary direction and a target rotary amount, and a driver to supply a driving power to the motor based on the control signal. When the motor is in a hold state, the control signal is reversed periodically for a predetermined reverse time period T2 per a predetermined one reverse cycle T1. When the control signal is not reversed for a certain lock detection time period Tr that is longer than the revere cycle T1 of the control signal, supply of the driving power to the motor is blocked.