公开(公告)号：US20230387839A1

公开(公告)日：2023-11-30

申请号：US18303068

申请日：2023-04-19

Applicant: ALPS ALPINE CO., LTD.

Inventor： Ryo MAEDA ,  Ikuyasu MIYAKO ,  Wataru KIMURA

IPC: H02P6/18 ,  H02P21/18

CPC classification number: H02P6/188 ,  H02P21/18

Abstract: A rotation angle detecting method includes measuring a current flowing through a motor, and obtaining a rotation angle of the motor based on a value of the measured current. The obtaining of the rotation angle of the motor includes obtaining the rotation angle in an inertial rotation of the motor based on a rotational angular velocity of the motor immediately before a first time point, a time period from the first time point to a second time point, and a time period from the second time point to a third time point. The first time point is a time point at which driving of the motor is stopped, the second time point is a time point at which a polarity of the value of the measured current is inverted, and the third time point is a time point at which the value of the measured current becomes zero.

公开(公告)号：US20230280151A1

公开(公告)日：2023-09-07

申请号：US18158752

申请日：2023-01-24

Applicant: ALPS ALPINE CO., LTD.

Inventor： Ikuyasu MIYAKO ,  Wataru KIMURA ,  Ryo MAEDA

IPC: G01B7/30 ,  G01D5/244

CPC classification number: G01B7/30 ,  G01D5/24471

Abstract: A rotation angle detection device includes a current meter that measures a current flowing in a direct current motor; a filter that extracts a ripple component from the current; a ripple detector that detects a ripple from a signal that has passed through the filter; and a rotation angle detector that detects a rotation angle of the direct current motor based on the number of ripples. The rotation angle detector measures an observation period based on consecutive ripples, calculates an estimation period between the consecutive ripples based on the observation period, determines whether the observation period is within a normal range based on the estimation period and the observation period, and in response to determining that the observation period is within the normal range and an immediately-previous observation period is outside the normal range, calculates a number of correction ripples CRN so as to correct the number of the ripples.

公开(公告)号：US20200379500A1

公开(公告)日：2020-12-03

申请号：US16994719

申请日：2020-08-17

Applicant: Alps Alpine Co., Ltd.

Inventor： Takashi UENOMACHI ,  Toshio OGAWA ,  Shinya MUTO ,  Yoshitsugu WAKITA ,  Ikuyasu MIYAKO ,  Wataru KIMURA

IPC: G05G5/03 ,  G05G1/08 ,  F16H1/20

Abstract: An input device includes a base member, a motor, a rotation shaft, a worm gear, a first gear, a rotor, a movement member, an elastic member, a change amount detection unit, and a controller. The rotation shaft is rotated by the motor. The worm gear is rotated by the rotation shaft. The first gear is rotatable and engaged with the worm gear. The rotor is rotatable relative to the base member, includes a second gear engaged with the first gear, and is rotated by an operator. The movement member is moved as the worm gear is moved. The elastic member generates urging force. The change amount detection unit detects a change amount of a state that is changed in accordance with the movement of the movement member. The controller performs drive control for the motor to change a sense of force applied to the operator.

公开(公告)号：US20200376963A1

公开(公告)日：2020-12-03

申请号：US16994769

申请日：2020-08-17

Applicant: Alps Alpine Co., Ltd.

Inventor： Takashi UENOMACHI ,  Toshio OGAWA ,  Shinya MUTO ,  Yoshitsugu WAKITA ,  Ikuyasu MIYAKO ,  Wataru KIMURA

IPC: B60K37/06 ,  G05G1/10

Abstract: An input device includes a base member, a motor, a rotation shaft, a worm gear, a first gear, a second gear, an elastic member, a rotor, an angle detection unit, and a controller. The rotation shaft is rotated by the motor. The worm gear is unitarily rotated with the rotation shaft. The first gear is rotatable and engaged with the worm gear. The second gear is coaxial with the first gear. The elastic member generates urging force. The rotor is rotatable relative to the base member, includes a third gear engaged with the second gear, and is rotated by an operator. The angle detection unit detects a first rotation angle of the first gear and a second rotation angle of the second gear. The controller performs drive control for the motor to change a sense of force applied to the operator.