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1. 发明授权

US11637518B2 Motor drive control device and motor drive control method 有权
公开(公告)号：US11637518B2
公开(公告)日：2023-04-25
申请号：US17477690
申请日：2021-09-17
申请人： MINEBEA MITSUMI Inc.
发明人： Hiroki Kokubo , Shinji Totsuka , Shigemi Masuda
IPC分类号： H02P21/18 , H02P21/24 , H02P23/12 , H02P6/18 , H02P21/34
摘要： A motor drive control device includes a drive circuit configured to drive a motor with a drive control signal for driving the motor, and a control circuit configured to perform a vector control arithmetic operation based on a detection result of drive currents of coils of the motor, to generate the drive control signal and supply the drive control signal to the drive circuit. When generating the drive control signal, the control circuit estimates a rotation angle of a rotor of the motor and a rotation speed of the rotor with a q-axis current value of a two-phase rotating coordinate system calculated with a detection result of the drive current, and a q-axis voltage command value of the two-phase rotating coordinate system, by using a linear Kalman filter including a prediction step and an update step, using a stationary Kalman filter with the prediction step expressed linearly and time-invariantly.

2. 发明申请

US20230114489A1 VIBRATOR GENERATOR HAVING SWING UNIT, FRAME AND ELASTIC MEMBER 有权
公开(公告)号：US20230114489A1
公开(公告)日：2023-04-13
申请号：US18065691
申请日：2022-12-14
申请人： MINEBEA MITSUMI Inc.
发明人： Manabu NAKAMURA
IPC分类号： H02K33/00 , H02K33/16
摘要： A vibrator includes a frame, a swing unit, and an elastic member. The swing unit is disposed within the frame and holds a magnet. The elastic member connects the swing unit and the frame. The swing unit is movable with respect to the frame while deforming the elastic member. The frame, the swing unit, and the elastic member are integrally molded with each other.

3. 发明申请

US20230111291A1 MOTOR CONTROLLER, MOTOR SYSTEM AND METHOD FOR CONTROLLING MOTOR 有权
公开(公告)号：US20230111291A1
公开(公告)日：2023-04-13
申请号：US17907299
申请日：2021-03-18
申请人： MINEBEA MITSUMI Inc.
发明人： Toshiki KIMURA
IPC分类号： H02P27/08 , H02P23/14
摘要： A method for energizing a motor with a rotor by turning on a different portion of all arms, for each energization pattern, among the arms of an inverter, is provided. The method includes generating a PWM signal, for each phase, with a duty cycle of a same value, the PWM signal having a first period length that is defined by a first period during which a portion of the arms is turned on with a first energization pattern, during an idle time of the rotor; a second period during which a portion of the arms is turned on with a second energization pattern, during the idle time; and a third period during which all upper arms or all lower arms, among the arms, are turned on with a third energization pattern, during the idle time. The method includes subtracting, from a first current magnitude or a second current magnitude, a magnitude that is half of a sum of the first current magnitude for a first phase flowing through a current detection unit, which is coupled to a DC side of the inverter, during the first period, and the second current magnitude for the first phase flowing through the current detection unit during the second period, thereby calculating an offset current magnitude for the first phase during the idle time.

4. 发明申请

US20230071255A1 ABSOLUTE ENCODER 有权
公开(公告)号：US20230071255A1
公开(公告)日：2023-03-09
申请号：US17759744
申请日：2021-01-27
申请人： MINEBEA MITSUMI Inc.
发明人： Takeshi SAKIEDA , Katsunori SAITO , Yujin ISHI
IPC分类号： G01B7/30 , G01D5/14 , G01D5/16
摘要： The influence of a leakage magnetic flux from a magnet on a magnetic sensor configured to detect a magnetic flux from the permanent magnet is reduced. An absolute encoder includes a first magnet provided at a leading end side of a first worm gear part, a first angle sensor configured to detect a rotation angle of the first worm gear part corresponding to a change in a magnetic flux generated from the first magnet, a second magnet provided at a leading end side of a second worm wheel part, a second angle sensor configured to detect a rotation angle of the second worm wheel part corresponding to a change in a magnetic flux generated from the second magnet, and a gear base part configured to surround at least a part of a periphery of the first angle sensor and the second angle sensor.

5. 发明申请

US20230042658A1 MOTOR 有权
公开(公告)号：US20230042658A1
公开(公告)日：2023-02-09
申请号：US17759112
申请日：2021-02-04
申请人： MINEBEA MITSUMI Inc.
发明人： Hirofumi OHBA , Kodai KAMEOKA
IPC分类号： H02K1/16 , H02K15/02 , H02K15/085
摘要： A motor capable of increasing cogging torque is provided. A motor includes a shaft; a magnetic member including a core including an annular portion and a plurality of spokes and a coil; and a magnet, wherein one of the magnetic member and the magnet is disposed at an inner side of the other; an end portion of each of the spokes and the magnet oppose one another in radial directions nm; the core includes a pair of magnetic pole portions at the end portion of each of the spokes, the a pair of magnetic pole portions extending in both directions of circumferential directions xy; and of the pair of magnetic pole portions of at least one spoke from among the plurality of spokes, the magnetic pole portion at an x side has a larger magnetic resistance than the magnetic pole portion at a y side.

6. 发明授权

US11563393B2 Control device for rotary apparatus, rotary apparatus, and control method for rotary apparatus 有权
公开(公告)号：US11563393B2
公开(公告)日：2023-01-24
申请号：US17120592
申请日：2020-12-14
申请人： MINEBEA MITSUMI Inc.
发明人： Kazuo Takada , Takayuki Matsui , Haruka Miyaji , Hideo Sano
IPC分类号： H02P8/00 , H02P8/34 , H02K37/24 , H02K11/21 , H02K7/116
摘要： 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.

7. 发明授权

US11552542B2 Vibrator generator having swing unit, frame and elastic member 有权
公开(公告)号：US11552542B2
公开(公告)日：2023-01-10
申请号：US17515907
申请日：2021-11-01
申请人： MINEBEA MITSUMI INC.
发明人： Manabu Nakamura
IPC分类号： H02K33/00 , H02K33/16 , H02K5/24 , B06B1/04 , H02K5/04 , H02K33/02 , G04C3/10 , H02K33/06 , H02K5/124
摘要： A vibrator includes a frame, a swing unit, and an elastic member. The swing unit is disposed within the frame and holds a magnet. The elastic member connects the swing unit and the frame. The swing unit is movable with respect to the frame while deforming the elastic member. The frame, the swing unit, and the elastic member are integrally molded with each other.

8. 发明授权

US11552522B2 Rotor with a bearing 有权
公开(公告)号：US11552522B2
公开(公告)日：2023-01-10
申请号：US17060747
申请日：2020-10-01
申请人： MINEBEA MITSUMI Inc.
发明人： Uwe Schäfer , Helmut Schneider , Felix Blaser
IPC分类号： H02K5/16 , H02K5/167 , H02K7/08
摘要： A rotor for an electric motor, comprising a rotor magnet and a bearing for the rotatable support on a fixed axle, the bearing comprising first and second bearing half-shells, wherein at least the first bearing half-shell is moveably arranged within the rotor body with respect to the second bearing half-shell, and wherein the first bearing half-shell is supported against the rotor body by a resilient element tangentially arranged with respect to the axle. The resilient element, at both its side surfaces facing in an axial direction of the axle, has at least one respective first protrusion extending in the axial direction, and the first bearing half-shell, on a side facing away from its bearing surface, includes at least two axially spaced second protrusions each extending in a radial direction and cooperating with the first protrusions for aligning the resilient element.

9. 发明申请

US20230006524A1 VIBRATION GENERATING DEVICE AND ELECTRONIC DEVICE 有权
公开(公告)号：US20230006524A1
公开(公告)日：2023-01-05
申请号：US17931163
申请日：2022-09-12
申请人： MINEBEA MITSUMI INC.
发明人： Mikio UMEHARA , Yutaka KAMOGI
IPC分类号： H02K33/02 , H01F7/20
摘要： In accordance with one aspect of the present disclosure, a vibration generating device includes a protruding part; a base provided with the protruding part and formed of a magnetic body; an annular coil surrounding the protruding part; a plate facing the base and formed of a magnetic body; and an elastic member supporting the plate with respect to the base. The plate and the base constitute magnetic circuit.

10. 发明授权

US11499876B2 Strain gauge and sensor module 有权
公开(公告)号：US11499876B2
公开(公告)日：2022-11-15
申请号：US16757869
申请日：2018-10-25
申请人： MINEBEA MITSUMI Inc.
发明人： Satoshi Sato , Shigeyuki Adachi , Eiji Misaizu , Atsushi Kitamura , Toshiaki Asakawa , Hirotsugu Iijima , Yoichi Kimura
IPC分类号： G01L1/22 , G01L5/00 , H01C7/00 , H05K1/16 , H05K1/02 , H05K1/03
摘要： The present strain gauge includes a substrate having flexibility; a resistor formed from a material containing at least one of chromium and nickel, on the substrate; a pair of wiring patterns formed on the substrate and electrically connected to both ends of the resistor; and a pair of electrodes formed on the substrate and electrically connected to the pair of wiring patterns, respectively. The wiring patterns include a first layer extending from the resistor, and a second layer having a lower resistance than the first layer and layered on the first layer. On the substrate, an electronic component mounting area is demarcated, on which an electronic component electrically connected to the electrodes is mounted.

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