-
公开(公告)号：US12273055B2
公开(公告)日：2025-04-08
申请号：US18035295
申请日：2022-03-31
Applicant: MITSUBA Corporation
Inventor： Ryo Ohori , Tsuyoshi Osawa , Atsushi Mochida
Abstract: The invention reduces the stoppage of operation due to a sudden decrease in rotation speed. A motor device includes a motor that is rotationally driven; a drive signal generator that controls a duty ratio indicating a drive output of the motor so as not to exceed a duty ratio upper limit value, and generates a drive signal corresponding to the duty ratio; an inverter that outputs an output signal for rotationally driving the motor based on the drive signal; a rotation speed detector that detects a rotation speed of the motor; an acceleration detector that detects whether the motor is accelerating; and an upper limit value setting part that changes the duty ratio upper limit value to a second upper limit value higher than a preset first upper limit value in response to rotation of the motor being accelerating.
-
公开(公告)号：US12208774B2
公开(公告)日：2025-01-28
申请号：US18034363
申请日：2022-07-21
Applicant: MITSUBA Corporation
Inventor： Ryo Ohori
Abstract: A motor device includes a motor having three-phase windings; a rotation speed detector detecting a rotation speed of the motor; a drive signal generator controlling a duty ratio not to exceed a duty ratio upper limit value, and performing control for an energization angle of each phase and performing advance angle control shifting the phase from a reference position to generate a drive signal corresponding to the duty ratio; and an inverter supplying alternating current to the windings based on the drive signal. The drive signal generator includes an advance angle/energization angle controller changing the energization angle to 120 degrees or less while performing advance angle control when the duty ratio is equal to or greater than the duty ratio upper limit value and the rotation speed is equal to or less than a predetermined threshold value in a state where the energization angle is greater than 120 degrees.
-
公开(公告)号：US12009767B2
公开(公告)日：2024-06-11
申请号：US17442576
申请日：2020-03-26
Applicant: MITSUBA Corporation
Inventor： Ryo Ohori , Naoki Shioda , Masaki Hayata , Takashi Yatsuda , Atsushi Kawasaki
CPC classification number: H02P6/16 , B60J7/0573 , B60S1/08 , H02P2209/07 , H02P2209/11 , H02P2209/13
Abstract: A motor control device for controlling a brushless motor including a rotor and a three-phase armature coil includes: a position detection unit which detects the rotational position of the rotor; a control unit which outputs, in a first control mode or a second control mode, a first drive signal or a second drive signal to an inverter at a current-supply timing based on the rotational position of the rotor; and the inverter which outputs a first current-supply signal or a second current-supply signal to the three-phase armature coil when the first drive signal or the second drive signal is input. For any two of the three phases, a duty value when the duty of the applied voltages is the same is larger in the second control mode than in the first control mode.
-
Patent Agency Ranking
公开(公告)号：US11916439B2
公开(公告)日：2024-02-27
申请号：US17312004
申请日：2019-10-01
Applicant: MITSUBA Corporation
Inventor： Ryo Ohori
CPC classification number: H02K1/278 , B60S1/08 , H02K7/1166 , H02K21/16 , H02K29/03
Abstract: Provided are a rotor, a motor, and a wiper motor. An arc center of an outer circumferential surface of a rotor core and an arc center of an inner circumferential surface of a permanent magnet are off-centered radially outward from a rotational axis, with the circumferential center disposed on the radially outermost side. An angle formed by salient pole side surfaces facing each other of circumferentially adjacent two salient poles is equal to an angle formed by magnet side surfaces on both sides circumferentially of the permanent magnet. When the distance between the outer circumferential surface of the rotor core and the radially outermost end of the salient poles is Lt, and the distance between the inner circumferential surface of the permanent magnet and the radially outermost end of the magnet side surfaces is Lme, the distances Lt, Lme are set such that the relationship Lme
-
公开(公告)号：US12191721B2
公开(公告)日：2025-01-07
申请号：US18497936
申请日：2023-10-30
Applicant: MITSUBA Corporation
Inventor： Ryo Ohori
Abstract: Provided is a motor including a stator and a rotor. The rotor includes a rotor core rotating integrally with an rotation shaft and having a core base end part fixed to the rotation shaft and core protrusions protruding outward in a radial direction from the core base end part; and a magnet disposed between the core protrusions adjacent to each other in a circumferential direction on an outer peripheral surface of the core base end part. A central position of the stator core in the axial direction, a central position of the rotor core in the axial direction, and a central position of the magnet in the axial direction are deviated from each other. The central position of the magnet in the axial direction is located between the central position of the stator core in the axial direction and the central position of the rotor core in the axial direction.
-
公开(公告)号：US12191714B2
公开(公告)日：2025-01-07
申请号：US17283951
申请日：2019-08-22
Applicant: MITSUBA Corporation
Inventor： Ryo Ohori , Naoki Shioda
IPC: H02K1/27 , H02K1/2781 , H02K1/2791 , H02K1/28 , H02K3/48
Abstract: A rotor, motor and brushless motor are provided. This rotor (9) includes a rotor core (32), permanent magnets (33), and a protrusion (35) protruding radially outward between permanent magnets (33). The permanent magnets (33) has a parallel orientation in which the easy magnetization direction is parallel to the radial direction in the center of the permanent magnets (33). The circumferential side faces (33d) of the permanent magnets (33) contact the protrusion (35) in the circumferential direction. Connection surfaces (33e) of the permanent magnets (33) are connected to the circumferential side face (33d) and to the outer peripheral surface (33a) on the radial outer side. The front end (35t) of the protrusion (35) in the protrusion direction is arranged between the center (33g) of the circumferential side face (33d) in the protrusion direction and the crossing ridge portion (33h) where the circumferential side face (33d) and the connection surface (33e) cross.
-
公开(公告)号：US11374512B2
公开(公告)日：2022-06-28
申请号：US17292456
申请日：2019-10-01
Applicant: MITSUBA Corporation
Inventor： Ryo Ohori , Naoki Shioda
Abstract: A motor includes: a stator having an annular stator core and multiple teeth protruding radially inwards from the stator core; a coil wound around the teeth; a shaft rotating around the rotation axis radially inside of the stator core; a rotor core fixed to the shaft; magnets positioned on the outer peripheral surface of the rotor core; a salient pole positioned between magnets adjacent to each other in the circumferential direction; an applying portion applying a voltage to the coil; and an applying control portion controlling the applying portion. The ratio of the number of magnetic poles of the magnets and the number of teeth is 2:3. The voltage is a rectangular wave, and its application is started when the tip of the salient pole does not face an opening in the teeth.
-
公开(公告)号：US11289960B2
公开(公告)日：2022-03-29
申请号：US16632370
申请日：2018-06-26
Applicant: MITSUBA Corporation
Inventor： Ryo Ohori , Naoki Shioda , Gensaku Yamakami
Abstract: A motor and a brushless wiper motor are provided. The motor (2) includes: a stator (8); coils (24); a shaft (31); a rotor core (32); magnets (33) which are disposed on an outer peripheral surface (32b) of the rotor core (32) and a radial thickness of which at end portions (33s) on both sides in the circumferential direction around the rotation axis is smaller than a radial thickness in a circumferential intermediate portion; and salient poles (35) that are formed between magnets (33) adjacent in the circumferential direction of the outer peripheral surface (32b) of the rotor core (32) and protrude radially outward from the end portions (33s) of the magnets (33) in the circumferential direction. The width dimensions of the salient poles (35) in the radial direction being set to 40° or less in a form of an electrical angle.
-
-
-
-
-
-
-
Search Results
18
records
(took 0.015 seconds)
