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公开(公告)号：US20230373442A1
公开(公告)日：2023-11-23
申请号：US18034363
申请日：2022-07-21
Applicant: MITSUBA Corporation
Inventor： Ryo OHORI
CPC classification number: B60S1/0807 , H02K11/33
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.
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公开(公告)号：US20210328528A1
公开(公告)日：2021-10-21
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.
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公开(公告)号：US20200083789A1
公开(公告)日：2020-03-12
申请号：US16610949
申请日：2018-05-01
Applicant: MITSUBA Corporation
Inventor： Ryo OHORI , Naoki SHIODA , Tomoyasu SUGIYAMA , Masaki HAYATA
IPC: H02K29/08 , H02K11/215
Abstract: A brushless motor includes: a stator having a stator core and a winding; a rotor having a magnet; and a magnetic sensor for detecting the rotational position of the rotor. The rotor has a skew structure, and the magnet is skew-magnetized. The magnet has an overhang part. The magnetic sensor is disposed opposite to an axial end surface of the overhang part. The skew angle of the magnet is set in accordance with the angular deviation of sensor arrangement corresponding to motor specifications such as Δ-connection or sine wave drive in a state where the magnetic sensor is disposed at an optimum position less affected by a winding field.
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公开(公告)号：US20220173642A1
公开(公告)日：2022-06-02
申请号：US17601716
申请日：2020-06-23
Applicant: MITSUBA Corporation
Inventor： Ryo OHORI
Abstract: Provided are a motor with which dynamic unbalance of a rotor can be suppressed, and a deterioration in the motor characteristics can be reduced, and a method for manufacturing said motor. In a motor unit: a rotor central position, a magnet central position, and a stator central position are offset from one another; a length L1 between inner wall surfaces, facing one another in an axial direction, of magnet holders, an axial direction magnet length L2 of magnets, and an offset length L3 satisfy L1−L2
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公开(公告)号：US20220006342A1
公开(公告)日：2022-01-06
申请号：US17295447
申请日：2019-11-11
Applicant: MITSUBA Corporation
Inventor： Ryo OHORI , Koji YONEKAWA , Takeshi KANAI
Abstract: A rotor is provided with: a rotor core (32); a plurality of permanent magnets (33); a substantially tubular magnet cover (71); and a load reception block (70). The rotor core (32) rotates integrally with a rotary shaft of a motor. The permanent magnets (33) are arranged on the outer peripheral part of the rotor core (32). The magnet cover (71) covers the exterior of the plurality of permanent magnets (33) and the rotor core (32), and has a flange part which is bent radially inward at the end along a rotation axis. The load reception block (70) is disposed between the flange part and the end surface of the rotor core (32) in a direction along the rotation axis, and abuts against the flange part and the rotor core (32).
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Patent Agency Ranking
公开(公告)号：US20240123943A1
公开(公告)日：2024-04-18
申请号：US18327880
申请日：2023-06-01
Applicant: MITSUBA Corporation
Inventor： Ryo OHORI , Toshiyuki AMAGASA , Masahiro YAMADA , Atsushi MOCHIDA , Tamotsu IWAZAKI
IPC: B60S1/08
CPC classification number: B60S1/08
Abstract: A motor control device includes a driving control part and an upper limit value setting part. The driving control part controls motor driving by switching between a first driving mode and a second driving mode, and controls an output duty ratio so as not to exceed a duty ratio upper limit value. The upper limit value setting part sets, as the duty ratio upper limit value, a low rotation duty ratio upper limit value, a maximum duty ratio upper limit value corresponding to a maximum output value, and an upper limit value of a transition period from the low rotation duty ratio upper limit value to the maximum duty ratio upper limit value, and changes slope information indicating a change amount in the upper limit value of the transition period according to the driving mode when switching between the first driving mode and the second driving mode.
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公开(公告)号：US20220190756A1
公开(公告)日：2022-06-16
申请号：US17442576
申请日：2020-03-26
Applicant: MITSUBA Corporation
Inventor： Ryo OHORI , Naoki SHIODA , Masaki HAYATA , Takashi YATSUDA , Atsushi KAWASAKI
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.
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公开(公告)号：US20210384783A1
公开(公告)日：2021-12-09
申请号：US17283951
申请日：2019-08-22
Applicant: MITSUBA Corporation
Inventor： Ryo OHORI , Naoki SHIODA
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.
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公开(公告)号：US20230421084A1
公开(公告)日：2023-12-28
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.
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公开(公告)号：US20210028678A1
公开(公告)日：2021-01-28
申请号：US17042179
申请日：2019-03-22
Applicant: MITSUBA Corporation
Inventor： Ryo OHORI
Abstract: A motor includes: a stator having teeth protruding radially inward from the inner peripheral surface of a stator core; coils wound on the teeth; a shaft rotating on the inside radially of the stator core; a rotor core affixed to the shaft and radially centered on the rotation axis of the shaft; permanent magnets arranged on the outer peripheral surface of the rotor core; projecting poles which are formed projecting radially outward between the permanent magnets adjacent to each other in the circumferential direction of the outer peripheral surface of the rotor core, and with which the projecting contact surfaces of the permanent magnets are in contact. The stator is formed by stacking electromagnetic steel sheets in the direction of the rotation axis of the shaft. At least one of the axial ends of each of the permanent magnets projects further than an axial end of the rotor core.
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