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公开(公告)号：US10116186B2
公开(公告)日：2018-10-30
申请号：US14780184
申请日：2014-03-26
Applicant: Mitsuba Corporation
Inventor： Takeshi Kanai , Hiroto Tanaka , Tomohiko Annaka , Naoki Kojima , Hirokazu Shoda
IPC: H02K7/116 , H02K9/22 , B60S1/16 , H02K5/02 , H02K11/33 , H02K5/16 , H02K5/18 , H02K5/22 , H02K11/00
Abstract: A motor case (31) in which a stationary portion (35) is fixed, and a gear case (41) in which a gear mechanism (SD) is accommodated are made of aluminium, most heat generated from the stationary portion (35) at the time of actuation of a brushless wiper motor (20) can be directly dissipated outside from the motor case (31). That is, compared with conventional technique, heat transmitted to the motor case (31) can be efficiently dissipated outside, and the motor case (31) does not reach high temperature. Therefore, as a matter of course, reduction in size and weight can be achieved, suppression of electromagnetic noise can be achieved, and heat-resistance strength can be enhanced. Expensive components capable of resisting high temperatures are not required, and reduction in manufacturing cost can be achieved.
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公开(公告)号：US20170313283A1
公开(公告)日：2017-11-02
申请号：US15525304
申请日：2015-11-04
Applicant: Mitsuba Corporation
Inventor： Naoki Kojima , Masaaki Kimura , Yukiyoshi Iso
Abstract: In a brushless wiper motor, first and second pressing claws (43a and 43b) are formed on an outer periphery (OP) of steel sheets (34a) forming a stator core (34), and press-fitted to an inner periphery (IP) of the motor housing unit (31) so that the stator core (34) is fixed to the motor housing unit (31), base end portions of the first and second pressing claws (43a and 43b) are respectively connected to first and second walls formed on the outer periphery (OP) of the steel sheets (34a), and tip end portions of the first and second pressing claws (43a and 43b) each serves as a free end, and are directed in a circumferential direction of the stator core (34).
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公开(公告)号：US20170222581A1
公开(公告)日：2017-08-03
申请号：US15490966
申请日：2017-04-19
Applicant: Mitsuba Corporation
Inventor： Masaaki Kimura , Hiroto Tanaka , Tamotsu Iwazaki , Tomohiko Annaka , Naoki Kojima , Junya Kitazawa
CPC classification number: H02P6/153 , B60S1/08 , B60S1/0818 , B60S1/0896 , B60S1/166 , B60S1/26 , H02K7/1166 , H02K11/215 , H02P6/08 , H02P6/16 , H02P6/182 , H02P6/22 , H02P23/009 , H02P2207/05
Abstract: A brushless motor comprises: a stator 21 having armature coils 21a, 21b, and 21c; a rotor 22 which is rotated by a revolving magnetic field; and a switching element 30a, wherein the brushless motor has a rotation number control unit 33 which switches between low-speed and high-speed mode, wherein in the low-speed mode, the rotation number control unit 33 supplies current to the armature coils 21a, 21b, and 21c at predetermined energization timing and controls a duty ratio to control the rotation number of the rotor 22, and in the high-speed mode, the rotation number control unit 33 supplies current to the armature coils 21a, 21b, and 21c at energization timing advanced from the energization timing for the low-speed mode, thereby performing field weakening control of weakening the revolving magnetic field from that of the low-speed mode to control the rotation number of the rotor 22.
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公开(公告)号：US11894753B2
公开(公告)日：2024-02-06
申请号：US16982052
申请日：2019-04-03
Applicant: MITSUBA Corporation
Inventor： Naoki Kojima , Motoaki Kobayashi , Teppei Tokizaki , Yoshichika Kawashima
Abstract: A deceleration mechanism is provided with first and second gears, a first tooth part arranged in the first gear and extending spirally in an axial direction of the first gear, an engagement projected part arranged on the first tooth part, second tooth parts arranged on the second gear, and an engagement recessed part arranged between the adjacent second tooth parts. The engagement projected part is formed in an arc shape in a direction orthogonal to the axial direction of the first gear and has a curvature center eccentric from a rotation center of the first gear. The second tooth parts are inclined with respect to the axial direction of the first gear and arranged in a circumferential direction of the second gear. The engagement projected part is formed in an arc-shape in a direction orthogonal to the axial direction of the first gear and engaged with the engagement projected part.
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公开(公告)号：US11719310B2
公开(公告)日：2023-08-08
申请号：US17607897
申请日：2020-06-26
Applicant: MITSUBA Corporation
Inventor： Teppei Tokizaki , Naoki Kojima , Motoaki Kobayashi , Shunji Kumagai
CPC classification number: F16H1/08 , F16H55/08 , F16H2055/0893
Abstract: A speed reduction mechanism and a motor equipped with the speed reduction mechanism are provided. A pinion gear is provided with one spiral engagement projected part, and a helical gear is provided with a plurality of engagement recessed parts with which the engagement projected part is engaged. The engagement projected part and the engagement recessed part are formed so that their cross-sectional shapes along a direction orthogonal to an axial direction of the pinion gear are in arc shapes. A shape of helical teeth and a shape of the engagement recessed part are determined based on a shape of the engagement projected part provided on a spiral tooth.
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Patent Agency Ranking
公开(公告)号：US20190047517A1
公开(公告)日：2019-02-14
申请号：US16079329
申请日：2017-02-17
Applicant: Mitsuba Corporation
Inventor： Naoki Kojima , Tomohiko Annaka
Abstract: A motor control apparatus that controls a brushless motor which operates a wiper arm so as to swing, the motor control apparatus including: a position detection part that detects a rotation position of a rotor; and a control part that performs a sine wave drive of the brushless motor at a time of a low output mode in which an output of the brushless motor is low and that, at a time of a high output mode in which an output is higher than an output at the time of the low output mode, allows a power distribution angle to be an angle that is larger than 120 degrees and distributes power to the brushless motor at a timing when a predetermined electric angle is advanced with reference to the rotation position of the rotor.
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公开(公告)号：US20180358911A1
公开(公告)日：2018-12-13
申请号：US15778302
申请日：2017-02-03
Applicant: Mitsuba Corporation
Inventor： Naoki Kojima , Tomofumi Kobayashi , Atsushi Kawasaki
IPC: H02P6/15
CPC classification number: H02P6/153 , G05B19/4015 , H02P6/20 , H02P2203/03
Abstract: A motor drive apparatus includes: a stage determination part that determines a position of the rotor based on a combination of states of a plurality of the output signals; and a power distribution timing determination part which determines that a power distribution timing when power is distributed to the coil is a timing obtained by advancing an angle by an amount that corresponds to a predetermined electric angle in a startup time of the motor, wherein, when a rotation speed of the motor becomes a predetermined rotation speed or more, the power distribution timing determination part determines that a timing when a predetermined period of time elapses since a position of the rotor arrives at a position of an electric angle that corresponds to a displacement amount of an electric angle which is arbitrarily advanced with respect to a predetermined electric angle that is advanced in the startup time is a power distribution timing.
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公开(公告)号：US20160056686A1
公开(公告)日：2016-02-25
申请号：US14780184
申请日：2014-03-26
Applicant: MITSUBA CORPORATION
Inventor： Takeshi Kanai , Hiroto Tanaka , Tomohiko Annaka , Naoki Kojima , Hirokazu Shoda
CPC classification number: H02K7/116 , B60S1/166 , H02K5/02 , H02K5/16 , H02K5/18 , H02K5/22 , H02K7/1166 , H02K9/22 , H02K11/0073 , H02K11/33 , H02K2213/03
Abstract: A motor case (31) in which a stationary portion (35) is fixed, and a gear case (41) in which a gear mechanism (SD) is accommodated are made of aluminium, most heat generated from the stationary portion (35) at the time of actuation of a brushless wiper motor (20) can be directly dissipated outside from the motor case (31). That is, compared with conventional technique, heat transmitted to the motor case (31) can be efficiently dissipated outside, and the motor case (31) does not reach high temperature. Therefore, as a matter of course, reduction in size and weight can be achieved, suppression of electromagnetic noise can be achieved, and heat-resistance strength can be enhanced. Expensive components capable of resisting high temperatures are not required, and reduction in manufacturing cost can be achieved.
Abstract translation: 其中固定有固定部分（35）的马达壳体（31）和容纳有齿轮机构（SD）的齿轮箱（41）由铝制成，从固定部分（35）在 无刷电动机（20）的致动时间可以直接从电动机壳体（31）散发到外部。 也就是说，与传统技术相比，传递到马达壳体（31）的热量可以有效地散发到外部，并且马达壳体（31）不达到高温。 因此，当然可以实现小型化和轻量化，可以抑制电磁噪声，提高耐热强度。 不需要能够抵抗高温的昂贵的组件，并且可以实现制造成本的降低。
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公开(公告)号：US09923494B2
公开(公告)日：2018-03-20
申请号：US15657564
申请日：2017-07-24
Applicant: Mitsuba Corporation
Inventor： Masaaki Kimura , Hiroto Tanaka , Tamotsu Iwazaki , Tomohiko Annaka , Naoki Kojima , Junya Kitazawa
CPC classification number: H02P6/153 , B60S1/08 , B60S1/0818 , B60S1/0896 , B60S1/166 , B60S1/26 , H02K7/1166 , H02K11/215 , H02P6/08 , H02P6/16 , H02P6/182 , H02P6/22 , H02P23/009 , H02P2207/05
Abstract: A brushless motor comprises: a stator 21 having armature coils 21a, 21b, and 21c; a rotor 22 which is rotated by a revolving magnetic field; and a switching element 30a, wherein the brushless motor has a rotation number control unit 33 which switches between low-speed and high-speed mode, wherein in the low-speed mode, the rotation number control unit 33 supplies current to the armature coils 21a, 21b, and 21c at predetermined energization timing and controls a duty ratio to control the rotation number of the rotor 22, and in the high-speed mode, the rotation number control unit 33 supplies current to the armature coils 21a, 21b, and 21c at energization timing advanced from the energization timing for the low-speed mode, thereby performing field weakening control of weakening the revolving magnetic field from that of the low-speed mode to control the rotation number of the rotor 22.
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公开(公告)号：US20180041078A1
公开(公告)日：2018-02-08
申请号：US15784729
申请日：2017-10-16
Applicant: Mitsuba Corporation
Inventor： Yoshichika Kawashima , Teppei Tokizaki , Naoki Kojima
CPC classification number: H02K1/17 , H02K1/265 , H02K3/28 , H02K5/148 , H02K7/1166 , H02K11/026 , H02K11/25 , H02K13/006 , H02K23/04 , H02K23/32
Abstract: An electric motor includes a yoke having a cylindrical section, two pairs of permanent magnets disposed at an inner circumferential surface of the cylindrical section to oppose each other, and an armature rotatably supported further inside in a radial direction than the permanent magnets, wherein at least a pair of first flat sections opposing each other in the radial direction are formed at the cylindrical section, and the permanent magnets are disposed at positions distant from the first flat sections.
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