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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：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：US10594233B2
公开(公告)日：2020-03-17
申请号：US15958095
申请日：2018-04-20
Applicant: Mitsuba Corporation
Inventor： Tomohiko Annaka , Hiroto Tanaka , Naoki Kojima , Toru Furusawa , Tomofumi Kobayashi
Abstract: A brushless motor (18) which supplies currents to coils (U1, U2, V1, V2, W1, and W2) and rotates a rotor (27), the brushless motor comprising a control apparatus (37) which switches and selectively executes: first energization control to start energization to the coils (U1, U2, V1, V2, W1, and W2) at first timing, and to continue the energization for a first period to control the rotation number of the rotor (27); and second energization control to start energization to the coils (U1, U2, V1, V2, W1, and W2) at second timing advanced by an electric angle with respect to the first timing, and to continue the energization for a second period longer than the first period to control the rotation number of the rotor (27).
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4.发明申请公开(公告)号：US20180323733A1
公开(公告)日：2018-11-08
申请号：US15958095
申请日：2018-04-20
Applicant: Mitsuba Corporation
Inventor： Tomohiko Annaka , Hiroto Tanaka , Naoki Kojima , Toru Furusawa , Tomofumi Kobayashi
Abstract: A brushless motor (18) which supplies currents to coils (U1, U2, V1, V2, W1, and W2) and rotates a rotor (27), the brushless motor comprising a control apparatus (37) which switches and selectively executes: first energization control to start energization to the coils (U1, U2, V1, V2, W1, and W2) at first timing, and to continue the energization for a first period to control the rotation number of the rotor (27); and second energization control to start energization to the coils (U1, U2, V1, V2, W1, and W2) at second timing advanced by an electric angle with respect to the first timing, and to continue the energization for a second period longer than the first period to control the rotation number of the rotor (27).
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公开(公告)号：US09735717B1
公开(公告)日：2017-08-15
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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Patent Agency Ranking
公开(公告)号：US10442401B2
公开(公告)日：2019-10-15
申请号：US16029989
申请日：2018-07-09
Applicant: Mitsuba Corporation
Inventor： Masaaki Kimura , Tomohiko Annaka , Toshiyuki Kimura
IPC: B60S1/08 , H02K21/14 , H02K7/14 , B60S1/16 , H02K29/08 , H02K7/08 , H02K11/33 , H02P6/08 , B60S1/04
Abstract: Since a shape of a stator 44 is made mirror symmetric with respect to a rotor 45 as a 4-pole/6-slot type, rotational deflection of the rotor 45 can be suppressed. As the minimum number of poles and the minimum number of slots, which can suppress the rotational deflection of the rotor 45, a frequency of magnetic noises approaches a frequency of mechanical noises. Thus, it is possible to integrate the whole noises generated by the DR-side wiper motor 21 into a low frequency range thereof, and to make the acoustic sensitivity (dB) of a vehicle interior smaller. Since the stator 44 is fixed inside a housing 40 and mounting legs fixed to a vehicle body fixed portion are provided in the housing 40, the stator 40, which is a source of the magnetic noises, can be fixed to a vehicle via only the housing 40. Therefore, a brushless wiper motor with quietness improved further can be designed.
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公开(公告)号：US20180086308A1
公开(公告)日：2018-03-29
申请号：US15565531
申请日：2016-04-06
Applicant: Mitsuba Corporation
Inventor： Masaaki Kimura , Tomohiko Annaka , Toshiyuki Kimura
CPC classification number: B60S1/0822 , B60S1/08 , H02K7/14 , H02K21/14 , H02P6/08 , Y02T10/641
Abstract: Since a shape of a stator 44 is made mirror symmetric with respect to a rotor 45 as a 4-pole/6-slot type, rotational deflection of the rotor 45 can be suppressed. As the minimum number of poles and the minimum number of slots, which can suppress the rotational deflection of the rotor 45, a frequency of magnetic noises approaches a frequency of mechanical noises. Thus, it is possible to integrate the whole noises generated by the DR-side wiper motor 21 into a low frequency range thereof, and to make the acoustic sensitivity (dB) of a vehicle interior smaller. Since the stator 44 is fixed inside a housing 40 and mounting legs fixed to a vehicle body fixed portion are provided in the housing 40, the stator 40, which is a source of the magnetic noises, can be fixed to a vehicle via only the housing 40. Therefore, a brushless wiper motor with quietness improved further can be designed.
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公开(公告)号：US09660559B2
公开(公告)日：2017-05-23
申请号：US14394628
申请日：2013-04-16
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：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：US10040426B2
公开(公告)日：2018-08-07
申请号：US15565531
申请日：2016-04-06
Applicant: Mitsuba Corporation
Inventor： Masaaki Kimura , Tomohiko Annaka , Toshiyuki Kimura
Abstract: Since a shape of a stator 44 is made mirror symmetric with respect to a rotor 45 as a 4-pole/6-slot type, rotational deflection of the rotor 45 can be suppressed. As the minimum number of poles and the minimum number of slots, which can suppress the rotational deflection of the rotor 45, a frequency of magnetic noises approaches a frequency of mechanical noises. Thus, it is possible to integrate the whole noises generated by the DR-side wiper motor 21 into a low frequency range thereof, and to make the acoustic sensitivity (dB) of a vehicle interior smaller. Since the stator 44 is fixed inside a housing 40 and mounting legs fixed to a vehicle body fixed portion are provided in the housing 40, the stator 40, which is a source of the magnetic noises, can be fixed to a vehicle via only the housing 40. Therefore, a brushless wiper motor with quietness improved further can be designed.
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