Mitsuba Corporation

Kiryu, Japan

Mitsuba Corporation

Kiryu, Japan

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Patent
Mitsuba Corporation | Date: 2017-05-10

An electric power steering system 1 uses a brushless motor 3 as a drive source. The brushless motor 3 includes a stator 13 in which stator coils 17 are wound in a distributed manner and a rotor 14 rotatably disposed inside the stator 13. In the rotor 14, four sets of slit groups 31 each having circular-arc shaped slits 31a to 31c are formed. Rotor magnets 32 which are bonded magnets are filled in the slits 31a to 31c. The rotor magnets 32 are polar anisotropically magnetized. The rotor 14 is rotated by a magnet torque generated by the rotor magnets 32 and a reluctance torque based on a difference in inductance between magnetic paths so as to supply a steering assist force.


Patent
Mitsuba Corporation | Date: 2017-05-03

When the number of times of vehicle speed detections reaches a prescribed times n, a DR-side wiper blade is moved in such a way that when the front end side of a lip reaches a lower-side stop position APS1, the DR-side wiper blade is temporarily moved to a lower limit position for stop EPSL, then moved to an upper-side stop position APS2 and stopped there, and in such a way that when the front end side of the lip reaches an upper-side stop position APS2, the DR-side wiper blade is moved temporarily to an upper limit position for stop EPSU, then moved to the lower-side stop position APS1 and stopped there.


Patent
Mitsuba Corporation | Date: 2017-05-24

A gear side feeding terminal (73U, 73V, 73W) connected to a motor side feeding terminal (36U, 36V, 36W) provided to the end portion of a stator (32) in the axial direction of the stator (32) from the axial direction of a rotor (38) is provided on a control board (70) for controlling the rotor (38), housed in a gear case (61) so as to be stacked on a speed reduction mechanism (SD) from the direction crossing the axial direction of the rotor (38). In this manner, the wiper motor is composed of a brushless wiper motor (20), and it is unnecessary to provide the gear side feeding terminal (73U, 73V, 73W) so as to avoid the control board (70). Accordingly, it is possible to prevent electric noises, and provide a wiper motor reduced in size and weight, and since it is unnecessary to form a clearance in the control board (70), it is possible to provide a wiper motor further improved in degree of freedom for designing the control board (70).


Patent
Mitsuba Corporation | Date: 2017-05-24

A motor case part (30) having a stator (36) and a gear case part (50) having a reduction mechanism (SD) are integrally formed of the same material. In this manner, heat is directly dissipated from the motor case part (30) to the outside without the gear case part (30). Therefore, a brushless wiper motor (20) can be improved in heat radiation performance so as to enhance strength in high temperature can be realized. By manufacturing the motor case part (30) and the gear case part (50) from aluminum, while sufficient radiation performance is secured, a thickness thereof is made thin and lack in rigidity can be overcome. Furthermore, It is unnecessary to manufacture the motor case part (30) and the gear case part (50) individually and it is also unnecessary to perform pressing to a steel plate like the conventional art. Therefore, workability of the motor case part (30) and the gear case part (50) can be improved.


Patent
Mitsuba Corporation | Date: 2017-05-24

In a brushless wiper motor, a rotor (33) is rotatably provided inside a stator (32) provided with a coil (32b), one end side of a rotation shaft (34) in the axial direction is fixed to the axial center of the rotor (33), a worm (35) is provided on the other end side of the rotation shaft (34) in the axial direction, the first and second bearings (36, 37) are respectively provided on one end side of the rotation shaft (34) in the axial direction and the other end side of the rotation shaft (34) in the axial direction than the worm (35) of the rotation shaft (34), the rotation shaft (34) is rotatably supported by only the first and second bearings (36, 37), and with the position of the first bearing (36) being defined as a reference position, a length thereof in the axial direction to the second bearing (37) is longer than a length thereof in the axial direction to the rotor (33). Since a commutator and other parts are not provided on a free end side of the rotation shaft (34), it is possible to provide a brushless wiper motor reduced in length of the rotation shaft (34), and reduced in inertial mass of the free end side of the rotation shaft (34).


Patent
Mitsuba Corporation and Honda Corporation | Date: 2017-06-14

A nozzle unit 34 which jets washer fluid toward a windshield is fixed to an arm piece 33 whose front end side is fitted to a hook fixing member 23e. As a result, the nozzle unit 34 can be fixed without using the fitting member adopted in the conventional case, and located closer to the hook fixing member 23e. This reduces a positional shift of the nozzle unit 34 relative to the wiper blade 20 to the minimum, thus stabilizing the injection-target locations of washer fluid on the windshield.


Patent
Mitsuba Corporation | Date: 2017-06-14

When an ECU 41 for wiper motor detects that a SP operation has been carried out in the midst of swinging motion of a wiper blade, the ECU 41 for wiper motor outputs a motor stopping signal to an ECU 42 for washer pump. When the ECU 42 for washer pump receives the motor stopping signal, the ECU 42 for washer pump stops a washer pump 30 even if an injection switch for jetting out washer fluid is on. In this manner, when a wiper blade is stopped from being swung for replacement of the wiper member, the pump for causing washer fluid to jet out is stopped. Therefore, it is possible to prevent the waste of washer fluid, and to further save washer fluid.


Patent
Mitsuba Corporation | Date: 2017-06-07

When teeth (12) are allocated in a circumferential direction in sequence of a U phase, a V phase and a W phase, a forward wound coil wound on each of the phases is provided as a coil of the U phase, the V phase and the W phase, and a reverse wound coil wound on each of the phases is provided as the coil of a -U phase, a -V phase and a -W phase, the coils are electrically connected between the neighboring segments in an order of the U phase, the -W phase, the -W phase, the V phase, the -U phase, the -U phase, the W phase, the -V phase and the -V phase, and the wire (14) drawn between the armature core (8) and the commutator (10) is drawn around the rotation shaft in the same direction.


Patent
Mitsuba Corporation | Date: 2017-08-02

A toothed part 22 has a tooth main body 24 and a tip part 25. A pair of slant parts 26 are formed in a protruding manner on both sides of the tooth tip part 25. A tip surface 27 is formed on the inner diameter side end surface of the tip part 25 so as to face a magnet 15 through an air gap g. A groove part 28 is formed so as to be recessed in the center of the tip surface 27 and to extend in the axial direction. A depth d of the groove part 28 is set to satisfy 0 < d (Lx - Rt) /3 . A width Wg of the groove part 28 is set to satisfy Wt > Wg >_ Wt/2 (Lx: distance between the center of the rotor and a tooth/slant intersection X, the intersection X being the intersection between an extension line P of a circumferential side surface of the tooth main body and an extension line Q of a slope of the slant part, Rt: radius of the inner diameter of the tooth tip surface, Wt: width of the tooth main body).


Patent
Mitsuba Corporation | Date: 2017-04-19

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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