Kiryu, Japan
Kiryu, Japan

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Patent
Mitsuba Corporation | Date: 2016-10-28

A wiper motor has: a magnet disposed on the yoke and formed with at least four poles; an armature disposed on an inner side of the magnet; a speed reduction mechanism unit having an output shaft for transmitting the rotation of the armature shaft; a gear housing connected to the yoke; a gear housing cover covering an opening of the gear housing; a magnet attached to the output shaft of the speed reduction mechanism unit; an absolute position detecting sensor disposed so as to face the magnet; and a control board having the absolute position detecting sensor attached thereto, the control board being disposed between the gear housing and the gear housing cover, and configured to control the rotation of the armature shaft.


Patent
Mitsuba Corporation | Date: 2016-08-03

A magnet 34 for the rotating shaft (first magnet, second magnet) is installed on the extended portion of the rotating shaft 33b in the gear housing 41, and Hall ICs 65a to 65c for the rotating shaft (first sensor, second senor) are formed on the control board 60 inside the gear housing 41 so as to face the magnet 34 for the rotating shaft. The Hall ICs 65a to 65c for the rotating shaft are adapted to detect the rotation position of the rotating shaft 33b relative to the stator 32, that is, the rotation position of the rotor 33 relative to the stator 32, and the Hall ICs 65a to 65c for the rotating shaft are adapted to detect the rotation number of the rotating shaft 33b.


Patent
Mitsuba Corporation | Date: 2016-05-18

In an electric motor, a brush holder stay (33) has an opening section through which a commutator (23) is able to be inserted in a rotary shaft direction (O1), brush holders (41) extend in the rotary shaft direction (O1) and are formed in a flat spring shape biased toward the inside in a radial direction, base end sections of the brush holders (41) are supported by the brush holder stay (33) at intervals in a circumferential direction around the rotary shaft (3), and brushes (31) are held by the front end sections of the brush holders (41).


Patent
Mitsuba Corporation | Date: 2016-06-15

A brushless motor (1) includes a stator (2) including a stator core (5) formed by laminating a plurality of stator core plates (17), and a rotor (3) including a rotor core (15) formed by laminating a plurality of rotor core plates (18). The rotor core (15) includes a core body (15a), a magnet mounting hole (31) in which a magnet (16) is housed, and a salient pole portion (32) formed on an outer peripheral side of the magnet (16). An axial direction length Lr of the rotor core (15) is longer than an axial direction length Lm of the magnet (16) (Lr>Lm). A first overhang portion (41) is formed on both end portions of the rotor core (15). An axial direction length Ls of the stator core (5) is longer than the axial direction length Lr of the rotor core (15) (Ls>Lr). A second overhang portion (42) is formed on both end portions of the stator core (5).


Patent
Mitsuba Corporation | Date: 2016-02-03

A magnetic power generator (1) includes a stator and a rotor. The stator includes a plurality of salient poles (14) made up of a magnetic path section (15) around which a coil is wound and a protrusion section (16) that protrudes toward both sides of a front end of the magnetic path section. A plurality of permanent magnets (6) are attached to the rotor to face the salient poles (14). The salient poles (14) having the same phase are adjacently disposed in the circumferential direction, and a coil having the same phase is wound in series around the adjacently disposed salient poles (14) having the same phase. A front end portion (17) made up of a front end part of the magnetic path section (15) and the protrusion section (16) is configured so that a disposition angle (2) between the front end sections (17) having the same phase is equal to or less than the pole arc angle (p) of the permanent magnet (6), and is greater than the disposition angle of the adjacent front end sections (17) having different phases. The magnetic path section (15) in the salient pole (14) adjacent to the salient pole (14) having a different pole is disposed on the same phase side of the center line of the front end section (17) of the salient pole (14) adjacent to the salient pole (14) having a different pole.


Patent
Mitsuba Corporation | Date: 2016-03-14

An object of the present invention is to provide a brushless motor and a wiper apparatus which allow high-precision control of a motor unit, and which can be reduced in size and weight. The first surface (91) of the control board (90) is provided on the same side as the rotating shaft (46) and the output shaft (51) so as to face the sensor magnet (MG1), the first and second Hall ICs (94a) and (94b) are mounted on the first surface (91). The second surface (92) of the control board (90) is provided on the opposite side from the first surface (91), and the third Hall IC (94c) is mounted on the second surface (92), and located between the first and second Hall ICs (94a) and (94b) so as to face the sensor magnet (MG1). In addition, the MR sensor (95) is mounted on the first surface (91) so as to face the second sensor magnet (MG2).


Patent
Mitsuba Corporation | Date: 2016-06-27

An electric motor is subjected to PWM duty control based on a target speed (tgt spd) set according to a position of a wiper blade. After a deceleration start position of wiping operation, the electric motor is driven at a PWM duty value (sld sta dutyKsd) obtained by multiplying a PWM duty value (sld sta duty) at the deceleration start position by a predetermined deceleration coefficient (Ksd) set according to the blade position. The deceleration coefficient (Ksd) is set according to the position of the wiper blade based on a ratio (tgt spd/pek tgt spd) between the target speed (pek tgt spd) of the wiper blade at the start of deceleration and the target speed (tgt spd) of the wiper blade.


Patent
Mitsuba Corporation | Date: 2016-02-03

This magnet generator (1) includes a stator having a plurality of salient poles (14), each of which is configured of a magnetic path portion (15) around which a coil is wound and a protrusion (16) protruding from a tip of the magnetic path portion (15), and a rotor (2) having a plurality of permanent magnets (6) attached to be opposite to the salient poles (14). The salient poles (14) are configured such that each of the magnetic path portions has an approximately same arrangement angle between the adjacent magnetic path portions. Distal ends (17) configured of distal end parts of the magnetic path portion (15) and the protrusions (16) are set such that an arrangement angle between the distal ends (17) that are in phase is set to be same as a pole arc angle of each of the permanent magnets (6).


Patent
Mitsuba Corporation | Date: 2016-11-16

The swing member (63) to be subjected to swinging drive is integrally provided to the output shaft (56) outside the speed reducer case (52), the speed reducer case (52) is provided with a pair of swing regulating portions (61, 62) which prevents the swing member (63) from being moved beyond the wiping-allowable limit angle (b) by contacting the swing member (63). As a result, the swing member (63) and the swing regulating portions (61, 62) can collectively form the regulating member (60). As a result, essential components (such as fixing plate) can be omitted from the conventional wiper apparatus. Therefore, the wiper apparatus can be improved in assembly workability, size and weight by reducing the number of components thereof, and provided with a regulating member (60) which prevents the wiper member being moved beyond the wiping-allowable limit angle (b).


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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