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.

Abstract: A wiper control method and a wiper control device are provided. An arm falling position for stopping wiper arms for a predetermined time is set above a lower reversal position. When the wiper arms stopped on the side of an upper reversal position with respect to the arm falling position, such as a service position, are moved to a storage position set below the lower reversal position, or when a wiping operation is to be performed again, the wiper arms are temporarily stopped for the predetermined time at the arm falling position. Then, after the predetermined time elapses, the wiper arms are moved to the storage position in the case of a storage operation, and moved to the upper reversal position in the case of restarting, and then the normal wiping operation is performed.

Abstract: A wiping device wipes off rainwater on a wiped surface by reciprocating a wiper blade using a predetermined power source. The wiping device includes: a drive circuit, driving the power source, and a control part, controlling the drive circuit. The control part switches a wiping range at an upper reversal position of the wiper blade.

Abstract: A speed reducer includes a casing, a crankshaft, and a speed reducer main body. The crankshaft has a rotation support part rotatably supported by the casing and an eccentric part eccentric with respect to the rotation support part. The speed reducer main body has an engagement part engaged with an outer circumferential surface of the eccentric part, decelerates rocking rotation of the eccentric part received by the engagement part, and outputs the decelerated rotation to outside. The crankshaft is provided with a flange part protruding to an outward side in a radial direction from an end part of the rotation support part on the eccentric part side and abutting an end surface of the engagement part in an axial direction. The flange part is formed such that a center thereof coincides with a center of the eccentric part in a direction orthogonal to the axial direction.

Abstract: A motor control device and a motor control method capable of performing power limitation of a drive circuit more accurately are provided. A motor control device for controlling a motor by supplying a drive signal generated on the basis of a rotation command value by a drive circuit to the motor includes a voltage detection part that detects a voltage of the drive signal as a load voltage, a current detection part that detects a current of the drive signal as a load current, and a power limitation part that detects a load power of the drive circuit on the basis of the load voltage and the load current, and decreases the rotation command value when the load power exceeds a predetermined upper limit value to perform power limitation.

Abstract: A speed reducer includes a casing, a crankshaft, and a speed reducer main body. The crankshaft has a rotation support part rotatably supported by the casing and an eccentric part eccentric with respect to the rotation support part. The speed reducer main body has an engagement part engaged with an outer circumferential surface of the eccentric part, decelerates rocking rotation of the eccentric part received by the engagement part, and outputs the decelerated rotation to outside. The crankshaft is provided with a flange part protruding to an outward side in a radial direction from an end part of the rotation support part on the eccentric part side and abutting an end surface of the engagement part in an axial direction. The flange part is formed such that a center thereof coincides with a center of the eccentric part in a direction orthogonal to the axial direction.

Abstract: A fan device (1) includes a shroud (4) including a motor support unit (42), a fan (3) disposed on a surface side of the motor support unit (42), and a motor (2) supported on a rear side of the motor support unit (42). Multiple air guide passages (426) each penetrating in a thickness direction at positions spaced apart in a circumferential direction and radially outward from a boss 31 of the fan (3) are formed in the motor support unit (42). The fan device (1) further includes an air guide unit (52) that is disposed facing the air guide passage (426) on the rear side of the motor support unit (42), and guides cooling air generated by the fan (3) and passed through the air guide passage (426) to a rear side of a motor bracket (21).

Abstract: A motor and a fan device are provided. The motor includes a motor bracket; a conductive shaft fixed to a front surface side of the motor bracket; a rotor rotatably supported on the shaft; a stator fixed to the front surface side of the motor bracket inside the rotor and wound with a plurality of coils for generating a magnetic field to rotate the rotor; a substrate, a front surface thereof mounted with a driver circuit for controlling magnetic field generation by the coils; and a driver case fixed to a rear surface side of the motor bracket and forming an accommodation space accommodating the substrate between itself and the motor bracket. A positive wiring of the driver circuit is mounted outside a region on the substrate overlapping the shaft when the motor is viewed from an axial direction of the shaft.

Abstract: The motor includes a shaft fixed to a front surface side of a motor bracket; a rotor rotatably supported on the shaft; a stator wound with coils for generating a magnetic field to rotate the rotor; a substrate, a front surface of which mounted with a driver circuit for controlling magnetic field generation by the coils; a conductive driver case forming an accommodation space accommodating the substrate between itself and the motor bracket; a terminal disposed on a front surface side of the substrate facing the motor bracket and connecting the driver circuit and the coils; a conductive fixing member penetrating the substrate from a rear surface side and fixing the terminal in contact with the substrate; and an insulating driver insulator disposed on a rear surface side of the substrate to surround the fixing member, and protruding to a position closer to the driver case than the fixing member.

Abstract: A thermoelectric conversion element (100) of the present invention includes a first electrode (105) which has one side joined to a first surface (101a) of an n-type semiconductor via an n-side junction layer (102), and the other side joined to a first surface (103a) of a p-type semiconductor via a p-side junction layer (104), and a second electrode (106) which is joined to each of a second surface (101b) of the n-type semiconductor and a second surface (103b) of the p-type semiconductor via the n-side junction layer (102) and the p-side junction layer (104). Each of the n-type semiconductor (101) and the p-type semiconductor (103) has a composition represented by Formulas (1) and (2) below, and the n-side junction layer (102) and the p-side junction layer (104) include Al. Mg2SiaSn1-a+A??(1) MgmSixSnyGez+B??(2).

Abstract: An insulator, a stator, and an electric motor capable of improving molding accuracy and assemblability are provided. An insulator 26 includes a first insulator 61 and a second insulator 62 to be attached from both axial sides of a stator core. The first insulator 61 has a first core end surface covering portion 65 and a first skirt portion 79. The second insulator 62 has a second core end surface covering portion 265 and a second skirt portion 279. The insulator 26 includes a coil lead-out portion 77 provided integrally with only the first core end surface covering portion 65 for leading out terminal portions of coils from the first insulator 61 to the outside. A length of the longest portion of the second skirt portion 279 in the axial direction is greater than a length of the longest portion of the first skirt portion 79 in the axial direction.

Abstract: The present invention has a main holder 40 that is coupled to a wiper arm, a vertebra 22 that is held by the main holder 40 and curves with a prescribed curvature, and a blade rubber 30 that is held by the vertebra 22 and makes contact with a front glass 11, wherein the main holder 40 comprises a first claw part 46 and a second claw part 47 that hold the vertebra 22 with a gap in the lengthwise direction thereof, and a supporting protrusion 49 that is provided between the first claw part 46 and the second claw part 47, and protrudes toward the vertebra 22, and the vertebra 22 comprises an elongated hole 22a in which the supporting protrusion 49 is engaged.

Abstract: A motor includes a busbar terminal including a plurality of layers overlapping in an axial direction. In the busbar terminal, an external connection terminal and a coil connection terminal are formed. A coil terminal part that is pulled out from a winding part overlapping the external connection terminal in the axial direction is connected to the coil connection terminal while being subjected to forming to be pulled out in a circumferential direction.

Abstract: A fifth ball bearing that rotatably supports a rotating shaft is provided on one side of a pinion gear in an axial direction of the rotating shaft. A sixth ball bearing that rotatably supports the rotating shaft is provided on the other side of the pinion gear in the axial direction of the rotating shaft. A carrier is provided with a bearing fixing portion that supports the fifth ball bearing immovably in the axial direction of the rotating shaft, and a bearing guide portion that supports the sixth ball bearing movably in the axial direction of the rotating shaft. The fifth and sixth ball bearings are provided so as not to be close to each other in the axial direction of the rotating shaft, and a female screw portion has a rattling adjustment member that presses the sixth ball bearing toward the side where the fifth ball bearing is provided.

Abstract: A fifth ball bearing that rotatably supports a rotating shaft is provided on one side of a pinion gear in an axial direction of the rotating shaft. A sixth ball bearing that rotatably supports the rotating shaft is provided on the other side of the pinion gear in the axial direction of the rotating shaft. A carrier is provided with a bearing fixing portion that supports the fifth ball bearing immovably in the axial direction of the rotating shaft, and a bearing guide portion that supports the sixth ball bearing movably in the axial direction of the rotating shaft. The fifth and sixth ball bearings are provided so as not to be close to each other in the axial direction of the rotating shaft, and a female screw portion has a rattling adjustment member that presses the sixth ball bearing toward the side where the fifth ball bearing is provided.

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.

Abstract: A control device includes a control board on which a control circuit for controlling an electric motor is mounted, a housing that supports a surface on a side of the control board in a thickness direction, and a cover attached to the housing to cover a surface on the other side of the control board in the thickness direction and a periphery of the control board. First positioning holes penetrating in the thickness direction are formed in the control board. Second positioning holes respectively corresponding to the first positioning holes are formed in the housing. The cover includes positioning pins that protrude toward the housing and have a tapered shape in which a diameter of a circumscribed circle gradually decreases toward a tip. The positioning pin is inserted into the first positioning hole and the second positioning hole corresponding thereto to position the control board, the housing, and the cover.

Abstract: A motor device includes an electric motor, a control board on which a control circuit controlling the electric motor is mounted, a metal housing supporting a first surface of the control board, a resin cover attached to the housing to cover a second surface of the control board opposite to the first surface and the periphery of the control board, and a heat dissipation member dissipating heat generated by a heating element included in the control circuit to the housing. The heat dissipation member includes a heat reception plate fixed to the cover, and a heat transfer plate protruding toward the housing. The housing includes, outside the motor accommodation space, a reception portion receiving a protrusion end of the heat transfer plate inserted in a direction in which a rotation shaft extends, and a heat exhaust wall extending in the and coming into surface contact with the heat transfer plate.

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.

Abstract: Provided is a motor including a stator and a rotor. The rotor includes a rotor core rotating integrally with an rotation shaft and having a core base end part fixed to the rotation shaft and core protrusions protruding outward in a radial direction from the core base end part; and a magnet disposed between the core protrusions adjacent to each other in a circumferential direction on an outer peripheral surface of the core base end part. A central position of the stator core in the axial direction, a central position of the rotor core in the axial direction, and a central position of the magnet in the axial direction are deviated from each other. The central position of the magnet in the axial direction is located between the central position of the stator core in the axial direction and the central position of the rotor core in the axial direction.