Abstract: A resolver-to-digital converter circuit for performing signal processing on a resolver sensor including a SIN exciting coil, a COS exciting coil, and a detecting coil includes: a control device configured to generate excitation signals for the SIN and COS exciting coils; an excitation waveform generating unit configured to generate excitation waveforms for the SIN and COS exciting coils from the corresponding excitation signals; and a detecting unit configured to generate a signal indicating the angle of rotation of the resolver sensor based on a detection signal outputted from the detecting coil. The control device has: a waveform generating unit configured to perform ?? modulation to generate PDM waveforms; a first waveform memory configured to store a PDM waveform corresponding to the excitation signal for the SIN exciting coil; and a second waveform memory configured to store a PDM waveform corresponding to the excitation signal for the COS exciting coil.

Abstract: An outer rotor brushless motor includes: a shaft; a rotor; a stator; a tubular bushing at one side of the stator; an impregnated bearing at the other side of the bushing; and a washer rotatable integrally with the shaft. The bushing has: a fixed portion fixed to a core inner peripheral surface, the fixed portion having a first end surface facing a bearing end surface, and a first inner peripheral surface facing an outer peripheral surface with first clearance in between; and a housing having a second inner peripheral surface with a greater diameter than the first inner peripheral surface, on the one side of the fixed portion. An oil repellent finish is applied to a surface of the bushing. The washer is placed radially inward of the second inner peripheral surface. Second clearance greater than the first clearance is between the bearing end surface and the first end surface.

Abstract: A turbo fan, formed by ultrasonic welding, a first component including: a flat portion; and plate-shaped blade portions standing from the flat portion, and a second component having recessed groove portions in each of which an end portion of the respective blade portion fits. The groove portions have a groove width greater than a thickness of the end portions of the blade portions. The turbo fan includes a group of positioning ribs partially burying two clearances created on two sides of the end portion in a thickness direction thereof, respectively, in a pre-welding state. The group of positioning ribs protrude in the thickness direction from the end portion of at least one of the blade portions, or from side surfaces of at least one of the groove portions, and are in contact with side surfaces of the groove portion, or in contact with the end portion of the blade portion.

Abstract: A resolver includes a first transformer coil provided on a first board of a stator, and a second transformer coil provided on a second board of a rotor. The first board is provided with electric elements placed around a rotary shaft and inward of the first transformer coil, and signal wires of the electric elements. The first transformer coil includes an arc-shaped first outer portion and a first inner portion that are provided with a first air gap therebetween. The second transformer coil includes a ring-shaped second outer portion and a second inner portion that are provided with a second air gap therebetween. The first air gap and the second air gap are provided, facing each other in a rotary shaft direction. The signal wires are routed in an opening region in which the first outer portion and the first inner portion are not present, in a ring-shaped region in which the first transformer coil is extended.

Abstract: A motor includes a rotor configured to rotate integrally with a shaft; a stator placed radially outward of the shaft and radially inward of the rotor; and a tubular bushing that is fixed to one end side of the stator and through which the shaft is inserted. The stator includes: a stator core having a tube portion through which the shaft is inserted, and a plurality of tooth portions protruding radially outward from the tube portion; a plurality of coils formed by winding a winding around each of the plurality of tooth portions; and an insulating layer formed by applying an insulating coating to the tooth portions around which the winding is wound. The bushing includes: a fixed portion to be fixed to an inner peripheral surface of the tube portion; and a guide portion that extends axially outward of an end surface of the stator core from the fixed portion and with which a crossover wire (Wc) connecting between the plurality of coils comes into contact.

Abstract: A motor unit for transmitting a driving force of a motor driven by a battery to an opening and closing mechanism through a worm gear and a worm wheel includes lubricating grease. The grease includes a solid additive that increases a friction coefficient between the worm gear and the worm wheel as its addition amount increases. The addition amount is not less than a first threshold and is not more than a second threshold. The first threshold is an addition amount for realizing a friction coefficient at which transmission efficiency from the worm wheel to the worm gear becomes 0 [%]. The second threshold is an addition amount for realizing a friction coefficient at which a starting voltage of the motor to move the opening and closing mechanism in an opening direction becomes a minimum guaranteed voltage of the battery after the opening and closing mechanism is restrained fully closed.

Abstract: A resolver includes an excitation coil provided at the rotor or the stator and formed on a sheet-shaped substrate, and a detection coil provided at the rotor or the stator and formed on the sheet-shaped substrate. At least one of the excitation coil and the detection coil is a sine coil and a cosine coil. In the sine coil, sine coil patterns of a pair of comb-shaped closed coils are disposed on the identical layer of the substrate. In the cosine coil, cosine coil patterns of a pair of comb-shaped closed coils are disposed on the identical layer of the substrate. Each of the pair of comb-shaped closed coils includes a first comb-shaped closed coil including an inward first projection and a second comb-shaped closed coil including an outward second projection.

Abstract: A resolver includes: a sine exciting coil and a cosine exciting coil; a detecting coil that is provided to a rotor and is placed facing the sine exciting coil and the cosine exciting coil; an exciting coil forming a closed circuit, together with the detecting coil, in the rotor; and a sine detecting coil and a cosine detecting coil that are provided to a stator, are placed facing the exciting coil, and transmit alternating current signals that are 90 electrical degrees apart in phase. The multiplication factor of angle of the sine detecting coil, the cosine detecting coil, and the exciting coil is different from the multiplication factor of angle of the sine exciting coil, the cosine exciting coil, and the detecting coil.

Abstract: A columnar core main body including a plurality of laminated cores having the same shape and that has a shaft hole on a rotation center side, a plurality of permanent magnets penetrate around the shaft hole of the core main body in an axial direction and is fixed in each of a plurality of magnet accommodating holes arranged in a circular shape in a circumferential direction, and protrusions in the magnet accommodating holes in one-to-one correspondence. The protrusion protrudes along the circumferential direction and comes into pressure contact with the permanent magnet accommodated in the magnet accommodating hole from the radially inner side. Each of the protrusions is defined by a protrusion forming space extending along the circumferential direction from a radially inner side surface of each magnet accommodating hole, and at least one of the protrusion and the protrusion forming space is on the magnetic pole center.

Abstract: A rotor includes a cylindrical core main body having a columnar space on a rotation center side. A plurality of magnet accommodating hole pair penetrates the core main body in an axial direction and includes a pair of magnets accommodating holes arranged in a V shape so as to be separated from each other toward one side of the core main body which is a stator side in a radial direction. A plurality of permanent magnets is fixed in the respective magnet accommodating holes. The plurality of permanent magnets come into pressure contact with the permanent magnet from the q-axis side and the other side in the radial direction. A protrusion forming space penetrates in the axial direction and extending from a side surface to the one side in the radial direction along the side surface.

Abstract: A resolver includes a sine coil and a cosine coil that transmit AC signals having phases of the electrical angle different from each other by 90 degrees in one of a sheet-like excitation coil and a sheet-like detection coil disposed at a rotor or a stator, and a counter coil or a conductor disposed to face the sine coil and the cosine coil in the other of the excitation coil and the detection coil. In addition, an area (S) of a portion where each of the sine coil and the cosine coil and the counter coil or the conductor overlap each other when viewed in the axial direction of the resolver changes into a sinusoidal shape as the rotor rotates.

Abstract: A resolver includes a first coil group and a second coil group. The first coil group has a first exciting coil and a first detecting coil that have a multiplication factor of angle of nX (where n is a natural number equal to or greater than three), are placed coaxially with the axis of rotation of the rotor, and each have a ring shape. The second coil group has a second exciting coil and a second detecting coil that have a multiplication factor of angle of (n?1)×, are placed coaxially with the axis of rotation of the rotor, and each have a ring shape. Furthermore, the first coil group and the second coil group are provided at positions different in a radial direction from each other.

Abstract: A bearing unit includes: a thrust damper extendable in an axial direction of a shaft placed in a gearbox, the movement of which toward one side in the axial direction is regulated; a shaft receiver component held by the thrust damper on the other side of the thrust damper in the axial direction; a metal holder that holds the shaft receiver component in such a manner as to be detachable in the axial direction; and an oilless metal held by the metal holder and placed on the other side of the shaft receiver component, in which the thrust damper, the shaft receiver component, the metal holder, and the oilless metal are integrated all together before being incorporated into the gearbox.

Abstract: A brush motor includes: a rotor core provided in a rotor; s teeth provided in the rotor core; s concentrated-winding coils with electric wires being respectively wound around the teeth; a commutator provided on the rotor in a relatively non-rotatable manner; c commutator pieces provided in the commutator and connected to the coils; p pairs of magnet magnetic poles provided on a stator and arranged to face the teeth; and a brush that is brought into sliding contact with the commutator pieces to supply a current to the coils, in which 0.5<p/s<1 and s<c.

Abstract: A rotor applied to an inner rotor brushless motor includes: a rotor core having a laminate of a plurality of annular thin plate-shaped core pieces, the rotor core being configured to rotate together with a shaft in an integrated manner; a cylindrical resin magnet mounted on an outer peripheral surface of the rotor core via a gap; a groove-shaped adhesive admission portion in a straight line along the entire length of the rotor core in an axial direction thereof, the adhesive admission portion being recessed into the outer peripheral surface of the rotor core; and an adhesive configured to bond and fix the rotor core and the magnet. The adhesive is filled in an entire adhesive allowance having both of the gap and the adhesive admission portion between the outer peripheral surface of the rotor core and an inner peripheral surface of the magnet.

Abstract: To provide a brushless motor with a simple configuration, which has accomplished size reduction. An inner rotor brushless motor having a rotor in a center of a cylindrical stator includes: three bus bars on one end side of the stator in an axial direction thereof, the bus bars connecting three phase coils provided to the stator on a phase-by-phase basis; a bottomed tubular connector portion adjacent to a housing that houses the stator and the rotor; a plurality of connector terminals fixed, penetrating a bottom portion of the connector portion, the plurality of connector terminals being exposed to an internal space of the connector portion; and a board stretching from the one end side of the stator in the axial direction to the bottom portion side of the connector portion, the board being configured to electrically connect an end of each of the bus bars and the penetrating connector terminal.

Abstract: A reduction gear configured to decelerate and output rotation of a motor includes two-stage planetary gear mechanisms that are provided side by side in an axial direction of the motor and are each configured of helical gears, and a case made of resin and formed into a cylindrical shape, the case incorporating the two-stage planetary gear mechanisms. At least one of an inner engagement ratio of a sun gear and a pinion gear of the planetary gear mechanism in a first stage and an outer engagement ratio of the pinion gear and a ring gear of the planetary gear mechanism in the first stage is 3.0 or more, and both the inner engagement ratio and the outer engagement ratio are larger than an engagement ratio of the planetary gear mechanism in a second stage.

Abstract: A reduction gear configured to decelerate and output rotation of a motor by two-stage planetary gear mechanisms disposed side by side in an axial direction includes: a case made of resin, the case being formed into a cylindrical shape in which the two-stage planetary gear mechanisms are incorporated, and having at least one of a lid portion and a bottom portion provided at each of both axial ends; and a reinforcing component that is formed of a material having a Young's modulus higher than a Young's modulus of a material of the case. The reinforcing component extends along at least a part of an inner peripheral surface in an axial central portion of the case.

Abstract: A motor includes a case; and a partition that is fitted into the case and has an easily deformable part formed on an outer peripheral surface for dispersing and dissipating vibration transmitted between the case and the partition. A space is formed in the easily deformable part.

Abstract: A worm wheel is installed inside a wheel accommodation chamber of a body casing; a motor is fastened by screws from the right side perpendicular to the axis line of the worm wheel, thus forming a motor fastening part; and a worm fixed to an output shaft of the motor is engaged with the worm wheel. A board accommodation chamber is formed so as to be adjacent to the right of the wheel accommodation chamber, and a control board is inserted inside the board accommodation chamber from below. The control board is disposed so as to be inclined in a direction in which the upper end of the control board is displaced toward the wheel accommodation chamber from an erect attitude perpendicular to the axis line of the output shaft of the motor, and thus the upper end is separated from the motor fastening part in the direction of the axis line of the output shaft.