Umeda, Japan
Umeda, Japan

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Patent
Asmo Co. | Date: 2016-10-14

A brushless motor includes a first rotor core, a second rotor core, and a field magnet member. The first rotor core includes primary projecting pieces arranged along a circumferential direction at equal intervals. The second rotor core has the same shape as the first rotor core, and includes secondary projecting pieces arranged along the circumferential direction at equal intervals. The secondary projecting pieces are positioned between the primary projecting pieces that are adjacent to one another in the circumferential direction. The field magnet member is arranged between the first rotor core and the second rotor core. The field magnet member is magnetized along an axial direction to generate primary magnetic poles in the primary projecting pieces, and generate secondary magnetic poles in the secondary projecting pieces. A rotor includes the first rotor core, the second rotor core, and the field magnet member.


Patent
Asmo Co. | Date: 2016-10-14

A brushless motor includes a first rotor core, a second rotor core, and a field magnet member. The first rotor core includes primary projecting pieces arranged along a circumferential direction at equal intervals. The second rotor core has the same shape as the first rotor core, and includes secondary projecting pieces arranged along the circumferential direction at equal intervals. The secondary projecting pieces are positioned between the primary projecting pieces that are adjacent to one another in the circumferential direction. The field magnet member is arranged between the first rotor core and the second rotor core. The field magnet member is magnetized along an axial direction to generate primary magnetic poles in the primary projecting pieces, and generate secondary magnetic poles in the secondary projecting pieces. A rotor includes the first rotor core, the second rotor core, and the field magnet member.


In a stator, winding coil sections are formed at respective teeth, and pairs of winding terminal portions that are continuous to the respective winding coil sections are guided out from between base end portions of respective adjacent teeth toward one axial direction side of the stator core. A first retaining portion that retains a base end portion of one winding terminal portion of each pair of winding terminal portions, and a second retaining portion that retains another winding terminal portion of each pair of winding terminal portions, are provided between the base end portions of the respective adjacent teeth. The first retaining portions and the second retaining portions are disposed between the base end portions of the respective adjacent teeth so as to be offset from each other in a circumferential direction and a radial direction of the stator core.


Patent
Denso Corporation and Asmo Co. | Date: 2016-09-30

A drive device includes a shaft rotatably supported by a first bearing and a second bearing. The first bearing is disposed in a shaft hole of an output frame end. The second bearing is disposed in a bearing box of an opposite-to-output frame end. An oil seal is fixed in the shaft hole and is closer to an output end than the first bearing is, and is in sliding contact with an outer circumference of the shaft. A biasing member is housed in the bearing box and biases an outer race of the second bearing toward the output end. Accordingly, a deflection amount and a bend amount of the shaft at the location where the oil seal is disposed may be reduced.


Patent
Asmo Co. | Date: 2017-01-31

A stator includes: plural core configuration sections each including plural yoke configuration sections that configure a ring shaped yoke and are segmented in a yoke circumferential direction and plural teeth sections that project from the respective yoke configuration sections along a yoke radial direction, with the plural yoke configuration sections and the plural teeth sections integrated together; plural coil wires that are wound onto the respective teeth sections to configure plural winding portions; and plural insulators that each include plural insulator portions that are integrated to each of the respective core configuration sections and insulate between the teeth sections and the winding portions, and a connection portion that connects together the plural insulator portions.


A rotor includes a rotor core, permanent magnets, and a tubular non-magnetic cover. The permanent magnets are arranged along an outer surface of the rotor core in the circumferential direction. The permanent magnets each include a curved outer surface as viewed in the axial direction. The tubular non-magnetic cover covers the outer surfaces of the permanent magnets. The rotor core includes at least two stacked cores. Each stacked core includes a stack of core sheets. One of the stacked cores is formed from a material having a lower hardness than the other stacked core.


Patent
Asmo Co. | Date: 2017-02-06

A brushed motor includes a rotation shaft, a commutator including a plurality of segments separated by a plurality of undercuts arranged at unequal intervals, an armature, a plurality of permanent magnets, a voltage equalizing line, a positive electrode brush, and a negative electrode brush. When Pz is the number of the permanent magnets and N is the number of the segments, a relationship of N=Pz(K0.5) is satisfied. Pz is an even number that is greater than or equal to four. K is a constant and is a natural number that is greater than or equal to two. The plurality of undercuts includes at least one set of undercuts arranged at an undercut interval that differs from a reference angle z. The reference angle z is specified by a relational expression of z=(360 degrees/Pz)(360 degrees/2N).


A brushless motor comprising: a rotor; a stator core disposed at a radial direction outside of the rotor, and a stator case. The stator core includes an outer ring shaped section, teeth sections projecting out from the outer ring shaped section toward a radial direction inside, and an inner ring shaped section extending from end portions of the teeth sections. Protruding portions are formed at the outer ring shaped section so as to project toward a radial direction outside and so as to be disposed at even intervals around a circumferential direction of the outer ring shaped section. The stator case is integrated together with the stator core by a plurality of plastic deformation portions formed at an outer peripheral portion of the stator case at locations facing towards the protruding portions, and the plastic deformation portions are disposed at even intervals along a circumferential direction of the stator case.


Patent
Asmo Co. | Date: 2016-06-28

A clutch transmits rotation drive force of a rotation shaft to a driven shaft and restricts transmission of a rotation force from the driven shaft to the rotation shaft. The clutch includes a grease accommodation portion and a rotation member. Grease is arranged in the grease accommodation portion. The grease accommodation portion opens in an axial direction of the rotation shaft. The rotation member is at least partially inserted into the grease accommodation portion and rotated with the rotation shaft about a center axis of the rotation shaft. The rotation member includes a leakage restriction wall that is located toward a radially outer side of the rotation shaft from the opening of the grease accommodation portion and extended in the axial direction of the rotation shaft. The leakage restriction wall is located toward an outer side of the grease accommodation portion from the opening of the grease accommodation portion.


An armature manufacturing method includes preparing a core member that includes a rotation shaft at a central portion and that is formed with plural teeth in a radiating shape centered on the rotation shaft; and winding winding wires onto slots between the plural teeth so as to form plural types of winding coil sections, each with a different winding wire diameter.

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