Abstract: Provided is a rotating electric machine, including: a stator including: an annular core back; and a plurality of teeth projecting in a radial direction from the core back and being arranged in a circumferential direction, the plurality of teeth having slots each formed between the plurality of teeth adjacent to each other in the circumferential direction; and a rotor including: an annular rotor core which is arranged coaxially with the stator through a magnetic gap; and a plurality of magnetic poles arranged on the rotor core in the circumferential direction, wherein the rotor core includes a plurality of segment cores formed by dividing the rotor core in the circumferential direction with at division surfaces, and wherein the number of segments of the rotor core is different from a divisor and a multiple of the greatest common divisor of the number of poles of the rotor and the number of slots.

Abstract: A sensor core (8) is arranged in a plane (P1), which is positioned on sides of opposite ends of plungers (5a, 5b) from bosses (6a, 6b), and which is perpendicular to a direction of movement of the plungers (5a, 5b). A magnetic sensor (9) is arranged at a position in the plane (P1), the position being apart from a magnetic path (A3) of a leakage flux of a magnetic circuit (A).

Abstract: Provided is a rotor for a permanent magnet rotary electric machine, which enables the bonding of a permanent magnet to a rotor core in a skewed manner with respect to an axial direction of the rotor core. The rotor includes a rotor core including a cylindrical portion and a pair of polygonal columnar portions provided to both ends of the cylindrical portion in the axial direction, and a permanent magnet having a bonding surface, which is flat and bonded to the rotor core. The pair of polygonal columnar portions has flat surfaces that are arranged so that center positions are spaced apart from each other as viewed in the axial direction. The bonding surface of the permanent magnet is bonded to the respective flat surfaces of the pair of polygonal columnar portions under a state in which the permanent magnet is skewed with respect to the axial direction.

Abstract: Provided is a rotor for a permanent magnet rotary electric machine, which enables the bonding of a permanent magnet to a rotor core in a skewed manner with respect to an axial direction of the rotor core. The rotor includes a rotor core including a cylindrical portion and a pair of polygonal colmnar portions provided to both ends of the cylindrical portion in the axial direction, and a permanent magnet having a bonding surface, which is flat and bonded to the rotor core. The pair of polygonal columnar portions has flat surfaces that are arranged so that center positions are spaced apart from each other as viewed in the axial direction. The bonding surface of the permanent magnet is bonded to the respective flat surfaces of the pair of polygonal columnar portions under a state in which the permanent magnet is skewed with respect to the axial direction.

Abstract: Magnets are disposed between adjacent first claw portions and second claw portions so as to protrude toward a second end in an axial direction from tips of the first claw portions and so as to protrude toward a first end in the axial direction from tips of the second claw portions, magnet holding members include a base portion that covers a radially outer surface of the magnets, and the base portion includes a high magnetic resistance portion that is disposed in a direction that is perpendicular to a direction from the first claw portions toward the second claw portions and parallel to the radially outer surface of the magnets so as to cross a magnetic path from the first claw portions toward the second claw portions in a region between the adjacent first claw portions and second claw portions.

Abstract: Provided is a rotating electric machine, including: a stator including: an annular core back; and a plurality of teeth projecting in a radial direction from the core back and being arranged in a circumferential direction, the plurality of teeth having slots each formed between the plurality of teeth adjacent to each other in the circumferential direction; and a rotor including: an annular rotor core which is arranged coaxially with the stator through a magnetic gap; and a plurality of magnetic poles arranged on the rotor core in the circumferential direction, wherein the rotor core includes a plurality of segment cores formed by dividing the rotor core in the circumferential direction with at division surfaces, and wherein the number of segments of the rotor core is different from a divisor and a multiple of the greatest common divisor of the number of poles of the rotor and the number of slots.

Abstract: Magnets are disposed between adjacent first claw portions and second claw portions so as to protrude toward a second end in an axial direction from tips of the first claw portions and so as to protrude toward a first end in the axial direction from tips of the second claw portions, magnet holding members include a base portion that covers a radially outer surface of the magnets, and the base portion includes a high magnetic resistance portion that is disposed in a direction that is perpendicular to a direction from the first claw portions toward the second claw portions and parallel to the radially outer surface of the magnets so as to cross a magnetic path from the first claw portions toward the second claw portions in a region between the adjacent first claw portions and second claw portions.

Abstract: A sensor core (8) is arranged in a plane (P1), which is positioned on sides of opposite ends of plungers (5a, 5b) from bosses (6a, 6b), and which is perpendicular to a direction of movement of the plungers (5a, 5b). A magnetic sensor (9) is arranged at a position in the plane (P1), the position being apart from a magnetic path (A3) of a leakage flux of a magnetic circuit (A).

Abstract: A motor includes a shaft, a rotor magnet, an armature, an upper bracket, a lower bracket, and a fixing member. An insulator includes magnetic pole tooth insulating portions, each of which covers a separate one of magnetic pole teeth, and a core back insulating portion configured to cover at least portions of upper and lower end surfaces of a core back. A stator core includes a fixing member arranging portion. The core back insulating portion includes a core back insulating projecting portion configured to project in an axial direction away from a surface covering the core back, and including a radially inner surface located radially inward of a radially inner end of the fixing member arranging portion. The core back insulating projecting portion includes a cut portion at a position radially opposed to the fixing member.

Abstract: A motor includes a shaft, a rotor magnet, an armature, an upper bracket, a lower bracket, and a fixing member. An insulator includes magnetic pole tooth insulating portions, each of which covers a separate one of magnetic pole teeth, and a core back insulating portion configured to cover at least portions of upper and lower end surfaces of a core back. A stator core includes a fixing member arranging portion. The core back insulating portion includes a core back insulating projecting portion configured to project in an axial direction away from a surface covering the core back, and including a radially inner surface located radially inward of a radially inner end of the fixing member arranging portion. The core back insulating projecting portion includes a cut portion at a position radially opposed to the fixing member.

Abstract: In a brushless motor for use in a disk drive, a rotor is mounted onto a tube portion of a housing. A retaining claw is formed at an upper end of the tube portion. A turntable has a central concave portion which accommodates an upper portion of the tube portion of the housing. A retaining member is provided radially outside the central concave portion, and includes a plurality of retaining pieces extending to the inside of the central concave portion. When the rotor is mounted onto the housing, the retaining pieces come into contact with the retaining claw and then move upward. When the rotor moves upward relative to the housing, the retaining pieces come into contact with the retaining claw, thereby restricting upward movement of the rotor. Upward movement of the retaining pieces is restricted by contact between the retaining member and the turntable.

Abstract: A chucking mechanism is operable to detachably set thereon a discoid disk. The chucking mechanism includes a center case, a claw member, an elastic member, and a turn table. The claw member includes, a claw portion, and a movement support portion The center case includes a movement pivot receiving portion. A support point extending continuously from the movement pivot portion is arranged radially inwardly of the movement pivot portion at the movement support portion, and axially upward movement of the tip portion is substantially prevented since the support point makes contact with the movement pivot receiving portion, and a top surface of the movement support portion makes contact with a bottom surface of the top plate portion.

Abstract: A claw member includes at a radially inward surface thereof a protrusion inclined surface in order to minimize deformation occurring in an axial direction to an elastic member which is a coil spring. The protrusion inclined surface is preferably inclined, when a tip portion of the claw member is at an axially lowest point, to be substantially perpendicular to the central axis, or such that the further radially inward a portion thereof is the axially lower the portion is. By virtue of such configuration, the protrusion inclined surface minimizes deformation occurring to the elastic member in the axial direction.

Abstract: A motor used for a data storage disk drive is provided. The motor includes a rotor holder having a cylindrical portion. The cylindrical portion has a radially inner surface defining a through hole and an inner protruding section arranged at an axial end portion of the radially inner surface. The inner protruding section radially inwardly protrudes from the radially inner surface into the through hole. A shaft of the motor is inserted into the through hole and fixed to the radially inner surface of the cylindrical portion of the rotor holder with an adhesive. In the motor, a radially inner end of the inner protruding section of the rotor holder radially opposes an axially upper portion of the shaft. In addition, the portion of the axially lower surface of the inner protruding section of the rotor holder axially opposes the shaft while the axially upper portion of the shaft and the inner protruding portion are arranged in an axially vicinity manner.

Abstract: A movement pivot receiving portion which receives a movement pivot portion of a claw member and a movement support receiving portion which receives a movement assist portion of the claw member are arranged radially within a cylindrical portion of a center case. By virtue of such configuration, both receiving portions are designed with a greater degree of freedom within a space between an inner circumferential surface of the cylindrical portion and an outer circumferential surface of a base portion. Therefore, the claw member may be designed to have a preferable thickness while achieving a preferable movement of in an axial direction.

Abstract: In a brushless motor for use in a disk drive, a rotor is mounted onto a tube portion of a housing. A retaining claw is formed at an upper end of the tube portion. A turntable has a central concave portion which accommodates an upper portion of the tube portion of the housing. A retaining member is provided radially outside the central concave portion, and includes a plurality of retaining pieces extending to the inside of the central concave portion. When the rotor is mounted onto the housing, the retaining pieces come into contact with the retaining claw and then move upward. When the rotor moves upward relative to the housing, the retaining pieces come into contact with the retaining claw, thereby restricting upward movement of the rotor. Upward movement of the retaining pieces is restricted by contact between the retaining member and the turntable.

Abstract: A claw member includes a claw portion and a movement support portion. The movement support portion includes a movement pivot portion which is a pivotal portion of the movement of the claw member, and a movement support portion formed radially inward of the movement pivot portion. The claw member is allowed to maintain an axial height of a tip portion thereof while smoothly maintaining a movement in a radially inward direction thereof since a movement support receiving portion and the movement support portion make contact with one another.

Abstract: In a brushless motor for use in a disk drive, a rotor is mounted onto a tube portion of a housing. A retaining claw is formed at an upper end of the tube portion. A turntable has a central concave portion which accommodates an upper portion of the tube portion of the housing. A retaining member is provided radially outside the central concave portion, and includes a plurality of retaining pieces extending to the inside of the central concave portion. When the rotor is mounted onto the housing, the retaining pieces come into contact with the retaining claw and then move upward. When the rotor moves upward relative to the housing, the retaining pieces come into contact with the retaining claw, thereby restricting upward movement of the rotor. Upward movement of the retaining pieces is restricted by contact between the retaining member and the turntable.

Abstract: A tip portion of a claw member is, when the same is at a lowest position, axially above a bottom surface of an upper disk base of a multi-layered disk. By virtue of such configuration, the tip portion will not be caught between the upper disk base and a lower disk base of the multi-layered disk.

Abstract: A motor includes a chucking device for detachably holding a disk-shaped storage medium. The chucking device includes a plurality of radially outwardly biased claw members. Further, the claw members make contact with a top surface of a cover portion of a turntable when the claw members are in contact with the top edge of a central opening of the storage medium. At least one of the claw member's contact sections and the turntable's contact section is made of a material different than a material forming the remaining sections of the claw members and the remaining section of the turntable so that the static friction coefficient between the claw member's contact sections and the turntable's contact section becomes greater than the static friction coefficient between the claw members and the rest portions.