Abstract: The generator comprises a stator (10) having a plurality of protruding portions for stator pole (12) on the outer peripheral surface of the stator main unit (11), and a rotor (20) having a plurality of protruding portions for rotor (22) mounted around the stator (10) in a rotatable state. Since the height of the plurality of protruding portions for stator pole (12) decreases along the rotational or reverse rotational direction of the rotor (20), a torque waveform containing odd-order components is generated when the rotor (20) is rotated coaxially around the stator (10). The plurality of protruding portions for stator pole (12) comprises a first protrusion group for stator pole (12A) and a second protrusion group for stator pole (12B), and the first protrusion group for stator pole (12A) and the second protrusion group for stator pole (12B) are formed with the protruding portions for stator pole (12) laid out along the circumferential direction spaced apart from each other.

Abstract: An axial flux electric machine comprises a rotor assembly configured to rotate about an axis of rotation. A stator core is coupled to the rotor assembly. The stator core comprises a stator core base and a plurality of circumferentially-spaced stator teeth extending from the base in a direction parallel to the axis. Each stator tooth of the plurality of stator teeth comprises a top surface, a pair of opposing circumferential sides, and a chamfered portion defined at an intersection of the top surface and each of the pair of opposing sides. The chamfered portion facilitates reducing an amount of torque ripple produced by the axial flux electric motor.

Abstract: A brushless synchronous motor includes a rotor having a number n of embedded permanent magnets and being rotatable relative to a stator having a number of stator teeth provided with a three-phase stator winding, while forming an air gap. An angle between two adjacent permanent magnets is 360°/n where n>8, an angle between two adjacent stator teeth is 360°/n+2, and an inner contour of the stator facing the rotor has a curved structure with curvature valleys provided at ends of the stator teeth.

Abstract: A stator for an electric rotating machine includes a stator core that has slots, a stator coil, and an impregnant applied to the inner surface of the stator core. The stator core has a plurality of teeth that divide the slots. Teeth having chamfered surfaces between a projected tip surface and each side surface of the teeth and teeth without chamfered surfaces are intermingled. At least one bent corner part formed at an end of the projected tip surface of the teeth is formed in an arcuate surface. A relationship (R1>R2) is satisfied, where R1 represents a curvature radius of arcuate surfaces formed in the curved corner part where the projected tip surface and the chamfered surface abut and R2 represents a curvature radius of the arcuate surfaces formed in the curved corner part where the projected tip surface and the side surface abut.

Abstract: A stator core includes a cylindrical yoke and teeth that are disposed in an inner circumference surface of the yoke along its circumferential direction and that are subjected to magnetic flux from the rotor of the rotating electrical device. The teeth include a trapezoidal tooth that has a trapezoidal cross section that is taken vertically along a central axis of the yoke and an oddly shaped tooth of which a tip section has the same shape as the trapezoidal tooth and a base section from the tip section to the yoke has a different shape from the trapezoidal tooth.

Abstract: An accommodating recess (21A, 21B) has a magnet accommodating portion (19A, 19B) for accommodating a permanent magnet (17A, 17B) and a cavity (20A, 20B), which is located at the q-axis side of the magnet accommodating portion. The cavity opens through a rotor outer circumferential surface (162). A starting point (Pa1, Pb1) of an outer cavity forming surface (201A, 201B) is located on the rotor outer circumferential surface. The outer cavity forming surface intersects either a magnetic pole surface or an imaginary extended plane (23A, 23B) of a magnetic pole facing surface (191A, 191B). The rotor outer circumferential surface (162) includes portions of an imaginary annular line (E). A starting point (Pa1, Pb1) of the outer cavity forming surface (201A, 201B) is located between the d-axis and an intersection point (Qa, Qb) between the imaginary annular line and the imaginary extended plan of the magnetic pole facing surface.

Abstract: An electric machine includes a stator and a rotor configured to rotate about an axis of rotation in a direction of angular rotation. The rotor includes a first claw-pole segment and an opposing second claw-pole segment. The first claw-pole segment includes a plurality of fingers extending from an end ring. Each finger includes a distal end and a proximal end with the proximal end fixed to the end ring. Each finger also includes an interior side and an exterior side with the exterior side facing the stator. A leading side and a trailing side are defined on each finger by the direction of angular rotation. A chamfer is formed on the exterior trailing side of each finger at the proximal end of the finger.

Abstract: A flux-switching machine stator comprising two or more C-cores, each C-core having two legs and a back portion joining the legs, and a permanent magnet arranged between legs of adjacent C-cores. Each leg has a main portion and a tip portion further from the back portion characterized in that the tip portion of each leg is angled relative to the main portion of the respective leg.

Abstract: A motor comprises a stator having a plurality of magnetic poles disposed at first predetermined intervals along an outer periphery thereof, and a rotor having a permanent magnet with poles magnetized alternately to have different polarities at second predetermined intervals and disposed rotatably around the outer periphery of the stator with a predetermined gap. The magnetic poles of the stator has extended portions formed in a manner to extend from magnetic polar bases into a direction generally parallel to the permanent magnet, and the extended portions are formed of a high-permeability magnetic steel sheet with silicon content less than 3.0 wt-%.

Abstract: A specific force capacity thrust bearing and a method for producing such a design for a particular application are disclosed. The magnetic flux density in the stator material is maximized by varying cross-sectional area normal to the flux path. After a set of initial parameters are chosen, the design can be improved upon by changing the design variables and then verifying the force capacity using a finite element program. By linking the finite element program to a model of the geometry and using some basic algorithms, it is possible to automatically iterate until an optimal design is reached. The resulting design has a much higher force capacity than designs typical of the prior art.

Abstract: An inner-rotor-type motor includes a casing, a shaft and a claw-pole member. The shaft is rotatably coupled to the casing, and coupled to a permanent magnet having a magnetism-inducing surface. The claw-pole member is coupled within the casing and has an annular portion and a plurality of salient-poles. The annular portion has an inner circumferential wall. Each salient-pole is disposed between the annular portion and a respective pole plate. Each pole plate has a first side and a second side. The first side and the second side oppose each other. A magnetic pole surface is formed between the first side and the second side and faces the magnetism-inducing surface of the permanent magnet. An air gap is formed between the magnetic pole surface and the magnetism-inducing surface. Each pole plate has an extension portion and a shrinking portion. The coil unit is coupled to the plurality of salient-poles.

Abstract: The generator comprises a stator (10) having a plurality of protruding portions for stator pole (12) on the outer peripheral surface of the stator main unit (11), and a rotor (20) having a plurality of protruding portions for rotor (22) mounted around the stator (10) in a rotatable state. Since the height of the plurality of protruding portions for stator pole (12) decreases along the rotational or reverse rotational direction of the rotor (20), a torque waveform containing odd-order components is generated when the rotor (20) is rotated coaxially around the stator (10). The plurality of protruding portions for stator pole (12) comprises a first protrusion group for stator pole (12A) and a second protrusion group for stator pole (12B), and the first protrusion group for stator pole (12A) and the second protrusion group for stator pole (12B) are formed with the protruding portions for stator pole (12) laid out along the circumferential direction spaced apart from each other.

Abstract: An inner-rotor-type motor comprises a casing, a shaft and a claw-pole member. The shaft is rotatably coupled to the casing, and coupled to a permanent magnet having a magnetism-inducing surface. The claw-pole member is coupled within the casing and has an annual portion and a plurality of salient-poles. The annual portion has an inner circumferential wall. Each salient-pole is disposed between the annual portion and a respective pole plate. Each pole plate has a first side and a second side. The first side and the second side are opposing to each other. A magnetic pole surface is formed between the first side and the second side and faces the magnetism-inducing surface of the permanent magnet. An air gap is formed between the magnetic pole surface and the magnetism-inducing surface. Each pole plate has an extension portion and a shrinking portion. The coil unit is coupled to the plurality of salient-poles.

Abstract: Attachments are removably coupled to the magnetic core of a rotating electric machine, the magnetic core being shaped to include a plurality of coil-receiving slots that are separated by radial teeth. Each attachment is constructed as a unitary member and includes a base and a stem, the stem being dimensioned for fitted insertion within a recess formed in the distal end of a corresponding tooth. The base includes a convex bottom wall, a flattened top wall and a pair of non-planar sidewalls. The stem is integrally formed on the top wall of the base and includes a front end, a rear end, a flattened top wall and a pair of opposing sidewalls. A longitudinal groove is formed into each of the pair of opposing sidewalls of the stem. An outwardly protruding shoulder designed for engagement by a retention plate is formed into the front and rear ends of the stem.

Abstract: A self magnetizing motor, in which a magnetic substance is disposed at the rotor and a stator is provided with a magnetizing portion to magnetize the magnetic substance, and the magnetizing portion forms an exciter pole protruding toward the magnetic substance and a tip portion tapered at an end of the exciter pole, wherein a width of the exciter pole, a protruding length of the tip portion, and a width of the tip portion are formed in the ratio of 8-9:2-2.5:1-2.4, thereby increasing the intensity of magnetizing of the magnetic substance thus to improve the motor performance.

Abstract: A laminated body of a motor includes: a yoke spirally laminated to form a hollow cylindrical shape; a plurality of teeth protruding from one side edge of the yoke disposed along a longitudinal direction of the yoke and being separated apart at a predetermined distance; a plurality of notch portions on an opposite side edge of the yoke, each of the plurality of notch portions being aligned with each of the plurality of teeth; a stopping protrusion extendingly formed at a protruding end of the teeth in the longitudinal direction of the yoke; and an inclined portion having an inclined surface formed by decreasing a width of the stopping protrusion toward an end of the stopping protrusion so as to reduce cogging torque.