A rotor assembly for an electric machine is disclosed. The rotor core has a cylindrical body defining an outwardly facing peripheral surface comprising a slotted portion including a set of slots defined by a set of rotor teeth projecting outwardly from the peripheral surface. Each rotor tooth comprises a respective first distal tip and a respective first radial length extending radially from a center point of the rotor core to the first distal tip. The peripheral surface further comprises a non-slotted portion defining a respective second radial length, extending radially from the center point of the rotor core to the outwardly facing peripheral surface. The first radial length is less than the second radial length.

A laminated core for a rotor and/or a stator of a rotating electric machine includes teeth arranged adjacent to one another in a peripheral direction of the laminated core and delimiting slots for accommodating an electrical conductor that forms a winding. A cover unit is arranged on a side of an air gap between the rotor and the stator and delimits the slots in the radial direction. The cover unit has in a region of a respective one of the slots at least two tapering regions which are spaced apart from one another in the peripheral direction of the laminated core, with a material of the cover unit being thinner in the tapering regions in a radial direction of the laminated core than in a region of the cover unit adjoining the tapering regions.

In a magnet stack, an eddy current channel is cut off by an insulating layer in an insulating region of facing surface regions of the pair of magnets. Meanwhile, in a conducting region of the facing surface region of the pair of magnets, electrons can move between the pair of magnets via a conductor, and heat can be exchanged between the pair of magnets by the movement of electrons. Therefore, in the magnet stack, by cutting off the eddy current channel in the insulating region of the facing surface region of the pair of magnets, the degradation in magnet performance is suppressed and the cooling efficiency of the magnet is enhanced in the conducting region.

Provided is a stator for an electrical machine including a plurality of segments, wherein in order to reduce torque harmonics and power harmonics due to the interposed circumferential gap between two circumferentially adjacent stator segments, at least one of the two end teeth of each stator segment includes a circumferential protrusion at the respective tooth radial end, the circumferential protrusion protruding from the respective side face towards the respective circumferential end.

A method for integrally manufacturing a stator core and a housing for an electrical machine includes printing, by a three-dimensional (3D) printing process, the stator core. In addition, the method includes printing, by the 3D printing process, the housing. In particular, printing the housing occurs contemporaneously with printing the stator core. The method also includes printing, by the 3D printing process, at least one end cap and coupling the at least one end cap to the housing to enclose a cavity defined by the housing.

An electromechanical system comprising: a rotor comprising a plurality of teeth spaced about a circumference of the rotor, wherein the teeth of the rotor are equally spaced about the rotor according to a tooth spacing angle, and are skewed in an axial direction such that the circumferential positions of the teeth of the rotor vary along the axial length of the rotor, and first and second stator segments, each extending partway about the rotor and comprising a field winding and poles arranged to magnetically interact with the teeth of the rotor such that an alternating current (AC) back-emf is induced in the field winding upon rotation of the rotor. The poles of the first stator segment are angularly displaced about the rotor from the poles of the second stator segment such that the back-emf induced in the field winding of the first stator segment is phase shifted with respect to the back-emf induced in the field winding of the second stator segment.

This invention entails the use of fractal shapes as cores for electromagnets, and a concurrent shape of a fractal for the windings which surround it. The novelty of this invention lies not only with the shaping, but the advantage of such shaping, which includes producing a smaller form factor electromagnet for the same desired magnetic field strength, when compared to a conventional electromagnet. It will be appreciated that a range of devices including electromagnets, based on such fractal shaping, are additionally novel and include but are not limited to solenoid switches, relays, and other devices in which the fractal electromagnets are used to make a change in state of some device.

The present disclosure discloses a rotor of an induction motor comprising a rotor body (1), alternating rotor teeth (2) and rotor slots (3) arranged along a circumference of the rotor body (1), and a plurality of grooves (4) provided at an end of the rotor teeth (2) or a plurality of voids (5) provided within the end of the rotor teeth (2) that are provided symmetrically about a center line (10) of the rotor teeth (2). The rotor and the induction motor having the rotor of the present disclosure can, for example, reduce the radial force of the stator caused by the slotting effect by about 50%. Therefore, the user's comfort can be greatly improved, while the efficiency of the induction motor can be improved, and the life of the induction motor can be prolonged.

A salient pole machine a rotor having a rotor rim. A plurality of salient poles having a pole winding and extending in the radial direction are attached to the rotor rim, with the rotor rim having an outermost radial surface between the pole-rim interfaces. A plurality of axial rib-like rim extensions project radially from the outermost radial surface of the rotor rim with a predetermined circumferential distance between neighboring rim extensions. A plurality of axial pole grooves in the salient pole match and receive the rim extensions. Fixing elements fix the rim extensions in the pole grooves and are inserted axially into facing interface holes defined in facing sidewalls of the pole grooves and the rib-like rim extensions. The fixing elements are radially inward of the pole windings and are accessible for axial sliding removal from the facing interface holes.

This invention entails the use of fractal shapes as cores for electromagnets, and a concurrent shape of a fractal for the windings which surround it. The novelty of this invention lies not only with the shaping, but the advantage of such shaping, which includes producing a smaller form factor electromagnet for the same desired magnetic field strength, when compared to a conventional electromagnet. It will be appreciated that a range of devices including electromagnets, based on such fractal shaping, are additionally novel and include but are not limited to solenoid switches, relays, and other devices in which the fractal electromagnets are used to make a change in state of some device.