A method of replacing a failed interpole coil on a DC motor field frame having integral interpole coil cores. The failed interpole coil is removed from the interpole coil core of the field frame. A new interpole coil, separate from the corresponding interpole coil core, is wound to replace the failed interpole coil, the new interpole coil including conductor turns and insulation. A retainer is mounted to the field frame at an axial end thereof, the retainer having a body portion extending radially inward with a width configured to fit within an interior dimension of the new interpole coil. The retainer has a stand-off projecting from the body. The new interpole coil is assembled in a radial direction onto the corresponding interpole coil core such that the new interpole coil is positioned by the stand-off. The insulation of the new interpole coil is resin coated and cured.

A stator for an electric machine including a stator core including an outer shell, a plurality of stator teeth and a plurality of stator slots, wherein the plurality of stator slots is adapted to receive a stator winding of the electric machine; at least one auxiliary coil located adjacent to the stator core, and adapted to generate an auxiliary coil voltage during operation of the electric machine. The at least one auxiliary coil is located around at least a portion of one of the plurality of stator teeth such that said at least a portion of one of the plurality of stator teeth extends inside the at least one auxiliary coil.

A stator assembly for an electrical machine extends azimuthally around an axis. The assembly includes: a plurality of stator teeth projecting radially from a circumference of the stator assembly, wherein the teeth are spaced azimuthally from each other and extend along a direction parallel to the axis of the stator assembly; a plurality of slots defined by azimuthal spacing of the stator teeth, wherein the plurality of slots extends along a direction parallel to the axis of the stator assembly, wherein the slots are arranged to receive a plurality of stator windings; and one or more dividers positioned within the plurality of slots, wherein the dividers define a plurality of cavities for receiving the plurality of stator windings.

A kinetic energy storage system is provided. The kinetic energy storage system comprising: a vacuum container enclosing a vacuum chamber; and a flywheel located within the vacuum chamber, the flywheel being configured to convert electrical energy into kinetic energy, wherein the flywheel comprises: a rotor assembly and a stator assembly located within the rotor assembly.

A method for producing the periphery of a rotor for a current-excited electric machine includes providing a rotor yoke, rotor poles formed separately from and mechanically connectable to the rotor yoke, and a coil carrier having a plurality of coil bodies and flexible connecting sections located between the coil bodies and by which the position of the coil bodies relative to one another is changeable. The coil carrier is brought into a production position by the flexible connecting sections and is equipped with an energizable winding by winding sections wound around the coil bodies. The rotor poles and the coil bodies are joined together to form pole coils. The coil carrier is transferred from the production position to an installation position by the flexible connecting sections, and the rotor poles, which are connected to the coil bodies of the coil carrier, are mechanically connected to the rotor yoke.

A synchronous machine (100) has a frame (110), a shaft (115), a main section (120), and an exciter section (125). The main section (120) has a stator winding (130) which is mounted on the frame, and a rotor winding (135) which is mounted on the shaft. The exciter section has a transformer (140) and a rectifier (145). The transformer has a primary winding (140A) mounted on the frame and a secondary winding (140B) mounted on the shaft. The rectifier is mounted on the shaft and rectifies an output of the secondary winding to provide a rectified output to the rotor. A control unit (170) provides a high-frequency control signal to the primary winding. This signal is magnetically coupled to the secondary winding, rectified, and then applied to the rotor to control the operation of the synchronous machine.

A stator assembly method and stator assembly apparatus in which coils that have slot housed portions and coil ends formed from a conductor are mounted to an annular stator core that includes slots formed between adjacent teeth that extend from a back yoke toward an inner side in a radial direction.

A stator for an electric machine, comprising a stator core and a stator winding, wherein the stator core has a plurality of slots, which are spaced apart in a circumferential direction and have a depth running in the radial direction, and allows the arrangement of slot sections of the stator winding in a plurality of radially spaced-apart radial positions, wherein the stator has a strip-like winding unit comprising a first and a second winding conductor, wherein the two winding conductors run in a first and a second layer of the winding unit and each comprises: a plurality of straight slot sections which run in a transverse direction of the winding unit and are arranged in parallel, a plurality of first bent end sections which each interconnect two slot sections of the associated winding conductor and are arranged on a first longitudinal side of the winding unit, a plurality of second bent end sections which each interconnect two slot sections of the associated winding conductor and are arranged on a second longitudinal side of the winding unit, which second longitudinal side is situated opposite the first longitudinal side, wherein, the first and the second bent end sections each interconnect a slot section of the associated winding conductor in the first layer and a slot section of the associated winding conductor in the second layer, wherein a first slot section is arranged in a first slot in a first radial position, and a second slot section, which is directly connected to the first slot section by a first end section, is arranged in a second slot in a second radial position which is offset by two radial positions in relation to the first radial position.

An axial flux induction machine comprises at least two stators and one rotor where the stators include an inner and outer ring of coils. The stator is comprised of two mirrored structures constructed such as to secure wire coils, amplify magnetic characteristics, and provide a structure upon which to secure a rotary shaft. The structures supporting the outer ring of coils can be in contact between the two stators and the outer ring can be spaced further from the rotary shaft than the inner ring of coils and also further from the rotary shaft than an outer edge of the rotor.

A method for producing a pole housing for an electric motor includes preparing a tube lateral surface from a preferably pre-galvanized sheet metal material and shaping the tube lateral surface to form a cylindrical pole tube from the sheet metal material in such a way that longitudinal edges of the tube lateral surface extended in the tube longitudinal direction face towards one another. The longitudinal edges of the tube lateral surface are joined to one another to form a closed pole tube. A previously-provided cover is form-lockingly and/or force-lockingly fastened as a bearing plate to a front end face of the pole tube and a fluid-impermeable joint is formed between the cover and the pole tube. A pole housing for an electric motor and an electric motor having a pole housing are also provided.