Abstract: A stator of an electrical machine operable as a motor or a generator, applicable to a radial-axial type machine. The stator includes a plurality of stator segments disposed circumferentially about an axis. Each segment has a generally wedge shaped core and a winding wound around the core. The winding is bent to have portions that are disposed on multiple planes. The core includes an elongated wedge tip portions aligned parallel to the axis and an outer radial face opposite to the tip portion. The multiple planes include at least one plane substantially normal to the axis and at least one plane tangential to the radial face.

Abstract: A stator of an electrical machine operable as a motor or a generator, applicable to a radial-axial type machine. The stator includes a plurality of stator segments disposed circumferentially about an axis. Each segment has a generally wedge shaped core and a winding wound around the core. The winding is bent to have portions that are disposed on multiple planes. The core includes an elongated wedge tip portions aligned parallel to the axis and an outer radial face opposite to the tip portion. The multiple planes include at least one plane substantially normal to the axis and at least one plane tangential to the radial face.

Abstract: An polyphase machine includes a stator having a plurality of parallel stator windings, a plurality of phase voltage terminals, each of the stator windings fastened to a corresponding phase voltage terminal, and at least one neutral terminal, each of the stator windings forming a common ground fastened to the neutral terminal. At least one of the stator windings is fastened to the corresponding phase voltage terminal or neutral terminal by a connection that does not involve a heat induced joining method. In an exemplary embodiment, the connection includes a lead wire protruding from the stator winding and terminated with a connector, such as a ring lug, fastened to the respective terminal with a mechanical fastener, such as a rivet or threaded rivet. A method for connecting stator windings in a polyphase machine is also provided.

Abstract: A brushless permanent magnet electric motor or generator having a hollow rotor, is provided with apertures in ends of the rotor. The apertures allow air to flow through the center of the hollow rotor and remove heat from the rotor. Vanes or blades can be fixed to the shaft within the rotor or fixed to ends of the rotor to force air through an interior of the hollow rotor. Ends of the rotor can be shaped to form fan blades that draw air through the interior of the rotor. Air flowing through the rotor can be recirculated by flowing back through passageways formed between the stator and the motor/generator casing, through passages through the stator, and/or back through an air gap between the stator and the rotor.

Abstract: A method of assembling a substantially cylindrical motor casing having a plurality of cooling elements, includes the steps of forming a plurality of sections, each of the sections including a plurality of cooling channels extending therethrough in a longitudinal direction or a plurality of cooling fins extending therefrom, and each of the sections including an edge on each side thereof, each of the edges extending substantially parallel to the plurality of cooling channels or cooling fins; and connecting the plurality of sections together along their respective edges so as to form a substantially cylindrical shape from the plurality of sections.