A rotor of a wind turbine large-diameter rotary electric machine has a hub configured to rotate about an axis of rotation; a tubular structure extending about the hub and supporting a plurality of active segments arranged about the axis of rotation; and a radial structure configured to connect the hub to the tubular structure, which is divided into a plurality of sectors connectable selectively to the radial structure.

A stator for a generator of a wind turbine is provided. The stator comprises a magnetic frame, magnets, and magnetic sections spaced from each other. The magnets are used to fasten the magnetic sections to the frame. Further, a flux switching machine for a wind turbine, in particular a generator for a wind turbine, is provided. The flux switching machine comprises a rotor and a stator.

An actuator system includes a housing with a screw shaft extending along a longitudinal axis. The stator component of an electric motor is coupled to the housing, with a rotor extending along the longitudinal axis. A thrust tube is engaged with the screw shaft, for example with a nut assembly configured to convert rotational motion of the rotor into linear motion of the thrust tube. A modular cooling assembly is selectively coupled to the exterior surface of the actuator housing, and configured to dissipate heat.

A method and apparatus for reducing or eliminating the effects of torque ripple and cogging torque and otherwise improving performance in an electromechanical machine such as a motor or generator. The rotor and/or stator is conceptually sectionalized and the sections spaced apart by amount sufficient to alleviate deleterious aspects of cogging torque and torque ripple. Positioning of the stator teeth or rotor magnets is determined based on the calculated spacing. Conceptual sections may be formed as physically individual segments. Unwound teeth may be disposed in end spaces between sections occupying less than the entire area of the end space.

For cooling an electric machine having stator windings, a housing including a series of interleading compartments is provided, the compartments being adapted for sealingly and removably enclosing one or more of the stator windings, so that during operation of the machine, a fluent coolant passing through the compartments and immersing the windings removes heat from the windings by thermal conduction. The disclosure has application to electric machines such as electric motors and generators, providing a modularised cooling system for the individual stator windings, allowing each one to be removed if necessary without requiring removal of the whole stator winding assembly.

The present disclosure relates to a method for assembling a large-diameter electric motor, the method includes: a preparing step: providing two or more stator segments for forming a stator and two or more rotor support segments for forming a rotor support; a splicing step: splicing the two or more stator segments and the two or more rotor support segments in a predetermined manner to form the stator and the rotor support that are coaxially assembled, respectively, and maintaining a predetermined gap between the stator and the rotor support in a radial direction; and an assembling step: inserting a plurality of magnetic pole modules into the predetermined gap, and assembling the plurality of magnetic pole modules to a mounting surface of the rotor support. The method can avoid the influence of a magnetic pulling force at an air gap between the stator and a rotor on an assembling process, and can improve the convenience of assembling the large-diameter electric motor on site.

A motor assembly is described and includes a housing; a plurality of motors disposed within the housing; and a drive shaft comprising a plurality of interconnected drive shaft segments, wherein each one of the drive shaft segments is driven by a different one of the motors connected to the drive shaft segment via an integrated overrunning clutch.

A tubular linear switched reluctance machine includes a segmented translator having a non-magnetic material body and ring segments of magnetic material axially separated from each other and provided on the body. The ring segments are distributed along the axial direction of the body. The machine also includes a stator arranged to electromagnetically interact with the segmented translator, wherein the stator has a plurality of coaxially arranged annular modules, and a respective annular non-magnetic spacer arranged between each pair of subsequently arranged modules.

An electric motor includes a rotor having a rotor shaft part and a first shaft part and a second shaft part. The rotor shaft is situated axially between the first and the second shaft parts. The first shaft part includes a first bearing seat and is connected to the rotor shaft part in a torsionally fixed manner, and the second shaft part includes a second bearing seat and is connected to the rotor shaft part in a torsionally fixed manner.

A flywheel system includes a rotor and a fixture. The rotor forms an aperture. The fixture includes a bottom support, a top support, and a shaft connecting the bottom support to the top support. The shaft passes through the aperture. The bottom support and the top support are outside opposite ends of the aperture. The rotor is configured to rotate about the shaft. A method for operating a flywheel system includes converting between rotational energy of a rotor and electrical energy in windings of a generator stator that is implemented in a stationary shaft passing through an aperture of the rotor, while the rotor is rotating about the shaft.