The electric generator with the rotational resistance avoidance feature in the present invention comprises a rotating set of magnet parts interposed between at least two rotating sets of conductor coil parts, which are respectively installed on opposite sides of the rotating set of magnet parts. The diameters of the rotating sets of conductor coil parts are configured to be larger than the diameter of the rotating set of magnet parts. The rotational speed of the conductor coil parts and the magnet parts are therefore different, which causes the induction of the electromotive force within the conductor coils by way of variation of the magnetic field. When the mechanical power input is applied only on the rotating set of magnet parts and the electromotive force induced in the conductor coil, which has been connected to a load, is applied to a load; the electrical current will induce the conductor coil itself to generate magnetic polarities which are similar to the original magnetic polarities of the permanent magnet. The sets of conductor coils are pushed by the said pushing force to be continuously rotated in a clockwise direction (freely rotated without being driven by the mechanical power input). The rotating set of magnets in the middle is also continuously rotated by the mechanical power input. With this configuration, the rotational resistance can be avoided. Therefore, the additional mechanical power input is not necessary (rather, only a partial increase is required), and the electrical power can be generated by converting the magnetic energy stored in permanent magnets, to be supplied to the load.

A compound motor-generator system including a first motor-generator and a second motor-generator. The first motor generator includes a stator having a set of three-phase field windings and a first rotor disposed inside and coaxial with the stator and configured to rotate relative to the stator. The second motor-generator includes a rotational stator and a second rotor coupled to a common shaft with the rotor of the first motor-generator and disposed inside and coaxial to the rotational stator. The rotational stator is configured to rotate relative to the second rotor and at a higher rotational speed than the second rotor.

This disclosure describes embodiments of novel line dispensing devices and methods for dispensing and retracting a line of a line dispensing device.

A propulsion method includes: providing a pair of synchronized rotors rotatably mounted on a frame with a bearing having a bearing outer race, bearing balls, and bearing inner race; providing a plurality of permanent magnets mounted on the pair of synchronized rotors; rotating the pair of synchronized rotors such that one of the pair of synchronized rotors rotates in a clockwise direction and the other of the pair of synchronized rotors rotates in a counterclockwise direction; loading an outer portion of the outer bearing race, bearing ball, and inner bearing race of each of the bearings, a load on the outer portion of the bearings corresponding to an attractive force between the permanent magnets of the pair of synchronized rotors. A thrust is imparted on the frame in a direction corresponding to a direction of loading of the inner bearing race.

An electromechanical integrated machine (EIM) according to an exemplary aspect of the present disclosure includes, among other things, an internal rotor coupled to a vehicle wheel and an external rotor coupled to a flywheel. An electrified vehicle according to an exemplary aspect of the present disclosure includes, among other things, a first EIM associated with a first wheel, a second EIM associated with a second wheel, a battery having energy to power the first and second wheels, and a flywheel to receive energy from the first and second EIMs during braking. Each EIM includes an internal rotor coupled to the respective first or second wheel and an external rotor coupled to the flywheel.

An electric motor generator system has a hollow rotatable shaft, a coil spar, and a plurality of magnet portions. The hollow rotatable shaft has a central longitudinal axis. The coil spar comprises one or more coil assemblies and is positioned concentrically within the hollow rotatable shaft. Each of the magnet portions is shaped to conform to a radially inwardly facing surface of the shaft. Each of the plurality of magnet portions abuts conformally against the radially inwardly facing surface of the shaft between the radially inwardly facing surface and the or each coil assembly.

A double-stator PM machine having: an outer stator generating an outer electromagnetic field dependent on an outer three-phase supply current; an inner stator generating an inner electromagnetic field dependent on an inner three-phase supply current; a PM rotor rotated by the outer and inner electromagnetic fields between the outer and inner stators; and a control arrangement controlling the outer and inner supply currents. There is an electrical connection between neutral points of the outer and inner stators. The control arrangement is configured for controlling the outer and inner to supply currents such that there is a relative angle shift of 30 between the outer and inner supply currents and such that a third order current harmonic component is circulated between the outer and inner stators.

A counter rotating electrical generator has concentric rotors that rotate in opposite directions. One rotor has windings and rotates in a first direction. The other rotor rotates in the opposite direction and creates a magnetic field. The windings of the first rotor cut through the magnetic field of the other rotor rotating in the opposite direction, thus creating an electric potential. The counter rotating electrical generator may be configured to produce alternating current or direct current.

An axial flux electrical machine comprises a first flux generating assembly, a second flux generating assembly, a shaft and a speed controller. The shaft has an axis of rotation. Each of the first flux generating assembly and the second flux generating assembly is rotationally located on the shaft in axial juxtaposition to one another, with the first flux generating assembly being axially separated from the second flux generating assembly by a separation distance. The speed controller is configured to modify a magnetic field generated by either of the first flux generating assembly and the second flux generating assembly so as to control a rotational speed of the electrical machine.

A metallurgical device, in particular a casting installation, rolling mill or strip processing installation, including at least one machine part rotating about an axis, wherein an energy consumer that is in electrical connection with an energy source is arranged in the machine part. To supply the energy consumer with energy on a sustained basis in spite of adverse ambient conditions, the energy source is designed as a generator which is in connection with the rotating machine part for rotation therewith, wherein the generator is otherwise free of any mechanical connection with the metallurgical device and wherein the generator has a housing element, on which at least one eccentric mass arranged at a location that is at a distance radially from the axis.