A system contains a double fed induction machine having a stator and a rotor, a fly wheel coupled to the rotor, and a control device for providing a rotor voltage and a rotor current to the rotor. The control device is connected to the rotor and the stator and is capable of generating the rotor voltage and rotor current in response to an electrical signal that is applied to the stator. The control device has a multilevel converter and a control unit for controlling the multilevel converter.

An electric drive assembly for a motor vehicle comprises a high-speed electric machine with a nominal rotational speed of at least 20,000 revolutions per minute and with a high-speed rotor that can be used as a flywheel mass for storing kinetic energy; a superimposed transmission having a drive element, a regulating element and a driven element, wherein the drive element is drivable by an electric machine around a drive axis, wherein the regulating element is rotatable around a regulating axis and wherein the driven element is drivingly connected to the regulating element and the drive element; an electromagnetic regulating device having a stator and a rotor that is connected to the regulating element in a rotationally fixed way, wherein by means of magnetic forces acting in the circumferential direction between the stator and the rotor, a regulating moment can be transmitted to the rotor, wherein the magnetic forces are variably adjustable.

Robust electro-static (ES) device embodiments, with application to energy storage flywheels as an example, are described that provide reliable, high-efficiency operation in the presence of thermal and mechanical perturbations, as well as seismic events. Electro-static generators and motors, when augmented with magnetic bearings, passive three-dimensional stabilization techniques and dynamic touch-down bearings, enable robust performance in the face of these environmental concerns, as well as efficient operation during typical operational sequences, including spin-up and steady-state modalities.

An electric machine including a first energy consuming unit and a second energy consuming unit, the first energy consuming unit requiring a higher power energy source and the second energy consuming unit requiring a lower power energy source, wherein the machine further includes a first energy storage device and a second energy storage device, the first energy storage device having a higher power with respect to the second energy storage device, wherein the first energy storage device is configured to power the first energy consuming unit, wherein the second energy storage device is configured to power the second energy consuming unit, and wherein the first energy storage device is connectable to a charger for charging, the first energy storage device requiring a lower charging time for reaching its maximum state of charge than the second energy storage device, and wherein the first energy storage device is configured to directly provide power to the first energy consuming unit.

A system may include a first node having a first mechanical energy storage unit (MESU) located in a first geographical location, the first node being coupled for communication with an energy as a service (EaaS) platform. A system may include a second node having a second MESU located in a second geographical location that is distinct from the first geographical location, the second node being coupled for communication with the EaaS platform, wherein the first MESU of the first node and the second MESU of the second node are each configured to send a power banking status to the EaaS platform and to extract or bank power based on signals received from the EaaS platform.

This disclosure describes novel hybrid energy storage systems for providing short-term and long-term storage and delivery of electricity generated by any energy source including renewable energy sources such as solar energy and wind energy. The hybrid energy storage systems described herein have a higher overall real-world efficiency than energy storage systems currently available.

A stored energy power source uses a wound-rotor induction machine (WRIM) to receive energy from a prime mover via a rotating shaft, provide magnetization reactive energy from a self-excited AC capacitor bank, store the energy in N energy storage elements (ESEs) via tertiary windings, and discharge the ESEs to deliver energy via a secondary winding to a load producing output. Each discharging ESE contributes to a total flux at the secondary winding to sum the individual ESEs voltages. These voltages can be stepped up or down by a transformation ratio between the secondary winding and each of the tertiary windings. A flywheel may be coupled to the shaft to store and delivery kinetic energy. Load factor power control can be used to stabilize the output voltage. The source may be configured to allow for the bi-directional flow of energy between the ESEs, the flywheel and the load. The WRIM provides a safe, reliable and efficient system to provide high-level AC and DC output voltages.

A stacked lamination endplate for a rotor that includes a number of adjacent laminations, stacked one on top of another, wherein each lamination has an identical shape, the shape having a central region, symmetric about a center axis, and a number of spokes, each spoke emanating radially outward from the central region, where each spoke includes a through-hole at its distal end, and wherein the laminations are stacked one on top of another and aligned, enabling, for each spoke, a bolt to be inserted through a corresponding through-hole of each lamination.

A flywheel system includes a rotor configured to rotate about a rotation axis. The flywheel system further includes a fixture and an active magnetic bearing module for actively stabilizing the rotor relative to the fixture. The active magnetic bearing module includes a plurality of first magnetizable elements mechanically coupled to or integrated in the rotor, and a plurality of electromagnets mechanically coupled to the fixture and configured to magnetically couple with the plurality of first magnetizable elements to actively stabilize the rotor relative to the fixture. Each of the first magnetizable elements is farther than each of the electromagnets from the rotation axis.

A flywheel assembly for a renewable energy generation system includes a flywheel housing defining a cavity therein, a flywheel rotatably disposed within the cavity of the flywheel housing, where the flywheel is simultaneously formed from the same component as the flywheel housing, a magnetic levitation disk defining opposed upper and lower surfaces, the upper surface supporting the flywheel and the lower surface including a first plurality of magnets disposed thereon, and a base plate having a second plurality of magnets disposed on a surface thereof that is facing the first plurality of magnets, the second plurality of magnets having a polarity that is opposite of a polarity of the first plurality of magnets such that the magnetic force of the first and second plurality of magnets urges the magnetic levitation disk away from the base plate.