Patent ID: 11929619
Assignee: RAYTHEON COMPANY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An energy storage power source, comprising:
a wound-rotor induction machine (WRIM) including N tertiary windings each wound 360/N degrees around a first magnetic core and secondary winding wound 360 degrees around a second magnetic core and coupled to a load producing output, said first and second magnetic cores separated by a radial airgap and configured to rotate relative to each other;
a shaft that is coupled to either the first or the second magnetic core;
a prime mover configured to rotate the shaft and supply motive power to the WRIM;
one or more AC capacitor banks coupled to either a primary winding wound 360 degrees around the first magnetic core or the tertiary windings;
N energy storage elements (ESEs);
N bi-directional AC/DC converters that each couple one of the tertiary windings to a respective one of the energy storage elements;
a WRIM controller,
wherein in a charging state, the prime mover rotates the shaft to magnetize the radial airgap with reactive excitation supplied by the one or more AC capacitor banks to self-excite the WRIM, said one or more AC capacitor banks providing a leading power-factor reactive power to balance the lagging power-factor reactive power required to magnetize the radial airgap and leakage inductances of the windings on the first magnetic core and to excite the tertiary windings to provide controlled power through the AC/DC converters to selectively charge the N ESEs; and
wherein in a discharge state, at least some capacity of the N ESEs are discharged back through the AC/DC converters to excite the tertiary windings to create a revolving magnetic field to magnetize the radial airgap and to supply real power to the second magnetic core to individually contribute to a total machine magnetic flux to magnetize the secondary winding to induce an AC output voltage on the secondary winding proportional to the sum of the voltages from the discharging ESEs and deliver a portion of the N ESEs energy capacity as electrical energy to the load producing output.