| CPC H02J 7/14 (2013.01) [H02J 7/0013 (2013.01); H02J 7/02 (2013.01)] | 20 Claims |
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1. An energy storage power source, comprising:
a machine input configured to receive a variable AC input voltage Vin at a variable frequency;
a wound-rotor induction machine (WRIM) including a primary winding that is wound 360 degrees around a first magnetic core and coupled to the input to receive the AC input voltage Vin, a secondary winding that is wound 360 degrees around a second magnetic core configured to rotate relative to the first magnetic core and coupled to a load producing output and N tertiary windings each wound 360/N and distributed around the first magnetic core and magnetically coupled to both the primary and secondary 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 ESEs; and
a WRIM controller,
wherein in a charging state, the AC input voltage is coupled to the primary winding to create a traveling magnetic field to provide relative rotation between the first and second magnetic cores and to magnetize the tertiary windings to provide power through the AC/DC converters to selectively charge one or more of the N ESEs; and
wherein in a discharge state, one or more of the N ESEs discharge energy back through the respective AC/DC converters to excite the respective tertiary windings to create a traveling magnetic field to magnetize an airgap to assist the relative rotation between the first and second magnetic cores and 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 energy to the load producing output.
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