Hybrid-secondary uncluttered induction machine
AssigneeLockheed Martin Energy Research Corporation
InventorJohn S. Hsu
Life of this patent
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Abstract
An uncluttered secondary induction machine (100) includes an uncluttered rotating transformer (66) which is mounted on the same shaft as the rotor (73) of the induction machine. Current in the rotor (73) is electrically connected to current in the rotor winding (67) of the transformer, which is not electrically connected to, but is magnetically coupled to, a stator secondary winding (40). The stator secondary winding (40) is alternately connected to an effective resistance (41), an AC source inverter (42) or a magnetic switch (43) to provide a cost effective slip-energy-controlled, adjustable speed, induction motor that operates over a wide speed range from below synchronous speed to above synchronous speed based on the AC line frequency fed to the stator.
Claims12
An uncluttered electrical machine comprising:
- a first stator having at least one winding disposed thereon, said stator having a cylindrical portion defining a central axis for the machine;
- a first rotor having at least one current-carrying conductor disposed thereon for rotation about the central axis of the machine;
- a transformer having a second rotor mounted for rotation around the central axis with the first rotor, wherein the second rotor is electrically connected to the current-carrying conductor in the first rotor, the transformer also having a second stator mounted adjacent the first stator, wherein the second stator and the second rotor each have conductors disposed in a peripheral direction around the central axis, so as to couple only slip-frequency flux and not rotor rotational flux, and further comprising a device which is electrically connected to the second stator to control current in said second stator, which further controls slip-frequency flux in the second rotor, and which further controls slip-frequency current in the first rotor which is electrically connected to the second rotor.
Dependencies are inferred from the claim text.