Ut-battelle, Inc.

Martin Marietta Energy Systems, Inc.

John W McKeever

John Sheungchun Hsu

Jih-Sheng Lai

Matthew Bligh Scudiere

Clifford P White

Robert W Young, Sr

George W Ott, Jr

Daoshen Chen

The invention is a terminal assembly having a casing with at least one delivery tapered-cone conductor and at least one return tapered-cone conductor routed there-through. The delivery and return tapered-cone conductors are electrically isolated from each other and positioned in the annuluses of ordered concentric cones at an off-normal angle. The tapered cone conductor service can be AC phase conductors and DC link conductors. The center core has at least one service conduit of gate signal leads, diagnostic signal wires, and refrigerant tubing routed there-through. A seal material is in direct contact with the casing inner surface, the tapered-cone conductors, and the service conduits thereby hermetically filling the interstitial space in the casing interior core and center core. The assembly provides simultaneous high-current, high-pressure, low-inductance, and high-reliability service.

High pressure, high current, low inductance, high reliability sealed terminals

An electric machine () has a disk-shaped rotor () disposed in an operating space between two opposing stator assemblies () to provide two axial air gaps (). The rotor () has a hub () and an outer ring () of non-magnetic material and is further provided with a plurality of permanent magnetic elements () for coupling flux that is induced by the magnetic field of the stator assemblies (). The permanent magnetic elements () are spaced apart and reluctance poles () are positioned in spaces between the magnetic elements () to couple additional flux induced by the magnetic field of the stator assemblies (). Various constructions and shapes (-) for the PM magnetic elements () are disclosed, and including PM covers () of ferromagnetic material for enhancing q-axis flux in the air gaps () and for reducing harmonics where toothed stators are used. Methods of providing increased torque using the the various rotor constructions are also disclosed.

Axial gap permanent-magnet machine with reluctance poles and PM element covers

A resonant, snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is supplied to the resonant snubber branches solely by the main inverter switches. Component count and size are reduced by use of a single semiconductor switch in the resonant snubber branches. Component count is also reduced by maximizing the use of stray capacitances of the main switches as parallel resonant capacitors. Resonance charging and discharging of the parallel capacitances allows lossless, zero voltage switching. In one embodiment, circuit component size and count are minimized while achieving lossless, zero voltage switching within a three-phase inverter.

Resonant snubber inverter

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Oak Ridge, TN, United States of America

John W McKeever