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An auxiliary power unit for aircraft with a load compressor that delivers cabin air free of oil contamination by supporting a drive shaft for the load compressor with oil-free bearings and coupling the load compressor to a gearbox and power head for the auxiliary power unit through a synchronous mag

An auxiliary power unit for aircraft with a load compressor that delivers cabin air free of oil contamination by supporting a drive shaft for the load compressor with oil-free bearings and coupling the load compressor to a gearbox and power head for the auxiliary power unit through a synchronous magnetic torque coupling on an opposite side of the gearbox to which the power is mounted.

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What is claimed is: 1. A gas turbine-powered aeronautical auxiliary power unit (APU) with a power head coupled to one side of a gearbox through a high-speed shaft that provides cabin air for an aircraft that is free of oil contamination, comprising: a load compressor with a drive shaft supported by

What is claimed is: 1. A gas turbine-powered aeronautical auxiliary power unit (APU) with a power head coupled to one side of a gearbox through a high-speed shaft that provides cabin air for an aircraft that is free of oil contamination, comprising: a load compressor with a drive shaft supported by oil-free bearings; and an oil-impervious synchronous magnetic torque coupling for coupling the load compressor drive shaft to the high-speed shaft on an opposite side of the gearbox from the power head. 2. The APU of claim 1, wherein the oil-free bearings comprise air bearings. 3. The APU of claim 1, wherein the oil-free bearings comprise electromagnetic bearings. 4. The APU of claim 1, wherein the magnetic torque coupling comprises inner and outer concentric permanent magnet (PM) arrays that are fluidically and mechanically isolated from each other by an oil barrier diaphragm. 5. The APU of claim 4, wherein the load compressor drive shaft is connected to one of the concentric PM arrays and the high-speed shaft is connected to the other one of the concentric PM arrays. 6. A gas turbine-powered aeronautical auxiliary power unit (APU) with a power head coupled to one side of a gearbox through a high-speed shaft that provides cabin air for an aircraft that is free of oil contamination, comprising: a load compressor with a drive shaft supported by air bearings; and an oil-impervious synchronous magnetic torque coupling comprising inner and outer concentric permanent magnet (PM) arrays that are fluidically and mechanically isolated from each other by an oil barrier diaphragm for coupling the load compressor drive shaft to the high-speed shaft on an opposite side of the gearbox from the power head. 7. The APU of claim 6, wherein the load compressor drive shaft is connected to one of the concentric PM arrays and the high-speed shaft is connected to the other one of the concentric PM arrays. 8. A gas turbine-powered aeronautical auxiliary power unit (APU) with a power head coupled to one side of a gearbox through a high-speed shaft that provides cabin air for an aircraft that is free of oil contamination, comprising: a load compressor with a drive shaft supported by electromagnetic bearings; and an oil-impervious synchronous magnetic torque coupling comprising inner and outer concentric permanent magnet (PM) arrays that are fluidically and mechanically isolated from each other by an oil barrier diaphragm for coupling the load compressor drive shaft to the high-speed shaft on an opposite side of the gearbox from the power head. 9. The APU of claim 8, wherein the load compressor drive shaft is connected to one of the concentric PM arrays and the high-speed shaft is connected to the other one of the concentric PM arrays.