Quasi-isothermal Brayton Cycle engine

A non-cantilevered gerotor expander comprising:

• an inner gerotor;
• an outer gerotor;
• a first bearing arrangement adapted to support said inner gerotor, wherein said first bearing arrangement only is positioned on a first side of a seal plate;
• a second bearing arrangement adapted to support said outer gerotor, wherein at least one portion of said second bearing arrangement is positioned on a second side of said seal plate;
• a valve plate positioned adjacent to an end of said outer gerotor;
• and
• a stationary center shaft connected to said valve plate, wherein said inner gerotor and said outer gerotor are independently driven from one another.

A gerotor compressor comprising:

• an inner gerotor;
• an outer gerotor;
• a first bearing arrangement adapted to support said inner gerotor, wherein said first bearing arrangement only is positioned on a first side of a seal plate;
• and
• a second bearing arrangement adapted to support said outer gerotor, wherein at least one portion of said second bearing arrangement is positioned on a second side of said seal plate, and wherein said inner gerotor and said outer gerotor are independently driven from one another and said gerotor compressor is an axial-flow gerotor compressor.

A gerotor expander comprising:

• an inner gerotor;
• an outer gerotor;
• a first bearing arrangement adapted to support said inner gerotor, wherein said first bearing arrangement only is positioned on a first side of a seal plate;
• and
• a second bearing arrangement adapted to support said outer gerotor, wherein at least one portion of said second bearing arrangement is positioned on a second side of said seal plate, and wherein said inner gerotor and said outer gerotor are independently driven from one another and said gerotor expander is an axial-flow gerotor expander.