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A linear, multi-cylinder Stirling cycle machine comprises a plurality of Stirling cycle units arranged in an open series or closed loop. Each of the units comprises a compression space in fluid communication with an expansion space via a regenerative heat exchange assembly. The compression space and

A linear, multi-cylinder Stirling cycle machine comprises a plurality of Stirling cycle units arranged in an open series or closed loop. Each of the units comprises a compression space in fluid communication with an expansion space via a regenerative heat exchange assembly. The compression space and expansion space are in fluid communication with, respectively, a compression piston and an expansion piston, and the separate Stirling cycle units are mechanically coupled together by linear power transmitters, which connect the expansion piston of one unit to the compression unit of the other. The linear power transmitters can be linear transducers such as linear motors or generators. In the open series arrangement the series of Stirling cycle units can have an initiating compressor at one end and a terminating expander at the other end. hi the closed loop arrangement, one of the Stirling cycle units can include an exergy throttle to restrict gas flow rates to control the speed of the machine. The machine may be used in a combined heat and power apparatus with some Stirling cycle units acting as engine/generators and with waste heat being used for heating. Some Stirling cycle units can be used for cooling or heat pumping.

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1. A linear, multi-cylinder Stirling cycle machine comprising three or more Stirling cycle units connected together in series with each other, each of said units comprising a compression space in fluid communication with an expansion space via a heat exchange assembly, said compression space and exp

1. A linear, multi-cylinder Stirling cycle machine comprising three or more Stirling cycle units connected together in series with each other, each of said units comprising a compression space in fluid communication with an expansion space via a heat exchange assembly, said compression space and expansion space also being in fluid communication with, respectively, a compression piston and an expansion piston, and wherein each of said units is mechanically coupled to another of said units by a linear power transmitter, each of said linear power transmitters connecting the expansion piston of a single one of said units to the compression piston of a single one of another of said units. 2. A machine according to claim 1 wherein the heat exchange assembly comprises a series connection of a first heat exchanger, a regenerator and a second heat exchanger. 3. A machine according to claim 1, wherein the linear power transmitter is a linear power transducer. 4. A machine according to claim 1 wherein the Stirling cycle units are connected together in an open series configuration with a compressor initiator at one end connected to the compression space of the first unit in the series and an expander terminator at the other end connected to the expansion space of the last unit in the series. 5. A machine according to claim 1 wherein the Stirling cycle units are connected together in a closed loop comprising three or more units with the expansion piston of each unit being connected to the compression piston of the next unit of the loop via said linear power transmitter. 6. A machine according to claim 1 wherein the compression and expansion spaces are cylindrical. 7. A machine according to claim 1 wherein the axis of each connection between the heat exchange assembly and the compression and expansion spaces is aligned with the axis of the respective compression or expansion piston. 8. A combined heat and power apparatus comprising a linear, multi-cylinder Stirling cycle machine according to claim 1, at least one of said Stirling cycle units acting as an electricity generator, whereby heat supplied to said heat exchange assembly is used to produce electricity, and surplus heat is output for heating. 9. A set of modules for assembling into a machine according to claim 1, wherein the modules comprise a hot end module comprising a hot end heat exchanger connected between a thermal regenerator and a thermal buffer, a cooler module comprising a cold end heat exchanger, and a transmitter module comprising a moving assembly of expansion and compression pistons and a linear power transmitter, whereby the joints between the modules are at relatively low temperature parts of the machine. 10. A machine according to claim 1 wherein said three or more Stirling cycle units includes a first Stirling cycle unit, a second Stirling cycle unit, and a third Stirling cycle unit, and wherein the first Stirling cycle unit is mechanically coupled to the second Stirling cycle unit by a first linear power transmitter, and the second Stirling cycle unit is mechanically coupled to the third Stirling cycle unit by a second linear power transmitter. 11. A machine according to claim 2 wherein the first heat exchanger is a low temperature heat exchanger and the second heat exchanger is a high temperature heat exchanger. 12. A machine according to claim 2 wherein at least the regenerator and one of the heat exchangers has a cylindrical form. 13. A machine according to claim 3 wherein the power transducer is adapted to receive a power input to the machine and the heat exchange assembly operates as a heat pump or cooler. 14. A machine according to claim 3 wherein the heat exchange assembly absorbs heat and the linear power transducer outputs power from the machine. 15. A machine according to claim 3, wherein the linear power transducer is an electromechanical transducer. 16. A machine according to claim 15 wherein the electromechanical transducer is a linear motor or generator. 17. A machine according to claim 4 wherein the exciter compressor controls the operating frequency and power of the machine. 18. A machine according to claim 4 wherein the Stirling cycle units are arranged coaxially. 19. A machine according to claim 5 wherein the Stirling cycle units are disposed with their axes coplanar. 20. A machine according to claim 5 wherein a throttle is included in one of the Stirling cycle units to control the power of the machine. 21. A machine according to claim 20 wherein the throttle has an array of radially-extending fixed petals mutually spaced to allow fluid flow between them and arranged coaxially therewith an array of radially-extending spaced movable petals disposed such that axial rotation of the movable and fixed petals selectively varies the fluid flow space between the fixed petals. 22. A combined heat and power apparatus according to claim 8 wherein one of said Stirling cycle units acts as a heat pump or cooler. 23. An apparatus according to claim 8 wherein said three or more Stirling cycle units includes a first Stirling cycle unit, a second Stirling cycle unit, and a third Stirling cycle unit, and wherein the first Stirling cycle unit is mechanically coupled to the second Stirling cycle unit by a first linear power transmitter, and the second Stirling cycle unit is mechanically coupled to the third Stirling cycle unit by a second linear power transmitter.