Stirling machine

A Stirling machine comprising:

• a displacer piston (6, 6a) comprising two working faces,
• a generator or an electric motor comprising a moving member,
• a cylinder (2),
• an expansion chamber (VE) and a compression chamber (VC) which constitute the working volume of said Stirling machine within said cylinder,
• a hot side heat exchanger (7) linked to a heat source, a regenerator (9), and a cooling exchanger (8) linked to a heat sink, and
• an elastic return means exerting a force on the displacer piston (6, 6a),
• the displacer piston (6, 6a) being mounted in said cylinder (2), in which it periodically displaces a working gas between the expansion chamber (VE) and the compression chamber (Vc), respectively associated with the two working faces of said displacer piston (6, 6a) and causing said gas to pass through said hot side heat exchanger (7), regenerator (9), and cooling exchanger (8),
• the cross-sectional area ratio (aC/aE) between the two working faces of said piston (6, 6a) being greater than or equal to 0.35 so that its displacement along an axis X oriented toward the expansion volume (VE) generates an in-phase pressure component Px of said working gas opposing said displacement of said piston (6, 6a), so as to transmit all of said mechanical energy produced between this displacer piston (6, 6a) and said moving member (14),
• characterized in that:
• the ratio of cross-sectional area (aC/aE) is less than 0.70, and the Stirling machine further includes at least one resonant piston (10), coupled to said displacer piston (6, 6a) by a quantity of energy proportional to said pressure component Px.