A linear drive motor with symmetric magnetic fields for a linear drive motor with symmetric magnetic fields for a cooling system a cooling system

A cooling system (10) has a compressor (4) for producing cyclic pressure conditions within a refrigerator's system's volume. The compressor (4) alternately increases and decreases the working volume (65), thus raising and lowering the coolant pressure. An expander (59) reacts to this cyclic pressure change in such a manner to achieve a net removal of work, or, in other words, provide cooling at the cold tip (55).