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A compressor includes an orbiting member and a non-orbiting member mounted relative the orbiting member to define first and second chambers disposed between the orbiting and non-orbiting members. The non-orbiting member forms a seal to generally prevent fluid communication between the first and seco

A compressor includes an orbiting member and a non-orbiting member mounted relative the orbiting member to define first and second chambers disposed between the orbiting and non-orbiting members. The non-orbiting member forms a seal to generally prevent fluid communication between the first and second chambers when in a first position and breaks the seal to allow fluid communication between the first and second chambers when in a second position. A structure supports the orbiting and non-orbiting members for relative orbital movement therebetween and a time pulsed actuation apparatus is coupled to the structure and configured to selectively break the seal.

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We claim: 1. A compressor comprising: an orbiting member; a non-orbiting member mounted relative said orbiting member to define first and second chambers disposed between said orbiting and non-orbiting members and forming a seal to generally prevent fluid communication between said first and second

We claim: 1. A compressor comprising: an orbiting member; a non-orbiting member mounted relative said orbiting member to define first and second chambers disposed between said orbiting and non-orbiting members and forming a seal to generally prevent fluid communication between said first and second chambers when in a first position and breaking said seal to allow fluid communication between said first and second chambers when in a second position; a structure supporting said non-orbiting member; and a time pulsed actuation apparatus coupled to said structure and configured to selectively break said seal. 2. The compressor of claim 1, wherein said non-orbiting member includes a sealing member forming said seal between said first and second chambers. 3. The compressor of claim 2, wherein said sealing member is movable relative said orbiting member. 4. The compressor of claim 3, wherein said sealing member abuts said orbiting member when in said first position. 5. The compressor of claim 3, wherein said sealing member is spaced apart from said orbiting member when in said second position. 6. The compressor of claim 2, wherein said actuation apparatus includes a spring urging said sealing member into engagement with said orbiting member. 7. The compressor of claim 1, wherein said first chamber forms a compression chamber. 8. The compressor of claim 1, wherein said non-orbiting member includes a discharge passage formed therein. 9. The compressor of claim 1, wherein said actuation apparatus includes a solenoid configured to selectively break said seal. 10. The compressor of claim 1, wherein said actuation apparatus includes a magnetic device configured to selectively break said seal. 11. The compressor of claim 1, wherein said actuation apparatus includes an electromagnetic device configured to selectively break said seal. 12. The compressor of claim 1, further comprising a drive member for driving said orbiting member to effect said relative orbital movement between said orbiting and non-orbiting members. 13. The compressor of claim 12, wherein said drive member continues to drive said orbiting member when said seal is broken. 14. The compressor of claim 1, wherein said seal is selectively broken by a force applied by a fluid. 15. The compressor of claim 14, wherein said fluid includes a vapor. 16. The compressor of claim 1, wherein the compressor operates at substantially full capacity when in said first position and operates at substantially zero capacity when in said second position. 17. The compressor of claim 1, further comprising a controller configured to pulse-width modulate said actuation apparatus. 18. The compressor of claim 17, further comprising a sensor configured to determine a compressor operating parameter and provide said parameter to said controller. 19. The compressor of claim 18, wherein said operating parameter is a compressor load. 20. The compressor of claim 18, wherein said sensor is a temperature sensor. 21. The compressor of claim 18, wherein said sensor is a pressure sensor. 22. The compressor of claim 18, wherein said controller is configured to provide a variable duty cycle to adjust said pulse width modulation, said duty cycle being varied in response to said compressor operating parameter. 23. The compressor of claim 17, wherein said controller is configured to provide a duty cycle to adjust said pulse width modulation. 24. The compressor of claim 23, wherein said duty cycle is shorter than a time constant of a load of the compressor. 25. The compressor of claim 23, wherein said controller is configured to automatically adjust said duty cycle based on an operating parameter of the compressor. 26. The compressor of claim 17, wherein said controller is configured to produce a variable duty cycle control signal with a variable cycle time that is a function of fluctuations in pressure. 27. The compressor of claim 1, wherein said time pulsed actuation apparatus is mounted on a shell of the compressor.