Patent ID: 7779640
Filing Date: 2010-08-24
Classification: F25B

Abstract:
1. A linear oscillating cryocooler comprising: a first motor that drives axial linear movement of a first linear oscillating mass, the first motor having a main drive winding and a separate trim winding separate from the main drive winding, the main drive winding being driven and arranged to cause linear oscillation of the first mass, the separate trim winding being driven and arranged to provide either an increased or decreased amount of controlled linear movement of the first mass so as to reduce a vibration of the first motor; a second motor that drives linear movement of a second linear oscillating mass using at least one winding of the second motor, wherein one of the first mass or the second mass is a balancer for the other of the first mass or the second mass; and a motor controller that outputs a main drive signal that is coupled to the main drive winding, and a separate vibration reducing signal that is coupled to the separate trim winding, wherein a collective effect of the main drive signal on the main drive winding and the vibration reducing signal on the separate trim winding moves the first mass so that the first mass moves in a counter-balancing manner relative to movement of the second mass, and the first mass has reaction against inertia of the second mass to reduce vibration of the cryocooler assembly as a whole.