Patent ID: 8302409
Filing Date: 2012-11-06
Classification: F04B

Abstract:
1. A cryopump control apparatus comprising: a first temperature detector configured to detect a temperature of a first cooling stage of a cryopump; a second temperature detector configured to detect a temperature of a second cooling stage of the cryopump; a reversible motor being configured to drive a first stage displacer of the first cooling stage and a second stage displacer of the second cooling stage; a controller configured to receive a detection of the temperature of the second cooling stage and control the temperature of the second cooling stage by controlling the speed and direction of rotation of the reversible motor, the controller also configured to receive a detection of the temperature of the first cooling stage, and, in the case that the temperature of the first cooling stage rises above a first critical temperature, reduce the temperature of the first cooling stage by controlling the speed and direction of the reversible motor, in the case that the temperature of the first cooling stage falls below a first returning temperature, increase the temperature of the first cooling stage by controlling the speed and direction of rotation of the reversible motor, and, in the case that the temperature of the second cooling stage reaches a second stage target temperature, stops the rotation of the reversible motor, wherein the controller is operative during regenerating both of a first panel connected to the first cooling stage and a second panel connected to the second cooling stage by rotation of the reversible motor in a reverse direction.