Automatic frequency controlled motor backdrive

摘要

In a horizontal centrifuge, a bowl rotates in the same direction as a screw internally of the bowl. The bowl and screw connect to a three input gear box which rotates the bowl and screw at a small differential, or the scrolling rate. A separate motor running at a variable rate connects to the third gear box input and thereby reduces the scrolling rate. A feedback loop connects to the motor to vary the motor speed so that the scrolling rate is varied. A maindrive motor rotates the bowl which then couples through the gear box to rotate the screw and thereby furnish the power to rotate the bowl and screw.