Patent ID: 9077214
Filing Date: 2015-07-07
Classification: F04D,F16C,H02K

Abstract:
1. A magnetic bearing control device in which eddy current gap sensors that are provided on an X-axis and a Y-axis of an XY coordinate system detect gaps between the eddy current gap sensors and a controlled shaft that is lifted by a magnetic bearing, and in which, based on the detected value, an X-axis electromagnet and a Y-axis electromagnet are excited to levitate the controlled shaft using magnetic forces of the electromagnets, the magnetic bearing control device comprising: a first function for detecting an X-axis direction movable limit position of the controlled shaft; a second function for identifying a center of an X-axis movable range of the X-axis eddy current gap sensor based on the X-axis direction movable limit position detected by the first function; a third function for detecting a Y-axis direction movable limit position of the controlled shaft; a fourth function for identifying a center of a Y-axis movable range of the Y-axis eddy current gap sensor based on the Y-axis direction movable limit position detected by the third function; and a fifth function for turning an excitation current of the Y-axis electromagnet OFF when the first function detects the X-axis direction movable limit position and the second function identifies the center of the X-axis movable range, and turning an excitation current of the X-axis electromagnet OFF when the third function detects the Y-axis direction movable limit position and the fourth function identifies the center of the Y-axis movable rage.