Excitation controller of magnetic bearing

Abstract

Abstract PURPOSE:To obtain stable attractive force of a bearing, by differentially exciting a magnetic bearing in accordance with a change of AC power in reluctance between a fixed iron core, mounted to a stator side, and a rotary iron core, mounted to a rotor side. CONSTITUTION:A rotary iron core 12 in a detector unit 8, detecting a change of height in a rotor shaft, is fixed with its center 13 to a main shaft 6, and a fixed iron core 11 is set to the stator side of an electric machine, while a primary winding 14 and secondary winding 15 in the detector unit 8 are both arranged to the fixed iron core 11. Further an air gap 17 is provided between the fixed iron core 11 and the rotary iron core 12. Then the primary winding 14 in the detector unit 8 is connected to a power source 7, and the secondary winding 15 is connected to a control winding 10 through a rectifier 9. This control winding 10 and an excitation winding 3 are arranged in such a manner as to reversely flow an electric current, and attractive force of a magnetic bearing can be generated by a difference between magnetic flux formed by the excitation winding 3 and magnetic flux formed by the control winding 10.

Inventors

• 👤 Masayoshi Muraoka
• 👤 村岡　政義

Bibliographic Details