GYROSCOPIC DYNAMICS AND CONTROL

PRINCIPLES OF FLYWHEELS SUPPORTED

BY ACTIVE MAGNETIC BEARINGS
　

ZHANG Kai¹  ZHANG Xiaozhang¹  ZHAO Lei²  ZHAO Hongbin¹

(1. Department of Engineering Physics, Tsinghua University, Beijing 100084; 
2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084 )

Abstract: Through the study of gyroscopic dynamics of a flywheel rotor system supported by active magnetic bearings, and the analysis of the influences of magnetic forces to the nutation and the precession of the rotor, the effects of the magnetic forces to the rotor are divided into four basic supporting com-ponents. Their different influences to the stability of the nutation and the precession are discussed respectively. The proportion of the four components can be adjusted by a controller to change the damping characters of the nutation and the precession, and achieve a high speed operation. Based on the study, the principles of controller designs for flywheel systems sup-ported by active magnetic bearings are summarized, and they provide a direction for designing effective controllers for the systems at high rotation speeds.

Key words: Active magnetic bearing Flywheel Gyroscopic dynamics Control principles

CLC No: TH133.3

Received 20060517, received in revised form 20061221