Study On The Constant Current Biased Magnetic Bearing

This paper study the constant current biased magnetic bearing,whose components of electric system and mechanical system,advantages and disadvantages are introduced in this paper.Compared with the Permanent Magnet Biased Magnetic Bearing,It can reduce the power consumption,and its structure is more simple than the conventional active magnetic bearing.According to the constant current biased magnetic bearing,this paper proposed two kinds of coil-wrapping,it is very important to estimate the distribution of magnetic flux.In this paper,as different wrapping of coil are concerned,two methods of detecting the air gap flux density are analytic in detail.The simulation results verify that each magnet has two coils on it whose magnetic modality is perfect.As to two degree of freedom of the constant current biased magnetic bearing,large numbers of experiment results are put up.They show it which can suspense stably due to the rotor disturb,whose rotor can be at the center position with variable connection of the control coil such as in series or parallel connection,whose vibration is different from the conventional active magnetic bearing with the same load capacity.At last,this paper compare the three kinds of power consumption with each other.Finally,it points out that the power consumption of the constant current biased magnetic bearing is less than the conventional active magnetic bearing,it can reduce the cost and improve efficiency.The paper laid foundations for the further study of the five degree of freedom of the constant current biased magnetic bearing .