No abstract

An active magnetic bearing system can support rotating shafts without any mechar 直cal contact ． Therefore it has been used such as an ultra ・ 10w temperature ， a vacuum ， and a clean envh ℃ nment ． Tb reahze the downsizing of the syste 皿 and the high ・ speed rotation ， a 2 ・ axis and 5 − axis self 」 bearing nlotor has been proposed ． In this paper， a consequent ・ pole type se聾 bearing motor is proposed ． 1七 is possible to control the rotor position without the inf(》rlnation of the rotating angle ． The radial control forces and cogging torques are analyzed using 3 dimensional finite element method ． The results show the improvement of the error angle and the cogging torques by changing the model shapes ．