This paper describes the manufacture of injection molding plastic magnetic bearings. The polarity of the inside ring face is different from that of the outside ring face in one bearing. Those bearings rotate without contact bearings. If such bearings can be of practical use, the noncontact bearings should be in clean room and space environments where lubricating oils can not be used. This first paper was written primarily discuss the principle of plastic magnetic bearings regarding the injection mold method of magnetization and measurement of flux density. It was possible to put the injection molding plastic magnetic bearings to practical use in this experiment.
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