Studies on VR Type High Torque Motor with Extremely Small Air Gaps

Abstract

It is very effective for a high torque motor to make air gap as small as possible between a rotor and a stator. By polishing the surfaces of silindrical rotor and stator impregnated with epoxi resin, we developed a high torque motor of a VR type with extremely small air gaps which has no usual bearings. The rotor and stator with smooth surface play the role as a bearing.
Analising the geometry of air gaps by MAGNAFIM, magnetic field analising softwere, we were be able to develop a motor with higher output torque density than that on the market.