Abstract
It is indispensable for vertical moving by an elevator installed in a low-rise building to a skyscraper. If the elevators were established near rooms, vibration of driving motors through floor or acoustic noise might not be endured for the habitants. The more downsize motor, that is increase of flux density from the motor, and lighter motor, that is lowering elasticity of construction, are, the more claim of nuisance by users have. We analyzed these phenomena focusing on mode of electro-magnetic force by FEM and modal analysis. And then we verified this theory by experimentation. We found the vibration mode 1,2 or 3, near-by natural frequency in elevator running against electro-magnetic mode 24or12. We will express our new standpoint of reduction to the electro-magnetic vibration in this paper.
