Abstract
In a bearingless motor for vibration suppression of a flexible shaft, a control system of a suspension part can be simplified. In this paper, it is shown that induced voltage at suspension winding terminals, caused by mutual couplings between motor winding and suspension winding, provides current flow in suspension winding, generating damping and spring forces, which suppress flexible shaft vibration. Controllers and inverters are not required at suspension terminals but these terminals are simply short-circuited.
