Magnetic field analysis, modelling and vibration control in bridge configured winding induction machines

Abstract

Technological advancement in rotating machines demands integration of electrical motors or generators in high speed flexible rotors operating at a wide range of speeds. These machines present great rotordynamic challenges and at the same time they also present great opportunities through the ability to achieve transverse actuation (in two independent directions) without any significant sacrifice. These opportunities can be tapped by developing electrical machines which can produce controllable transverse force for active vibration control and also for fully levitating the rotor. The use of controllable transverse force for vibration reduction may lead to the high operating life of mechanical components.Bridge configured winding scheme is a specialized winding scheme which can be used to generate transverse force efficiently in an electrical machine with a low power requirement along with its primary function as a motor or generator. This winding configuration consists of two power supplies and they are isolated from each other. One of the power supply is responsible for the torque production and the other is responsible for the transverse force production. However, the nature of the magnetic fields and the method of producing controllable transverse forces especially in an induction machine with bridge configured winding are not fully understood.