Optimum design of an eight pole electromagnetic bearing

Abstract

Abstract The paper aims to give the step by step design procedure of an electromagnetic bearing having eight pole for machine tool applications having the shaft diameter of 20 mm and rotate with the speed of 750 rpm. The mathematical procedure consists of the geometrical as well as constraints due to losses occur in the electromagnetic bearing which makes the designing more accurate. Finally, optimization has been done to get the optimum values of the dimension of the electromagnetic bearing. By interior trust method numerical optimization has carried out to find out the optimum values of the dimensions of an electromagnetic bearing to maximize the electromagnetic force exerted by it. This has supported by a CAD model using Solid Works showing the dimensions of the model. The mathematical model compared with the available literature on electromagnetics bearing and found to be an effective with consideration of all iron and copper losses. The results show the designed bearing can produce a magnetic force of 166 N from each electromagnet on the shaft. For the application an electric hand drill machine has to be taken and an electromagnetic bearing consists of 8 electromagnets has been designed which is capable of generating 29 N of electromagnetic force onto the shaft of the electric hand drill machine.