A Simple Method to Estimate Eccentricity Effects on Radial Flux Permanent Magnet Machines

Radial flux permanent magnet machines are of widespread use in several applications, particularly in highperformance applications since permanent magnets offer highefficiency in a wider range of power and working speed. Electrical machines suffer from several mechanical imperfections such as manufacturing tolerance and eccentricity, the latest become more critical in high-speed operation. Eccentricity is a phenomenon affecting particularly radial flux machines introducing mechanical vibrations, reducing the machine efficiency, and even lead to motor failure. This article provides with a mathematical approach to estimate the airgap magnetic flux density of radial flux permanent magnet electrical machines.