ANALYSIS OF THE EFFECT BETWEEN THE STATOR WINDING AND THE MAGNET'S MAGNETIC FIELD DENSITY ON THE WORKING POINT DURING THE TRANSITION

Abstract

In this paper, the electromagnetic properties of external rotor permanent
magnet motors are analyzed and modeled. The magnetic flux density at the
magnet's working point has a significant effect when interacting directly with
the armature current to produce torque. It is analyzed according to magnetic
material properties and number of conductors in the motor stator windings.
Both factors are required to accurately predict the magnetic flux and moment
distribution when demagnetized. The author focuses on analyzing the
magnetic flux density at the working point to limit the risk of complete
demagnetization leading to motor damage. Finite element analysis (FEM)
method is used to verify the analytical model. The obtained results are a key
factor in optimal magnet design.