The Diagnostics of the rotor misalignment of a permanent magnet motor

Abstract A mathematical model of the magnetic field in working gap a brushless motor is considered case rotor misalignment arising during manufacture, for example, due to defects end shields, or operation bearing wear. uniform (circular ring). The stator gearing taken into account on average using Carter coefficient, inhomogeneous air gap, created by magnets and winding current, assumed be plane-parallel, having two-dimensional character. It was found that associated with rotational movement eccentricity causes nonsinusoidality idle EMF pulsation electromagnetic moment frequency 3p times higher than speed. When stationary, variable induced along shaft, causing an alternating current circuit: shaft-bearings-bearing shields-stator housing. To clarify nature defect order identify actual rotor, it recommended control currents voltages specialized software hardware complexes spectrum analysis.