Research on electromagnetic noise of submersible motors with a radial skewed slots rotor

Skewed slots are widely used in many industrial applications because they can effectively reduce electromagnetic vibration and noise. In order to eliminate axial electromagnetic force in ordinary skewed slots rotor, a double skewed slot was proposed, which can useful reduce axial electromagnetic force and is superior to traditional skewed slots on reducing the electromagnetic vibration and noise. However, it still suffers from the problem of the difficult manufacturing process in largesized submersible motors. In this paper, a radial skewed slot to reduce the electromagnetic vibration and noise is proposed, which has the advantages of a simple manufacturing process and obvious effect about reducing noise. Large-sized submersible motors are noisier than ordinary motors but lack effective means to reduce electromagnetic vibration and noise. So this paper adopts 2-D FFT and multi-physics coupling analysis method to analyze and compare the performances of the straight slot and the radial skewed slot in large-sized submersible motors.