Effect of magnetic wedges on electromagnetically-induced acoustic noise and vibrations of electrical machines

The articles studies the effect of stator magnetic wedges on the electromagnetically-induced acoustic noise and vibration of a squirrel cage induction machine. Firstly, a review of previous studies analysing the effects of magnetic wedges both on electromagnetics and vibro-acoustic domain is done. Then, simulations are performed with MANATEE (R) software to quantify the reduction of noise and vibrations due to Maxwell forces with the use of magnetic wedges in a squirrel cage induction machine presenting a strong resonance due to slotting effect. A sensitivity study is carried on the magnetic permeability of the wedge and it is shown that the maximum sound pressure level and vibration reduction only reaches 2 dB with a relative magnetic wedge permeability of 20.