Since the invention of the direct current machine in 1837, the first patent field on AC machine was in 1887. With the advent of power electronics, several improvements have been made to the performance and efficiency of electrical machines. In recent years , new constraints have been imposed on the manufacturers of electrical machines. The first regulation imposes a limitation of the acoustic noise. The second constraint is economic, imposed by operators who want to minimise costs resulting from materials maintenance. The third constraint is technical and targets increased performance of the machines while minimising the impact on the environment.
So, applying an optimal Skew angle reduces torque ripple and cogging torque which thus reduces the noise and vibration on the motor.
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