Tapered Stator Teeth Reduce Magnetic Saturation in Electric Motors

The tooth geometry is modified locally by tapering the tooth width from the outer section toward the inner section. This creates non-uniform local properties where the tooth is wider at the outer section and narrower at the inner section, allowing different regions to serve different functions: the wider outer section accommodates high current density windings while the narrower inner section reduces magnetic saturation in the tooth root region.

The tooth width parameter is changed along the radial direction, transitioning from a constant width to a variable width that decreases toward the inner section. This parameter variation allows the tooth to maintain structural integrity while reducing the magnetic path area at critical locations, thereby reducing magnetic saturation and enabling higher torque output.

Instead of uniform parallel flanks, the tooth flanks are designed with varying slopes: the outer section has a larger included angle while the inner section has a smaller included angle. This creates local quality variations that optimize magnetic flux distribution, reducing saturation at the tooth root while maintaining adequate space for windings at the outer section.

The tapered geometry is built into the tooth structure during manufacturing, preliminarily shaping the magnetic flux paths to avoid saturation before the motor operates. This preventive design approach eliminates the need for complex post-processing or operational adjustments to mitigate saturation effects.