Shaded pole induction motor

QuickField simulation example

Problem Type
Plane-parallel problem of nonlinear AC magnetics.

Geometry
Axial length is 19 mm

Given
Coil current 400 Ampere-turns, frequency 50 Hz.
Rotor cage electric conductivity 37 MS/m.
Copper rings electric conductivity 56 MS/m.
The BH-curve for the steel core:

Task
Calculate the stall-torque of a single phase shaded pole induction motor.

Solution
The electrical circuit specifies how to connect the ring ends and the bars of the squirrel cage.
The shading ring is actually a rectangle. Only two of the rectangle's sides are shown in the geometry model. The front and back sides of the rectangle cannot be included in a 2D geometry model. The material conductivity is reduced to account for the resistance of these components.

Results
Maxwell torque is 21 mN*m.

Reference: Wikipedia Shaded-pole motor

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