Shaded pole induction motor - QuickField simulation example
Engineering question
How to find stall torque of shaded pole induction motor?
Answer
Set up a plane-parallel QuickField AC Magnetics problem for a shaded pole induction motor and evaluate stall torque from computed field results.
Typical applications
shaded pole motors, appliance induction motors, fractional power motors
Download
- Download simulation files (files may be viewed using any QuickField Edition).
Simulation problem
Problem TypePlane-parallel problem of 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