Shaded pole induction motor
Locked-rotor torque of a single-phase shaded pole induction motor, computed from the magnetic field and induced rotor currents with the rotor stationary.
Engineering Problem
How can the locked-rotor torque of a shaded pole induction motor be found?
Answer
Build a plane-parallel AC Magnetics problem and evaluate the locked-rotor torque from the computed field results.
Typical Applications
- Shaded pole motors
- Induction motors in household appliances
- Low-power motors
Simulation Problem
- Problem Type
- Plane-parallel AC Magnetics
- Geometry
- Axial length 19 mm, stator 68 mm × 19 mm.
- Given
- Coil current 400 ampere-turns, frequency 50 Hz
- Rotor cage conductivity 37 MS/m
- Copper ring conductivity 56 MS/m
- Steel core B-H curve is given
- Task
- Compute the locked-rotor torque of the single-phase shaded pole induction motor.
- Solution
An external circuit is used to specify how the squirrel-cage rotor's end rings and bars are connected.
The shading ring is actually a rectangle, and the geometric model only shows two sides of this rectangle — the front and back sides cannot be included in the 2D geometric model, so the material conductivity is reduced to account for the resistance of these two parts.
- Results
Maxwell torque 21 mN·m.
