Linear electric motor - QuickField simulation example
Engineering question
How to calculate the propulsion force exerted on the rail by a linear induction motor?
Answer
Model one periodic three-slot section with odd-periodic side boundaries, solve the AC-magnetic field, and integrate the electromagnetic force acting on the rail.
Typical applications
linear induction motors, rail propulsion motors, electromagnetic transport drives
Download
- Download simulation files (files may be viewed using any QuickField Edition).
Simulation problem
Problem TypePlane-parallel problem of AC magnetics.
Geometry
Given
Core magnetic permeability μ = 1000;
Conductivity of rail σ = 33 MS/m;
Total current in the slot I = 1844 Ampere·turns (R.M.S.);
Frequency f = 50 Hz.
Task
Propulsion force acting on the rail of a linear electric motor for the specified excitation current, geometry, and magnetic material properties..
Solution
Due to periodicity of the problem, only the 3-slot section is modeled, and the odd periodic boundary condition is applied on the sides.
Results
Propulsion force is 145 N per 1 m of rail length in z-direction.
Current density distribution in the rail:
Video
- Linear electric motor
Watch on YouTube. - View simulation report in PDF