--%> --%>

Switched Reluctance Motor: Comparing FEA with RSM

Motors and generators with MagNet

This application analyses a switched reluctance motor using two different methods: the MagNet Transient 2D with Motion solver, and a circuit simulator with a response surface model (RSM) created with the System Model Generator.

The device is set up so that the coils are switched depending on the position of the rotor. The analysis starts with the rotor stationary and at 10 degrees from the aligned position. A voltage source is switched on at t=0.01 seconds, the rotor gradually accelerates, with the applied voltage switched between the coils every 30 degrees of rotor rotation.

SRM created in MagNet 2D/3D

METHODS and RESULTS

RESPONSE SURFACE MODEL for the SRM's TORQUE

A plot of the response surface model for torque created by the System Model Generator and used by the circuit simulator. A total of 120 solutions were required to generate this model.

View larger image

COMPARING CURRENT in the COIL

This graph shows the current in the first pair of coils (one at 45 degrees and the other at 225 degrees) as a function of time. The results from the Transient 2d with motion (black trace) compares well with the circuit simulator's output (red trace), in particular since that the switching time depends on position.

View larger image