LRK Motor Analysis

These notes describes how one might go about analyzing Lucas, Retzbach and Kühfuss (LRK) motors, also known as Split Phase Sector (SPS) motors. These motors are an elegant type of brushless DC motor.

The files included in this example are:

lrk-bldc.mcd: a Mathcad 2001i worksheet for analyzing LRK motors
lrk-bldc.pdf: a PDF printout of lrk-bldc.mcd
lrk.fem: a finite element model of the geometry considered in lrk-bldc.mcd
flux.lua: a Lua script that runs in FEMM 4.0 that analyzes flux linkage and cogging torque over a range of rotor angles and saves the results for all rotor positions to disk.
flux_femm42.lua: a version of flux.lua for FEMM 4.2.
flux.m: a translation of flux.lua script that runs in Octave using the OctaveFEMM package.
flux-results.mcd: a Mathcad 2001i worksheet for doing some further analysis on the results obtained via the flux.lua script
flux-results.pdf: a PDF printoutof flux-results.mcd

All files can also be downloaded as a single archive.