This paper will give out a flexible calculation and design of electric motor by coupling Matlab program for analytical calculation and FEMM simulation for magnetic design. Currently, there are several EM designs such as JMAG, Anasys and Motor-CAD(SPEED) well known used in EM design companies. For some special permanent magnetic and squirrel cage rotor design, it is difficult for EM designer to apply this commercial software to obtain stator and rotor laminations. An auto coupling program of MATLAB and CAD was implemented to determine a line-start permanent magnet LSPM Motor. The LSPMSM design is based on both analytical and FEMM models to maximize efficiency of LSPMSM motor configuration. The magnetic sizes and geometry parameter of stator and rotor are determined by Matlab and export drawing to Auto CAD program. This paper is also taking account practical manufacturing factors to minimize mass production cost. The analytical program, FEMM simulation and test results have been compared and validated and good agreement.