Simplified design of PM machine for spacecraft electro-mechanical batteries

Electromechanical Batteries have important advantages comparing to chemical batteries and using them is popularized specially in Low Earth Orbit satellites recently. External rotor Permanent Magnet machines are used in these systems as Motor/Generator. Simplified parametric design method is given for PM machine design in this paper. Finite element based simulations are used to confirm design presses and show less than 7% error in parametric design that is acceptable for simple primary design.