Thermal dissipation in electrical machines causes heat generation and temperature rise in their various components, and these factors reduce the life of the machine . Increasing the temperature in the machine can damage the coil insulation, which in turn causes unallowed thermal stresses, sound noise, reduction of efficiency, and even allowed tolerance changes. On the other hand, the thermal resistance of the engine causes reduction of the temperature and better heat transfer in the engine. Therefore, the prediction of the electric motor’s temperature behavior can help us design the cooling system of our electric machine optimally. Reliable switching motors had attracted a lot of attention because of their unique properties. In this project, the thermal analysis of the reluctance switch electric motor is considered in a three dimensional and steady state manner. In which the air gap between the rotor and the stator is modeled with the help of computational fluid dynamics. The software used in this simulation ANSYS-CFX is suitable for simulating rotating objects. The obtained results are for the rotational speeds of 1000, 1500, and 2000 rpm for a 12/8 reluctance switch motor. The simulations illustrate that the maximum temperature for the rotational speed of 1000 rpm is equal to 343/ 1K (or 70/1?c)in the coil, and for 1500 and 2000 rpm, the maximum temperature in the motor’s rotor are 348K (or 75 ?c ) and 350.4k (or 77/4?c ) respectively. This is due to the reduction of copper losses in the coil and losses growth in the stator core and the rotor.Reduction of stator and rotor core losses due to increased frequency and maximum magnetic flux and reduction of copper losses due to high voltage rise at high speeds. Finally, the engine’s temperature contours that provide a precise temperature distribution across the engine, are mentioned as well. Keywords: Electric motor, Computational Fluid Dynamics, reluctance switch , Heat transfer , Thermal loss