"Micro Cooling Fan" invention relates to the field of a miniature components, in particular, to a new type of miniature brush-less cooling fan motor. The prior art, are generally equipped with a microwave transformer, the transformer is mounted below the bottom of the cavity magnetron, when the microwave oven working for some time, the transformer temperature rises rapidly. To cool the internal components of the microwave oven, blown away steam generated by the food and the transformer, magnetron cooling, usually in a microwave oven is mounted cooling fan motor, but the existing cooling fan motor is commonly used microwave shaded pole motors, large power consumption , noisy, not consistent with the current promotion of energy conservation of the environment.