The invention includes a cooling fan set for refrigerating the airflow in an electric storeroom; a transmission for transmission of drive force to the fan set; a convector fan for transmitting the heat generated by heater to the pocket of microwave oven with the drive of the transport. The drive system in this invention has no drive motor and drives the convector fan and the cooler fan only by a convector motor, so that the noise, the quality of component and the cost are reduced, and the efficiency of products is improved. |