Power electronic modules are subject to a variety of temperature profiles caused by cyclic thermo-mechanical stress on joints causing device failure. This paper shows how the life time cycle of the power electronic converter is affected in a fuzzy speed controller for a brushless DC motor drives (BLDC). Although there are several papers that show the performance of fuzzy logic speed controllers, there are not enough papers that show how the life time in power electronics is affected according to the power electronic stage losses. Thus, the losses in the power electronic stage are not included into the design of the controller. As a result, the industrial process in which brushless motor drives are installed, decrement their life time. This paper estimates the lifetime cycle in the power electronics stage when a fuzzy logic speed controller is implemented in BLDC. The analysis is based on co-simulation between LabVIEW and Multisim to calculate the response, stablished by the fuzzy logic controller, of temperature because to power losses conduction/switching of the semiconductor (IGBTs), on power electronic stage and the speed control. A comparison between a conventional linear controller and a fuzzy logic controller also is conducted and the results show a superior response in the speed response. In addition, the losses in the power electronic stage are reduced when the fuzzy logic speed controller is implemented. Hence, the fuzzy logic design is evaluated according to the speed response and lifetime in the power electronic stage.