A device for driving a motor includes inverters, an interrupter, and a controller. for 10 seconds and withdrawn, a heat shrinkage in the main-shrinkage direction is 30% or more and a heat shrinkage in the direction orthogonal to the main-shrinkage is 10% or less. Consequently, the thermal stability and mechanical properties of the polymers can be dramatically elevated with the incorporation of these fibers. In one example, an ultrasonic transceiver can be used to perform the inspection. A coating layer is formed on the outer skin, with at least a portion of the plurality of lobes formed within the thermal barrier coating.