A mechanism of motor failures

Since the invention of the hermetic system by placing the motor inside the compressor case, motor reliability has been even more important for at least three reasons. First, the motor and its insulation system must resist the chemical effects of the refrigerant and the compressor lubrication oils. Second, the motor became considerably less accessible and therefore, very costly to replace and service. Third, if a failure does occur, the destruction of motor construction materials such as copper, steel, and insulation components can cause large quantities of foreign materials to be deposited within the system. These reasons don´t even consider the inconvenience caused to the customer through loss of the system or delays in repair.