Electric motors-corrosion control by design

The industrial electric motor is often subjected to arduous environmental and operating conditions. It is essential for the manufacturer to be fully aware at the design stage of the surroundings in which the machine will be expected to operate so that reliability is not adversely affected. Based on typical power station experience a design life of 20 years is not unusual. This may be extended to 30 or even 40 years in some applications such as the nuclear or offshore industries for example. Here, the author describes how, in order to achieve this degree of durability in practice requires an understanding of corrosion and the way in which it can be controlled by appropriate design considerations