Motor manufacturers go to great lengths to design, build and test their motors to comply with applicable NEMA and IEC guidelines. In nearly all cases, customers can be assured that a motor provided by a name-brand manufacturer will meet their needs IF properly specified, installed, and maintained. Because applications vary so widely, sometimes that “IF” can be a big one. There are many design and installation considerations, mechanical as well as electrical, which must be clearly understood and adhered to for a successful application. Let’s examine some of the more typical mechanical considerations and how they might affect your motor application. By the way, much of which follows is referenced against NEMA guidelines; however, the same general concepts apply whether US domestic or international standards apply.
- Ambient considerations: NEMA MG 1, American National Standard for Motors and Generators, specifies usual service conditions under which motors are designed to operate. These include an upper ambient temperature rating of 40C, above which adequate cooling is difficult to provide and the motor internal components are at greater risk of exceeding operating temperature design limits. This is important because it has been estimated that for every 10C above design […]