Rare-Earth Servomotors: Not For Every Application

Today there is interest in the advantages of rare-earth AC servomotors, however, they are not right for all applications. In fact, the majority of all applications would best be "productively" served by the more common ceramic magnet servomotor. In the rare-earth/ceramic debate, spec sheets don't tell enough.

Rare-earth AC servomotors have their merits and their pitfalls. Although we can point to some generalities, their operating characteristics need to be considered for each individual application. But first let's take a look at what rare-earth servomotors are and why they're more expensive than ceramic magnet ...