30.6 Permanent-Magnet Brushless DC Motor Drives
30.6.1 Machine Background
Anyone studying electric machines would be aware that the classical synchronous machine offers the possibility of the very highest efficiencies. These machines have the current-carrying conductors in the stationary part; therefore, there is no need to transfer high power through a brush system. The field is provided on the rotating part either by an electromagnet, which does require some very low-power brushes, or, at best, by a permanent magnet with no power requirements at all.
This is clearly better than the traditional dc machine with high-power brushes and rotating conductors, with those conductors having a very poor path for heat to get away under overload conditions. ...
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