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Efficiency improvements attainable with permanent magnet motors have been well documented. Some permanent magnet motors have been equipped with an induction cage in the rotor to allow direct on line starting. Designs of this type have been referred to as line start permanent magnet motors. A topic that has not received much attention is the use of this type of motor with an adjustable speed drive...
In recent years, engineers have been redesigning the protection schemes for electrical installations to reduce the arc-flash hazard associated with switching and maintaining equipment. For electrical fire pumps, however, National Fire Protection Association (NFPA) 20, Standard for the Installation of Stationary Pumps for Fire Protection, prescribes very strict requirements for reliability of the power...
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