Maurice Tutor

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Teaching Since: May 2017
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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 17 Jan 2018 My Price 6.00

low hysteresis

4-8. In the early days of ac motor development. machine  designers had great difficulty controlling the core losses (hysteresis and eddy currents) in machines. They had not yet developed  steels with low hysteresis, and were not making laminations as thin as the ones used today. To help control  these losses, early ac motors in the United States were  run from a 25-Hz ac power  supply, while  lighting  systems were  run from a separate 60-Hz ac power supply.

(a)   Develop a table showing the speed of magnetic field rotation in ac machines of 2, 4, 6, 8, 10, 12, and 14 poles operating at 25 Hz. What was the fastest rota­ tional speed available to these early motors?

(b)   For a given motor operating at a constant flux density B, how would the core losses of the motor running al 25 Hz compare to the core losses of the motor running at 60 Hz?

(c)    Why did the early engineers provide a separate 60-Hz power system for lighting?

 

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Maurice Tutor
(5)
Status NEW Posted 17 Jan 2018 10:01 PM My Price 6.00

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