Answer / akky

Sometimes called "electrical center," it's the axial
position that the shaft/rotor assembly will attempt to
maintain during steady-state running at rated voltage and
frequency, without the influence of any coupled load.

In the usual ball- or roller-bearing machine, the shaft
position is fixed by the bearing mounting. But in sleeve
bearing motors, the bearing construction inherently permits
mechanical movement or "float" (typically 1A" or 2",
depending upon motor size). Low sliding friction allows the
shaft to drift readily back and forth to seek whatever
position is dictated by the axial forces acting on the
rotor.

what is the relation b/w KW and KWH? plz explain with example.

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I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

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what is the impedence

1 Answers   Al-Othman,

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