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munguni
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Join Date: Jun 2012
Posts: 6

Machine Design Problem

02/04/2013 10:20 AM

how do i calculate the diameter and the length of the dc generator if i am given the number of poles, voltage, power, speed ,B, ac and the number of slots.
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Anonymous Poster #1
#1

Re: machine design problem

02/04/2013 10:31 AM

Diameter = number of poles x B.

Length = current x speed ÷ number of slots.

You don't need the other parameters.
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PWSlack
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#2
In reply to #1

Re: machine design problem

02/04/2013 10:39 AM

Units and conversion factors?

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Anonymous Poster #1
#3
In reply to #2

Re: machine design problem

02/04/2013 11:58 AM

Oh, indubitably!
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7anoter4
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#4

Re: Machine Design Problem

02/05/2013 11:53 PM

You have to choose lambda=length/tau tau=pi*D/(2*p) D=rotor diameter; pi=3.14159…

2*p=no.of poles Usually 1 >=lambda>=0.5 [lambda=0.75].

D=6+5*(Pi*p/n/lambda)^(1/3) [cm]

Pi=inner power [w]; n=rpm ; Pi=[approx.](1+eff)/2/eff *Prated

eff=efficiency [=0.8-0.95]; p=no. of poles pair

length=lambda*tau

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