Previous in Forum: Engineering masquerading as art installation masquerading as Christmas lights   Next in Forum: battery
Close
Close
Close
3 comments
Rate Comments: Nested
Anonymous Poster

SINGLE PHASE INDUCTION MOTOR

11/20/2007 8:37 PM

I NEED HELP WITH THIS....

When operating at rated load, a 120 VAC 60HZ single phase induction motor can be modeled as a 10.8 ohm resistor in series with a 25.3 millihenry inductor. Under these conditions, what will be the power factor?

Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
Power-User

Join Date: Oct 2007
Location: Hartwell Georgia N34* 56.770 / W83* 35.431
Posts: 222
Good Answers: 1
#1

Re: SINGLE PHASE INDUCTION MOTOR

11/21/2007 8:04 AM

Somebody correct my math, but I get PF=.757

XL= 2iifL = 9.3

Z = 14.25

I = 8.42 amps

theta = 40.73

cos theta = .757

Good luck,

James

__________________
" adapt, improvise, overcome "
Reply
Anonymous Poster
#2
In reply to #1

Re: SINGLE PHASE INDUCTION MOTOR

11/21/2007 11:31 PM

You should know better than to temp the gods by saying "Someone correct my maths.."

2iifL = 2 * ii * 60 * 25.3 *10^-3 = 9.54 ohm

giving

PF = .75 ffej

Reply
Anonymous Poster
#3

Re: SINGLE PHASE INDUCTION MOTOR

11/22/2007 1:11 AM

cosΦ=pf= r/sqrroot(r2+w2l2)=10.3/√(10.3)2+(25.3*.001)2(60)2

Reply
Reply to Forum Thread 3 comments

Previous in Forum: Engineering masquerading as art installation masquerading as Christmas lights   Next in Forum: battery

Advertisement