i have a motor with no name plate and is a 22kw. how can i find the amperage of the motor?

stevejubel [at] yahoo.com

 

Roughly

VA = Watts/Volts.

Regards,
cww

 

The formula for KW is

Line Volts x Line Amps x Power factor x Root 3 (1.732) / 1000

22 x 1000
-------------------- = Line Amps
1.732 x Line Volts

 

Quite right, a 22kw motor would most likely be 3 phase. I apologize.

Regards,
cww

 

i guess your calc is not correct because there is Power Factor else to Know the Amp.

W= V * A * P.F * 1.732

i am sure this formula

 

Maint Wrote "i guess your calc is not correct because there is Power Factor else to Know the Amp"

Yes, you are correct, I had PF in the first line but missed it in the formula

Regards
Roy

 

Stephan... a simple procedure for determining the approximate rated-current of a 3-phase motor, knowing only rated output-power, kWo, and rated-Voltage, V, follows:

1. Convert kW to Hp, Hp = kW/0.746 = 29.5.

2. Round-off to nearest integer size, say 30 Hp.

3. Let input kVA = Hp.

4. Then, rated-current, A = 1,000 x kVA/[Sqrt(3) x V]

Regards, Phil Corso (cepsicon[at]aol[dot].com)