E-motor Start-up Current

Posted in: , on 1. Sep. 2009 - 16:07

Hi All,

If we start an e-motor with the following characteristics with DOL method (with out any load, ie not connected to any load) what is the maximum current absorbed by the emotor in the start-up?

110 kW

locked rotor current : 760% of FL current

Full load current : 185 Amps ■

Best Regards, [I][B]Alex Kaveh Senior Mechanical Engineer Mobile : 0451 563 155 Email : [email]alexkaveh@gmail.com[/email][/B][/I]
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Re: E-Motor Start-Up Current

Erstellt am 1. Sep. 2009 - 02:58

Dear Alex,

The maximum current (disregarding the magnetic inrush current) is:

760/100 * 185 = 1406 Amps. at the initial scwitch on.

After the e-motor takes up speed, the consumed current decreases down to no load current at maximum rpm.

Can also be determined with the spreadsheet.

BR

Teus ■

Teus