DC motor starting problem

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Thread Starter

P.Samuthira Pandi

Dear members,

I need a help from you.

We have a DC Series motor of rating 3.7 KW rated for 220V DC. The starting resistances are 3.5 ohms, 1.5 ohms and 0.5 ohms connected in series. The starting time is 3.5 secs. How to cut the resistances and at what sequence?

the timing sequence given by vendor is 2, 0.5, 0.2 secs.

Please give some solution for this problem.

Regards,
P.S.Pandi
 
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Phil Corso, PE

Responding to P.S. Pandi's Jan 31, 11:04pm query... I have references that can be useful:

Years ago I taught the subject in a NYC-Community college. Two very good texts were used:

1) I.L Kosow
"Electric Machinery and Control"
Prentice-Hall
Library of Congress No. 64-22802.

2) Rosenblatt & Friedman
"DC & AC Machinery"
McGraw-Hill
Library of Congress No. 62-18861.

If you are unable to obtain the texts I will send the pertinent pages!

Regards,
Phil Corso, PE {Boca Raton, FL, USA}
[[email protected]] ([email protected])
 
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