Rotor Contactors |
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Rotor Contactors |
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  Aug 1 2008, 04:41 PM
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#1
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Member  Group: Full Member Posts: 57 Joined: 17-December 05 Member No.: 1,308  |
dear everbody
can any body explain why in slip ring motor rotor short circuit contactors are connected in delta (not in star). ram |
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Aug 5 2008, 12:56 AM
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#2
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 Posting Freak Group: Moderator Posts: 654 Joined: 22-February 03 From: USA, California Member No.: 285 |
They are? I have never seen that. Are you saying that you have 6 slip rings then? Because if you only have 3 slip rings as I have always seen, how would you connect in Delta?
-------------------- "He's not dead, he's just pinin' for the fjords!"
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 Aug 9 2008, 03:33 AM
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#3
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Member Group: Full Member Posts: 57 Joined: 17-December 05 Member No.: 1,308 |
QUOTE (jraef @ Aug 5 2008, 06:26 AM)  They are? I have never seen that. Are you saying that you have 6 slip rings then? Because if you only have 3 slip rings as I have always seen, how would you connect in Delta? dear jraef We have only three slip and the these are shorted thru short circuit contactors The delta connection i have mentioned is in the contactors which are used for shorting the rotors. The short circuit contactors links are made in delta and star in certain cases i would like to know the differences ram |
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Aug 9 2008, 06:54 AM
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#4
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Posting Freak Group: Moderator Posts: 2,099 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hi ram
Yes you are correct, the contactors can be arranged such that each pole shorts ring to ring, or connect each pole between a ring and a virtual star point. The difference between the two connections, is the voltage across the contactor poles when the contactor is open, and the current through the poles when the contactor is closed. The voltage in the delta connection is root three higher than in the star connection. Best regards, Mark. -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Aug 10 2008, 12:04 PM
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#5
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Member Group: Full Member Posts: 57 Joined: 17-December 05 Member No.: 1,308 |
QUOTE (marke @ Aug 9 2008, 12:24 PM) Hi ram Yes you are correct, the contactors can be arranged such that each pole shorts ring to ring, or connect each pole between a ring and a virtual star point. The difference between the two connections, is the voltage across the contactor poles when the contactor is open, and the current through the poles when the contactor is closed. The voltage in the delta connection is root three higher than in the star connection. Best regards, Mark. Dear Mark thanks for your reply, kindly let me know which connection would be advantageous If he have a motor with rotor voltage 1455v and 1105 amps what is the contactor voltage/current rating if it is used in star delta thanks ram |
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