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No Load Current, Motor |
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 Nov 1 2009, 08:24 AM
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#1
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Intermediate Member  Group: Full Member Posts: 15 Joined: 16-December 08 Member No.: 5,027  |
Hi,
I have a 500 kW 400 V slip ring motor driving a load. The current drawn by the motor without load but still couple to the drive is very high, 750 Amps. This is too high for an unloaded motor. This should be the current drawn under loading conditions. What basically could be cause of the high current ? Thanks. Bob |
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Nov 10 2009, 07:49 AM
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#2
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Posting Freak Group: Moderator Posts: 2,383 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hi Bob
Yes, that sounds very high. Assuming that the motor is running with the rotor shorted and is at full speed, that current suggests a lot of energy going somewhere, either out the shaft as a mechanical load, or as losses in the motor. If the motor losses are that high, the motor will not last long so you need to determine the cause pretty quickly. I would strongly recommend decoupling the motor from any load and retrying. Is there a possibility of a star designed stator connected in delta? 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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