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Join Date: Jun 2013
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Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/07/2014 5:10 AM

I have read some where on the net that some energy being wasted in the resistance starters for big slipring motors can be recovered by means of some inverter circuits in the starter rotor circuit. I need some information if some equipment is manufactured and available and is really beneficial to use.

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Guru
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#1

Re: Saving energy on big slipring motors using recovery systems

05/07/2014 5:39 AM

So pick up the phone and talk to a few inverter manufacturers.

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#2

Re: Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/07/2014 9:49 AM

Allergic to telephones, are we?

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Guru

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#3

Re: Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/07/2014 11:14 AM
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Guru
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#4

Re: Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/07/2014 2:45 PM

There are several companies making these, but they are getting to be fewer and fewer because people are not using slip ring (wound rotor induction motors) as much any longer.

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Guru

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#5

Re: Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/08/2014 12:25 AM

Slip ring motors are becoming scarce.

Unless it is a particularily large motor (1,000's of hp) it would not be worth while installing a "one off" system.

I studied slip energy recovery back in the 70's, and only once ran across one system that actually used it in all the following years of my career in variable speed drive control. It does allow for some energy recovery, but with the new energy efficient motors and VSD's I doubt you will match the efficiency of a new motor drive system.

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Member

Join Date: Jan 2014
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#6

Re: Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/08/2014 2:55 AM

What is the application ..

And what is the capacity of motor ..

Presently which type of system is in operation ...

Why did you chosen Slip ring Motor ...is it for High starting torque or is it for Speed control or is it for with standing kick loads ???

Which industry it is installed ...

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Guru

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#7

Re: Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/08/2014 6:23 AM

This CR4 discussion may give you a clue.

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Guru
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#8

Re: Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/09/2014 12:13 AM

Reading the OP again it seems his worry is lost power during start up.

Every Kramer drive I've worked on started normally using resistors of some form. Once the final rotor shorting contactor has closed the Kramer drive is brought on line, followed by the resistance dropping out of circuit.
Therefore there's no saving on start up.

I've got to admit I liked the Kramer system, I've only ever had one fail. That was easily sorted as the drive could revert to normal full speed running and the Kramer system could then be isolated.

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Associate

Join Date: Apr 2014
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#9

Re: Saving Energy on Big Slip-Ring Motors Using Recovery Systems

05/16/2014 11:55 AM

You may refer articles below:-

http://electrialstandards.blogspot.in/2014/05/variable-frequency-drive-working.html

http://electrialstandards.blogspot.in/2014/05/power-saving-by-using-variable.html

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