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Author Topic: Soft start for three phase motor  (Read 1313 times)
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tienngoc
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« on: August 08, 2008, 02:39:06 14:39 »

Dear friends.

I have a problem: I want to build a soft start circuit for three phase motor  < 5KW.
Does anyone  help me? Show me books or soft about "Soft start for three phase motor".

Thanks alot.
« Last Edit: August 08, 2008, 02:42:05 14:42 by tienngoc » Logged
Walkura
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« Reply #1 on: August 08, 2008, 08:24:41 20:24 »

Maybe its a crazy idea (the simple option)
The simple option is ,can't you do it like with big transformers .
Small (high powered) resistor in serie that you will bridge after the initial inrush .
Second option a bit less simple but a lot more sophisticated .
That option is called a ac-ac chopper .
www.stmicroelectronics.com/stonline/books/pdf/docs/12105.pdf
You can simplify this schema quite a bit
(dispose of the switcher) use conventional powersupply .
Use a opto-gatedriver for the highside .
Leaves a bunch of fast diodes ,igbt's .
Ofcourse you will have to make something up with zerocrosssing detection to make it run nice in 3 phase .
Those mcu's aint that expensive just use 1 for every faseand have it triggered by zerocrossing Smiley

Goodluck and be carefull
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