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Anonymous Poster

Looking how to electronically

03/29/2008 5:00 PM

HI!, I am working in a project that uses 24V. D.C., MY PROBLEM is

that i can not find how to change the polarity of the current in the electromagnets I am using... it has to be with a range of around 500 times per second. Could somebody give me some guide to who contact..?

My EMAIL IS:

talovida@gmail.com
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Skelley
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#1

Re: Looking how to electronically

03/29/2008 5:22 PM

Try these folks. http://www.standardtechnologyinc.com/Default.aspx?tabid=744526

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TVP45
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#2

Re: Looking how to electronically

03/29/2008 7:41 PM

Hello,

Given the inevitable waveform distortion, could you just use ac for this?

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bwire
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#3

Re: Looking how to electronically

03/29/2008 8:26 PM

If reverse leads and flash them it does not change?

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Bill
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#4

Re: Looking how to electronically

03/30/2008 6:14 PM

Look up full-bridge motor driver or pulse width modulated circuits, such as LM18245 and associated control circuits.

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lordravindran
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Join Date: Oct 2007
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#5

Re: Looking how to electronically

03/31/2008 9:53 AM

Connect the coil of the electromagnet in an H-Bridge of 4 transistors. Drive the base of alternate pairs of the transistors with astable oscillator of 500 Hz.
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gigaconcept.com
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#6
In reply to #5

Re: Looking how to electronically

03/31/2008 10:02 AM

There is care to be taken as to Ton and Toff timing of the transistor pairs, not to end up shorting out the supply.

A small deadband is necessary.

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