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Author Topic: [REQ] Looking for opto-isolated motor speed controller  (Read 1619 times)
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leaveme
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« on: September 23, 2010, 06:50:01 06:50 »

Hello:

I'm in need of an opto-isolated motor speed controller. The PWM will be provided from PC through LPT port and will be driven an AC motor (220V). In this way I can control the speed of the AC motor (e.g. AC FAN) from PC. But it has to be opto-isolated so that the PC will be isolated from the AC mains.

I'm actually going to design my own but it will save my time (desing, debug & testing etc.) if somebody already has designed similar.

Thank you in advance.
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oldvan
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« Reply #1 on: September 23, 2010, 03:39:27 15:39 »

Is the fan motor 1 or 3 phase?
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solutions
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« Reply #2 on: September 23, 2010, 06:20:46 18:20 »

Also need to know the HP or peak current rating.
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leaveme
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« Reply #3 on: September 23, 2010, 09:58:53 21:58 »

It will be a single phase motor about 2 HP.
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TomJackson69
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« Reply #4 on: September 25, 2010, 09:13:23 09:13 »

How about use a TRIAC, a DIAC and an OPTO-ISOLATOR (few more components to complete). Or you can buy a SSR (Solid State Relay) and connects it to an Opto-isolator to control. You don't really need high speed opto to control.

I suggest get some informations (or data sheet) about Triac, Diac, opto-isolator and SSR before you build one.

Tom
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