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Sonsivri > Electronics > Projects (Moderators: bbarney, pickit2) > [REQ] Looking for opto-isolated motor speed controller
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leaveme
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« on: September 23, 2010, 05:50:01 05:50 »
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, 02:39:27 14:39 »
Is the fan motor 1 or 3 phase?
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solutions
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« Reply #2 on: September 23, 2010, 05:20:46 17:20 »
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, 08:58:53 20:58 »
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, 08:13:23 08:13 »
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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Con Rong Chau Tien
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