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'[EE] : Design of single phase variable frequency d'
2002\12\06@141853 by Jim Ruxton

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Does anyone know where I can find information on designing a single
phase variable frequency drive? I will be using a PIC so this isn't
entirely off topic. I would be driving a 1/3 hp permanent split
capacitor motor. Thanks!
Jim

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2002\12\06@151638 by Spehro Pefhany

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At 02:18 PM 12/6/02 -0500, you wrote:
>Does anyone know where I can find information on designing a single
>phase variable frequency drive? I will be using a PIC so this isn't
>entirely off topic. I would be driving a 1/3 hp permanent split
>capacitor motor. Thanks!

Unless your speed range is very limited, you'll actually be
designing a single-phase-input, two phase output drive and dumping the
capacitor. The passive network only has the appropriate phase
shift at a single frequency.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam@spam@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2002\12\07@162059 by Jim Ruxton

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>>Does anyone know where I can find information on designing a single
>>phase variable frequency drive? I will be using a PIC so this isn't
>>entirely off topic. I would be driving a 1/3 hp permanent split
>>capacitor motor. Thanks!


>Unless your speed range is very limited, you'll actually be
>designing a single-phase-input, two phase output drive and dumping the
>capacitor. The passive network only has the appropriate phase
>shift at a single frequency.

I know companies make these controllers and they don't say anything about having to dump the
capacitor to use them. See for example: http://www.anaconsystems.com/text/singleov.html .

Jim

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2002\12\07@163308 by Spehro Pefhany

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At 04:20 PM 12/7/02 -0500, you wrote:
>>>Does anyone know where I can find information on designing a single
>>>phase variable frequency drive? I will be using a PIC so this isn't
>>>entirely off topic. I would be driving a 1/3 hp permanent split
>>>capacitor motor. Thanks!
>
>
>>Unless your speed range is very limited, you'll actually be
>>designing a single-phase-input, two phase output drive and dumping the
>>capacitor. The passive network only has the appropriate phase
>>shift at a single frequency.
>
>I know companies make these controllers and they don't say anything about
>having to dump the
>capacitor to use them. See for example:
>http://www.anaconsystems.com/text/singleov.html .

If your application is *limited* to fans, rather than a general-purpose
drive as your initial inquire implied, the situation is rather different.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
EraseMEspeffspam_OUTspamTakeThisOuTinterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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