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Message from discussion AC fans in series - problem?
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Spoz  
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 More options Oct 18 2012, 1:29 am
From: Spoz <mr.s...@gmail.com>
Date: Wed, 17 Oct 2012 22:29:07 -0700 (PDT)
Local: Thurs, Oct 18 2012 1:29 am
Subject: Re: AC fans in series - problem?
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Yeah, they spin up fine at low voltage (it takes about 15 seconds to reach
maximum speed) but they do spin slower, and they have almost no torque at
all. They move enough air through the case, but blocking the intake almost
stops them completely.

Like I said we've already ordered the DC fans for reliability but I'd like
to know the theory behind it. Are they slipping because they don't have
enough torque to "keep up" with the mains frequency? Does that result in
greater current draw? Unfortunately I don't have any test gear with me at
the office to confirm.

On Thursday, October 18, 2012 3:06:47 PM UTC+10, Triffid Hunter wrote:
> On Thu, Oct 18, 2012 at 3:45 PM, Spoz <mr....@gmail.com <javascript:>>
> wrote:
> > Here is the datasheet:

> http://datasheet.octopart.com/DP201A-2123HBT.GN-Sunon-Fans-datasheet-...
> > (We have DP201A - 2123-HBT-GN)

> > They don't look like universal motors...

> you're right, datasheet suggests that they're AC synchronous, in which
> case reducing the voltage shouldn't change the speed at all...

> afaik AC synchronous are fine in series too, as long as they get
> enough volts to start properly.

> One of the titles suggests dual spinning rate, but doesn't seem to be
> any other details in the datasheet


 
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