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[APD] Re: pump motor gets hot and ....

Well, it has been my experience with numerous submerged pumps and directly
coupled pumps in the sump system I use for my tank, that they all generate
heat to some degree. Unfortunately, I have had some that do so to the
extreme. My tank heater rarely comes into use as the pump itself heats the
water. And no, there is no blockage, restriction, or extreme of any sort. I
am using a RIO brand at present, I have used Quiet One, and once even a
Little Giant (which was far too noisy). The action of the pump does indeed
generate heat which of course is readily transferred to the water flowing
out of it. The directly coupled pumps do seem to dissipate the heat into the
surrounding air and less into the water itself, at least in my experience.
But mind you I have only been in the aquarium hobby for 40 years.

Walt Wilson
> Date: Tue, 23 Dec 2003 04:44:42 -0800 (PST)
> From: "S. Hieber" <shieber at yahoo_com>
> Subject: Re: [APD] pump motor gets hot and why not
> To: aquatic plants digest <aquatic-plants at actwin_com>
> --- Steve Pushak <teban at powersonic_bc.ca> wrote:
> > If the pump is not blocked & is generating a good flow of
> > water, there
> > should be enough torque on the electric motor to generate
> > the back EMF
> > necessary to prevent excessive current flow, which is the
> > root cause of
> > heating.
> No, this is a centrifugal pump and blocking waterflow won't
> cause it to overheat.  Jamming the motor would but blocking
> the flow on a centrifugal doesn't jam the motor.
> Anyways, Vortexes run a bypass circuit, that's why you can
> get it to charge with diatoms by clamping the output hose
> closed.
> > Make sure the water flow through the pump is
> > occurring. Do not
> > operate a blocked pump; it will overheat irrespective of
> > whether its a
> > centrifugal pump or not.
> >
> > Perhaps the pump coupling is loose?
> No, it's direct coupled.
> >
> > If the motor heats even with a decent load, then it may
> > have an internal
> > short or was wired incorrectly or missing a fan in this
> > configuration.
> All electric motors heat -- the energy efficiency ios no
> where near 100%.  The Vortex kgets warm but not too warm to
> touch under normal operation.
> Scott H.
> =====
> S. Hieber

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