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Re: [PSUBS-MAILIST] motor thought

Jon Wallace wrote:

Hi Bill,
Only the electrical motor of the pump would have to be pressure compensated. Like you, I don't see a need to compensate the impeller component of the pump since it would always be at ambient pressure. Regarding the affect on the electrical motor, good question. Hopefully someone else on the list could answer it for us. Jon 
    -----Original Message-----
    *From:* owner-personal_submersibles@psubs.org
    [mailto:owner-personal_submersibles@psubs.org]*On Behalf Of *Akins
    *Sent:* Saturday, April 08, 2006 5:50 AM
    *To:* personal_submersibles@psubs.org
    *Subject:* Re: [PSUBS-MAILIST] motor thought

    Hi Jon.
I have a couple of thoughts/questions on the pressure compensation 
    of the pump. Would the pump even need pressure
    compensation? If the pump is fully flooded at ambient water
    pressure why would there be a need to compensate it?
    The other thought/question I have is this...in theory, a pump as
    you envision would act to compress the water and
    exert it outward in a jet resulting in forward motion utilizing
    the principle of for every action there is an equal and opposite
    reaction, correct? However, the pump has a limit to the force it
    can exert upon the water in creating this water jet correct?
    So if you were deep enough for the outside ambient water pressure
    to equal or exceed the same pressure the pump exerts
    on the water it pushes thru the jet, wouldn't this actually
    equalize and stop the pump from working? Just a thought, I haven't
    really thought this totally thru. What do you think?
    Bill Akins.
If the motors were running flooded in light oil or some insulating fluid, ac motors with variable frequency controllers might be better. The armatures could be potted to reduce turbulence and drag. 
Jim Rudholm




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