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Does any alternator* fitted in cars have an impeller ?

Discussion in 'Electrical Engineering' started by TE Chea, Jun 20, 2007.

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  1. TE Chea

    TE Chea Guest

    My NipponDenso * has no fan / impeller to pull air into * to cool
    *, so this * ( esp when heated by engine block ) gets too hot ( can
    boil an egg ) in 33ºC air, output ( ampere & voltage ) drops too
    low just as described in
    www.aa1car.com/library/charging_checks.htm last paragraph.
    Users cannot fit an impeller because no space exists between (
    drive belt's ) pulley & * ( like in this web page's photo ).
    I presume such *'s designers want to keep * small, to fit * into
    engine compartment, but leaving out an impeller ( & let * overheat
    , as per this web page ) looks ridiculous.
    My Hitachi lawn mower's motor has an impeller : motor never gets
    hot if impeller is fitted. Our 3 Black & Decker trimmers' motors
    have no impeller, all 3 motors' coils melted in 33ºC air & had to be
    recoiled.
     
  2. Tegger

    Tegger Guest



    I just happen to still have my old ND alternator from my '91 Integra.

    I study this unit, and lo and behold there is an impeller at BOTH ENDS:
    both the diode end and the pulley end. One is evidently a "pusher" and one
    a "puller".

    Both impellers are within the casing and are not readily visible without
    close observation, but are unmistakeably present.
     
  3. Nate Nagel

    Nate Nagel Guest

    ALL of the alternators I have ever worked on have had some sort of fan
    (various Delcos, Prestolites, Bosches and Motorolas)

    nate
     
  4. Steve

    Steve Guest

    Correct- every ND alternator I've ever seen looks like a small clone of
    the original Chrysler alternator- finned case with a fan on each end of
    the shaft (two fans) on the INSIDE of the finned case. No big external
    fan required.
     
  5. TE Chea

    TE Chea Guest

    | Have you looked inside the unit yet?
    No, I could not pull its rear cover ( part #15 in w-page of url
    attached, has ND embossed on it ) off, after removing 3 nuts.

    | There should be a steel fan attached to the rear end of the rotor.
    No fan visible in diagram of this w-page, url attached :
    www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=Accord&catcgry2=1990&catcgry3=4DR+DX&catcgry4=KA4AT&c
    atcgry5=ALTERNATOR+%28DENSO%29


    | ND makes probably the most reliable alternators I have ever seen in
    | production.
    Possible ; how this * can survive such heat amazes me.
     
  6. I had to look twice, with a high power flashlight, inside the back of
    my alternator to find the cooling fins, but they are present in my
    Vulcan V6 Ford engine alternator. At first it didn't look like there
    were any, so you have to look closely. Maybe reading glasses will
    help. Mine are right at the coil windings.

    Lg
     
  7. Tegger

    Tegger Guest


    Wiggle it some more. 3 nuts is all that holds it on.


    <snip>


    Go look at your own alternator. Pictures are not always worth a thousand
    words. Sometimes they're worth less than zero words.

    ND alternators have, not one, but TWO fans.

    And on further investigation, it is clear I was wrong in my original guess
    that one fan was a puller and one a pusher. BOTH fans are pullers. Both
    fans pull air in from their respective ends, then exhaust it radially
    through the slots in the perimeter of the alternator casing. It appears
    that this is the sole purpose of those slots: Air exhaustion and alternator
    cooling.
     
  8. Tegger

    Tegger Guest


    You are utterly, tragically alone.

    Stroboscopic lighting in an alternator indeed. <snorts in disgust>

    Why can't you be like decent, tasteful people and stick to stroboscopic
    under-car neon lighting?
     
  9. TE Chea

    TE Chea Guest

    | ALL of the alternators I have ever worked on have had some sort of fan
    | (various Delcos, Prestolites, Bosches and Motorolas)

    You are credible. Mysterios are not, those few in this thread
    are salesmen of japan cars with this *, want to bluff & hide
    this *'s inadequacy. Such a hot * suits only cold climate <10
    ºC ; *'s heat will flow into engine to help heat up engine &
    indirectly car's interior. In warmer climate >25ºC, this * is
    bad, in >33ºC - disastrous.
    I'll ignore mysterios, they can bluff all they want.
     
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