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  1. #1
    Join Date
    Jan 2005
    Location
    Castle Hill, NSW
    Age
    75
    Posts
    0

    Default Electric Motor Query

    Not sure if this sort of question is permitted here, please let me know if it is not or if anyone knows of aform for electronics that is as good as this one is for WQoodwork - then please PM me

    I have salvaged an Electric Motor from an old dishwasher and I would like to use it for a workshop project.

    It's made by Betts (a division of James Kirby) - Model 50E008-01

    It has 4 connection wires
    Green/Yellow - Earth
    Brown - Active
    Blue - Neutral
    Black - ??

    When I start it - it runs slowly for about 30 secs and then goes to full speed (2800rpm)

    I have two questions
    1) what whould the black wire be for ?
    2) any idea how to make it go to full speed immediately

    Regards

    Bob S

  2. #2
    Join Date
    Sep 2003
    Location
    Mid North Coast
    Age
    71
    Posts
    100

    Default

    Slow speed start is a desirable facility on some woodworking tools like routers.
    I was speaking to a neigbour of my parents and he made one of his lathes out of a washing machine motor

  3. #3
    Join Date
    Jan 2004
    Location
    Over there a bit
    Age
    17
    Posts
    503

    Default

    My only experience with single phase 4 wire motors have a separate control box to the motor, e.g. submersible bore hole pumps. You need the four wires as you have an earth, neautral, run winding and a start winding. The latter has the capacitor mounted in the control box remotely from the motor. This may explain why it is slow to start, I can't see why a dishwasher would need a soft/slow start mechanism.

    Apart from this you will need someone who actually knows what he is talking about, cos I don't, never have, and never intend to do so.
    Boring signature time again!

  4. #4
    Join Date
    May 2005
    Location
    Newcastle
    Age
    73
    Posts
    1,064

    Default

    Bob the 4th wire could be to reverse the direstion , bring in interpols these allow faster speed as on a lot of washing m/c motors or for a capaciter start.Can't tell anymore than that without looking at the motor and windings

    The slow speed start is because at start up a motor drawes 6 times the amperage as it does when running thus capaciter start or stepped start as you would huge cables for direct on line start at full speed.






    I used to have a handle on life, but it broke.

  5. #5
    Join Date
    May 1999
    Location
    Grovedale, Victoria Australia
    Age
    66
    Posts
    2

    Default

    You will find the capacitor in the control panel of the dishwasher. Normal starting time for any single phase motor is seconds as they are not designed to run for long periods on the start windings. These are fine wire windings and overheat easily.The capacitor gives it a kick start to get up to speed the change over to the run windings at a lower current level.
    Jim Carroll
    One Good Turn Deserves Another. CWS, Vicmarc, Robert Sorby, Woodcut, Tormek, Woodfast
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  6. #6
    Join Date
    May 2009
    Location
    townsville
    Posts
    1

    Default Ancient query

    Bob, Don't know if you still have that Betts motor from dishwasher. If you still have it and have not used it could you contact me [email protected] as I am looking for one. Can anyone help?

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