[TowerTalk] Ramp up

[K7LXC@aol.com]

> I am on my second 24 volt motor.  I have no binding in the mechanism and 
yet 
> the draw on the motor is 10 amps  at 22 volts.
>  The motors I am using are 24 volts General Electric RIC and have a rating 
of 
> 7.9
>  amps and have a time rating of 1 minute.   The motor is spec to turn at 
8500
>  rpm. I have two of these motors on two prop pitch assemblies The size of 
the
>  motor is 2 1/4 X 4 3/4 in.
>  The rotator assembly is turning a 5 element 20 meter beam on 46 ft. of 
boom. 
>  It is balanced as far as weight is concerned.

Hi, Denis --

    I'm not sure what the average current draw should be. Maybe someone on 
TowerTalk would know. 

    The prop pitches I've used don't really care what the antenna is or what 
the weight distribution is.
>  
>  I have been up there when it is rotating and note that it does not seem to 
> get  up to speed.
>  
    That's something I've never run into. The ones I use and the ones I've 
installed get up to speed right away. I don't know what the problem with 
yours might be. Have you have the motor turned? Have you installed new 
brushes? I'm not a motor guy but it would be worth doing IMO before you 
embark on your fix with the new motor. 

>  Maybe I am not using the correct motor for the prop pitch but they are the
>  motors  that came with the two prop pitches that I have.
>  
>  I would not want to pay $400 US each for two motors that I need.

    Someone on TowerTalk will have them for less - that seems excessive to 
me. 
>  
>   I have a source of 90 volt DC motors which are specified as 6000 rpm and 
> have a
>  rating of 1000 watts. I was planning on using this motor
> 
    How do you couple the new motor to the prop-pitch transmission? How about 
running your existing motors on a higher voltage?
 
>  I am tired of climbing!

    QSL. My antenna system needs a bunch of work and I haven't gotten around 
to it - hi.

Cheers,   Steve   K7LXC
Tower Tech

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