[TowerTalk] US Tower HDX572

[Jim Lux]

On 9/18/12 5:45 AM, Tom Crothers wrote:
> Hi Everyone,
>
> I've been busy for the last six weeks or so getting a used US Tower HDX-572
> ready to go up.  I tested the raising motor yesterday, and found that it is
> dead.  The motor itself is part of the US Tower MDPL-1000 lift apparatus
> that is attached to my tower.
>
> I cross referenced the Leeson Electric motor - part number 1100018.00 (this
> is the motor that has failed) on Google.  I found several vendors online
> that sell the same motor with seemingly identical specs.

They probably ARE identical..
That's the great thing about industrial components; they use standards.

What you want to check is that the shaft diameter/configuration (keyed 
or not) and motor mounting configuration are the same.  A given size 
motor (case size, not HP rating, necessarily) comes in several flavors 
of mounting and you need to make sure yours matches.

The Grainger and McMaster-Carr catalogs (both online) have good 
explanations of how to go about ordering a motor.

Is your motor open dripproof, TEFC (totally enclosed fan cooled) or 
something else? What frame size?  56 or 56H are the most common in the 
sub-2HP range.  You might have a C-face mount (the mounting holes are in 
the face of the motor, as opposed to on the side with saddle mounts).. C 
face is very common when driving a gear box, etc.

Once you've got the mechanical issues worked out, then it's a matter of 
matching electrical specs: speed (there's only going to be 2 or 3 
possible values: 1725 is by far the most common, you might find a 1140 
or 3450 RPM.

They probably use a standard duty motor, but you should check and make 
sure that for some reason, they've used something else.

If you give us the Leeson model number, we can look it up and give you 
the cross reference to almost anything else.


-> there's one big exception (and it's important).. if the mfr has used 
a "custom" motor, either because they got a good deal on the price to 
buy a pallet or truck load of them or because they had some weird 
configuration issue, and could commit to pallet load quantities, it 
might be non-standard.

I used to work for a place where we made LOTS of fans, and we had 
special ordered PSC motors that looked quite standard, but had a few 
changes in the windings to optimize it for our needs.

A similar situation arises where a mfr gets a really good deal on 
surplus motors for the first production run (and actually starts the 
business that way), and then has to order custom motors to match that 
first good deal.  If you're buying motors by the 50s and 100s, the cost 
differential is tiny from the standard product.

  I'm no electric
> motor guru, but I know there are various engineering considerations.  Does
> anyone have any words to the wise as far as ordering one of these available
> motors?  Does anyone recommend anything else, and/or have success stories
> from past experiences with failed tower motors?
>
> I'm very appreciative of any assistance that can be rendered.
>
> Thanks,
>
> Tom
>
> K8ANA
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