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Old September 4th, 2020, 07:43 AM   #1
jimcav
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large dc motors

I need to get pricing on a 1500hp 300 rpm DC motor. Any thoughts on who to call?


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Old September 4th, 2020, 08:22 AM   #2
Steve Bailey
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Where in New Jersey are you? K & J electric serve upstate New York. They have an office in Binghamton. They have furnished AC motors up to 200 HP for a former client of mine. I know they handle DC motors as well, but I don't know how large they go or how much they get into less standard items.
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Old September 4th, 2020, 09:09 AM   #3
cidchase
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One possible source:

https://www.tecowestinghouse.com/PDF/DC_Motor_12_04.pdf

Everything is bigger in Texas...
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Old September 4th, 2020, 10:00 AM   #4
GaryS
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Why ?
Is this for a replacement or a new application ?
if this is for a replacement then it would be more cost effective to have it rebuilt
If this is a new system it will more cost effective to go with an AC system
a good vfd will give you much better performance then any DC system. Wider seed range
lower cost, and no brushes to service.
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Old September 7th, 2020, 08:08 PM   #5
Gene Bond
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You might check with these guys: https://www.jolietelectricmotors.com...on-motors.html

I've run into a few of them.
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Old September 7th, 2020, 10:16 PM   #6
GaryS
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1,500 HP, that would be a 4,160 Volt line voltage motor
Long lead time with either DC or AC Good luck
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Old September 8th, 2020, 03:21 AM   #7
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I instinctly think that copper is more expensive than steel nowadays. So maybe use a 6 to 1 gearbox to convert the 1500 hp @300 rpm into 250 hp @1800 rpm.
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Old September 8th, 2020, 07:20 AM   #8
Gene Bond
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Torque (FtLb) = (HP x 5250) / RPM

It would take 6 250HP motors to make the torque of a 1500HP motor, regardless of the gear reduction.

Unless, however, the 1500HP motor was a base speed of 1800, but running at 300RPM, then it's only putting 250HP out...

But I read the OP's spec as a 300RPM base speed.
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Old September 8th, 2020, 07:29 AM   #9
I_Automation
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Elevators use large DC motors.

Call your local Westinghouse or Otis service provider and see if they can help with sourcing a motor.
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Old September 8th, 2020, 10:08 AM   #10
Tom Jenkins
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Quote:
Originally Posted by JesperMP View Post
I instinctly think that copper is more expensive than steel nowadays. So maybe use a 6 to 1 gearbox to convert the 1500 hp @300 rpm into 250 hp @1800 rpm.
Sorry - you can't do that. Gearing will change speed and torque, but hp, like energy, cannot be created or destroyed. The hp at any point in the system will be constant, minus friction losses of course.
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Old September 8th, 2020, 12:06 PM   #11
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Sorry - you can't do that. Gearing will change speed and torque, but hp, like energy, cannot be created or destroyed. The hp at any point in the system will be constant, minus friction losses of course.
Ah, yes you are right.
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Old September 8th, 2020, 03:36 PM   #12
cidchase
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Sounds like a drilling motor. However, if Jim is in the industry, seems like this wouldn't be his most convenient source for a supplier... I'm just interested to see what's the application, if it's not a state secret... And what kind of motor controller is involved.
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Old September 8th, 2020, 03:47 PM   #13
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Quote:
Originally Posted by cidchase View Post
One possible source:

https://www.tecowestinghouse.com/PDF/DC_Motor_12_04.pdf

Everything is bigger in Texas...
When I first read this thread I thought wow 1500hp is a big motor, then I read the Westinghouse pdf

Quote:
To meet the needs of a broad range of applications,
our rugged DC motors are available in sizes ranging
from 12-inch to 12-foot armature diameters, with
available power ratings up to approximately 35,000
horsepower
.
Now thats big... even for Texas, thats big

I had one that we had to take apart to get it downstairs because it was too heavy to carry but it was only a couple hundred at best.
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Old September 8th, 2020, 04:02 PM   #14
I_Automation
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Quote:
Originally Posted by geniusintraining View Post
12-foot armature diameters, with
available power ratings up to approximately 35,000
horsepower.
Note to self: New bathroom vent fan motor if you ever let the ex move back in.
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Old September 10th, 2020, 09:40 PM   #15
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Quote:
Originally Posted by geniusintraining View Post
When I first read this thread I thought wow 1500hp is a big motor, then I read the Westinghouse pdf



Now thats big... even for Texas, thats big

I had one that we had to take apart to get it downstairs because it was too heavy to carry but it was only a couple hundred at best.
The biggest DC motor I ever saw in person was a Reversing Mill motor on an aluminum sheet line. The client bought four of these motors..Installed three in real buildings, and left a spare armature strapped down to a rail car, so it could be moved where the problem was, if needed.

Yeah, pretty cool to watch the whole building's lights dim when an ingot hit the main roll stand.
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