Electric Motors

[mbartlett]

Hi Guys,

We ended up having a discussion in our office about electric motors and where we can find some.

What are using them for are manipulating valves (4 Way Barksdale Style) for a hydraulic closing unit (oilfield).

We have a few requirments.

1. They must put out at least 750inlb of torque
2. Must be small enough to mount on the front on the valve and not stick out from it (think a 4"x4" square as the front of the valve)
3. Preferably it needs to be explosion proof (but not neccessary)

If you ned mroe information, I probally can dig it up.
Thanks

 

[zekeman]

Wow. Are you sure of the 750 lb in to move a valve in 4 inch envelope? By the way, what RPM are you talking?
I would say that if the torque were actually a lot less, you will need a DC gear motor to do the job, but get the torque down a bit.

 

[mbartlett]

The Torque is at the hub of the valve (Rotary Shear)

The other option we have is to run an Linear Actuator, similar to what we use now.

The time frame, fast...~0.5sec or less for 90Deg of motion.

 

[BrianPetersen]

Given the torque and the speed, it's possible to calculate that you need at least 0.36 horsepower to do that much torque in that timeframe, so you are probably talking a 0.5 horsepower motor. If done by the usual conventional means, that would require a 0.5 horse 1750 rpm motor connected to roughly a 60:1 gear reduction ... it's going to take more space than you have given.

Normal motors and gearboxes are designed for continuous duty, which this isn't. What about an automotive or motorcycle starter motor with a gear reduction on it?

 

[mbartlett]

Ill have to take a look into it, because this has an Oil Field application, we do need the option to go with explosion proof if possible.

Using a gearbox might be a problem, but Ill look into it.

If I have more questions, ill ask.

Thanks

 

[ScottyUK]

As you appear to have a hydraulic power unit available already, why not use a hydraulic actuator? Something like

http://www.icfluid.com/rotaryactuatorsproducts.html#IC 20 Series.

If you can't use a gearbox or a worm & wheel then an electrical solution isn't going to fit in that space. How fast do you need to operate the vales, i.e. you need 750inlb at what rotational speed?


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If we learn from our mistakes I'm getting a great education!

 

[mbartlett]

We are already using hydraulic/pneumatic power to run the valves.

Only thing is, to get everything hooked up (1/4" stainless lines) takes 40+hrs for the mid range units.

I was hoping for a easy answer to this, but running gear boxes and such might be more expensive than running line