Freight Elevator AC Motor

[Barbo88]

Hi all,

Can someone tell me which are the ideal AC Motors for freight elevators please ?

Best Regards
Barbo

 

[itsmoked]

Three phase induction motors.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Barbo88]

Even for high loads Elevators ? I mean my required load to my elevator is excpected to be around 2000 Kg and the required speed is calculated to be 0.8 m/s.

Regards
Barbo

 

[DRWeig]

Hi Barbo88,

Keith is right. Your load is big, but I have been in stronger elevators. Last on whose machine room I was in was rated 5000 lb at 4 ft/sec. The weight is about the same as yours, but it's a bit faster.

It had a large (didn't read the nameplate) induction motor and a variable speed drive.

Best to you,

Goober Dave

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[Barbo88]

Does anyone here has such experience in designing of elevators ?

It's my first project in designing an elevator so i dont have such experience ..

What things should i consider when designing a freight elevator. I was thinking that the motor that i have to choose needs to be able to cope for stoppages as its duty is going to be irregular, and also for braking.

do you know any sites which can guide me to choose an ac motor for such elevator designs ?

Best Regards
Barbo

 

[davidbeach]

Generally you just buy an elevator and the elevator company builds it. Trying to do one on your own and meeting all the codes and requirements will make your elevator cost far more than what it would cost to purchase one.

 

[itsmoked]

Absolutely! Designing your own would be a nightmare. There are so many tricks and methods culled from a century of elevator evolution that you cannot possibly do it justice. There are specialty components, techniques, and many many laws about how they work, built-in testing, and safety mechanisms.

Building your own will be like deciding to build your own refrigerator from a big pile of raw materials - starting with only the mining rites..

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Barbo88]

sorry, maybe i wasnt clear enough .. i'm not going to built the elevator i have to choose an appropriate ac motor for the parameters that i have .. which include, maximum load 2000 kg and speed of elevator should be around 0.8 m/s

Regards
Barbo

 

[davidbeach]

The elevator will come complete with the motor. Ask the vendor what size service they need.

 

[jraef]

Elevators in North America require very specific safety certifications, regardless of whether they are for freight or passengers. You would not be able to do what you are being asked to do here by anyone who understood that.

I once had to be involved in the process of getting soft starters certified by UL and CSA for use in elevator applications. The requirements were night and day different, UL was tougher than regular soft starter listings, but CSA was incredibly more difficult to pass, it involved what I would think to be impossible duty cycle testing. Every time I get asked to get involved in something like that again, I politely decline. My blood pressure is already too high...

"Will work for (the memory of) salami"

 

[Barbo88]

guys i'm not trying to build it by myself .. i know that elevator is something which requires lots of safety especially where it involves people. This is a project that i have and since i dont have any practical experience i'm asking here so maybe some of you who have worked in this field can tell me better what to consider when coming to choose an ac Motor for a heavy load elevator. Appreciate if you can guide me and give me your opinions.

Best Regards
Barbo

 

[davidbeach]

The elevator vendor will choose a 3-phase induction motor.

I'm not sure why you're worried about the motor selection, but it will be what it will be, the only influence you have is in the specification of the capacity and speed. The elevator vendors have design consultants that will work with you to select an elevator and they will then provide a package that specifies what the building needs to provide in terms of space, structure, power, and HVAC. If it is a hydraulic elevator the motor will near the base of the elevator. If it is a traction elevator the motor can be at either the top or bottom of the shaft, but motor at the top is far less expensive than motor at the bottom; that is also something that you can specify, but probably doesn't change the motor that the elevator vendor will select and supply.

 

[Barbo88]

Thanks guy. Do you know any good brands who specialize in these kinds of AC Motors for elevators ?

Best Regards
Barbo

 

[davidbeach]

I think you're not getting it; you won't be specifying or buying the motor, it will be part of the package. Your project won't even be supplying power to the motor, rather your project will supply power to the elevator system and they will distribute it to the various components.

 

[electricpete]

Maybe the explanation for oddball requests in the last two threads is a "design" assignment for a college course ?

In that case, you may or may not get help here depending on how the responders feel about it, but it would be better to be up front about the context for your question.




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(2B)+(2B)' ?

 

[DRWeig]

Get a guide specification from a couple of elevator manufacturers. There's nothing special about the motor, though. Braking will be electronic (VFD) or mechanical located on the motor shaft. The motor itself is literally an off-the-shelf component.

But don't bother specifying it or choosing it, see what the manufacturer chooses.

Best to you,

Goober Dave

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[chicopee]

Westinghouse makes elevator motors (at least Westinghouse use too), however follow the advices from the above responders about freight elevator installations.