What Spec of Motor do i Need
What Spec of Motor do i Need
(OP)
Good evening all,
i am involved in an organisation that build attractions for various events.
we are construction something bespoke that rotates around with a weight of around 3 tone. we are happy with the construction of the movement and everything to go with it. all i could do with advise on is the selection of a suitible motor and gear box.
we wish to stop the movement at various points around the 360 degrees and then reversing. if you imaging a swing going back and forth higher and higher aroungnthe circle of movement and then every so often completing a 360 dergree movement. any advise? if you need more info please ask. we are going to need to purchase something in the next few weeks so as to hit our deadline
i am involved in an organisation that build attractions for various events.
we are construction something bespoke that rotates around with a weight of around 3 tone. we are happy with the construction of the movement and everything to go with it. all i could do with advise on is the selection of a suitible motor and gear box.
we wish to stop the movement at various points around the 360 degrees and then reversing. if you imaging a swing going back and forth higher and higher aroungnthe circle of movement and then every so often completing a 360 dergree movement. any advise? if you need more info please ask. we are going to need to purchase something in the next few weeks so as to hit our deadline





RE: What Spec of Motor do i Need
Chuck
RE: What Spec of Motor do i Need
RE: What Spec of Motor do i Need
Glad to hear it. I'm not trying to be a stickler, but are you involved in engineering? That is the target membership for the forum.
Since you are a first time poster, I'll mention site policies:
FAQ731-376: Eng-Tips.com Forum Policies
In other words the site is more for engineers than do it yourselfers asking help from engineers. I'm not passing any judgements but I tend to agree with flexoprinting that your original post and initial response does nothing to create any impression other than DIYer looking for an engineer to spoonfeed him a solution.
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(2B)+(2B)' ?
RE: What Spec of Motor do i Need
So again if anyone is out there and wants to give this so called 'diy'er some much needed advise, i and the organisation I am involved would be very grateful
Good evening
RE: What Spec of Motor do i Need
That would probably fit most attractions except for the wildest ones. But will it be of any use for you? I really doubt it.
Tell us about the mechanics. What is the movement going to be? Masses involved? Speed and acceleration. Things like that.
It is nice that you are trying to be nice. But asking for help without revealing what the help is for is not nice.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: What Spec of Motor do i Need
If you where to imagine a 3 M disc spinning around its centre at around 10 to 15 RPM. with the disc weighing 3tone balanced around the disc. The disc is vertical mounted so the shaft running horizontally. As I said we will be programming this to go clock wise then anti clockwise end around twice a minute completing a 360 movement. So we want to make sure the gear box is man enough to stop the moment and reverse. We will slow it down to a stop and reverse with the use of VSD and some limit switches set around the outside of the moving circle to a fixed mounting. As I said I don't know how to work out the torque and inertia needed to start the movement and stop/ slow down
Regards matt
RE: What Spec of Motor do i Need
If the disk is balanced, you do not need much power to make it rotate. But you need torque to accelerate/decelarate it. Since a 100:1 gear reduces moment of inertia 100 times squared, or 10 000 times, I think that 10 HP will be ample. It depends on what acceleration you want. Not much, I suppose. And probably with an S-ramp. That is available in most standard VFD:s.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: What Spec of Motor do i Need
RE: What Spec of Motor do i Need
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(2B)+(2B)' ?
RE: What Spec of Motor do i Need
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(2B)+(2B)' ?
RE: What Spec of Motor do i Need
RE: What Spec of Motor do i Need
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: What Spec of Motor do i Need
If you go this way you would end up in producing an experimental or study type project. The one you must have done during your college days. From the description, it appears to be an expensive equipment consisting of electrical, mechanical and control equipments. You must understand that this is not only the issue of motor, but the complete equipment as a package. You will be answerable to the management and the people who have generously donated the fund.
I could imagine this something like a roller coaster or a moving disc which would carry people (specifically children). Thus safety should be an important aspect of your task.
If you search in the web for the vendors who are supplying the equipments for the entertainment industry you should be able to get few suppliers. You prepare a high level specification (which is also called as functional specification)and send them requesting the technical proposal. They would provide you some details, which you should use to further detail your specification and narrow down the requirements.
Your functional specification may include the details of power supply available at site, Variable Speed Drive motor requirement, other controls, capacity etc. Also give a good introduction/background of the requirement.
Hope this would help you.
RE: What Spec of Motor do i Need
Or maybe I was logically focusing on the area of the thread before people started guessing at horsepower [wink]
Or maybe it was the lack of pristine notation in using M vs m. [3eyes]
Or maybe just maybe I wasn’t paying close enough attention. Nah, that’d never happen[ponder]
No complaints on my part. I was just wanting to make sure we keep on guard against giving advice to someone who’s in over his head. krisys’ post is a good followup in that regard.
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(2B)+(2B)' ?
RE: What Spec of Motor do i Need
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(2B)+(2B)' ?
RE: What Spec of Motor do i Need
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(2B)+(2B)' ?
RE: What Spec of Motor do i Need
My thinking is that you can start people in a direction that isn't completely wrong. They will then find out a lot of things by themselves. And sometimes they will fail completely. They learn from that, too. One lesson that they learn is to get a professional involved next time.
The risk that someone gets hurt is always there. Byt you cannot build and start using any such contraption just like that. There's always a certain amount of inspection and paper-signing involved to protect the public.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: What Spec of Motor do i Need
RE: What Spec of Motor do i Need
With this you can control direction of rotation, speed of rotation and position.
You can program this according to your requirement.
Please go through Seimens Servo motor series.
Other companies such as ABB, Philips also has these. Used especially in Industrial size robots.
To reduce load on the motor you can make a stage that can revolve on its axis, with the help of a shaft and ball bearing , balance on the middle of the structure, geared as like a circle (Imagine concentric circles).
The motor can be connected by gear to this gear that lines the stage. Hence the motor doesn't need to carry the weight.