choice motors gear

[claudio777]

hello to all and good morning, I wanted a hand to choose a gear motor that allows me to operate an electric actuator that has the following technical characteristics (from rk rose+krieger catalog): axial force max 15000n, (in my case I have 12500n), maximum torque 40nm, maximum speed (of the actuator I imagine both of the trapeze screw 28x5) 27mm/s.
I ask for a hand/help with calculations and with the choice of the driver. I also attach calculations.

 

[meccanicamg]

Let's start badly.
You haven't read the rules.
You didn't show up.
before engineering that school you did.
What's wrong with you? Did you do that? rational and applied mechanics?
Do we have to check the calculations all or just the choice of motor vehicles?

from the description you understand little.

do you have a more geared motor more joint than trapeze/kick screw?

Trapeze or ball screw?

actuator: object that generates motion. is certainly not the user. you are understanding that the linear module generates....xyz?

it is necessary to make clarity before leaving with numbers.

post a pattern.

I am sure that on the pdf manual of rk rose+krieger there are also formulas... .

performance?

 

[claudio777]

Before engineering I did the classic high school, I'm doing a master thesis job in mechanical engineering. At the moment I selected only an electric actuator and to drive it I would like to use a gear motor I should choose. I wanted some help to pick it up or at least a tip. the actuator has a trapeze screw 28x5 and in addition all those data I found on the catalog

 

[meccanicamg]

data is not consistent.
if you have 40nm to the engine, with reduction ratio 4.5 you get to the screw more than 5 tons.

Let's try to do this:

12.5kn lens to the screw.
motor 4 poles 1,5kw, monostage gear ratio i=4,6.
estimated output reducer 0,98 and trapeze screw 0.23.
This is what theoretically approaches more to your data.

Let's go see Who.Unfortunately the coupling 4 pole motor with reducer with so low ratio is not available. therefore it is necessary to mount a 2poli motor and then double the reduction ratio.

then you can mount the motors that I attach you and put the engine from 1.5kw 2poli.

 

[meccanicamg]

Before engineering I did the classic high school, I'm doing a master thesis job in mechanical engineering. At the moment I selected only an electric actuator and to drive it I would like to use a gear motor I should choose. I wanted help in choosing it or at least one straight

brave to go from classic to engineering.

the speech you made with the formulas of the vine yield is ok.

However, you must also consider the reducing performance.

if the goal is the push on the screw/chip you have to work with iterations to see engine and gearbox available.

 

[claudio777]

no, the max torque of 40nm is of the actuator, and in all this the gear motor should be in line, because both actuator and motor have to enter a diameter pipe dn 200, and therefore at most with a encumbrance of 100mm

 

[meccanicamg]

no, the max torque of 40nm is of the actuator, and in all this the gear motor should be in line, because both actuator and motor have to enter a diameter pipe dn 200, and therefore at most with a encumbrance of 100mm

you continue to appoint actuator....but your linear actuator can only have couple up to the snail/vite that is placed inside it.

then if you want to stay online you have to go on an epicloidal gearbox.

a pipe dn 200 will have an inside 200mm.... what does it do 100mm?

What's in the pipe? Do you need stagnated stuff?

 

[meccanicamg]

Red reducers do not have what we are looking for or better you need to switch from industrial to precision to content games...but they only have the Sr servo-riders that are not the ones we are looking for.

alternatively there specialized wizard or other builders. on these gearboxes you will have to decide whether to mount brushless, squirrel cage, high-performance asynchronous boards etc.

in the cp series you can find what you need.

cp 015 mf has out more than 40nm nominal so it is the size you should rate.

you can also use their selection software.

The scheme of your toy is this:

 

[claudio777]

Let us say that my only constraint is this of the encumbrance and however I imagine that there are compact motors

 

[meccanicamg]

Let us say that my only constraint is this of the encumbrance and however I imagine that there are compact motors

epicycloids for servo applications. see previous post.

 

[claudio777]

So could they come in?? those of the bonfiglioli I had seen

 

[meccanicamg]

So could they come in?? those of the bonfiglioli I had seen

also bonfiglioli makes the epicicloidali gearboxes for servo motors. in the end they copy each other .... depends only on configurability, documentation and cost as well as times of supply.

 

[claudio777]

at the moment the cost and all the rest is just contour

 

[meccanicamg]

at the moment the cost and all the rest is just contour

to optimize you can use bonfiglioli.
definitely doesn't cost like a wittenstein and does his job well.

So you need more or you have clear ideas to continue?

 

[claudio777]

I wanted a hand on the calculations because the maximum torque I have and is 40nm and I also calculated the maximum number of laps per minute of 324, and I wanted to calculate a couple "minimum" (or at least less than 40nm) through the formula I saw on the catalog of trapeze screws and then I wanted to calculate a minimum value of the number of turns so that it guaranteed me the axial thrust force of 12500nducer, for the choice of

 

[meccanicamg]

Your request is not clear to me.
the minimum torque is zero with engine off. depending on the engines you can also have maximum torque and do not rotate the rotor.
servo motors, but also classic squirrel cage motors (but servoventilated) can provide nominal torque from zero rpm to their synchronism speed (for a 4 pole will be 1500rpm minus the slide that will make about 1450giri/min.

this you see from the specific curves of the engines.

 

[meccanicamg]

If we said we will look for a 2 pole motor and a gearbox with 9...10 ratio we will have that the asynchronous motor will follow the curves below:In reality the limit of difficulty of regulation is the threshold of 5hz.
I recommend encoder in the engine and non-autoventilated electric assisted ventilation.

 

[claudio777]

my question maybe stupid is: if at a number of laps below 324 rpm the gear motor can guarantee the same strength of 12500n?

 

[meccanicamg]

my question maybe stupid is: if at a number of laps below 324 rpm the gear motor can guarantee the same strength of 12500n?

We make reasoning backwards.
324rpm output multiplied i=10 of the reducer makes the engine turn to 3240rpm.
it would be better i=9 but it doesn't change.

the 2poli servoventilati motor has constant torque from 190rpm up to 2820rpm.
if the engine turns to 190 rpm you have that screw turns to 19rpm.
therefore the torque of 40nm remains constant in the range 190-2820rpm of motor.

 

[claudio777]

here perfect was what I wanted to know, now you just have to find one that suits me for the trick I need, that is quite compact