View Full Version : What kind of motor do you think i need?

01-23-2009, 04:05 PM
I'm doing an experiment, in realisation of which i need to move a steel plate up and down. Please consider the following constraints faced by me:

-The plate would rise to 12mm at most.

-The speed should be such that it rises 12mm in around half a second.

-I want to be able to stop the plate anywhere between 0-12mm.

-Variation of the speed may also be needed.

-The plate will be exposed to high pressurefield above, so will tend to come down.

-I have only 75mm(L)*175mm(W)*25mm(H) space to accommodate the lifting mechanism.

-I can also mount the motor outside the above mentioned cavity, but the motor diameter less than 30mm is preferred.

After considering all the above mentioned constraints, i've thought of getting a miniature rack and pinion system manufactured. But the driving motor is still not finalized and i'm facing a problem in it. Initially i thought of using a geared dc motor but then i won't be able to stop it at the precise positions (4mm say). Servos can definitely be used but the speed control is a problem.
Stepper motor seems a good choice but i haven't got much experience working with them.

So, please help me choose a good motor or a new mechanism.

Thank you in anticipation.


01-23-2009, 10:13 PM
you missed out the most important parameter - weight.

01-24-2009, 08:30 AM
Weight is not much of a problem.
But given the small dimensions of the region i plan to fit the motor in, i think the motor won't weigh much.

01-24-2009, 08:37 AM
:evil: :evil:

weight of the steel plate.

01-24-2009, 01:23 PM
well, my computer modelling tells me it would be around 220gm.

01-24-2009, 02:05 PM

this is a possible solution. I dont find a suitable motor.
i think steppers might work, but circuit is the problem.
I dont have any exposure of microcontroller programming.