Hi everyone,
I'm planning to make a lift for two persons (+/- 150Kg -- 330lbs)
It will be a very basic lift withou doors, safety switches, etc... just to go up and down 
Can you please advise me what kind of motor is better for this purpose?
Stepper, DC, power, amps, relays...
Is it possible to use PWM?
Is this shield suitable?
Thank you very much for any help,
JA
Be aware that there are all sorts of regulations about passenger lifts, and that includes lifts that are not passenger lifts but may be used by passengers.
For a lift like that, you will need a mains-powered motor and most likely, solid state relays to control it.
The power required to lift an object of mass m is P = mgv where
P = power in watts
m = total mass lifted in kg
g = 9.8 m/s^2
v = upward velocity in m/s
If you lift 200 kg at 0.5 m/s you need 980 watts, absolute minimum. The motor must supply more than that to overcome friction and gearing inefficiencies.
Normally a lift is counter-balanced, for a two-person lift the counterweight would be
one-person equivalent, then the max lifting force needed is halved.
Having said this the safety and legal implications of this worry me - I hope this
is only a few feet of ascent like a truck tailgate lift? Otherwise there is danger of
injury and death to consider.
Thank you for your replies.
This is a project I'm planning to make in the future... for now I'm trying to collect some information.
I'm focused just in the motors/schematics/power, not in the safety... that's another problem to solve after this one.
For now I appreciate suggestions for motors, motor shields, schematics.
Thanks
A basic AC hoist.
Zoomkat,
Thats the kind of answers I like!
Simple and funcional!!! You just answered to my questions.
Now I can start to think about the safety rules, emergency brakes, bulletproof glass, and other problems. XD
Thanks again.