can anyone please suggest me a servo motor which can be used to achieve humans walking speed and speed can be controlled dynamically using arduino.
Thanks
Need more details
A lot more.
...R
Any servo, if used appropriately, will do.
You should look at the various walking bot kits available and chose the servos that work in designs similar to your design.
Last time I checked walking speed was not measured in RPM.
Can you explain better what you are trying to achieve? Actual numbers (mass, speed, rpm etc)
are useful, vague descriptions are not normally helpful (what you call small and what I call small
can be very different!)
MarkT:
Last time I checked walking speed was not measured in RPM.
Jeez - have you still got feet ?
...R
There's a difference between a servo actuator (such as most hobby servos) and a servomotor
(which can rotate freely and be position or velocity or torque controlled, a standard industrial part)
Mostly people just say servo and mean a hobby servo actuator / servomechanism, sometimes a hobby
"continuous rotation servo" (which isn't a servo at all), or a sail winch servo (more like a true servomotor
but with limited rotations).
Actuators typically move something back and forth, usually linear or arc, and are limited in range,
motors can go round and round for ever. Most actuators have motors within them.
"Servo" means a device can be positioned repeatably according to a command signal, so a servo
actuator can be set to a given position and it will attempt to hold position if its back-drivable,
using position feedback.
Servomechanism is the generic term, covering all types of actuator and motor with such closed loop
control.
So does the OP want a servomotor or just a hobby servo? Its hard to know from the information so far,
we need some clarification 
i am designing a mobile robot (with 3 wheels) which is supposed to follow person. in back and forth motion. if persons walking speed increases or decreases mobile robot should also follow the change in speed. I have gone through some articles and i think DC motors will be good choice. torque is not at all a issue. it just have to carry a weight of at max 2 kg..
Will DC motor work well..?? Please Suggest your views..
articles and i think DC motors will be good choice.
I kind of agree, gasoline engines might be a little over kill and harder to maintain and control.
2kg is small, this is doable. Figure out the wheels and decide on a max incline to climb and you
are well on the way to a good estimate of torque at the wheels. Budget 1.5 to 2m/s(*) for top speed
and that'll give you power (power = angular velocity x torque). Add in a x2 safety factor for losses
in gearing and tyres, you'll be there.
Alternatively there are many robot platform kits out there already of varying specification that
might be suitable.
(*) reasonable walking pace.
i have chosen a 12 V Dc jonson motor with 200rpm torque 5kgcm and current= 800mA to 9.5 A(load)..
WILL it work??
amolamol:
WILL it work??
Try it and see what happens.
Choosing motors is an area where experience counts for a lot.
If you can't afford to learn by your own mistakes just copy what someone else has done.
...R
sry but..
its my major project work so cannot afford trial n error approach
amolamol:
its my major project work so cannot afford trial n error approach
If you can manage without trial and error you will be better than every other inventor that ever lived.
The alternative to trial and error is to pay a professional and take advantage of his trial and error.
...R
amolamol:
i have chosen a 12 V Dc jonson motor with 200rpm torque 5kgcm and current= 800mA to 9.5 A(load)..WILL it work??
No, wrong approach, first measure/calculate/dertermine the power and torque you need, then
choose a motor/gearmotor that is able to provide this, then choose appropriate driver electronics
and power supplies.
If you need a maximum torque of T and power of P, choose a component that has torque >= T
and power >= P - no trial and error there.
If you need to compromise on cost or motor or battery size, go round this design loop again with
modified requirements for top speed and power... But this is all on paper, so not the same as
trial and error.
To have a good estimate of force/torque/speed/power it may mean building the platform first and
measuring (because friction and rolling resistance is hard to calculate), or calculation (with a
margin of safety to allow for friction and losses.
Newton showed us its a clockwork universe centuries ago, mechanics is a science not
guesswork these days.
i appreciate your sense of humor.. and thanx for ur response