ice111
ice111
Branch Unspecified
26 Dec 2008

What is better Stepper or Servo?

Hi,

I’m planning to make a robotic Arm, so would like CE's input.

What is better to use to control joints of the robotic arm, Stepper or Servo?

I’m looking for good and sturdy movements as well as good capacity for lifting, let’s say 20kg.

Thanking you in advance.

~ Ice
silverscorpion

silverscorpion

Branch Unspecified
26 Dec 2008
Servo is obviously better to use in robotic arms because servos have internal control mechanism. So servos can give better control and precision than steppers.
icehari

icehari

Branch Unspecified
06 Jan 2009
silverscorpion
Servo is obviously better to use in robotic arms because servos have internal control mechanism. So servos can give better control and precision than steppers.
but i learnt stepper motors are very useful to make movements in steps and angular mavements..... what about that...

reply me lets make that clear...
sauravgoswami

sauravgoswami

Electronic
06 Jan 2009
Stepper motors are always better they are easier control and manipulate compare to servo motors
Ashraf HZ

Ashraf HZ

Communications
06 Jan 2009
20kg? Servos would work better with those types of loads. But, they are more expensive.

If I were you I'd get one a piece and do some testing 😀
icehari

icehari

Branch Unspecified
06 Jan 2009
ash
20kg? Servos would work better with those types of loads. But, they are more expensive.

If I were you I'd get one a piece and do some testing 😀
yes i agree, servo's can pull heavy loads better than stepper..
ice111

ice111

Branch Unspecified
06 Jan 2009
Hi,

In robotic arm, pulling heavy load will not be the only issue, it should be also precise and accurate movements also on X, Y and Z axis.

The www.makemyhobby.com people assured me that they can able to provide 17-20kg servo torque for under $75 on special order. But just for trial and error that amount is also out of reach.

So looking for precise solution either go for Servo or Stepper or make a U turn and use pneumatic, but again that will be difficult to get in India for cheap.

~ Time
Ashraf HZ

Ashraf HZ

Communications
06 Jan 2009
ice111
Hi,

In robotic arm, pulling heavy load will not be the only issue, it should be also precise and accurate movements also on X, Y and Z axis.

The www.makemyhobby.com people assured me that they can able to provide 17-20kg servo torque for under $75 on special order. But just for trial and error that amount is also out of reach.

So looking for precise solution either go for Servo or Stepper or make a U turn and use pneumatic, but again that will be difficult to get in India for cheap.

~ Time
Yep, both are accurate. However, you'll have better control with servos in some cases as they have feedback control. For steppers, you will have to assume the motor will perform with the given command. In most cases they do, but if an external factor effects the torque or angle of the stepper like a bump, then you would not get the position you require.
sauravgoswami

sauravgoswami

Electronic
07 Jan 2009
but controlling a servo motor is more complex procedure compare to stepper motors,unless if the purpose is met
Nishan

Nishan

Branch Unspecified
07 Jan 2009
Servo.
Dont worry.it will be ok.
sauravgoswami

sauravgoswami

Electronic
07 Jan 2009
yeah servo is always good for feedback systems,if you feel servo is good then go for it.....i would like you to share the results with us and alos the roadblocks
vasanthmbs

vasanthmbs

Branch Unspecified
14 Jan 2009
from my knowledge servo is correct
momin

momin

Branch Unspecified
08 Mar 2009
I'm facing the same problem these days. steppers are much cheaper than servo motors but the torque they deliver compared to their power consumption and weight is very poor. servo motors can provide large torque at 5 or 6 V (@200mA) only and they are only 45 gr. the motor weight should concern you if you are planning to attach the motors on the joints directly (no gears or belts) then the motor at the base joint should carry the end load plus all the other joints motors and links. please lets share our designs and schematics (my manipulator is a 4 degree of freedom and I'm using stepper motors)

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