Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: vipulan12 on October 12, 2013, 06:33:20 PM

Title: Improving Servos
Post by: vipulan12 on October 12, 2013, 06:33:20 PM

Can servos be made so that they can become more accurate like a stepper motor?
Can servos also have a 360 degree range rather than 180?

Title: Re: Improving Servos
Post by: jwatte on October 12, 2013, 09:15:59 PM

Stepper motors typically only has 200 steps per 360 degrees. Most servos (even cheap analog hobby servos) have more precision than that.
Yes, servos can be made, and are made, to support 360 degree rotation. Note that "servo" doesn't mean "RC hobby servo" -- a "servo" is any system that has a motor, a position encoder, a motor driver, and a closed-loop controller that combines input commands and the position sensor to determine how to drive the motor.

Here's a servo that has high precision, and does 360 degree rotation (being able to read the position across all 360 degrees): http://support.robotis.com/en/product/dynamixel/rx_series/mx-28.htm (http://support.robotis.com/en/product/dynamixel/rx_series/mx-28.htm)
This servo is used in the Darwin-Op humanoid walking robot.