Society of Robots - Robot Forum

General Misc => Misc => Topic started by: ServoCity on November 14, 2013, 10:24:59 AM

Title: How servos work - helpful links
Post by: ServoCity on November 14, 2013, 10:24:59 AM
Our tech team fields a lot of questions regarding how servos work, how to calculate power and speed, etc. So we've created a few pages that some of you might find helpful!

What is a servo? http://www.servocity.com/html/what_is_a_servo_.html (http://www.servocity.com/html/what_is_a_servo_.html)
How servos work: http://www.servocity.com/html/how_do_servos_work_.html (http://www.servocity.com/html/how_do_servos_work_.html)
What servo to use? http://www.servocity.com/html/what_servo_do_you_need_.html (http://www.servocity.com/html/what_servo_do_you_need_.html)
Servo Power and Speed; http://www.servocity.com/html/servo_power___speed.html (http://www.servocity.com/html/servo_power___speed.html)
180° Rotation info: http://www.servocity.com/html/180o_rotation_information.html (http://www.servocity.com/html/180o_rotation_information.html)
Connector types: http://www.servocity.com/html/connector_types.html (http://www.servocity.com/html/connector_types.html)

Our team is always available for your specific questions as well: [email protected] or 620-221-0123.
Thanks,
ServoCity
Title: Re: How servos work - helpful links
Post by: waltr on November 14, 2013, 10:38:01 AM
Nice. These should be very useful.
Maybe the Admin can make this a 'sticky' for east reference.
Title: Re: How servos work - helpful links
Post by: jwatte on November 14, 2013, 04:53:31 PM
I think it would be better if it was actually accurate.

Quote
A Servo is a small device that incorporates a three wire DC motor, a gear train, a potentiometer, an integrated circuit, and an output shaft bearing.

http://en.wikipedia.org/wiki/Servomechanism (http://en.wikipedia.org/wiki/Servomechanism)
http://en.wikipedia.org/wiki/Servo_(radio_control) (http://en.wikipedia.org/wiki/Servo_(radio_control))
Title: Re: How servos work - helpful links
Post by: ServoCity on November 14, 2013, 05:06:08 PM
I think it would be better if it was actually accurate.

Quote
A Servo is a small device that incorporates a three wire DC motor, a gear train, a potentiometer, an integrated circuit, and an output shaft bearing.

http://en.wikipedia.org/wiki/Servomechanism (http://en.wikipedia.org/wiki/Servomechanism)
http://en.wikipedia.org/wiki/Servo_(radio_control) (http://en.wikipedia.org/wiki/Servo_(radio_control))

We have changed it to read: "A servo is a small device that incorporates a TWO wire DC motor..."
Thank you for pointing this out.
Sincerely,
ServoCity
Title: Re: How servos work - helpful links
Post by: jwatte on November 15, 2013, 10:47:47 AM
There's nothing that says that a servo has to be a DC motor, or a particular number of wires.
As stated on the Wikipedia articles I linked to...
What you are describing is a hobbyist RC servo. The qualifications are important!
"Servo" means any actuator drive that has a sensor, feedback loop, and controller. There are lots of servos that don't use a potentiometer, instead using higher-quality sensors (optical, magnetic, etc.) There are lots of servos that don't have a three-wire wiring harness. There are lots of servos that don't come with horns. There are lots of servos that use AC motors.