Modify velocity of a servo motor

Forum 2005-2010 (read only) Hardware Interfacing
1

Is it possible to decrease the velocity of a servo motor?
cheers!

2

Hi,

you can reduce the voltage of the motor to reduce its speed. The easiest way is to use a PWM output of the arduino and drive a MOSFET with this output. This MOSFET drives the motor.

Mike

3

This MOSFET drives the motor.

It would also drive the servo electronics. I have a suspicion that they would not be amused by being switched off and on many times per second. But this is just a gut feeling: I don't have any practical experience with trying this.

Putting a really fat filter cap on the output of the MOSFET (making the circuit into something more like a switching power supply than a PWMed motor drive) might take care of this problem, if it actually exists (maybe it won't: an RC vehicle is a pretty noisy electrical environment, so there might be adequate filtering in the servo circuitry. But I wouldn't bet on it).

Ran