Servo frequency can someone explain for me please!!

[stunks]

Am not to sure how this work and so on, so what is servo frequency and how does it works? Is the higher the frequency the better the serso works?

[PeteStewardson]

Am not to sure how this work and so on, so what is servo frequency and how does it works? Is the higher the frequency the better the serso works?

Servos work with a PWM signal. So say 333hz means each PWM cycle is 330/th of a second. Then to move the servo to a position it controls the amount of that 333/th of a second that the signal is on and off. If the split is 50/50 the servo is in the middle.

The frequency doesn't really matter at the end of the day. It will maybe make the servo faster if it uses a higher frequency, but then it's not going to be something you notice as you don't work that quick

[Andy from Sandy]

For a standard servo it works on a pulse width from 1mS to 2mS that is 0.001S to 0.002S. The frame rate is how many of these pulses the servo can work with in any one second. The typical output from a receiver is 50 pulses per second or 50 frames per second. It is this low because that is all most analogue servos can cope with. SOme of the Futaba receivers are designed to work with digital servos only on certain channels so I would expect that to outputting 200 to 250 frames per second.

On our FBL controllers and gyros the frame rate is very much higher. The digital servo is capable of operating at 250 frames per second.

If you have a servo that uses the narrow pulse width of 760uS then it can operate at 333 frames per second. There is a higher rate of the order of 500 FPS but I can't remember the actual figure.

[cjcj1949]

The fraame rate is how often the servo gets updated information. With a flybarred system the updates only come from the pilot on cyclic, so analogue rates are ok and no advantage in going digital, although a digital servo may be better in other ways. On the tail though the updates come from the gyro and a good gyro should perform better with digital and higher update rates. The same applies with flybarless on cyclic. The control inputs come from gyros feeding a computer and in principle the higher the update the better. There may be problems if the tail gyro or flybarless system works more slowly or nearly at the same frequency as the servo, but in reality the frequency figure is a maximum and the real servo frequency will be slaved to the input.