Product Tips & Tutorials: Servos
Servo Ratings
Posted by on 23 August 2012 04:51 PM

All RC servos have a three wire connector. One wire supplies positive DC voltage – usually 5 to 6 volts. The second wire is for voltage ground, and the third wire is the signal wire. The receiver “talks” to the servo through this wire by means of a simple on/off pulsed signal.

Sizes

Servos basically come in 3 different sizes, micro, standard, and 1/4 scale, to accommodate the different types of RC model they are being used in.

Speed and Torque Ratings

Speed is the measurement of the time it takes the servo to rotate a certain number of degrees. This has been standardized in most ratings to be at 60 degrees, or the time it takes for the servo to turn the wheel 60°. The smaller the number indicated in speed, the faster the servo is.

For example a 0.24 sec/60° servo rating means it will take 0.24 seconds to rotate the servo arm or wheel 60°. A RC helicopter tail rotor specific servo will have speeds up to 0.06 sec/60°.

Torque determines the maximum amount of force it can put out. This is measured in ounces per inch (oz-in) or in kilograms per centimeter (kg-cm). The larger the number, the more power it can exert. Most servos can run on 4.8v-6.0v and the torque and speed rating on the same servo will vary depending on the voltage supplied to it. Newer servos can run up to 2 cell lipo 7.4v which will increase the speed and voltage.


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