What is Servo: Definition and 76 Discussions

A servo tab is a small hinged device installed on an aircraft control surface to assist the movement of the control surfaces. Introduced by the German firm Flettner, servo tabs were formerly known as Flettner tabs. Servo tabs are not true servomechanisms, as they do not employ negative feedback to keep the control surfaces in a desired position; they only provide a mechanical advantage to the pilot.

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  1. P

    Arduino Programming for Servo motor

    Hi all. I am working on a project that requires using an arduino microcontroller to control the motion of a servo motor. The original code is of the form: #include <Servo.h> Servo myservo; // create servo object to control a servo // a maximum of eight servo objects...
  2. I

    Design the software and the hardware for servo controllers

    I search information about design the software and the hardware of controllers especially servo controllers. I have several questions about this subject and I will glad if you can write your opinion and add some relevant links. A. I want to understand these things: A.1. What is servo...
  3. F

    Looking for a comprehensive servo motor book?

    Hi, I'm wroking in a project about robotics that uses servo motors. Can someone recommend me a book that completely detail how a servor motor work. If it includes robotics would be great. Thanks
  4. T

    Is My FBD Servo Link Simulation Unstable Due to Equation Errors?

    Homework Statement I have this system (attached) which I need to model using simulink (attached). Homework Equations My available variables/constants are: y, y', tita, tita dot, tita double dot, m=0.1, c=0.1, k=300, l=0.3. I derived the following equations from the free body diagrams; y =...
  5. K

    How Do You Calculate Torque for Servo Motors in a Pick and Place System?

    Hi all, I am doing a project on Pick and Place system with 2 Servo based Axis control system. I am struggling in selecting the servo motor and torque calculation. My pick and place system consists of 2 Servo Rotary axis which indexes from 0 degree to 180 Degree with 1 Sec acceleration and...
  6. F

    Servo motor: what is the continuous servo motor?

    Hello Forum, there are two typeos of servo motors. One of them is called continuous. does it mean that it can rotate to any angular position, between 0 degrees and 360? The other type (the non continuous one) still rotates at any angular position, but only within a limited range, like 0 to...
  7. L

    Pulse Width Modulation & Servo Motors Explained

    Hi everyone, I am really trying to get the concept of Servo Motors and am sort of stuck on something, particularly how the motor gets its Pulse Width Modulation. I understand the 0 to 5V with a period of about 20ms and different pulse widths generate different angular positions. What I am...
  8. G

    <controlling fire extinguisher with a servo> :frown:

    <controlling fire extinguisher with a servo> please help :frown: Hi, I am building a robot that can extinguish a fire on it's own with the help of a couple of sensors and a fire extinguisher. I want to control the lever of the extinguisher autonomously with the help of the...
  9. R

    Stuck with calculating torque needed for Robot servo motion

    Hi there, I was wondering if you could help me with a quick problem. I should probably know this but for some reason I am getting confused between different points of view: If I wanted to calculate the maximum torque required by a motor shaft to spin a mass at the end of a rod connected...
  10. H

    Help for Junior Project Design Class - Servo Motor & 555 Timer

    I'm building a robot for my junior project design class and I'm using a servo motor. I'm using a 555 timer as a variable speed controller. I was wondering how to get a negative signal from the timer. Any ideas?
  11. K

    Servo Motors: Precisely Control Force & Pressure

    A normal servo motor gives a highly accurate response to an input, with the output being an angular position of the shaft. For example, give it a 2ms pulse and it might go to +63 degrees. I am wondering what sort of motor (or system) is used to control an amount of force or pressure. For...
  12. U

    Control of air jet and servo motor

    Hi, I am trying to control the height of a ball in a jet stream of air. The height is being calculated by a camera and the air jet coming out controlled by a servo motor (connected with a butterfly valve). I found the open loop response by giving a step input, i.e I opened the value and...
  13. D

    Help calculating torque of servo for gripper to hold part.

    Homework Statement I have this problem. I'm trying to calculate the minimal servo torque for the gripper to hold the part in place. http://img52.imageshack.us/img52/8784/96199865.jpg Mass of load is 170grams. u friction between load and walls is 0.5. the diameter of wheel on which the...
  14. V

    Timed Servo Control for Computer Programmers

    I am a computer programmer and not an electrical engineer so please pardon my ignorance in your field. I am interested in turning a knob 5 times per day, the fifth turn is for returning to the neutral position at the end of the day using a servo (unless you know of another method). I...
  15. Y

    Locate a servo or similar device

    Hey guys...i'm trying to locate a servo or similar device that has just three basic stipulations... It needs to: -Be able to turn a thin 6 inch diameter plastic wheel (negligible weight, no resistance as it's not attached to anything but the servo) -Complete at least a half revolution in...
  16. Z

    Build a Timed Servo with Basic Knowledge | PF

    Hey PF. I just joined, and I got a question. I want to make this 'timed' servo, making it go from -25 to 25 degrees angle spread over 1 or 2 seconds, and then go back and repeat. I know this might be difficult, but if you can help me, please do! I think I'll have to program a...
  17. S

    Building a 5 Wire Servo Controller

    Hi, I am supposed to build a controller for a 5 wire servo. I'm having trouble finding information online that appeals to electrical engineering folks. What are the 5 wires? I suspect there is power and ground, but that leaves 3 unknown connections :eek: I have a basic understanding...
  18. C

    What is a Retract Servo? Uncovering the Mystery

    I was browsing a hobby supplies site, and I came across retract servos. What are they? I know what a servo is, but I can't seem to find the definition of a retract servo. I've been searching for a while, and I'm sure it's there just staring back at me from the computer screen, but I'm not...
  19. M

    Servo amplifier to control dc motor

    hi, sorry my English isn't perfect but please try to understand : my teacher gave me a project in which i have to use a small dc motor,op amp,and a "servo amplifier" to control the rotation of the shaft of the motor, so can you tell me what is the servo amplifier? and how to use it to control...
  20. C

    Assembly( moving a servo by frequency)

    Hello, I am building an automated sorter for a school project. I have to sort 3 different sized blocks. I am using a infrared sensor to do this, I determine the size of block on how long the beam is broken. When the size of block is determined, the circuit board moves a servo motor...
  21. Cyrus

    MATLAB Standard PPM servo interface with matlab

    I need some help here. I need to have a standard PPM servo interface with MATLAB so that I can give it a command in simulink and have a response. I found this device, which eliminates the need to use PPM in simulink. http://www.parallax.com/detail.asp?product_id=28823 Basically, it...
  22. G

    Servo Motors for Small Satellite Landing Gear Project

    I am building a small satellite for my project in which I have to release a mechanism to eject the landing gear at a certain altitude before landing vertically. The landing gear will consist of spring-loaded rods, initially at 90 degree angle with respect to the circular base of diameter 2 inch...
  23. 2

    Servo motor duty cycle vs. supply voltage

    I have a servo motor that I'm controlling with a simple PID controller for a constant frequency square wave with varying duty cycle. My supply voltage is 5.17V with ~1V drop across my low side driver. The controller sits right around 50% duty cycle to keep the servo open to position A. A...
  24. wolram

    Electro Servo Valve: Reasons Why Not Used?

    A DOHC engine has the valves controlled by two servo motors, an engine speed encoder controls the valves possitions via electronics, this is an obviuos solution to four stroke ice valve control, what are the reasons why it is not used?
  25. E

    MATLAB Designing a Transfer Function in MATLAB for Servo Motor Control

    This post is cross listed at the below url https://www.physicsforums.com/showthread.php?t=73985 I'm attempting to use MATLAB to solve an electrical engineering problem dealing with controls... I'm trying to design a transfer function which will control a servo motor using what is often...
  26. F

    Find a Servo Controller for Your Project

    Shucks Howdy y'all. Well, I have to make a large servo (the motor will pull about 10 amps) which I can do using a PIC od an AVR; however, I'd like to get my hands on a dedicated servo controller if possible. Does anyone out there in internet land know where I can get my hands on a servor...
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