Micro Servo

Posted on | October 20, 2007 | Comments Off

Micro Servo

E-Flite S75 Servo to DC Geared Motor Conversion?

Hopefully someone can help. I have a E-Flite S75 Sub-Micro servo and I am trying to convert it to a DC geared motor. I read "Ted Pavlic's Servo Motor Conversion" on the net but it is vague and now that the servo is apart I don't know what to do. The servo motor has 3 wires red, black and blue. As well, this connects to the circuit board then to the pot (I assume). Now do I cut out the board and pot wires out which only the motor remains? If so, what is the blue wire on the motor for (signal?) should this be cut too? Any help would be appreciated. I just want to use the servo as a regular DC motor. Please...I'm not a whiz at this stuff can someone explain to me what to do in easy to understand language. Many Thanks!

The servo works by using a signal that represents a particular position, and angle that ranges from the servos extreme positions, this is important because the servo determines its current position using the pot, you'll notice that the pot has a key that fits into the gear that you attach the servo arm to.

you need to modify the pot so that it cannot turn, the simplest way would be to cut the pot's shaft or "knob" to a point that it does not reach the gear. The servo will now think that it is still in whatever position you leave the pot at before you close it back up. What you'll want to do is center your transmitter, and turn the servo on, and then turn the pot so that servo stop moving the motor in either direction, you have now calibrated center, or zero acceleration on this particular servo.

Next you need to modify either the main servo arm gear, or the casing so that the main servo arm gear can freely rotate over 360 degrees, continuously. There are physical plastic stoppers on the gear and on the enclosure casing, one or both of these need to be removed, or the servo will not be free to continuously rotate.

next reassemble the servo making sure that the pot will not be moved any more by the rotating of the main servo arm gear, if the servo is working just right for your application, then consider adding a small amount of glue onto the pot's shaft to make sure it doesn't wiggle into another position which will off-center it and make it run continuously.. you transmitter (controller) may also have center adjustments that will change the signal's center position as will, also fixing this calibration problem.

Micro-servo Robot-arm part 1

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Servo motor vs Stepper Motor?

So I'm involved in a school project where I'd like to use a small motor to automatically open and close blinds. My original thought was to use a micro servo, but I've never used one before and I'm insure whether or not I can make it complete the 2.5 rotations needed to close the blinds. Is this possible?? Or should I just use a stepper motor? I will be using a PIC micro controller. Thanks.

I'm thinking of the servo type used in model planes. Their travel is limited to less than 180 degrees. You would need to by pass the potentiometer inside with two reistors and remove it as it has 270 degrees of rotation. Plus you need to remove the stop built into the gear train. You can then drive the servo as a reverable variable speed motor with a simple circuit square wave generator (555) with an out put variable between 1 and 2 milli-seconds.
A stepper motor would be stronger. Use a stepper motor drive chip.
Very simple to count the pulses to control travel. The web site I listed should supply you with all you need to know concerning either method. Good luck.

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