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Author Topic: 4 Wire servo motor  (Read 1800 times)
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hi, i had some experience with 3 wire servo mototr controlled with arduino..is so easy.... i got a 4 wire servo motor with continuous rotation, if i attach the +24 and GND wire...it start to spindel, i was wondering if there is any possibility to control the 4 wire servo with some l292d and pwm for the positioning just like the 3 wire servo...i have searched in the internet about the datasheet of the motor, but i got nothing.... someone has an idea?

the motor is a DMES8G-03... there is also some kind of electroninc circuit attached... there is no info in the internet about it...
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Isn't that a stepper motor ?
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no... on the side of the motor there is "DC 24V Servo Motor"... also a stepper doesn't make continiuos rotation if i attach 2 wire... i said if i attach the +V and GND it make continuous rotation just like a dc motor...
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If it is this one:

http://www.cnczone.com/forums/servo_motors_drives/41986-cheep_servos.html

The extra wire is some kind of magnetic pickup
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yes that is... i have seen that post before,... but what is a magnetic pickup?... is there possible to control it just like a regular 3 wire servo motor with arduino?
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Adizhavo, 
Can I come in here with a similar question about 4 wire servos. I want to use some from an old (1970's) Swan Radio Control outfit. There are red, white, black and yellow wires. What do I need to connect to what to get them to work?
Regards
Mick
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Regards
Mick

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rookesy...i started to control the 4 wire servo just like a normal dc motor... i connected the phase wire (red) to +V and grounded the black wire..it started to spindel clockwise, you can control it easy with L292D or H-bridge transistors (clockwise and counterclockwise), you can divide the inputs in small delay with the arduino (maybe 10 milliseconds) and control the position by counting it.... but what i am asking is if it can be control as a servo and not like a dc motor...the servo has more torque since it always want to remain to that degree, that's why i have open this topic...........or maybe we can both apply some gear reduction or gear system..but that is another thing
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Quote
the servo has more torque

That is generally because of the gearing, take a look at the inside of a rc servo:

http://en.wikipedia.org/wiki/Servo_(radio_control)

So, apart from the gearing (that in the end are connected to a potentiometer), you also need some electrtonics that translate the servo signal from your arduino, to something that can contol the motor/potentiometer

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