Let's Make Robots!

What type of motors are these?

I recently bought some motors of ebay.  They have opto couplers on them and they are a decent, see the picture.

How do I tell if they are stepper motors with encoders or servo motors with encoders?


Motors.jpg202.2 KB

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They look like DC motors, not stepper nor servos.

how many wires do eahc have coming out of them?

2 of them look to have 3 wires and 3 look to have 4 wires. They don't look like any stepper motors I have ever seen, and, they really don't look like any servos I have seen either. I am more inclined to agree with amando96, and his  DC motors comment.

I think that you can make a servo from a dc motor using a encoder? no?

Wires are 2 from motor 3 from encoder and 2 from motor 2 from encoder.

Can you use these types of motors for positional control then?

It's not a servo, sure, you can make one, but it's going to be difficult if not impossible(I don't know how much you know) it's simply a DC motor with an encoder, this is useful for locomotion on a robot, but you can't directly attach the wheels to motor, you'll need some form of gearing to bring down the speed and increase the torque.

I really doubt it's a stepper due to its shape and the openings in the metal. 99% sure it's a DC motor.




Yes I have had steppers in the past 1200oz down to 270oz, actually have some 270oz left.  I just bought these on ebay cheap and have just starting buying heaps of electronic parts and a scope.


So how can I work out max voltage on these?


if those are dc motors, then WTF are the extra leads for???

Maybe it could be just a built in tacho?


See new pic