Hello, I am a bit confused about this motor. It has 5 wires, blue, yellow, pink, orange and red. As far as I know, the red wire is not used. Also from what I read, blue and yellow pair are for one core and pink and orange pair belongs to the other. But wen I measure them. No matter what combination I used, I always get around 55.x ohms, shouldn't that it just has resistance on blue and yellow for one core and orange and pink for the other? why would I get 5.x ohm between blue and pink and yellow and orange? Thanks.
The motor is a unipolar motor, intended to by used with a unipolar motor driver.
One of the wires (usually the red one, but the colors can be different) is common, for connection to the motor power supply.
To convert the motor to bipolar operation, follow this tutorial.
Hi!
There are 5 wire stepper motors and there are 4 wire motors.
I have seen videos on Youtube showing how to connect and run a 5 wire motor in the same way as a 4 motor one. Sorry that I have not saved a link to them.
Search on Youtube!
Measuring is difficult because of freewheel diodes and the way the motor is build internally.
Normally a ULN2003 is used as a driver for a 28BYJ motor. There must be hundreds of Forum Threads about them.
...R
Hi,
Here is a lot of information about that motor: THIS PAGE
Thank you all for the replies.
@jremington, I read it else where that the center wire need to be cut to make it bipolar. but why? I never intended to use the center (red) wire any way, also what is the different between not using and cut it? After I cut it I still getting the sam result, any two wires still getting the same resistance. Shouldn't it be only two resistances for the two windings? Like blue and yellow have one resistance, orange and pink have another one but blue and pink and yellow and orange has none? Unless there are some internal wiring I don't know of.BTW, I am using a L293D, not a ULN2003 or any others.
Cutting is a bit extreme.
Just terminate in a connector or tape it up as it could present problems dangling around when the motor is operating as it is a centre-tap common as the above mentioned.
Read the recommended explanations and with that will be drawings to help you see why you are having problems.
Hi,
You need to look into more details.
You need to SEPARATE the two windings if you want to use the motor as "BiPolar".
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NOTE: This type of "Bipolar" motor with connected-together center taps CAN be changed to "Unipolar" with the use of a different more complex driver board and modifying the motor as shown in THIS PFD FILE
RewireTheSmallStepperMotor.pdfRewireTheSmallStepperMotor.pdf
-----------------( END COPY )----------------------
See the details. You have to open the motor cover and CUT the connection between the two sets of windings.
BUT: Why do you need/want to do that when there are easy-to-use and cheap driver boards for this motor??
Hi, sorry for keep drilling the subject.
When they said cut the common wire, does it mean physiclally remove the common wire from one winding to the other from the tiny PCB, so that the two windings are completely independent from each other? The reason I am confused because as is (without cutting the common wire). it works only one direction when I follow this tutorial:Overview | Arduino Lesson 16. Stepper Motors | Adafruit Learning System but I cannot get it to work on the Pi.
af1812:
Hi, sorry for keep drilling the subject.
When they said cut the common wire, does it mean physiclally remove the common wire from one winding to the other from the tiny PCB, so that the two windings are completely independent from each other?
Yes.
But I have no idea why you are going to all that trouble.
...R