12 march 2012
As i have mention before, i think stepper has the best characteristic to be use in my project. so, i learn more about stepper this week. Stepper has many types. we have to choose it based on number of step that it produce.
First of all, I simply choose a stepper with 50 number of step. There are six wires emerging from the stepper motor: two red, two yellow, and two grey. We will call the wires R1, Y1, G1, R2, Y2, and G2 where the letter is the first letter of the wire's color and the number is to differentiate them. The next step is, measuring the resistance to determine the connection. Systematically we connected the testing leads of the multimeter to pairs of wires coming out from the stepper motors and put the measured results into the following simple table:
R1
|
R2
|
G1
|
G2
|
Y1
|
Y2
|
|
R1
|
-
|
117
|
-
|
117
|
-
|
|
R2
|
-
|
-
|
117
|
-
|
117
|
|
G1
|
117
|
-
|
-
|
234
|
-
|
|
G2
|
-
|
117
|
-
|
-
|
236
|
|
Y1
|
117
|
-
|
234
|
-
|
-
|
|
Y2
|
-
|
117
|
-
|
234
|
-
|
All of the above results are measurements taken in Ohms. Infinite resistance
is represented by a '-'.
Where the resistance between two wires
is infinite we know there is no connection between those two wires within the
stepper motor. For example, between R1 and R2 or G1 and G2. We have two
different values of resistance between the other wires - 117 Ohms and 234 Ohms
with one being half of the other. This is because this stepper motor has four
phases and therefore four identical coils. When the resistance measured between
two wires is 117 Ohms, the wires are connected across one coil, and when the
resistance is 234 Ohms the wires are connected across two coils.
R1 is connected to G1 and Y1 across one coil. R2 is connected to G2 and Y2 across one coil. G1 and Y1 are connected across two coils, and G2 and Y2 are connected across two coils. None of the 2's are connected to any of the 1's. Therefore we can draw the following simple diagram of the wiring of this stepper motor:
R1 is connected to G1 and Y1 across one coil. R2 is connected to G2 and Y2 across one coil. G1 and Y1 are connected across two coils, and G2 and Y2 are connected across two coils. None of the 2's are connected to any of the 1's. Therefore we can draw the following simple diagram of the wiring of this stepper motor:
The four live
wires are G1, G2, Y1, and Y2, and there are two common wires R1 and R2
Here i attached some picture as for reference:
.
Now, I know how to connect stepper motor and do simple programming to test it. =)
