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Blog de c00alvin
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How to deduce stepping motor wiring? publié le 07/11/2019 à 08:46
There are a lot of fun projects you can do with stepper motors salvaged from old printers or disk drives. However, it isn’t always clear how to connect to some strange motor with no markings or schematics.
The basic idea is simple. Using a special jig, connects an LED across two random pins and spins the motor. If the LED lights, you’ve found a coil. You just don’t know which coil, yet. You can also short two wires and note when you feel resistance when you spin the shaft.
This gets a little trickier with some motor types, for example those stepper motor with encoder, which won’t do anything to drive the motor. Others have a case ground wire. Steppers have either 4, 5, 6, or 8 drive wires so if you have one more than any of those numbers it is likely a ground wire.
There are other ways to identify the pinout, especially if the motor has 4 or 6 wires. For a 4 wire motor, you can measure resistance until you find a pair that read a relatively low resistance.
Then you simply have to guess which one is A and which is B. If you guess wrong, the motor will spin backward, as these are bipolar stepper motor.
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