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Find Bipolar Stepper Motor Coil Pairs

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Find Bipolar Stepper Motor Coil Pairs
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  http://www.instructables.com/id/Find-Bipolar-Stepper-Motor-Coil-Pairs/  Food   Living   Outside   Play   Technology   Workshop Find Bipolar Stepper Motor Coil Pairs by randofo  on June 25, 2012 Table of Contents Find Bipolar Stepper Motor Coil Pairs ...............................................................................................1 Intro: Find Bipolar Stepper Motor Coil Pairs .......................................................................................2 Related Instructables ........................................................................................................2 Advertisements ...............................................................................................................2 Comments ................................................................................................................2  http://www.instructables.com/id/Find-Bipolar-Stepper-Motor-Coil-Pairs/  Author: randofo  Randy Sarafan loves you!My name is Randy and I run the Instructables Design Studio. I'm also the author of the books 'Simple Bots,' and '62 Projects to Make with a Dead Computer'.Since I am always making new things, subscribing to me = fun and excitement! Intro: Find Bipolar Stepper Motor Coil Pairs There is a really easy way to figure out which two sets of wired are paired on a bipolar stepper motor. Get an LED, and hold the anode and cathode to any of the motor'stwo electrical connections (respectively). Turn the motor shaft and see if it lights up. If it does not light up, change where the wires are connected and try again. Keepchanging these pairs until one set lights up.Once you have found a pair that lights the LED, it is fair to assume that the other pair of wires are also connected, and will also light an LED. You now have found andidentified the coil pairs and can start working with the motor.If the LED does not light up with any pairs, you can get a similar result by using a multimeter and measuring the voltage that the motor outputs when you turn the shaft. Related Instructables How to use aStepper Motor by JColvin91 Getting StartedWith TheMC33932 DualMotor Shield  byJayconSystems Drive a StepperMotor with anAVRMicroprocessor by The Real Elliot Arduino 6 wireStepper MotorTutorial byastrodan3 Attiny85 as aStep/Dir StepperMotor Controller by  john1a Running aUnipolarStepper Motorwith a BipolarDriver  bypieterjlouw Advertisements Comments 12 comments Add Comment   billgeo  says: Jul 26, 2014. 9:52 AM REPLY If you don't have a LED handy (unlikely, but it happens) here's another trick:Turn the shaft and note how hard it is to turn it.Now just short to wires at random and try to turn the shaft.If it turns as easily as before then try another pair until you find the pair that when shorted makes turning the shaft harder. That's your bipolar pair.  Machine  says: Dec 8, 2013. 4:15 AM REPLY Nice instructable. Thanks. I use steppers from time to time and have found this useful.  http://www.instructables.com/id/Find-Bipolar-Stepper-Motor-Coil-Pairs/    arnefl  says: Jun 26, 2012. 1:40 AM REPLY As it does not hurt the stepper if it's wrong, then plug it in at random- ABCDIf it does not work, then change the last 2 with each other. ABDCIf that does not do the trick, then leave it as is, but change the middle 2 with each other. ADBCThats it.If wrong rotation direction then mirror them so abcd becomes dcba  gabdab  says: Feb 26, 2013. 12:12 AM REPLY It works with any number of wires (4,5,6,8) I guess ?  pfred2  says: Jun 25, 2012. 6:13 PM REPLY Does the LED light no matter which polarity it is and which way you spin the motor shaft? It might due to back EMF. If you have a multimeter why not just useit on the ohms scale? No spinning required then. If you don't have a multimeter what are you doing playing with a stepper motor?My favorite thing is to hook two stepper motors up coil to coil, then spin the shaft of one, and watch the other go around. Magic! Good way to make sure bothof your motors are OK too. I'm sure there is some way of phase testing an unknown stepper motor doing that if you know the wiring of one of them.You can write that article randofo. Or just freak out your co-workers with the magic of a stepper motor being a stepper motor driver if you manually spin it.  iceng  says: Jun 25, 2012. 9:58 PM REPLY Selsyn motors used in WWII aircraft, filmaking and other pre uP eraas remote control is what you are discovering.A  pfred2  says: Jul 7, 2012. 2:02 PM REPLY I didn't discover it, I read about it, and I know it has been used for some strange mechanical linkage deals in the past. It is like a magic trick though,especially to people who know about electricity, and electronics. It just seems to work too well. Better than I'd have given it credit for working beforeI did it for myself.  randofo  says: Jun 25, 2012. 6:16 PM REPLY Lights up no matter which way you orient it. Learned this from someone who was doing research to use them as small-scale power generators. Alwaysthought this was a clever trick. LEDs will light up with almost all motors of this type.  pfred2  says: Jul 7, 2012. 1:58 PM REPLY Then it lights on one phase of the current. Either the forward, or the back EMF, depending on the lamp orientation. Because LEDs are polarizeddevices. Now I wonder if there is a way to combine 2 to figure out the motor phase?  nerd7473  says: Jun 26, 2012. 3:34 PM REPLY thats so cool randofo  porcupinemamma  says: Jun 26, 2012. 10:11 AM REPLY Darn... I thought you had invented a device to help with bipolar disorder, a rotten mental illness-I speak from personal experience. Your invention is very coolthough! Thanks for sharing :0)  Lectric Wizard  says: Jun 26, 2012. 7:43 AM REPLY Neat trick ! The LED will light in either orentation because the stepper motor is acting as an alternator, putting out AC. This is great example of working withwhat is at hand !! GOOD SHOW.
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