There are two fundamental excitation sequences - full steps at 4ex and 5ex and half steps at ex. Current limiting can be either complex or simple. The simple alternative is to measure the combined return current from all half bridges. The current is shared between typically 4 coils and assuming the coils are reasonably similar, there won't be big variations in individual coil currents. The low nominal coil voltage is what usually throws people.
That only means that you get nominal current with that DC voltage, but it has little significance in actual usage. The coil inductance will resist current rampup and you need a significantly higher voltage to drive a useful current throug the coils at max working speeds.
Quote from: Kremmen on December 30, , pm. Well, yes and no. The polarity needs to reverse, but to do that you do not need H-bridges at each node of the ring. The only thing you lose is that you cannot arbitrarily decide the current direction for each coil individually, regardless of the others.
There might be a functional stepping sequence that cannot be implemented this way but i am willing to bet it is not significant. That can be done equally well using half bridges. What drivers? Sure, it is your project to do as you please. Just wanted to make you aware of different alternatives.
Youtube channel :Taking wierd stuff apart. Very apart. Mike's Electric Stuff : High voltage, vintage electronics etc. Hi DebboR, I also have a couple of Step-Syn 5-Phase motors that I have had for a while and have been looking a building a driver for them I can buy one but where is the fun in that.
I have the which is a 5-phase motor. I looked three options for driving the motor, 1. Now one guy who has already done this is Fana Akbarkan A. The stepping runs great following the LEDs but the motor just won't budge. One more time: in this scheme the coil voltages ARE reversed in due time. That is exactly what i tried to explain earlier. Using full H-bridges is a waste and bad design.
Unless for some curious reason you really need to drive each coil completely in isolation. Quote from: Kremmen on January 02, , pm. Hi DebboR I agree with Kremmen on this after trying both. Registration is free. Click here to register now.
Register Log in. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser. Thread starter mhtavallaie Start date Jul 26, Status Not open for further replies. I am using 12 volts for the circuit and volts to enrgise the stepper motor.
Are you sure you have the phases connected in order? Click to expand Sounds like they might be NPN if you trigger them with 12V. The output of the uln is inverted. If you are using NPN's, then you are actually turning each phase off in sequence. A simple inverter on the uln inputs would correct this problem. Look for some PNP power transistors, or just use 5 small signal NPN's as emitter followers on the outputs with a current limiting base resistor to each of the BU's.
Rgds Hadi. Norich New Member. I am trying to create driver for my motor. According to motor datasheet, i need to supply v. I attach the schema of the driver plan that i use. Check out the video to see how everything works. Did you make this project? Share it with us! I Made It! Remote Control Light Switch by alanmerritt in Arduino. Samo Jakov 2 years ago. Reply Upvote.
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