If you want to use the LMD H-bridges to control your steppers, you can; you just need to provide an external circuit that does current control. The reason that a DC motor doesn’t require a current-feedback chopper is that it has significant back-EMF while rotating. You can do that very manually using a couple of comparators and a or a flipflop or you could probably also make an L work for you here too. That diagram refers to a 5-wire stepper. Two or three hours spent thinking and reading documentation solves most programming problems. A dc motor reverses direction by reversing polarity. Tell us what you are using for a power supply, and we’ll go from there.
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You need to get a proper stepper motor driver board that takes step and direction signals from the Arduino motod has the ability to limit the current to protect the motor while driving it with a high voltage – 20, 30 50 volts.
Lmd18200 H-bridge Stepper Motor Driver Power IC 3a 55v
A stepper cannot do that, so if omtor don’t explicitly control the current then you will just overheat things. His motor has 6 wires unipolar but he is only using 4 so he still has to energize two windings at all times. An L just bundles up the steppeer and flipflop that I mentioned in the previous paragraph.
Two or three hours spent thinking and reading documentation solves most programming problems. MarkT Brattain Member Posts: You don’t need to control the current, because the motpr of the motor kind of do that automatically: I hope this happens because it seems the chip is quite popular. A stepper motor reverses direction by energizing different coils in a specific sequence.
H-bridge chips are not intended for driving high current stepper motors.
LMD18200 H-Bridge Module for DC Motor
Firstly the LMDT is a single H-bridge, so you would need two of them, and secondly that motor is for a current controllng chopper drive, not a fixed voltage drive.
To reverse directionthe sequence is executed in reverse order. Unlike a dc motora stepper motor requires power to maintain a motionless position.
If you used an L as the H-bridge, you would typically use an L as the current chopper and step controller. A bipolar stepper motor REQUIRES two H bridges to drive it, but it also unless it is a very low-power model with high winding resistance also requires a current-control circuit.
Driving stepper motors with H-bridges is like eating spaghetti with a single chopstick. Robin2, I’m having a hard time wrapping my head around the idea of driving a stepper motor by reversing coil polarity.
Is the principle that by reversing polarity the motor will turn by magnetic repulsion as opposed to attraction or vice steper It is either moving in 1,2,3,4 order or 4,3,2,1 order. Is it referring to unipolar motor?
LMD H-Bridge Module for DC Motor – Electronics-Lab
The reason that a DC motor doesn’t require a current-feedback chopper is that it has significant back-EMF while rotating. Lots of confusion in this thread. I thought that a stepper motor could only work by attraction. The ONLY thing that changes is the sequence.
I’m not expert,it clear, so your comments raise some further questions. You have not provided a schematic of how you wired the chip or specified the power supply you are using to power the stepper motor or posted your code so there is not much we can do with no information other than your report that it is not working. In order to understand this, you need to understand the difference in operation of a dc motor verses a stepper.
Are you referring half-step mode?
LMD H Bridge DC & Stepper Motor Controller IC
They are really intended for driving DC motors. Before I bought some stepper motors I did some research. See the attached jotor for the sequence.
There are some circuits with several condensers necessary probably to pass the pick current and some diodes stepper avoid probably parassite current. It didn’t take long to discover that companies like Allegro know more about driving stepper motors than I will ever know so I decided to use an A chip. Try Ebay – search for 3amp or 5amp stepper driver boards. That diagram refers to a 5-wire stepper.