Equating complex number interms of the other 5. Thanks in advance, Ruben. I’ve constructed a prototype Y-axis table for my CNC, but when it comes in contact with a little resistance from whatever source, the motor tends to bog down and not rotate. Yeah, this is just a prototype and I was worried about one transistor “hogging” the current. It seems mosfet get burned every time. Distorted Sine output from Transformer 6. Should you however be stuck with a FET like the IRF that really needs a high voltage to switch efficiently then use the following circuit:

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It is not a true logic level mosfet, it needs some 10 volts. The two P-channel mosfet will be driven by transistors. For this, I believe someone Joerg mentioned a driver circuit specifically for this. As for the mosfets, these are my favorites-yet a little bit expensive.

Stepper Motor Driver Problem — Parallax Forums

MarkT Brattain Member Posts: Also, if you have the gate floating, the state of the mosfet could be undefined. This time has been decided by lot of iteration of different timings. He who knows not and knows not he knows not: Stepper Motor speed Control As chuckey said, stepper motors are best used with current source drivers.


It seems to me a bit pointless going to the trouble of building a H-bridge for that stepper motor.

MOSFETs for stepper motor control | Electronics Forum (Circuits, Projects and Microcontrollers)

Stepper Motor speed Control Hi Everyone, My project is to make a Bipolar stepper motor drive using discrete components. I suppose that the pulsing circuit that you will use, will strpper the same supply and output power as irf5540 What I have so far. My motors already have the bevealed part on the shaft, so my set screw really has an easy time locking it.

Originally Posted by Yosmany It would be convinient to you to send me a ‘classic’ schematic of this circuit?

It doesnt look dedicated to a steppermotor though, more to drive a rgular DC motor. Like the diagram at the top of the page here.

Perhaps one of the wires is corrupt. Those Who Can’t, Teach. Now you want to put current through a coil. Also TO is not recommended for currents above a few hundred milliamps, you should be using TO transitors which can easily drive several amps. Great, that is good to know. A value between ohm and 1 kOhm. At first glance I don’t see how adding an op-amp will improve the on-time switching speed, it seems the speed is limited by the RC values of the winding I’ve chosen it would really help us if you can post your motor specs, but I’ve mentioned this previously in this post – maybe you don’t have the specs with a “surplus motor” but I can help with a method to mesure them.


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MOSFETs for stepper motor control

Every time I tried with new IRF, but any of them worked only for first time. The propeller pin at 3.

I’d like to cnc my dremel tool using something similar to your circuit. This means that there is one if your stepper has 5 wires like mine or two common wires if your stepper has 6 wires.

At 3 April8: Related to source pull simulation for rectifier 0. A simple hand measurement of the torque of the motor shows that it has far less torque than with 12V. Hi vish, to overcome this problem you should use a linear speed profile, where the step rate should be incremented linearly using constant acceleration.

If your load is highly inductive, like motors, care should be used in diodes choice: