The supply of the mosfets in the project is wrong, you have used VEE which is a -5v supply, if you replace it with Vcc or any other positive supply it works fine.
Alex
Thanks for your answer, I have already drive that kind of motor but now I think my motor is not unipolar. There is no common. All resistance of pins are the same. I think the connection is star wiring. Now, I am testing by using ten irfz44 driver. I use two driver for one pin. One is for power and the other is for ground. Now, it is going to ok. Thanks for ur sharing knowledge.I think you mean a unipolar motor, it has 5 wires, 1 is the common and the other four are the 4 coil sides.
It is much easier to drive than a bipolar, you don't need an H-bridge, connect the common to the positive supply and use four low side switches (uln2003, transistor, mosfet) to enable each of the coils
You can drive it with an ULN2003 or discrete transistors, check:
Stepper Motor interfacing with Microcontrollers tutorial: Step Sequence : 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes
Stepper Motor interfacing with Microcontrollers tutorial: Connecting Stepper Motor : 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes
Also check the drive modes Stepper motor - Wikipedia, the free encyclopedia
https://upload.wikimedia.org/wikipedia/commons/8/85/Drive.png
Alex
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