I recently purchased a Kysan NEMA 17 stepper motor (4 wire - Bipolar) - I'm currently waiting on the driver module but thought it would be beneficial for me to learn how to control one without using the driver.
This means the first step is to make an H-bridge - I'm aware I need to make it using transistors but I don't really know how. I have googled some things but I would like a different take on it and get some extra info. A lot of circuit I'm finding is just using a chip for an H bridge.
Could someone perhaps indicate to me a circuit with transistors, resistors, and connections with the 4 wires from the motor to the arduino. I don't really need push buttons - I just want to see the motor spin
Well that sort of bipolar motor really wants a chopper drive, not H-bridge (it would be
dual-H-bridges BTW, one for each winding).
If you have a 4.2V power supply you could use H-bridges, but you'd not get the motor
to turn very fast at all.
Bipolars with low resistance windings like this are meant for constant-current chopper
drivers.
An H-bridge for low voltage high current can be done two ways - either a proper
MOSFET H-bridge setup with all n-channel devices and some driver such as HIP4081
to drive them and generate bootstrapped gate drive.
Or you can use complementary darlingtons, and 6V supply (the darlingtons will waste
2V at least, so still nominally 4V to the windings).
The Pololu A4988 -is- a chopper driver, so you are set.
Basically, it is a dual H-bridge that is connected as a constant current switch mode regulator, and the stepper windings are the inductor in the circuit -and- the load.
Can you perhaps provide a circuit i could build for learning purposes just to get the motor working without using the driver - id like to actually learn whats going on
