Total beginner here trying to get my head round this..
I have a Nema 17 2 Phase 4-wire Stepper Motor (spec sheet attached) and Lysignal L293D Motor Control Shield.Amazon Link to shield and it says it provides 0.6A (peak 1.2A).
When I plug the motor in and provide 12v external power to the shield (via 8x AA battery). the motor spins for a bit (although erratically and doesn't seem to be happy at all) and then comes to a stop, and wont start again unless I remove and put a battery back in. The shield also gets hot very quickly during this. The Led on the shield also flickers as if there is come kind of issue with the current, dimming and getting brighter again etc while this is happening.
My question is is this motor trying to pull 1.5 amps and the shield cannot handle this? The motor does work for a little bit but it doesn't seem right.
I bought these parts based on a youtube video so that is either wrong or I am doing something wrong. I have also read through the beginners guide to stepper motors thread and can't seem to answer my question. (Probably me being stupid) but any help here would really be appreciated.
Also I see sometimes circuit diagrams are asked for, I have attached a full photo of the set up.
An L293 shield is for brushed DC motors, and unsuitable for stepper motors.
Especially for motors with an "Electric nozzle" :o of 3.2ohm and a coil current of 1.5Amp.
Get 'real' (current controlled) stepper motor drivers. Read this page.
Leo..
Edit:
It will probably work (sort off) if you lower motor supply voltage.
6volt is probably the limit before the L293 chips overheat and shut down.
I appreciate the reply.
Is it possible to lower the supply voltage with my set up? Or does that require something else?
Also, everywhere you read and watch about this l293 shield they all say 4dc motors or 2 stepper motors, are you sure they can't be run from it? lots of places are saying it can take up to 36 volts!!
Trying to learn this stuff online is a nightmare...
Four tiny toy motors, or two low-speed high-impedance steppers (not your 3.2ohm one).
Anything more than 16volt will blow the 16volt motor power capacitors on the shield.
12volt is potentially 12volt/3.2ohm= 3.75Amp in each motor coil.
The lossy L293 is reducing that to maybe 9volt, but that still is almost 3Amp...
That will eventually fry the chip and/or the motor.
Leo..
