Hello everyone
We are having our project where we are running 3 1.5n.m stepper motors and 2 12n.m stepper motors.
We planning to use only one 12V battery to power all motors, is this possible or more batteries are needed, anything like electrical connection that we might use to give us more terminals so we connect all motors and it will perform well?
It is our first time using motors and batteries so any info would help
Thanks in advance
It is technically possible, but it depends on how many amps that battery can output.
Hi, @darth_plagiarism
Welcome to the forum.
Can you please post links to data/specs of your stepper?
What stepper driver are you using?
Do you have a battery in mind?
If so what are its specs?
Thanks.. Tom... 
How much CURRENT does each motor require?
The load created by each stepper to a large part depends on how much work the stepper is doing. Running continuously under load vs moving to a position and staying there for some time then moving again.
And as asked above, what is your 12V batter. I would think an automotive 12V battery would be fine 
it is 18Ah battery, will put the specification of the motors
That is the battery's capacity, it does not tell you how much current it can supply.
Hi
i will use 3 stepper motors with the following specs:
for the other two here is a link of their specs: (cant attach pics as new member)
https://www.omc-stepperonline.com/nema-23-bipolar-3nm-425oz-in-4-2a-57x57x114mm-4-wires-stepper-motor-cnc.html
(cant put more than two links, please see the next comment)
the application requires continuous rotation for about a minute then it will stop.
for battery I will use 18Ah, so is it sufficient or more batteries are needed?
also the output (terminal) of the battery only fits for one motor, how can I connect multiple motors to a single battery? is there something like an electrical connection that I can use?
more info about the battery I have:
2A for three motors
3A for the fourth motor
4.2A for the fifth motor
Sorry tried to look on the battery and this is all I got.
If there is nothing that helps in this pic.
How can I test my battery to know how much current it supplies?
It would be best to get the data sheet for the battery.
What is the project/application here?
Will try do so, but it seems this is made by a local company which provides no info online, even in store I asked for data sheet but they don't have.
The application here is PV panel cleaning and tracking systems
Hi,
That battery is untraceable with a short Google search.
However here are the specs for a similarly rated SLA, it can give you the capacity and runtime for different load currents.
Hope it helps.
SB2490-dataSheetMain.pdf (137.6 KB)
What are your stepper motor drivers?
You will be connecting the drivers to the batteries and the driver to the motor.
You will need to provide a fuse in the battery supply cables as the battery is capable of 100A, or more, into a short circuit. This would vaporise any controller or leads in seconds.
You would connect your batteries and motor controllers together with lugs like these, you can stack the lugs one on top of the other.
Tom...
That's a lead acid battery. Like a car or MC battery. My guess is it gives some 20 A at least. Momentarily much more.
The datasheets you quote are for 0.6Nm and 3.0Nm steppers, not 1.5 or 12.
Note these are holding torques, not dynamic torque (which is significantly smaller).
You motors are 2A and 4.2A - which stepper drivers are you thinking of using?
Note that the battery current draw will typically be less than the motor draw as stepper drivers act as step-down power-converters.
What speeds are you wanting from these steppers? The lower the supply voltage to the driver the lower the max motor speed and more quickly torque drops with speed.
Steppers and battery power raises flags for me - steppers are very inefficient and not really suitable for traction purposes. Typically they are used for motion control applications like CNC machines.
I was considering L298 but it seems it is not capable to provide the needed current for the 2 big motors, what drivers do you suggest for such application?
Modern steppers are low impedance and require stepper drivers, not DC motor drivers like the L298
For high currents there isn't going to be a single-chip stepper driver able to handle it, so the cheapest options are cheap drivers such as the Gecko drives and similar budget units.
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