I have 4 NEMA17, with a CNC shield and a DRV8825 driver for each. I want to power it with LiPO batteries. Looking for advice on this.
Hello @stecla and welcome to the RobotShop community,
Could you give us more details about the motors you have? because Nema 17 is an indicator of their size, not their power.
What I can see is that the motor controller works between 8.2V and 45V but that is a very wide range to choose from. However, you can find many options for LiPo batteries here.
For now, I suggest checking the following guide:
If you need further assistance don’t hesitate to contact us!
hi, thanks!
My NEMA 19 motors are 1.7A.
I want to use 2, 4 or 5 in one project.
I don’t have experience with these kind of batteries. Kan I just use them as 12V or 24V supplies or should I use a battery controller in between of some sorts ?
*Typo: NEMA 17
1.7A per coil? What about the voltage?
I strongly suggest reading the How Do I Choose a Battery? guide, that will answer a lot of your questions.
Kan I just use them as 12V or 24V supplies or should I use a battery controller in between of some sorts ?
I’m guessing you’re talking about a voltage regulator and that depends on the rest of the electronics you have to power (if you want to power everything using the same batteries). Take a look at this example from the guide I mentioned earlier:
Continuing the example above, where we chose a 12V microcontroller and 4.8V to 6V hobby servos, we have the option of using one (larger) 6V battery pack and a step-up voltage regulator. A voltage regulator does exactly as the name implies; it regulates the voltage. In our case we would need one which can accept 6V input and step it up to 12V. Choosing a lower motor voltage does not automatically mean the list of motors available to you will be low power. However, a high voltage motor (36V, 48V, 60V) tends to be reserved for large DC motors. The second approach is to first select the ideal motor and design your robot’s electronics system around the indicated nominal voltage. Both approaches have their advantages and disadvantages and it is up to you to choose which you prefer. Voltage dividers allow you to power electromechanical devices at different voltages. Voltage dividers are purely electrical devices with no programming involved. If you do not want to use voltage dividers, most electronics operate at 5 to 9V, so choosing either 6 or 9V as your robot’s supply voltage is the best choice (never assume an electronic device operates at 6 or 9V: you always need to read the supply voltage specifications for each electronic component). The other option is to use two different power supplies: one for the motors and another (smaller one) for the electronics. Should you wish to operate your robot at 9V, you can often still choose a 12V motor, though you must keep in mind the rpm will be less that that listed (estimated as a fraction of the nominal value) and the motor efficiency will be slightly reduced.