Should I buy a 5V 40A Power Supply?

Other Hardware Motors, Mechanics, Power and CNC
1

I am currently working on a robotic arm project which will use a stepper motor (28byj-48) and 4 servos (HD-1800A). All of them operates under 5V. But I have future projects too such as a 5D wood CNC machine, which will work with NEMA motors (probably, we will see). But other other types of motors use different voltages such as 2.5V 4.5V etc.

What I think is in such cases I just buy a voltage regulator. And as far as I know, motor drivers steps down voltage too. So, should I buy this power supply or is it too absurd to buy?

2

Almost certainly the motors you choose for a CNC project will work better with 12v or 24v. The nominal voltage of a bipolar stepper motor is essentially irrelevant. It is the permitted current that matters.

Have a look at these links
Stepper Motor Basics
Simple Stepper Code

...R

3

Robin2:
Almost certainly the motors you choose for a CNC project will work better with 12v or 24v. The nominal voltage of a bipolar stepper motor is essentially irrelevant. It is the permitted current that matters.

Have a look at these links
Stepper Motor Basics
Simple Stepper Code

...R

Nema 23, let's say, works with 5.7V. What you suggest is using two to four times more than that. Sure, as far as I know, motor will work but either burn down or in best senario will heat too much.

4

compnaion:
Nema 23, let's say, works with 5.7V. What you suggest is using two to four times more than that. Sure, as far as I know, motor will work but either burn down or in best senario will heat too much.

You obviously did not study the link I gave you.

If you power that motor at 5.7v its performance will be crap.

...R

5

Robin2:
You obviously did not study the link I gave you.

If you power that motor at 5.7v its performance will be crap.

...R

Robin2:
You obviously did not study the link I gave you.

If you power that motor at 5.7v its performance will be crap.

...R

Now I looked at it. I see your point
"For this reason stepper motors are normally driven with a much higher voltage."

So, let me ask you this, can I still buy this power supply and use a voltage regulator later for that project?

And one last question, does this voltage rule apply to servos too? Couıldn't find info about it.

6

compnaion:
So, let me ask you this, can I still buy this power supply and use a voltage regulator later for that project?

I don't know what you mean by a voltage regulator?

Of course you can buy the power supply if you are not concerned that it may be of no use for the bigger stepper motors.

And one last question, does this voltage rule apply to servos too?

Assuming you mean hobby servos then the answer is NO. Servos are completely different and you must respect their voltage spec.

If you mean an expensive industrial servo that is used in place of a stepper motor then I don't know the answer to your question.

...R

7

Robin2:
I don't know what you mean by a voltage regulator?

Of course you can buy the power supply if you are not concerned that it may be of no use for the bigger stepper motors.
Assuming you mean hobby servos then the answer is NO. Servos are completely different and you must respect their voltage spec.

If you mean an expensive industrial servo that is used in place of a stepper motor then I don't know the answer to your question.

...R

Voltage Booster such as XL6009. These boost the 5V DC to a higher level voltage, some of them send around 4A safely.

I see. It is probably same for big servos too. Thank you for your answer.

8

compnaion:
Voltage Booster such as XL6009. These boost the 5V DC to a higher level voltage,

I am not familiar with that device but I would be surprised if it makes sense to boost a 5v power supply to a higher voltage for a stepper motor.

...R

9

Robin2:
I am not familiar with that device but I would be surprised if it makes sense to boost a 5v power supply to a higher voltage for a stepper motor.

...R

I see. I guess I will buy a cheaper 5V 5A adaptor. Thank you for your answers.