New to all this but i have some questions regarding the battery output and if the voltage and current is sufficient enough, or too much for the Nema 23 stepper motor. The plan is to connect this Juicebox V Mount to a Stepper Motor Driver TB6600 4A 9-42V and from there connect to the stepper motor.
My concern is that, the V Mount battery says that its output is 14.8V and 10.4A. The TB6600 stepper driver takes anywhere from 9-42V and max output is 4A. Will connecting the V Mount battery to the TB6600, fry or mess up the TB6600 in any way? I read a post on this forum where someone stated that as long as the voltage is there, you should be okay. [Author: Robin2] The Nema 23 doesn't take that much voltage but each phase is 3A. I can alter the output current on the TB6600 to satisfy the motor but my concern is whether or not the TB6600 will be affected by the 10.4A it will be receiving.
If the case is that the current is too much, what approach can i take to limit the current?
I just want the motor to turn at this point. I'm not concerned with whether or not i am getting the most bang with this battery.
The battery capacity is said to be 150Wh - it is probably a substantial overestimate by the marketing folk. The motor has a rated current of 3.0 amps and a coil resistance of 1.12 ohms which amounts to about 10 watts. I would add at least 50% for a margin of error. In theory, your 150W battery should be able to operate the motor for 10 hours. I would not assume more than 5.
Stepper motors are very inefficient and are not really suited to battery power.
Make sure to set the current limit on your stepper driver to match the 3 amps permitted for the motor.
If i limit the current to 3A on the stepper driver, what will happen to the other 7.4A that are coming from the battery? Will it dissipate as heat? The stepper driver does have a heat sink, so i assume the driver will be hot?
mikesanders:
If i limit the current to 3A on the stepper driver, what will happen to the other 7.4A that are coming from the battery?
They won't come.
Electrical appliances only take the current that they require - provided the voltage is correct.
And, in fact, there won't even be 3 amps coming from the battery. The motor requires about 10 watts (ignoring inefficiencies) and at 14.8v that is about 0.68 amp. The motor driver in conjunction with the motor transforms the 14.8v and 0.68 amps into 3.36v and 3 amps.
Electrical appliances only take the current that they require - provided the voltage is correct.
And, in fact, there won't even be 3 amps coming from the battery. The motor requires about 10 watts (ignoring inefficiencies) and at 14.8v that is about 0.68 amp. The motor driver in conjunction with the motor transforms the 14.8v and 0.68 amps into 3.36v and 3 amps.
...R
I think you were right. I plugged in the wire that was connected to V Mount battery and connect it to my TB6600 and nothing happened. Everything was connected Arduino etc. I even altered the current limit to 0.5-1A on the driver and same thing. The lights didn't even come on the TB6600 stepper driver. I was able to run it with my power supply however so it wasn't damaged or anything.
My question is, where did i go wrong? I thought that since this battery is 14.8v and 10.4A, it would work. The TB6600 needed only 9V to turn on but the battery had about 16V [tested with multimeter], and still nothing.
Also, what battery would you recommend for this? I need a battery because i need it to be portable.
mikesanders:
I was able to run it with my power supply however so it wasn't damaged or anything.
Let's start with (or go back to) the situation in which you have the motor working with the power supply.
What is the power supply (volts and amps)?
Exactly how is is connected - make a simple pencil drawing and post a photo of the drawing.
Now, without changing anything else, disconnect the power supply and connect the battery in its place (a FULLY CHARGED battery.
Does it work?
If not make another drawing showing exactly how the battery is connected and post a photo of it. If there is more than one connection point on the battery make it very clear which one you are using.
I have a 30V 5A power supply. Ill post pictures of the two setups. If you are unable to make them out, lemme know and ill draw a diagram or schematic.
1st picture is power supply. If you look at the motor it is spinning and TB6600 LED is on. [Camera shutter speed caught the motor blur]
2nd picture is battery connected to power jack socket. [I realized that the female socket is rated for 5A when i just looked at purchase specs. Voltage is getting through although, as seen on multimeter picture. Not sure if this could be the issue. In the power supply picture, i am bypassing the jack. ]
The barrel jack receiver you used has red to the outer, and black to the inner pin.
Usually that should be the other way around.
You reversed the power leads.
The controller's protection against reversed power (a diode will do) is active and your module won't do anything until you connect the power the right way around.
The PSU works because you clamped red to red and black to black.
mikesanders:
If i limit the current to 3A on the stepper driver, what will happen to the other 7.4A that are coming from the battery? Will it dissipate as heat? The stepper driver does have a heat sink, so i assume the driver will be hot?
That's like saying "If you turn the tap 1/3 on, where does the other 2/3rds of the water go?"
Things take their rated current if provided with their rated voltage.
