Hi guys, so I'm trying to power three stepper motors with a power supply or three separate ones, not sure which would be the better option since the motors need 20 volts of battery, anyway I need to be able to charge the battery or batteries. Also the motors need to be connected by solder to the power supply(s). Either way the power supply needs to fit in a generally small space. So to recap:
-motors need 20volts
-motors power and ground need to be soldered to the power supply
-needs to fit in a generally small space
-I'm not sure if you could use one power supply and split the power three ways.

PLEASE help

 

Is the 20v the plate rated voltage on the motors ??
Also, what are the power (current) requirements for each.
You cannot generally power steppers using simply the actual plate voltage, at least, not get much in the way of high rpm

 

yeah so it says 3v per stepper, but they don't work right without 20v's so I don't know how to get 20 volts to all three steppers

 

The important thing is the motors should be operated at exactly the stated plate current, there are specialized driver IC's used in order to maintain this current throughout the RPM range.

 

Stepper motors are never driven directly from DC power supplies. A stepper motor requires that the different windings be alternately powered in a very specific four-step sequence. there is no way to drive them directly from a DC power supply.

 

Some IC solutions.
L297 + L298.
DRV8436
LMD1820
Et al.

 

Might help if you told us the name and specifications of the motors.

 

Might help if you told us the name and specifications of the motors.

Certainly, knowing the specifications is mandatory to decide which driver is applicable. Consider that there are two quite different major classes of stepper motors, being four leads and six leads, that use quite different driving arrangements.

 

-motors power and ground need to be soldered to the power supply

That almost sounds as though you are attempting it without a driver??
As previously mentioned, the current value for the motor has to be maintained exactly throughout the RPM range.
When I started out, it was done simply with a motor series resistor, then after which, some nice driver IC's have became available in order to ensure this..

 

Max over-simplifies it a bit much. For starters, stepper motors DO NOT RUN!! they STEP, and rapid stepping provides the apperance of running. The stepper motor MUST HAVE A DRIVER to make it step. So if the TS does not have a stepper driver to provide the sequences then the motor will not step.

 

, stepper motors DO NOT RUN!! they STEP, and rapid stepping provides the apperance of running. The stepper motor MUST HAVE A DRIVER to make it step. So if the TS does not have a stepper driver to provide the sequences then the motor will not step.

Hence the suggestions in post #6.

@Lonklin If you happen to opt for one of the popular L298 that comes already on a PC board, beware they are OK for DC brushed, but do not bring the current detection out , in order to use, for steppers, as offered by the basic IC specs.

 

Stepper motors are never driven directly from DC power supplies. A stepper motor requires that the different windings be alternately powered in a very specific four-step sequence. there is no way to drive them directly from a DC power supply.

Sorry I should have specified, your all confused. I am powering the stepper with a tb600 stepper driver i think, but I don't know what power supply I should use to power the driver that can be soldered, yet charged when out of battery.

 

Hence the suggestions in post #6.

@Lonklin If you happen to opt for one of the popular L298 that comes already on a PC board, beware they are OK for DC brushed, but do not bring the current detection out , in order to use, for steppers, as offered by the basic IC specs.

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so I have a driver, I just dont know a good power supply to use that gives off 20 dc v and can be soldered yet charged when necessary.

 

Certainly, knowing the specifications is mandatory to decide which driver is applicable. Consider that there are two quite different major classes of stepper motors, being four leads and six leads, that use quite different driving arrangements.

23hs8430 stepper motor with I think a tb600 driver.

 

Might help if you told us the name and specifications of the motors.

23hs8430 stepper motor with I think a tb600 driver

 

The motor is rated at 3a and the drive will be ample.
You just need the 20v supply that can provide 3amps+.
If you use around a 5a version it should be adequate.
(BTW post #3 should be 3amps not 3 volts)
Although many use them, I am not a fan of SMPS, although many use them because of cost.

 

The motor is rated at 3a and the drive will be ample.
You just need the 20v supply that can provide 3amps+.
If you use around a 5a version it should be adequate.
(BTW post #3 should be 3amps not 3 volts)
Although many use them, I am not a fan of SMPS, although many use them because of cost.

umm so how many volts would you say a battery of 5 amps would be and what would you suggest getting to suffice?

 

Define 'Battery' what is the technology?

 

At this point it becomes clear that we do not have an adequate understanding of the project, whatever it is.
In addition, the model number of the driver package tells me nothing unless I search for information about that model number, which will get me a thousand hits from sites that want to sell me one, even if they have no idea as to what it is.

 

I looked up the motor specs. and they show it as 3V, 1.8 Ohms, 3.5mH, so it should certainly step at lower than 20 Volts!