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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > CNC kit purchased - I have electrical questions.
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  1. #1
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    Question CNC kit purchased - I have electrical questions.

    Newb here.

    I bought a package off of ebay that came with a 36V power supply, and stepper drivers rated from 18-50VDC

    The 425 oz/in Steppers have the following specs:

    Part No.: 57BYGH115-003B
    Frame Size: NEMA23
    Step Angle: 1.8 degree
    Voltage: 6.3VDC
    Current: 3 A/phase


    The voltage is listed at 6.3VDC - so I have questions....

    They came as part of a kit, so I assume they are meant to work together....

    What happens if you run steppers at a higher voltage than the nameplate voltage? Do they run hot? Burn Out? Release the magic smoke?

    What voltage would you recommend I use for these motors? Or should I replace them with higher rated ones?

    Thanks in advance.

  2. #2
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    Re: CNC kit purchased - I have electrical questions.

    Quote Originally Posted by t3kboi View Post
    Newb here.

    I bought a package off of ebay that came with a 36V power supply, and stepper drivers rated from 18-50VDC

    The 425 oz/in Steppers have the following specs:

    Part No.: 57BYGH115-003B
    Frame Size: NEMA23
    Step Angle: 1.8 degree
    Voltage: 6.3VDC
    Current: 3 A/phase


    The voltage is listed at 6.3VDC - so I have questions....

    They came as part of a kit, so I assume they are meant to work together....

    What happens if you run steppers at a higher voltage than the nameplate voltage? Do they run hot? Burn Out? Release the magic smoke?

    What voltage would you recommend I use for these motors? Or should I replace them with higher rated ones?

    Thanks in advance.

    Hi mate. Yes the set is matched and have no issues.
    I have a similar kit on my X2.
    The 36v is to power the drivers.
    The drivers then basically send whatever the motors ask for to them.

    As long as you stay within the driver specs it's fine, I've seen many that have upgraded to a 48v supply.

    One thing I did notice is a difference in motor inductance compared to the ones I have.
    WT57STH115-4204B

  3. #3
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    Re: CNC kit purchased - I have electrical questions.

    As general starting point to calculate the voltage would be 32 times the square root of the inductance of the motor per phase. I did a quick search and found a spec for the 57BYGH115-003B which showed 9mh so that would be 32*SQRT(9) = 96 volts. That is not a good match for 36 volts and the 96 volts far exceeds the 50 volt limit on the driver. I would find other motors. Look for ones with a low inductance. 2.5mh ones are pretty easy to find and work well with 48 volt power supplies which would work with the drivers you have.

    Here is one that is NEMA23 570oz/in 5A with 2.5mh per phase. These would we good with a 48 volt supply if your driver can handle 5 amps.
    https://www.automationtechnologiesin...3h2100-50-4bm/

  4. #4
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    Re: CNC kit purchased - I have electrical questions.

    Thanks for the input.

    I read through the driver manuals, and they are current drivers, limited to 4A per phase, configured to max out at 3A per phase, per the motor spec.

    Sent from my LG-LS777 using Tapatalk

  5. #5
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    Re: CNC kit purchased - I have electrical questions.

    Hi
    The motors should work fine. As stated the inductance is a bit high. This will reduce the top speed of the stepper motor. If you’re machine uses 5mm pitch ballscrews then stepper speed is probably not as issue.
    The motors may get a little warmer due to the higher inductance but again it shouldn’t be an issue.

    Personally I’d go ahead and use it now that you’ve purchased it.

    Cheers
    Peter.



    Sent from my iPhone using Tapatalk Pro
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  6. #6
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    Re: CNC kit purchased - I have electrical questions.

    What driver are you running? It too should have an input voltage assuming 36 volts, and an output voltage, with output current.

    Given it was sold as a kit it will probably work just fine.

    I agree because of the high impedance you'll generate some heat, and the holding force is higher.



    Sent from my SM-G892A using Tapatalk

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