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Would an inverter welder be a suitable power supply for high amp stepper motors

  1. Nov 23, 2012 #1
    Good day people. I am new here and discovered the forum while trying to answer this question. I have a large variety of brushless and stepper motors collected all for the purpose of putting together my CNC mill. The router will be 80 amp 5500KV Kevlar bandaged brushless motor capable of 100,000 rpm. My problem is I am running out of money and still need substantial power requirements. My first max nc mill I doubled the volts and tripled the resistors to make it do a lot more work faster. All to my electrical engineers surprise. But I digress. The issue I raise here is would 220 volt inverter stepping down to 56 volt DC be suitable current for Brushless motors. There is a controller that converts the current to three phase for the motor. Any advise would be much appreciated
  2. jcsd
  3. Nov 24, 2012 #2
    Ar you saying the motor was bandaged with 5500KV Kevlar material- or did you mistype the actual motor's voltage?

    I am at a loss for what you are using an inverter at 220 if you need 56 VDC - can you post a schematic and perhaps more details about the motor?
  4. Nov 24, 2012 #3
    Thanx for reply. After re-reading I have mis worded. The steppers are not Kevlar bandaged but will handle 56 volts DC. the router motor is Kevlar bandaged so the winding's don't separate at 100,000 rpm. I do not have a schematic. I am interested in the principal type of current delivered from an inverter welder being compatible with brushless motors.Cheers
  5. Nov 24, 2012 #4
    OK - so 56 V and 80A - ~ 5KW Motor - at 100K RPM --- this is not a trivial case. A welder wants to weld - if you want to use the welder controls to regulate what is going on - I smell smoke.
    There are DC motor controllers that I would look to first - look for a DC Motor controller development board - they make good platforms for one offs - somthing like THIS

    It is not quite to the power level of your motor -
  6. Nov 24, 2012 #5
    I looked at the link. They are brushless controller boards. Similar in purpose to chopper drives plus cnc software. I still need power supply that has similar characteristics to DC battery. Cheers
  7. Nov 25, 2012 #6
    In general the DC bus power supply for this is not too big of a problem or difficult, however for the full power 5KW it can add up to a few $ - which then has me asking why were you wanting to use a welder to start with?

    Oh - just found this - worth a read.... http://ww1.microchip.com/downloads/en/devicedoc/41233a.pdf
    Last edited: Nov 25, 2012
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