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IndustryArena Forum > CNC Electronics > Spindles / VFD > Chinese 2.2kw spindle burned out?
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  1. #13
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    Re: Chinese 2.2kw spindle burned out?

    Really you should keep these thoughts to your self, as I can show you a photo of a burnt up spindle caused by back EMF and Rotor Voltage, EMI can have the same affect but normally wipes out electronics as you say

    I am waiting for proof. BTW the OP said he had an open winding, not burnt out motor. Its EMI, not back EMF we are discussing?
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  2. #14

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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by wmgeorge View Post
    Really you should keep these thoughts to your self, as I can show you a photo of a burnt up spindle caused by back EMF and Rotor Voltage, EMI can have the same affect but normally wipes out electronics as you say

    I am waiting for proof.
    It does not have to burn up like the photo, to get an open winding, a winding can poof just like a fuse

    I posted a photo of the proof, this is what happens when back EMF is in affect, a stalled spindle you get a very large back EMF affect, if these systems had a Braking Resistor it would absorb most of the back EMF and save the spindle and VFD, how many do you need there is usually at least ( 1 ) a week this happens too

    When you see an over voltage fault you know that Back EMF has caused this, this only shows up on quality VFD Drives as a Fault most cheap drive don't have a DC bus voltage sensing circuit so can't protect the drive or spindle when this happens
    Mactec54

  3. #15

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    Re: Chinese 2.2kw spindle burned out?

    Wow, you guys still at it

  4. #16
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    Re: Chinese 2.2kw spindle burned out?

    He is confusing EMI with EMF and claiming unshielded wires to the spindle caused this motor to burn out!!!
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  5. #17
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    Re: Chinese 2.2kw spindle burned out?

    The motor was pretty hot when running but the aluminum blocks acted as a good heat sink. Warm to the touch. My wiring was hastily done, unshielded and wasn't sure on the proper guage, however the terminals on the drive are pretty small anyway. I usually run things for a while and go back to fix it properly once I've identified other bugs... I don't give a damn about code in this situation.

    I think I'm screwed because that's what I sent to the manufacturer for warranty purposes.

    What options might be next

  6. #18
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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by justCNCit View Post
    The motor was pretty hot when running but the aluminum blocks acted as a good heat sink. Warm to the touch. My wiring was hastily done, unshielded and wasn't sure on the proper guage, however the terminals on the drive are pretty small anyway. I usually run things for a while and go back to fix it properly once I've identified other bugs... I don't give a damn about code in this situation.

    I think I'm screwed because that's what I sent to the manufacturer for warranty purposes.

    What options might be next
    If you sent them a picture of that sorry, crappy wiring your screwed. But Mac is 100% correct you need to check the spec's of the spindle motor you buy
    and make sure your drive parameters are correct. He can help you on that, I can not. I do not install cheap Chinese VDF's.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  7. #19
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    Re: Chinese 2.2kw spindle burned out?

    I went thru all the settings and was pretty happy while it was running so now we go an adventure pull it apart like should have done to begin with, and not rely on foreign manufacturers.

  8. #20
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    Re: Chinese 2.2kw spindle burned out?

    Quote Originally Posted by justCNCit View Post
    I went thru all the settings and was pretty happy while it was running so now we go an adventure pull it apart like should have done to begin with, and not rely on foreign manufacturers.
    Post a picture of the windings.
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  9. #21
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    Re: Chinese 2.2kw spindle burned out?

    Not sure how to get inside as yet. Looks like there is no wire going to the ground pin on the terminal so far. I undid some hex bolts on the bottom not sure how it comes apart.

    Attachment 427066

    the hex bolts on the output end don't even clear the rotating parts.

  10. #22
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    Re: Chinese 2.2kw spindle burned out?

    Never is a wire to the Ground pin #4 Chinese seem to forget. I took the picture into an editing program and lighted it a lot, it looks black but no windings??
    Retired Master Electrician, HVAC/R Commercial. FLA Saturn 2 4x4 CNC Router

  11. #23
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    Re: Chinese 2.2kw spindle burned out?

    A little lost. The windings should be in the motor body correct? This picture is just the connector cap. I'm not sure how to get the motor housing apart. Best I can tell a special tool is needed on the chuck end.

  12. #24
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    Over current or voltage running at 12k rpm drawing 2 amps? I was taking a 1/8” depth of cut using a half inch carbide ball mill at 120 IPM. Would that really overload the spindle cedar wood

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