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  1. #1
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    Jul 2009
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    Dm4400m spindle motor?

    The dm4400m that I am retrofitting has a spindle motor that I’d like to salvage if possible.

    It appears to be a DC servo drive motor

    180vdc with 11nm stall torque per the label.

    It says it’s a model MT 40ZD4-45 motor

    Any suggestions on a drive to run this motor

  2. #2
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    Re: Dm4400m spindle motor?

    Hi,

    This is a PM DC motor.

    Sprint Electric have reasonably priced drives for this motor.

    https://www.sprint-electric.com/prod...unt-dc-drives/

  3. #3
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    Re: Dm4400m spindle motor?

    thanks for the Lead, do you know if they ship to the US?

    also which drive do you think would work with this motor?

    I am not that familiar with sizing a drive for a PM DC motor, so I could use some education?

    Thank you.

    Duke

  4. #4
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    Re: Dm4400m spindle motor?

    I think https://inverterdrive.com/ ships to the US.

    I got the exact same motor you have attached a picture of. I am running the sprint 3200i unit at 240VAC input. The 3200i drive does have tacho input that will work with the motor you have. The tacho feedback help keep the motor at a constant speed.

    The speed of PM motors is dependent on the voltage you supply to the motor. At 180VDC the motor will spin at a speed of 4000RPM.
    I have the 3200i-32A set to output 180VDC at max speed. For a DM4400 the 32A unit delivers is more power than the draw bar clamping force of the spindle can withstand (at least in my case). I would have to change the draw bar unit, or the whole spindle cartridge to allow for more clamping force to utilize the full potential of the drive.

    -Mathias

  5. #5
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    Re: Dm4400m spindle motor?

    One more note, have a look through the documentation of the drive to find the scale of min/max output voltage of the drive. Because if you are going to have the ability to rigid tap, the minimum speed of the sprint drive might not be slow enough for the application. I do not have rigid tapping set up on my machine, so this is not an issue for me.

    I would also suggest adding a temperature sensor (motor insulation class H 180C). I notice when running the motor at max rpm for a extended period of time the outside temperature of the motor gets really hot to the touch.

  6. #6
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    Quote Originally Posted by oscilloman View Post
    I think https://inverterdrive.com/ ships to the US.

    I got the exact same motor you have attached a picture of. I am running the sprint 3200i unit at 240VAC input. The 3200i drive does have tacho input that will work with the motor you have. The tacho feedback help keep the motor at a constant speed.

    The speed of PM motors is dependent on the voltage you supply to the motor. At 180VDC the motor will spin at a speed of 4000RPM.
    I have the 3200i-32A set to output 180VDC at max speed. For a DM4400 the 32A unit delivers is more power than the draw bar clamping force of the spindle can withstand (at least in my case). I would have to change the draw bar unit, or the whole spindle cartridge to allow for more clamping force to utilize the full potential of the drive.

    -Mathias

    Thank you, its always nice to hear from someone who is running the same motor with a specific drive.

    Did the documentation with the drive make it fairly straightforward to wire it up, or was there some educated guesswork involved?

    If you have any photos of your wiring that would be awesome, but if you have it all buttoned up, I wouldn’t ask you to open it up just for a photo.


    Obviously my machine isn’t running yet, but I replaced the spindle cartridge with a Taiwanese 90mm bt30 spindle so I’m hopeful that gives me enough clamping force.

    Thank you
    Duke

  7. #7
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    Re: Dm4400m spindle motor?

    Quote Originally Posted by oscilloman View Post
    I think https://inverterdrive.com/ ships to the US.

    I got the exact same motor you have attached a picture of. I am running the sprint 3200i unit at 240VAC input. The 3200i drive does have tacho input that will work with the motor you have. The tacho feedback help keep the motor at a constant speed.

    The speed of PM motors is dependent on the voltage you supply to the motor. At 180VDC the motor will spin at a speed of 4000RPM.
    I have the 3200i-32A set to output 180VDC at max speed. For a DM4400 the 32A unit delivers is more power than the draw bar clamping force of the spindle can withstand (at least in my case). I would have to change the draw bar unit, or the whole spindle cartridge to allow for more clamping force to utilize the full potential of the drive.

    -Mathias
    Got a quote today from Bardac drives which is apparently the company that interdrive sent me to in the States.

    for $700 for the drive and $180 for their fuse kit, I can't justify dumping that much money on a spindle motor thats probably about 30 years old and came to me with a cut cord.
    I can't even be certain this motor works and I have no intention of gambling almost $900 to find out.

    I am thinking I will be better off either fitting a 3 phase AC motor with a VFD since I don't plan to do any rigid tapping, or finding a more recent DC motor with drive already paired. probably would even be money ahead buying a more recent AC servo to run as the spindle.

    Thanks for the lead.

    Duke

  8. #8
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    Re: Dm4400m spindle motor?

    Quote Originally Posted by jduke View Post
    Got a quote today from Bardac drives which is apparently the company that interdrive sent me to in the States.

    for $700 for the drive and $180 for their fuse kit, I can't justify dumping that much money on a spindle motor thats probably about 30 years old and came to me with a cut cord.
    I can't even be certain this motor works and I have no intention of gambling almost $900 to find out.

    I am thinking I will be better off either fitting a 3 phase AC motor with a VFD since I don't plan to do any rigid tapping, or finding a more recent DC motor with drive already paired. probably would even be money ahead buying a more recent AC servo to run as the spindle.

    Thanks for the lead.

    Duke

    Hey Duke,

    I 100% agree with you on swapping the old motor for a new 3ph asynchronous motor instead of paying almost $1000 to only a new drive. I do not recall exactly what i paid for the 3200i, but I sure know it was way below 900$. Just FYI, a new 3ph asynchronous motor driven with a VFD will have lower torqe at slow RPM's compared with the original PM motor that was installed on your Dyna. I have been thinking of replacing my PM motor when the slipring brushes wear down. But I do not know how well a similarly sized asynchronous motor will behave compared to the PM motor I run today. Losing the ability to run a 80mm facemill with a Ap of 8-10mm would really slow down things on some of the machining that I do.

    Good luck, and keep us updated on the rebuild.

    Cheers,
    Mathias

  9. #9
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    Re: Dm4400m spindle motor?

    I found a 2hp 3ph motor locally for under $100 that was still in packaging from factory.

    I have it mounted, and once I get the VFD I have ordered, I’ll power up and see how it cuts.

    I know that I’m losing slow speed torque this way, but most of what I mess with is aluminum and in my home shop, I could probably make it work for steel with light cuts.

    Duke

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