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  1. snaggletto

    skogsgurra, or others more help with a DC drive

    Thanks for the replies. Like I mentioned before, I already have a VFD/AC motor replacement. However, the DC motor is large and was originally spec'd for the job. I'd hoped to find an affordable drive replacement, but it appears that I'm looking in the $2000+ range for the type of drive I...
  2. snaggletto

    skogsgurra, or others more help with a DC drive

    I'm in the US, Pensacola, Florida. I did some more searching on the 'net and found some digital and analog DC drives for ~400V armature. To my disbelief they were all in the $2000+ range. I already bought a 5HP VFD and 3HP 'inverter duty' motor for around $600. However, I wanted to give...
  3. snaggletto

    skogsgurra, or others more help with a DC drive

    Hey, Thanks for the reply. When we first got the machine, we tried fixing it. It does have a large 5kva transformer mounted on the side of the machine. We wired the transformer with 220 3ph. on the primary and I *think* the secondary that the machine used was 380. The control worked...
  4. snaggletto

    skogsgurra, or others more help with a DC drive

    Hello, I would like to get some more information on a drive for this motor; http://members.cox.net/snaggletto/Siemensdcmotor Skogsgurra was very nice to answer my question before; http://www.eng-tips.com/viewthread.cfm?qid=100427 however, this is more of a budget minded setup. The...
  5. snaggletto

    Finding LRC from NEMA MG 1 "Code Letter"

    Hello, Maybe I'm wrong, but that 'H' is the insulation class is it not? I would think the full load amps (FLA) rating would be quite close, if not exactly what you need. I have no idea what your motor is, but I looked at 3 misc. 10HP 460V motors and the FLA's range from 12.3 to 13.8A at 460V.
  6. snaggletto

    60Hz AC motor at 120Hz?

    Hello, Yes, below base RPM is called constant torque. This is dependant on the motor, I've found, and can literally be from 0-base RPM with the right motor and drive. Above base RPM is called constant HP, usually up to 2x rated RPM, the torque does drop off quickly. However, in my...
  7. snaggletto

    Nema 34 stepper motors?

    Hey, Can I ask what you are using as a pulse source and as a stepper drive? Check out; http://www.geckodrive.com/ The G201 is a 10x micro stepping drive, the G210 is also, but adjustable for full step, half step, micro step etc... They will drive a bipolar stepper up to 80V and 7A/phase...
  8. snaggletto

    Nema 34 stepper motors?

    Hello, Check out this site; http://www.seanet.com/~dmauch/ and check out the "What's New" and "Products" link. This guy commonly stocks NEMA34 steppers with toruqe range well above what your requirements are. Assuming 200 steps/rev, 5000 steps/sec is 25revs/sec X 60 = 1500 RPM...
  9. snaggletto

    What drive for this DC motor?

    Wow! I'm impressed with knowledge at this site, and the speed of which I get responces. I know very little about DC drives. The bit of looking I've done seems to turn up regenerative and non-regenerative types of drives. Also, there are drives that use SCR's and those that use PWM to...
  10. snaggletto

    What drive for this DC motor?

    Hello, I'm interested in pricing a drive for a variable speed DC motor. The nameplate information is here; http://members.cox.net/snaggletto/EMC%20Plate%20Right.jpg I can't make much sense of it in terms of max RPM, armaure voltage, field voltage etc... The motor used a 1.25:1 gear...
  11. snaggletto

    60Hz AC motor at 120Hz?

    Hello, Thank you for your reply. I've been all over asking this question. I'm kinda new to this stuff, so let me just run this by you. For comparison sake, how would a 2 pole 3600 RPM (keeping the frequency at 60Hz) standard motor compare to the 4 pole overspeeded motor above in...
  12. snaggletto

    60Hz AC motor at 120Hz?

    Hello, Did you look at the 'inverter duty' motor I linked to in my first post? On the specs sheet, in a graph towards the bottom, it shows the max constant HP RPM of 3540RPM and max 'safe' speed at some 5400RPM. Am I totally ignorant in thinking that this specific motor would safely run at...
  13. snaggletto

    60Hz AC motor at 120Hz?

    Hello, I've got a small CNC metal lathe that needs a new spindle motor. The application requires basically a 1:1 belt driven ratio to the spindle giving stepless programmable RPM's from nearly 0 - 4000RPM. I need as much torque as possible at lower speeds, less torque at high speeds is...

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