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  1. mikekilroy

    AC / DC motor

    Chinese 2 pole AC induction spindle motors go 18,000 and are not as bad as their total junk VFD drives. Price is hobby level. Google those words. You can get a couple kw 18000rpm motors for $ 300.00 More info on forums like cnczone, practicalmachinist. Then if you want good industrial...
  2. mikekilroy

    Tesla Motors

    There are many pros and cons to in-wheel motors. Obviously more cons than pros or it would be the way it is done. Companies I work with daily make in-motor size PMAC motors; it certainly sounds sexy but absolutely would not be my first choice with all the 'cons.' www.KilroyWasHere<dot>com
  3. mikekilroy

    Tesla Motors

    I received $ 95.00 in class action suit against small engine mfgr used in my John Deere lawn tractor: 26 HP in 1' cube space! Must have been that overhead cam design... Here is the spec on the Delphi EV PMAC motor I had in my equinox conversion. Check out the field weakening area 1600 -...
  4. mikekilroy

    Overloading a Servo Through the Trigger Pin?

    I should not have posted, sorry. I ASSUMED this was a typical +/-10v analog input command servo. Looking at their website, there are NO specs for input command; it seems to be a tiny model car controller! So all our comments about 24V PWM harming the command input are out the window with no...
  5. mikekilroy

    Overloading a Servo Through the Trigger Pin?

    Late to the party, but comment non the less... Zener means making the input non linear. Don't do it. Instead, use a voltage divider to reduce 24v peak to 10v peak: so do the math. Short the math, use a 15k in series with a 10k resistor, and feed the servo from the junction of them...
  6. mikekilroy

    Tesla Motors

    And remember with the "buried magnet" design they can run WAY into field weakening high speed; The common delco PMAC EV motor runs 3-4-5-10 times higher than base speed. www.KilroyWasHere<dot>com
  7. mikekilroy

    VFD Not Ramping to Full Set Speed

    Shepard, Jraef explained why your speed is lower than commanded. You explained that you see overloads. You explained you increase current limit somewhere from 40 to 60 amps and it helped. You said across the line it runs [because that allows extra overloading that the vfd prevents. All 4 of...
  8. mikekilroy

    VFD as static freq converter.

    HaHa! I deserved that for not going to your webssite to get email! Let us know if any of the 3 1ph electronic 60hz to 50hz conveter boxes I found online work for you. www.KilroyWasHere<dot>com
  9. mikekilroy

    VFD as static freq converter.

    itsmoked, I too doubt you could get a vfd to do this. I can't find your email; email me for another idea? www.KilroyWasHere<dot>com
  10. mikekilroy

    Softstarter for Synchronous Motor

    Probably not, since Synchronous motors by definition will not start across the line. You need a drive, not a soft start. www.KilroyWasHere<dot>com
  11. mikekilroy

    Anyone with experience in Kollmorgen DBL servomotor?

    The S600 drives were designed to be powered ONLY from a WYE power source; ie., the X0, center of the wye, aka nuetral to some, MUST be tied to PE. If you power this drive from any type of delta or non wye without X0 tied to PE, then it is not UL or CE certified; this is all shown very clearly...
  12. mikekilroy

    Forced Ventilation of 1000-5000W brushless servo motors

    itsmoked, I would only correct you if you stated something not quite true; since you & electricpete are spot on, no corrections forthcoming! HA! I assume the motors in question are AKM models, in which case, yes, they are totally sealed and IP65 minimum with IP67 a small fee option. Others...
  13. mikekilroy

    AC Dual Motor Sync, Ramp Up/Down, Dual Limits...

    Thank you Scotty. He did. After talking to him I told him I would summarize and pass on his info and need to a local Chicago area engineer I know who can help, as well as a PLC wizard here who travels. I did not want to just be the only one offering names of folks who might help him. As Jraef...
  14. mikekilroy

    AC Dual Motor Sync, Ramp Up/Down, Dual Limits...

    Very good. I mentioned posting contact info as I am not aware of any PM capability on this forum. www.KilroyWasHere<dot>com
  15. mikekilroy

    AC Dual Motor Sync, Ramp Up/Down, Dual Limits...

    "What are the drawbacks to servo motors? What is the difference between the motors we are using and the servo motors?" Only "drawback" to servo motor is more cost. But if the stuff you have now is not doing the required job, is a bit more cost a drawback? Your Bodine Dc GEAR motors with Dart...
  16. mikekilroy

    AC Dual Motor Sync, Ramp Up/Down, Dual Limits...

    As long as you have non-slip rotary to linear translation (ex: rack/pinion), then there is absolutely no need for any external position feedback devices like string pots. If your motion system allows slip (ex: steel wheels on concrete) then you will require position feedback at the end...
  17. mikekilroy

    AC Dual Motor Sync, Ramp Up/Down, Dual Limits...

    Antiskew control is hard more difficult at high speeds but not too bad to handle at slow speeds like you aeem to mention. On large machine tool gantries we often need to run upto 1200 IPM with motors 30-40-50' apart, and do controlled synchronized stop if the skew exceeds about .o20". So...
  18. mikekilroy

    Help with my linear resonance actuator, solenoid, piezoelectric motor, or ERM question

    This is perfect application for a PM linear servo motor. I would recommend you contact some mfgrs of them such as kollmorgen.com and others. We have done many similar performance 15-25hz oscillating motions as you describe. They will assign an application engineer to walk you through their...
  19. mikekilroy

    Motor winding resistance

    I was going to second eletricpete's comment, but figured he did not need any seconding with his expertise. Well, since it was brought up again, I can tell you I have experienced 3-4 cases of end turn shorts that let the motor continue to run in my 40+ yrs of fun in this field!! I once made...
  20. mikekilroy

    Problem when feeding a motor with high frequency source

    Gustavo, stop worrying about motor heat! It is simple: as long as you put nameplate current rating or less into your motor, you will not overheat it! Period. www.KilroyWasHere<dot>com

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