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Post by tronicgr on Aug 27, 2014 23:27:28 GMT
Hi,
Feel comfortable to create a thread with any questions you have about VFD inverters or other drives here.
Thanks
Thanos
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Post by nopilotyet on Oct 29, 2014 21:22:49 GMT
Hello,
I'm wrapping up testing on the BLDC (brushless DC) controller and motor. Just a (hopefully) quick review. motor is 28 pole (14 n-s magnet pairs). 550 in/Lb torque, 24vdc,200rpm,about 550 Watts. Got a whole pallet of these for $20/ea. Sold a couple to a University wind department for turbine blade development and recouped my investment. So there are 6 left. didn't have the heart to throw them out, sell, or scrap them for 12 years, so it must be fate! It turns out they only had 2 hall sensors in them for SIN/COS (trig stuff), so made a hall PCB with 3 @ 120 degrees. The motors had a very cool fiber ring with n-s magnets matching the rotor magnets. A CAD drawing (and 2 hours later) came up with spacing for the halls. put the board in and it worked the first time! Bout had a heart attack! The BLDC drive from china I tore apart to see what was in there upon arrival and found it to be of high quality with good (79 amp)IR MOSFETS and a serious controller chip all for $55. Had a little trouble with the 0-5v input hitting top speed at 2v, but again tore it apart and located the scaling pot and boom! worked perfect. Sorry for the lengthy post.
Eric
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paiva
New Member
Posts: 24
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Post by paiva on Mar 12, 2015 21:04:28 GMT
hello,
I have a question, which cable(awg) you use to connect the 6 vfd the power outlet?
thanks
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Post by tronicgr on Mar 13, 2015 18:17:28 GMT
hello, I have a question, which cable(awg) you use to connect the 6 vfd the power outlet? thanks Usually its 16 AWG for the motor wires and 14 AWG for single phase input of the VFD inverter. But you can use thicker wires if you like, just in case you will be drawing more amps than usual during rapid accelerations and decelerations of the motors. Thanks Thanos
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