Recent content by mclovin

I'm a CAD administrator for an aviation company. I manage an install of 70+ seats of 3D design software and an engineering database. My education is in mechanical engineering but I've always felt that I'm a bit more of in industrial designer. My design experience is with automated donut...

Yo, I tested a Chinese BLDC and am starting to "run" the numbers. I measured: Kv=27.97 rpm/V Kt=.252 lb-ft/A Rmotor=.043ohms Noload: Io=1A, speed=1324rpm @ 48.6V (batt) So, here's where I need my head checked - if tis motor is stalled then the current at 48V through the .043ohm motor will be...

I've been trying to better understand KV for BLDCs by researching and taking measurements on my motors that I've spun up with a drill. In my research I've read one source that said the measured KV needs to be divided by .95 to correct for trapezoidal voltage wave forms used by BLDC controllers...

Hi All, I'm planning a <1000W mid-drive build from scratch. What I have right now is a concept and a basic design (more of a cartoon, really). Have a look: To date my plan is: BLDC from Golden Motor - rated at 500W. Specs show max power at 750+W (@48V). I'm not set on this motor. I'd like...

I think the main point for "Nepal Guy" is that he is getting the battery (ergo lead) back into usage as opposed to sitting on the side of a hill polluting the environment. If he could boost the quality and get his customers to pay for it that would be WAY cool. When I was in India years ago I...

I figured it out. Bad phase combo. I rewired and now the motor soins as expected. :D Cheers!

I was expecting 1.53A because that's what the MFG specified. I'm using an Infineon based controller (Lyen's moded version). I corraborated the CA data with a multi meter as well. They match exactly. My only thought at this point is that maybe there is some weirdness with the controller and...

I have a new ESC from Lyen, I wired it up and my motor worked on the first phase/hall sensor combo I tried. Yipee! However............. Under no-load conditions the motor spins twice as fast as I expected and draws 12A. Here's the low-down: BLDC (not sure if wye or delta) MFG says I should...

Here's a STEP file version. You'll need to unzip it. If you spot any errors let me know and I can edit the file.

If anyone is interested I can supply a 3D CAD model I made of the 171. I made it by measuring my Nuvinci. It's acurrate where it counts. There is a bit of guesstimation but not on anything that seems important i.e. flange outside dim, spoke circle pattern etc. If you are a 3D modeler you should...

OK. Sounds like I can use the batt- to ESC current measured on my CA. I'll go with that. Cheers.

As the title says - what's the technique for determining actual Io? I guessing an ammeter would help but maybe using a shunt would be better. Also, I'm wondering how the different phase currents are handled. I expect an ammeter would measure the RMS value of the current but I'm assuming I would...

Ya know, after I read the info i realized that i read all that before and somehow forgot...................it sucks getting old..... :roll: Thanks for the link.

I measure each phase circuit individually with a volt meter measuring AC voltage.

I have a BLDC (650W from Golden Motors) that I just spun up with a power drill. I measure the shaft RPM and the phase voltages. Now that I have this data I'm struck with the thought "how does measured Ke relate to Ke used in motor simulations"? My emperical data is: Phase 1 - 26.4 V/Krpm Pahse...