tag:blogger.com,1999:blog-910685024071367839.post6099372096897435490..comments2024-03-22T05:52:25.544-04:00Comments on BuildIts in Progress: CORE Outdoor Power PCB Motor TeardownBen Katzhttp://www.blogger.com/profile/15816221191617788028noreply@blogger.comBlogger14125tag:blogger.com,1999:blog-910685024071367839.post-13085315257140180532019-07-29T13:48:32.200-04:002019-07-29T13:48:32.200-04:00Core sold-out to a giant in the lawn care industry...Core sold-out to a giant in the lawn care industry who wanted to turn-key into the growing "environmentally-friendly" commercial landscaping market. We built that PCB (and many more like it) but take no credit for the design (we build-to-print).Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-88409629216958607202019-06-03T17:13:14.558-04:002019-06-03T17:13:14.558-04:00Ok, here is that picture of the path the electrici...Ok, here is that picture of the path the electricity takes through the conductor down to multiple layers.<br /><br />https://oi1174.photobucket.com/albums/r605/LordNelson7/CoreMotorElectricalPath_zpsr1lz76qj.png?t=1559509385<br /><br />The electricity starts in 53B(A+) and ends in 53A(A-). There are only 3 prongs in a real-world motor(there are 6 prongs in the diagram), so I am assuming the next phases prong is used as the end.<br /><br />Starting on PCB pattern 32(the layer on the left), which is the top layer, the electricity flows in A+, through the conductor(colored brown). The first part of the conductor is thick, then flows through a thinner wire-type area, then to the middle, a slightly thicker area, then to the thin again, then out the "lime green" colored circular area, down to PCB Pattern 33, the second layer, our of the "lime green" colored circular area, on to the light brown thick area, around to a thin layer, onto the middle, onto "bright red" color, then "dark blue" color, then "deep purple", then "dark green", then into "yellow" circle, back to PCB pattern 32, layer 1, at yellow circle, along thick "dark green", to thin, to middle, to "pink" circle, down to layer 2, to dark green, deep purple, dark blue, bright red, light brown, to blue circle, up to layer 1, along "dark yellow" back to A-.<br />Justin Nelsonhttps://www.blogger.com/profile/07518384927484298496noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-81199821188826279932019-06-03T16:54:42.853-04:002019-06-03T16:54:42.853-04:00Hi again! I have just a few questions if you don&#...Hi again! I have just a few questions if you don't mind, I am extremely interested in your results, but I don't really understand some of the variables(I am a software programmer, just getting into hardware, especially drones).<br /><br />Question 1: "There's a lot of dead space".<br />So from my limited autopsy of the motor, I believe there are 3 phases, so how many degrees are not used? I assumed, as with most 3 phase motors, there are 120 degrees that are used in a single phase, so the other 2/3 of the motor is unused. I also assumed that there are multiple layers, from looking at the patent, and that the phase goes all the way through the layers. I made a color diagram of the path of electricity through the coils in a phase. What did you mean by dead space exactly?<br /><br />"Back-EMF is pretty sinusoidal. An FFT reveals a little bit of 5th harmonic. Flux linkage is ~.0044, for a torque constant of .0264 N-m/A (peak phase amps). Line-to-line resistance is 125 mOhms. This gives a motor constant of .086 N-m/sqrt(watt)."<br /><br />1. "Back-EMF is pretty sinusoidal" What does that mean? Sorry, I'm new to hardware and motors, but I'm learning quickly!<br />2. FFT?<br />3. 5th harmonic?<br />4. So from your results(.0264 N-m/A), how many real world Newton Meters of torque could this motor produce?(Or am I interpreting that wrongly, perhaps that is dealing with something else)<br />5. ".086 N-m/sqrt(watt)" so .086 N-m/sqrt(500) = .086 N-m/22.36 = 0.0038 N-m? Oh I probably messed that one up.<br /><br />I appreciate it, just trying to understand, this is very exciting! Most in depth explanation ever!Justin Nelsonhttps://www.blogger.com/profile/07518384927484298496noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-69041494282027472262019-06-03T16:27:33.858-04:002019-06-03T16:27:33.858-04:00Oh yea! I thought so too, amazingly fabulously awe...Oh yea! I thought so too, amazingly fabulously awesomeest motors I've ever seen!Justin Nelsonhttps://www.blogger.com/profile/07518384927484298496noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-50027911834312692092019-06-03T16:20:18.656-04:002019-06-03T16:20:18.656-04:00Oh, and the design too, Axial Flux is an amazing n...Oh, and the design too, Axial Flux is an amazing next-gen design. Good for some things, WAY better than Radial Flux, even though RF has more start up torque. AF is WAY more efficient, you don't need the heavy iron core, the CORE design (mostly) eliminates Eddy Currents(so I've heard), or does it? I would LOVE to discuss this! You are the only person I've seen that analyzed the CORE motor this deeply.Justin Nelsonhttps://www.blogger.com/profile/07518384927484298496noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-71786195025053653262019-06-03T16:17:24.493-04:002019-06-03T16:17:24.493-04:00Oh and thank you for responding so quickly! I woul...Oh and thank you for responding so quickly! I would love to discuss with you the results! :) You are an amazing person!Justin Nelsonhttps://www.blogger.com/profile/07518384927484298496noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-89531441674285135272019-06-03T16:16:49.768-04:002019-06-03T16:16:49.768-04:00Its the RPM that it develops, the inertia(6800 rpm...Its the RPM that it develops, the inertia(6800 rpm) with a heavy rotor. It uses 500 watts and puts out over a horse. Only problem is not a whole lot of start up torque. The key is higher RPM.Justin Nelsonhttps://www.blogger.com/profile/07518384927484298496noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-69401087005232439642019-06-02T21:46:08.477-04:002019-06-02T21:46:08.477-04:00?
1000 watts output at 500 watts input violates...? <br /><br />1000 watts output at 500 watts input violates conservation of energy...<br /><br />A 1 kW RC car motor, for example, is much smaller and lighter.Ben Katzhttps://www.blogger.com/profile/15816221191617788028noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-51067006690698488822019-06-02T16:25:44.858-04:002019-06-02T16:25:44.858-04:00"Over all it's not a particularly high pe..."Over all it's not a particularly high performance motor for it's size or weight. There's a lot of dead space, and a very heavy, high-inertia rotor." <br /><br />I have tested this motor myself, and I strongly disagree with your results, although I found them very very interesting. The motor uses around 500 watts, and produces over a horsepower(around 1000 watts of power), 6800 RPM @ around 1 ft/lb of torque.<br /><br />There could be some room for improvement within the motor itself, however. Perhaps a re-design and optimization. I believe you may have come to your conclusion from examining the diagnostics, but the real-world performance blows other electric motor designs totally out of the water. I can do things with the(40v version, Elite) that I cannot do with a 2-stroke gas trimmer. Perhaps it is the higher RPM that this motor type develops, as you said it is a very heavy, high-inertia rotor.<br /><br />I believe there is tremendous potential for this motor design, given design improvements.Justin Nelsonhttps://www.blogger.com/profile/07518384927484298496noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-20163392858953055072019-04-14T16:53:33.092-04:002019-04-14T16:53:33.092-04:00So what's become of this company and their COR...So what's become of this company and their CORE electric motors? Troy-Bilt has a few CORE-tech outdoor power tools, but they seems to be discontinuing them, as you can't order them anymore. In fact I have their mower and weed-trimmer and they are fabulously awesome. I want more, though. Can't find anything about them, now. MarkRhttps://www.blogger.com/profile/12294142994657777229noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-23616145850698609212018-12-22T00:11:55.320-05:002018-12-22T00:11:55.320-05:00This comment has been removed by the author.Ben Katzhttps://www.blogger.com/profile/15816221191617788028noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-34886065548520109582018-12-21T23:09:27.442-05:002018-12-21T23:09:27.442-05:00Sorry I have tried many times to press the "s...Sorry I have tried many times to press the "send" button, but there is no response. I wonder if you have received my e-mail. My e-mail address is 940525739@qq.com, if you don't mind you can directly send to me. :)qikai lihttps://www.blogger.com/profile/10079301110979135374noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-54103364245591996112018-12-21T17:59:36.583-05:002018-12-21T17:59:36.583-05:00There's a contact form here:
http://build-its....There's a contact form here:<br />http://build-its.blogspot.com/p/about.htmlBen Katzhttps://www.blogger.com/profile/15816221191617788028noreply@blogger.comtag:blogger.com,1999:blog-910685024071367839.post-14621087954428860522018-12-21T07:30:45.797-05:002018-12-21T07:30:45.797-05:00Can I get your email? I have read your paper about...Can I get your email? I have read your paper about cheep actuator of cheetah. I want to ask you some questions. Hope you can answer. Thank you very much!qikai lihttps://www.blogger.com/profile/10079301110979135374noreply@blogger.com