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Mar 13, 2019, 09:55 PM
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Build Log

The Strange American "Kyocera" DIY 4520 motor


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A core is approximately 50 dollars!
Last edited by 1boho; Mar 15, 2019 at 05:02 AM.
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Mar 13, 2019, 10:20 PM
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Turned the carrier round and made it a 1inch 4 bolt m4 bolt pattern for motor mounting. I put axial cooling holes in the bell. The next thin is a prop shaft. I think I will use one like an AXI has.
Mar 14, 2019, 10:23 PM
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" kyocera " Factory Wind.


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28 turns of 25 ga. for 9.072mm^2 CCS in a slot area of 28.354mm^2. Only 32% fill. I'm sure we can build upon that. The insulated tooth width is 4.15mm. The total tooth height from the bottom of the slot to the stator od is 7.50mm. The hammers width is 9.76mm and the thickness is 2.356mm. The slot opening is 1.52mm. It was a wye wind ABCABCABCABC each phase conductor was 5.6 meters. That resistance per phase should be somewhere in the ball park of 5.99 milliohms or (.0059) ohms .Captured the generated wave @ 2,250 rpm. 990 less rpm the intended OEM full no load speed of 3,240 rpm. Not much present outside the fundamental but the 5th 1.2 volts @ 700 hz but the general wave form shape would lead me to believe a good bit of ripple exist. Maybe I'm wrong . It would be nice to see what kind torque number it generates on a prop.

You see it has thick teeth and hammer shapes very close to kontronic.
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Last edited by 1boho; Mar 14, 2019 at 10:38 PM.
Mar 14, 2019, 11:07 PM
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6 turns of 1.8mm would be fairly easy and increases the fill already to 55.4% one more turn would give me 65%. fill. How much is possible and were hooking the two short coiled SPS motors in series

I'm tickled because the " Strange American" calculates 12 turns of 1.06mm in a slot >20mm^2 is only 34% fill. I think most people winding here do better than this.


I found something I think as odd. The motor is 4 poles I think, but let me pull out a handy tool. I need to know because the Nissen Cal gives a ABCABCABCABC a Kw of 0 with 4 poles.
Last edited by 1boho; Mar 15, 2019 at 02:21 AM.
Mar 16, 2019, 12:13 AM
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Turned the winding mandrel and the rear of the mount flush.
Last edited by 1boho; Mar 16, 2019 at 12:30 AM.
Mar 20, 2019, 10:40 PM
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Here is the salvaged flux ring with 8 poles. The bell was unattractive to me so I'll machine a new end bell that will allow me a removable shaft and better cooling. 12N8P is really a higher rpm topology. Maybe we build the mandrel for the press fit retention sleeve on this one.
Mar 21, 2019, 04:52 PM
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I wound a 67% increase from 30% fill in copper with 14 turns in the slot of 17 ga. Why is 30% so impressive? I'm doing this with 4 partial motors .... YY+DD series connected. With two more turns the increase in copper is 100 percent.
Last edited by 1boho; Yesterday at 01:50 PM.


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