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| [Solved] How to set RPM telemetry for a 24 pole motor? https://www.spirit-system.com/phpBB3/viewtopic.php?f=21&t=2397 |
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| Author: | curmudgeon [ Wed 24. Jan 2018 18:56:45 ] |
| Post subject: | [Solved] How to set RPM telemetry for a 24 pole motor? |
I installed a Spirit Pro on a SAB miniComet. I installed the HW 60A V4 ESC RPM wire to the Spirit PIT port. I am getting rpm telemetry in the Jeti radio, but the readings are incorrect since I do not have the correct "Sensing Divider" value in the Spirit. The motor is a direct drive, so I have the Spirit Gear Ratio set to "1". The motor has 24 poles, so the Spirit Sensing Divider value should be "12". However, the Spirit software only goes to "8". Considering that the Spirit software only goes to "8" but I need "12", is there a work around to this? Thank you. |
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| Author: | gabs_mex [ Wed 24. Jan 2018 20:08:43 ] |
| Post subject: | Re: How to set RPM telemetry for a 24 pole motor? |
Since is a direct drive an 1 - 12 poles, you can use as it was “gear 2:1” so set Gear to 2 and pole count to 6, mathematically is the same... don’t know if it will work... I’m building mine mini comet but haven’t finish it, that’s what I’m going to try.. let me know if it work... i also use Jeti. Hope it helps. |
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| Author: | curmudgeon [ Wed 24. Jan 2018 20:52:49 ] |
| Post subject: | Re: How to set RPM telemetry for a 24 pole motor? |
It worked!! I did just as you stated. I set the Spirit gov Sensing Divider to 6, the Spirit gov Gear Ratio to 2.00, and unchecked the Spirit gov box. Now at 85% throttle I am getting a reading of around 5,200rpm (that's with no blades). The miniComet manual states that the head speed at 85% throttle is 5,000rpm, so that 5,200rpm (with no blades) is in the ballpark. Thank you so much. |
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