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builds:ict [2017/09/25 16:27]
poleguy
builds:ict [2018/07/21 13:45] (current)
poleguy [Specifications]
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 ===== Specifications ===== ===== Specifications =====
  
-Motor: Alternators,​ broken, junkyard, $10 each\\+Motor: ​[[Alternators|Alternators]], broken, junkyard, $10 each\\
 ESC/ECU: Custom Phantom Power Racing Controller, running on a Xilinx Spartan 3e FPGA, $priceless\\ ESC/ECU: Custom Phantom Power Racing Controller, running on a Xilinx Spartan 3e FPGA, $priceless\\
 Battery A: 36V LiFe, shared with Phantom #48\\  Battery A: 36V LiFe, shared with Phantom #48\\ 
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 I adjusted the motor controller code to prevent nuisance tripping of the over-current protection. Basically I dropped the amount of current I was trying to draw, and bumped up the point at which I trip the over-current protection. I adjusted the motor controller code to prevent nuisance tripping of the over-current protection. Basically I dropped the amount of current I was trying to draw, and bumped up the point at which I trip the over-current protection.
  
-Maybe more important though is I adjusted the calculation of current from the sinusoidal waveforms. The angle used as the reference for driving the motors is now different in forward vs reverse and the current measurement offset is also different ​in forward and reverse. I'm not an expert on this, but it does seem important ​to avoid counting the magnetizing portion of the current ​as part of the actual motor current. ​[Hand wave.] +Maybe more important though is I adjusted the calculation of current from the sinusoidal waveforms. The angle used as the reference for driving the motors is now different in forward vs reverse and the current measurement offset is also in the opposite direction ​in forward and reverse. I'm not an expert on this, but it does seem important, as the current ​to voltage relationship ​of the wavefroms varies depending on which direction you are going and weather you are driving forward or in regen, but it seems the current ​you care about is only really at one angleAnybody care to explain this to me, I'm all ears.
- +
-[[http://​www.the-power-factor-site.com/​motorcurrent.html|]]+
  
 To make this happen I spent some time connecting the [[https://​en.wikipedia.org/​wiki/​ESP8266|ESP8266]] wifi module to replace USB serial port. That allowed wireless telemetry. I set up a WRT54G Linksys access point mounted in the car to relay the data to my phone, and then from there to a log file on the phone that can be sent to my email via the app. To make this happen I spent some time connecting the [[https://​en.wikipedia.org/​wiki/​ESP8266|ESP8266]] wifi module to replace USB serial port. That allowed wireless telemetry. I set up a WRT54G Linksys access point mounted in the car to relay the data to my phone, and then from there to a log file on the phone that can be sent to my email via the app.
builds/ict.1506374854.txt.gz · Last modified: 2017/09/25 16:27 by poleguy