five(5) diy brushless ESC designs - Page 7 - RC Groups
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Jul 11, 2009, 07:44 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
Added to first post

Brushless controller for Control Line:
http://www.pek.nu/pekproj/proj/el/sc/
Discussion:
http://www.svensktmodellflyg.se/foru...entMainTopic=2
Last edited by Ron van Sommeren; Jul 11, 2009 at 07:55 PM.
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Oct 14, 2009, 11:14 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Added

OSMC projekt kits:
http://www.robotpower.com/
Discussion group:
www.yahoogroups.com/group/osmc
Jan 20, 2010, 01:13 PM
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Jun 15, 2010, 01:12 PM
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Aug 09, 2010, 11:30 AM
Registered User
hi guys I wanna to build 60A ESC for 1700KV brushless motor ..so i need the suitable single side PCB and circuit schematics ...thanks
Aug 09, 2010, 05:50 PM
Registered User
You will find you need a double sided board.

I am intrigued by you guys making ESC's. For just one, it has to cost 2 or 3 times the cost of just buying one. Getting the parts and pcb, soldering, testing,

learning why they blow up. Brushed ones are easy, brushless are hard.
Aug 10, 2010, 02:12 PM
Metallica
robe_uk's Avatar
Quote:
Originally Posted by jglenn
I am intrigued by you guys making ESC's. For just one, it has to cost 2 or 3 times the cost of just buying one. Getting the parts and pcb, soldering, testing,
sometimes the journey is more interesting than the destination.
Sep 08, 2011, 11:05 PM
Registered User
Hi. In the sensorless zone the 18 and 19 links are dead

micro motor controller
https://www.rcgroups.com/forums/showthread.php?t=261316
1.57gr brushless controller
http://home.foni.net/~c-schlabitz/Floh/
http://home.versanet.de/%7Eb-konze/blmc_flea/blmc.htm

At least i cant enter it...
Sep 09, 2011, 01:01 AM
Registered User
May I suggest you add this design referenced here?

https://www.rcgroups.com/forums/show....php?t=1417864

I've converted this into an 80V/200A design and I'll say their SW is very, very good and very well documented (source and schematic for sensored and sensorless). And you can control it in the other room as it has an ethernet controller built in . Or connect it to your car via CAN interface.

In any case, the kit's available from digikey. Get a scope and their free compiler and you'll be spinning motors in no time, tweaking source, etc.

PS. Most interesting about their source is how well protected it is against faults. If anyone has ever taken a CC controller and connected to a wheel of some kind, you'll see very quickly a $100 controller smoke and burn. And do it again to a second controller later that afternoon.

This design is very rugged. It has current sense on all 3 branches, and enough SW settings that you can really dial in what you want. Over current, under current, max current during acceleration, acceleration rate, dead time, etc. Dozens of parameters to tweak.

Extremely educational. I've augmented their SW and can know with certainty the phase currents, bus voltage and duty cycle via ethernet at 50 mS intervals. Too cool.

One interesting learning that goes back to the massive thread on peak versus average current...A 180A phase current happens while a wattsup meter will be reporting just 28A. I have buckets of cool waveforms.
Sep 09, 2011, 07:00 AM
Registered User
Quote:
Originally Posted by matttay
One interesting learning that goes back to the massive thread on peak versus average current...A 180A phase current happens while a wattsup meter will be reporting just 28A. I have buckets of cool waveforms.
Interesting, which thread is that? What was the PWM ratio and time on your 180/28 A test?
Sep 09, 2011, 12:44 PM
Registered User
It was this thread:

https://www.rcgroups.com/forums/showthread.php?t=551079

The peak versus average occurs when you are just starting up an electric bike (220 pounds AUW including rider in this case), for example. In the attached graph, there are the following curves: Green is the max phase currents (all 3 phases recorded) during PWM on. It's a bit noisy, but I've since cleaned up the ADC readings and verified by manually reading across 3 ohm sense resistor. It is indeed around 160A.

But the inline fluke (in this case) is reporting 29A.

However, look at the duty cycle, which is the middle ramp trace. This is duty cycle ranging from about 25% to 40%. The very bottom ramp is RPM. And the blue is bus voltage.

Now, the phase current reported is the MAX during the on time. So it's a bit pessimistic compared to RMS.

But this is another indicator that inline meters at partial throttle are miles away from what is actually happening. In this particular case, I'm learning that a 100A startup current when duty cycle is low can mean 1000A peak inductor current for 10's of uS if you are trying to start quickly.
Aug 26, 2012, 11:47 AM
Registered User
...
Last edited by h_e_c; Aug 26, 2012 at 11:56 AM. Reason: Deleted
Feb 12, 2014, 04:00 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Quote:
Open Source Firmware for ATmega-based Brushless ESCs. This tree contains Atmel AVR assembly code for ATmega-based 3-phase sensor-less motor electronic speed control (ESC) boards ...
github.com/sim-/tgy
in combination with this active development thread
www.rcgroups.com/forums/showthread.php?t=1513678

Quote:
Features
  • 16MHz operation on most boards
  • 16-bit output PWM with full clock rate resolution (~18kHz PWM with a POWER_RANGE of 800 steps)
  • 24-bit timing and PWM pulse tracking at full clock rate resolution
  • ICP-based pulse time recording (on supported hardware) for zero PWM input control jitter
  • Immediate PWM input to PWM output for best possible multicopter response (but NOT where soft start or really any significant current limiting is needed!)
  • Accepts any PWM update rate (minimum ~5microseconds PWM low time)
  • Optimized interrupt code (very low minimum PWM and reduced full throttle bump)
  • Configurable board pin assignments by include file
  • Smooth starting in most cases
  • Forward and reverse commutation supported, including RC-car style reverse-neutral-forward PWM ranges, with optional braking
Vriendelijke groet Ron
www.rmvc-cumulus.nl
Last edited by Ron van Sommeren; Feb 13, 2014 at 10:48 AM.
Feb 12, 2014, 12:52 PM
Registered User
Looks impressive. Apologies if it is stupid question - but what about governor (mode)?

For little (and bigger) helicopters that's one of the most desirable function.


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