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Old Jan 15, 2013, 02:53 PM
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Old Jan 15, 2013, 03:12 PM
Have a nice day! Kristjan
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Slovenia, Novo mesto, Šentjernej
Joined Jan 2006
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Quote:
Originally Posted by juuuut View Post
Hi,

i would like to present my latest work

its a new ESC based on a MCU which has a HW PWM unit especially for driving three phasis BL motors.
because of that it can do high frequencys (6-128kHz), a clean active freewheeling(HW deadtime generator and complementary PWM) and the mcu dosent need to hadle the PWM .. so there is more time for other tasks

i got to say that the main idea to use this HW was from ampere dieter. he faund the MCU and also the gate driver and fets. and without his knowladge of ESC's and his work this thing wont exist!

the HW is based on small but powerful parts. on the 20A version 2.125mOhm N fets with fast gate drivers will be used. there will be also a 35A version with two of these fets parallel. the fets are rated with 100A and 140W peak each

the software will be closed source for now .. it is planed to make it open later.
(just to prevent misunderstandings.. yes the gui is based on the MWC GUI so it will and must be open source)

its features for now are:
- normal input PWM (50-500Hz)
- 1kHz fast input PWM
- MK I2C (also with I2C telemetrie)
- full 11bit (~2000 steps) resolution (input and output)
- jitter free PWM reading and generating (both done with HW timer)
- active freewheeling with a very short and stable deadtime
- Lipo protection
- stall detection
- closed loop
- GUI Configurable (also with live datas)
- USB port onboard (for a GUI and software updates)

the 35A version will also have CAN HW onboard (there is no SW for CAN atm.)

we have well working prototypes of the 20A version (these protos have 4mOhm fets on it so thay are rated with 15A but otherwise it will be the same thing )




here are also some videos of the GUI:

some active freewheeling tests:
http://www.youtube.com/watch?v=aH1MxxyNQ7Y

a resolution test:
http://www.youtube.com/watch?v=vxXoDRPHk-0

closed loop test:
http://www.youtube.com/watch?v=2A-RdbW7yLM

some HW tests (remember the protos are 15A .. and i dont want to kill it because i dont have enough )
http://www.youtube.com/watch?v=pQeG6FzwD5E
http://www.youtube.com/watch?v=27vduHSRp10


today warthox did the first acro flight tests

http://vimeo.com/56548217
http://vimeo.com/56557351

edit:

here is a video that shows its motor comatibility..
http://www.youtube.com/watch?v=UEZNpfO5oc4



the 20A version will be available at Fylduino soon .. it will cost 29,90€ incl. german tax (19%)

i will update this post when i have news.

a good new year at all


regards felix
Really nice work!


Is there any chance to make 4x20A or 4x12A ECS-s on one board? Something similar to new hobbywing 4x20A ESC.
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Old Jan 15, 2013, 04:09 PM
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Sure, that could be done. But if you burn 1 you can throw away all 4.
And ESCs and their wires cause heat and EMI which you concentrate in the center underneath the FC. Not a good idea...

ESCs are best mounted away from the FC/sensors. Since propwash cools them down, the arms are still a good compromise...


btw: Flyduino fixed the prices for the HEXFET series:
- 10A / 2-3s ~ 16 Euros
- 20A / 2-4s ~ 17 Euros
- 40A / 2-6s ~ 28 Euros
http://flyduino.net/ESC-brushless-motor-controller

Atm only the 10A version is available.
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Old Jan 15, 2013, 06:57 PM
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Old Jan 15, 2013, 10:43 PM
I DESIGN QUADCOPTERS
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With the x2208 motors what esc should I use
10amp are available not 20amp is this ok 10 amp
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Old Jan 16, 2013, 06:05 AM
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Originally Posted by saskya View Post
With the x2208 motors what esc should I use
10amp are available not 20amp is this ok 10 amp
Flyduino do say the 10A Hexfet ESC will handle more than the P/N 12A ESC.

http://flyduino.net/Flyduino-NFET-HE...onK-Firmware_1

Seeing 12A ESC seems the standard for 2208 (1100KV) one would think it should be OK????
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Old Jan 16, 2013, 07:23 AM
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and do I need to do something with software or they are ready to install an fly
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Old Jan 17, 2013, 12:02 AM
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Originally Posted by saskya View Post
and do I need to do something with software or they are ready to install an fly
The Flyduino ESC's I have are factory calibrated to a throttle range from 1000 - 2000 and I don't think it can be re calibrated. If you're using multiwii you set the right values in config.h. I know nothing about other boards though KK etc.

Maybe these since they're SimonK can be calibrated in the normal way if you need to. Might be something to check?
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Old Jan 17, 2013, 12:10 AM
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Quote:
Originally Posted by kinderkram View Post
Sure, that could be done. But if you burn 1 you can throw away all 4.
And ESCs and their wires cause heat and EMI which you concentrate in the center underneath the FC. Not a good idea...

ESCs are best mounted away from the FC/sensors. Since propwash cools them down, the arms are still a good compromise...
I'd really like to see a 4x 6A 2-3S ESC in a 35mm square footprint for mini quads
Or at least 2x ESC per board so two could be stacked vertically.


Would a 6050 gyro/acc chip or the CPU be affected by being close to an ESC? I have a Skywalker Quattro coming and I'd like to set them up close if possible. No other sensors and FETs facing away from FC. They won't be driven hard so they shouldn't get too hot.

ESCs have CPUs right on the same board and run fine????
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Old Jan 17, 2013, 12:23 AM
Have a nice day! Kristjan
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Slovenia, Novo mesto, Šentjernej
Joined Jan 2006
774 Posts
Quote:
Originally Posted by kinderkram View Post
Sure, that could be done. But if you burn 1 you can throw away all 4.
And ESCs and their wires cause heat and EMI which you concentrate in the center underneath the FC. Not a good idea...

ESCs are best mounted away from the FC/sensors. Since propwash cools them down, the arms are still a good compromise...


btw: Flyduino fixed the prices for the HEXFET series:
- 10A / 2-3s ~ 16 Euros
- 20A / 2-4s ~ 17 Euros
- 40A / 2-6s ~ 28 Euros
http://flyduino.net/ESC-brushless-motor-controller

Atm only the 10A version is available.
I had made few... multicopters and never burned ESC.

About price, 29€ is not so cheap. If there were 4 for let say 100€, that would be more reasonable ( talking about 20A ESC-s).
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Old Jan 17, 2013, 02:46 AM
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Quote:
Originally Posted by Soma View Post
I'd really like to see a 4x 6A 2-3S ESC in a 35mm square footprint for mini quads
Or at least 2x ESC per board so two could be stacked vertically.


Would a 6050 gyro/acc chip or the CPU be affected by being close to an ESC? I have a Skywalker Quattro coming and I'd like to set them up close if possible. No other sensors and FETs facing away from FC. They won't be driven hard so they shouldn't get too hot.

ESCs have CPUs right on the same board and run fine????
Hi,

MCU's or gyro's and ACC's have no problem with the ESC's... but a MAG and GPS does!

the high switching frequencies with also high current does a lot of EM noise..

i know there are many different opinions how a ESC schould be mounted on a multicopter. i think i know that the best place for it is near the motors. the reasons are:
- better cooling
- the lipo +- wires does a lot less EM noise then the 3 motor wires .. and you can add C's to it to smooth it.
- all the noise is as far as possible away from the RX and the FC

we also thought abaut a 4, 6 or 8 in one and maybe we do one later .. just because its mor easy to install.


regards

Felix
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Last edited by juuuut; Jan 17, 2013 at 03:22 AM.
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Old Jan 17, 2013, 03:14 AM
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Quote:
Originally Posted by juuuut View Post
Hi,

MCU's or gyro's and ACC's have no problem with the ESC's... but a MAG and GPS does!

the high switching frequencies with also high current does a lot of EM noise..

i know there are many different opinions how a ESC schould be mounted on a multicopter. i think i know that the best playce for it is near the motors. the reasons are:
- better cooling
- the lipo +- wires does a lot less EM noise then the 3 motor wires .. and you can add C's to it to smooth it.
- all the noise is as far as possible away from the RX and the FC

we also thought abaut a 4, 6 or 8 in one and maybe we do one later .. just because its mor easy to install.

regards

Felix
Thanks for the reply Felix

Always good to get info from one who knows.

Interesting about comparing EM noise from motor wires and power wires.

Cheers mate
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Old Jan 19, 2013, 12:23 PM
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I am puzzle about best props to use with this setup
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Old Jan 28, 2013, 04:33 PM
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juuut your work is very impressive! Looking forward seeing UltraESC on market soon...

btw. rarely I see things in theory work as planned and in your case it works in practice even better (thanks to warthox)
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Old Jan 31, 2013, 06:05 AM
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hi,

yes warthox is a grate tester if there are any problems .. he will find them!

while waiting for the 35A protos and the 20A to be in the shop, i tryed some other code

here are the first results of a sinusoidal driving code.. well just for slow movements like needed on BL gimbals
i started some prototypes of a 3S BLDC stepper controller, using almost the same HW.
the HW PWM also gives some adventages in this mode. i can use higher PWM frequencys (24kHz for now) so there is no audible sound, and because of its resoluntion i can use 1024 steps sinus tables without having too large dead periodes.


here are two videos of my first tests

UltraESC sinus betrieb für BLDC gimbals (0 min 50 sec)


and here a resolution test .. it does 10 steps per second in this video
UltraESC schrittmotor .. 1024 schritte pro 2 pole 10 schritte pro sekunde (3 min 56 sec)



regards

Felix
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