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08-24-2012, 03:22 AM | #81 (permalink) | |
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08-24-2012, 03:56 AM | #82 (permalink) |
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I'd be interested seeing how the arcesc using Tony's logic board stacks up against this lot - or is AFW still a work in progress mate ?
Sent from my eyePhone using Tapatalk
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08-24-2012, 09:43 AM | #83 (permalink) |
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In his op he said he will discuss how to choose pwm and how it affects motors.
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08-26-2012, 11:25 AM | #84 (permalink) | ||
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In the meantime, I've added a HW review of the Castle ICE2 ESCs.. Last edited by Mercuriell; 08-26-2012 at 09:38 PM.. |
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08-26-2012, 09:40 PM | #85 (permalink) |
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Interesting stuff on the CC - really a lot of very neat features especially that splitting of the PWM - really cool ! Certainly goes a long way to explaining the CC Ice HV problems and how CC have remedied them - inspires me to give them another go as I really like the control board - logs, firmware update, ease of programming etc
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08-30-2012, 04:21 PM | #86 (permalink) |
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subscribed ! very interesting stuff !!!
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08-31-2012, 12:41 AM | #87 (permalink) |
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Simply fascinating!
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08-31-2012, 10:52 AM | #88 (permalink) | |
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09-01-2012, 12:46 PM | #89 (permalink) | |
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Steve Sent from Tapatalk using my Inspire 4g through ATT (meaning it's a wonder you can see this!)
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09-02-2012, 09:12 PM | #90 (permalink) |
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FWIW I worked for a company that was a very small startup ( 25 employees) and we actually designed a chip that we put into production. The initial test run of 10 chips was about $300,000, but after that the pricing per chip was very good. This was in 1991. Things have gotten a lot cheaper since then.
I'm not saying that Kontroniks did or didn't have a custom chip made, but just that it isn't as big a deal as it used to be.
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09-03-2012, 05:46 AM | #91 (permalink) |
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Ub3R, you've made one of the most interesting and well documented post on HF since a long time !
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09-03-2012, 01:44 PM | #92 (permalink) |
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I agree, ME LIKE!
This is what it's all about, sharing knowledge and having a great time doing it. I hope to contribute with my knowledge s well. Keep up the good work and keep them coming Greetings from Sweden! |
09-04-2012, 12:59 AM | #93 (permalink) | |
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Although I worked for a CNC manufacturer and we used multiple coldfire chips, but then again we needed a ton of processor power because we weren't just doing servo control. Steve Sent from Tapatalk using my Inspire 4g through ATT (meaning it's a wonder you can see this!)
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09-04-2012, 04:55 AM | #94 (permalink) |
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This is just about the best thread I've seen for a long time.
The explanation of Passive and Active FW was very clear but it made me wonder - in AFW it's clear that there are lower losses in the controller under partial load but where does the the energy stored in the winding inductance go if it's not dissipated in the FET body diodes? Presumably it's dissipated in the winding and does this make the motor itself run hotter (perhaps only marginally)? Would love to see a Hawk120 tested in this thread. I have three of them and they seem to run very cool under partial load - do they feature AFW does anyone know? |
09-04-2012, 05:20 AM | #95 (permalink) |
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It is my understanding that the energy is switched back to the supply, ie the battery by either diode or FET, of course the diode will drop approx 0.6v and generate heat. Also dont forget that three phases are overlapping here, so the next phase in the sequence will also be drawing current from the supply.
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09-04-2012, 05:42 AM | #96 (permalink) |
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CyprusFlyer
"It is my understanding that the energy is switched back to the supply" I don't believe that's the case. If you look at the circuit diagrams in Ub3r's explanation of FW, the FW current path appears to be back to ground via the body diode in Q2 or FET M2 in the case of AFW. As per his explanation, Q1/M1 will be switched off so there's no path for the back EMF to Udc. |
09-04-2012, 08:30 AM | #97 (permalink) | |
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While it's still flowing in the 'right' direction (ie, not dropped past zero - impossible with a diode; presumably stopped by the AFW MOSFET switching off), that torque is powering the motor (reversed current would be braking). So some of the saved power comes out of the shaft. Some will be the in the windings (as said in the bit of the posting I cropped.) [I guess...] |
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09-08-2012, 05:06 PM | #98 (permalink) |
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Results
Videos:
EPISODE 1: KOSMIK & 160HV Full Throttle Tests. Helifreak HIgh Res Download: Episode 1 Youtube: [ame]http://www.youtube.com/watch?v=z7jewAN1dTw&list=UU7lc_DFDwD3wDHd-ixH1gfA&index=2&feature=plcp[/ame] EPISODE 2: KOSMIK & 160HV Partial Throttle Tests. Helifreak HIgh Res Download: Episode 2 Youtube: [ame]http://www.youtube.com/watch?v=AKN18ZTqoag&feature=channel&list=UL[/ame] |
09-08-2012, 05:17 PM | #99 (permalink) |
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I'm glad you're liking the thread guys.
More reviews & vids to come.. BTW the free-wheeling power which is saved in AFW, flows back into the motor and generate a little more torque. Remember this is not much.. Only roughly 0.5 volts for only the PWM-OFF time. The longer the OFF time (or lower the throttle), the power that is saved. |
09-09-2012, 03:32 AM | #100 (permalink) |
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Awesome
Keep it up.
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