"In the case of a stall (say where the prop hits the ground :-(), the ESC detects that the motor has stopped and handles it. In the case of my Turnigy Plush, it appears to try restarting but if the prop is jammed, it will eventually shut…"
Sunmi Akintewe's Discussions
Motor + ESC Stall Protection
Started this discussion. Last reply by Dave May 30, 2012. 1 Reply 0 Likes
Hi,I've decided on a Motor and ESC for my Quad ... However, I am worried about my Motor and ESC burning up in the event that the Motor stalls.Motor: …Continue
Can I get away without using an ESC? Electrical Engineers please help?
Started this discussion. Last reply by Jason Jarvis May 28, 2012. 14 Replies 0 Likes
Hi guys. I'm new to DIYDRONES!Building a Quad and had some hangups with regards to Brushless Motor control. I've never really used an ESC to control a Motor before. I've never built a Quad before…Continue
Sunmi Akintewe's Page
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Sunmi Akintewe posted a discussionMotor + ESC Stall Protection
Hi,I've decided on a Motor and ESC for my Quad ... However, I am worried about my Motor and ESC burning up in the event that the Motor stalls.Motor: http://clubheli.com/Tiger-Motors-MT-2814-10-770KV_p_3721.htmlESC: http://www.clubheli.com/Tiger-Motors-30A-ESC--2A5V-BEC_p_3588.htmlInternal Resistance of the Motor is 0.1 Ohms. I plan to run…See More
Sunmi Akintewe replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"So for 75% Throttle ... When each phase is supposed to be ON ... Does the ESC just cut down that ON time to 75% of its regular time via PWM?
I've included a diagram (just for Phase A for simplicity) to explain what I mean.
"
Sunmi Akintewe replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"Alrighty, that does make sense.
Now, I'm still a little confused on how the ESC 'controls' the Motor speed. I've done some reading and to help you better understand my question I made a sketch in Visio.
I would like to…"
Sunmi Akintewe replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"Wow, you guys explain better than the articles I've been searching. Thank you!
Lastly, how exactly is the Back EMF being measured? All 3 leads are used to 'Pulse' the phases of the Motor ... Wouldn't the ESC require…"
Sunmi Akintewe replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"Thanks! I think I'm getting closer to having a better understanding, I've read several articles on the internet but they just didn't click.
I know Back EMF varies with the load on the Motor; so for a constant load (e.g. Propeller) ...…"
Andrew Dunlop replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"Yes, although you won't hear speed controllers referred to as inverters. Although a BLDC motor will follow a 3-phase AC signal at low rpm (open loop), once a load is applied and/or the speed increases, maintaining synchronisation requires…"
Sunmi Akintewe replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"Oh I'm not looking to cheap out, I just thought I understood the concept and so I tried to get creative. I really wanted to understand what is all going on behind the scenes.
So pretty much the ESC is acting like an inverter then?"
Sunmi Akintewe replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"Thanks!
Upon closer examination of these Motors you are indeed correct. I completely missed the 3 'hot' connectors."
Jake Stew replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"ESCs are cheap, try ebay. It's the last thing I would worry about trying to cobble together.
There's a lot more to an ESC than your schematic. The PWM control signal is not the same as the one that's fed into the motor. You've…"
Andrew Dunlop replied to Sunmi Akintewe's discussion Can I get away without using an ESC? Electrical Engineers please help?"If only it was that simple. Unfortunately your circuit will not be able to drive a brushless motor. The term "brushless DC motor" is a bit of a misnomer - these devices are in fact synchronous 3-phase AC motors with permanent…"
Sunmi Akintewe posted a discussionCan I get away without using an ESC? Electrical Engineers please help?
Hi guys. I'm new to DIYDRONES!Building a Quad and had some hangups with regards to Brushless Motor control. I've never really used an ESC to control a Motor before. I've never built a Quad before either, so forgive me if this sounds stupid.I have included a design that I thought might work to control the Motors myself. It…See More
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