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owner, Holmes Hobbies LLC ![]() Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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I have been playing with sensored outrunners a bit lately and happened to run across a guy who is building his own sensored DC motor controller, and he is also converting a large outrunner to sensor based commutation since it is easier than building a sensorless controller. I took apart a Tekin sensored motor today to find that it uses 120 degree separation of hall sensors. I also ordered some sensors from digikey http://search.digikey.com/scripts/Dk...me=480-1999-ND Hopefully I can fit the sensors between the teeth on the stator with no modifications. I don't know if I will use a Revolver Black motor or the Crawlmaster first. At any rate, this will be a good long term project. Here is the diagram that was made to determine where the sensors should go on the larger outrunner, he used 45 degree spacing. On my motor they will be spaced 120 degrees apart and placed between each phase, this will allow for universal endbell changes in the future. This is all new research for me, so I am going to hope for a bit of luck on this. I will use the Tekin RS speed control for first testing. If this pans out we could have sensored outrunners! Edit: Look for pre production pics, page 10! Last edited by JohnRobHolmes; 03-31-2012 at 02:29 PM. |
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Rock Crawler Join Date: Jun 2007 Location: Great Britain
Posts: 935
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Hmm most of that went right over my head but it sounds like and interesting idea. What would be the advantage of a sensored outrunner??
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I wanna be Dave Join Date: Apr 2004 Location: SoCal
Posts: 5,027
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![]() | #4 |
owner, Holmes Hobbies LLC ![]() Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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HUGE amounts of torque. Inrunners typically spin 50k or 60k max. Outrunners typically spin 10k. Same power for the same weight, but the outrunner produces the power at a higher torque value. I have two different sensors on the way now. One of em will fit right in the teeth of the crawlmaster. Score for part one! |
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Rock Crawler Join Date: May 2007 Location: lacey
Posts: 833
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If you pull this off, this will make me go brushless!
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MWRCA'er Join Date: Apr 2004 Location: Machesney Park IL
Posts: 3,995
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It all has to go within the can not designed around it, man that is going to be tight. Super cool idea though I love tinkering with electronics, I'll be watching this thread for sure.
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owner, Holmes Hobbies LLC ![]() Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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This is not my pic, but this is what I will attempt.
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![]() | #8 |
RCC Addict Join Date: Jan 2005 Location: Germany north
Posts: 1,669
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Plettenberg has used optical sensors should work with outrunners too |
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RCC Addict Join Date: Jan 2008 Location: www.rccrawler.com
Posts: 1,113
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I understand about %30 of what you are on about ...looks mega exciting hope you come up with the ultimate crawling motor ![]() whats different with having sensors????? best of luck !!!! |
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![]() | #10 |
owner, Holmes Hobbies LLC ![]() Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Sensors will allow lower startup speed for brushless motors.
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![]() | #11 |
RCC Addict Join Date: Mar 2007 Location: des moines
Posts: 1,104
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will this be like running a hall sensor in a car? if so what do you plan to do to help cut down on singal nosie ![]() |
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Newbie Join Date: Sep 2005 Location: frankfort
Posts: 14
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could i send yuo my bm 16 brushless and you do that to it for a fee? ![]() |
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![]() | #13 |
owner, Holmes Hobbies LLC ![]() Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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I wanna be Dave Join Date: May 2007 Location: Taylors Falls just hanging with the MNRCRC crew.
Posts: 7,843
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That smooth controlable sensored start up on a outrunner would put them back in the crawling game IMO.
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Newbie Join Date: Sep 2005 Location: frankfort
Posts: 14
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sweet, i will keep in touch with you about this.when do you think you might know when you could do it ![]() |
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![]() | #16 |
TEAM MODERATOR ![]() Join Date: May 2004 Location: Tennessee
Posts: 10,855
| ![]() Fixed it for you. ![]() Hey John,what do you think the sensors would do for my 3025? Adding sensors to a certain motor,wouldn't change the wheel speed and power levels at a given gear/voltage would it? Your not changing the winds or physical size of the arm. I can see how the sensors will make it allot smoother on start up. |
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![]() | #17 |
owner, Holmes Hobbies LLC ![]() Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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I don't know time frame, first I have to get the sensors in. I ordered them yesterday, why aren't they here yet??? Nothing will change about performance, except the slow speed startup. This should bring the average outrunner motor from 200 to 500rpm startup down to 10rpm or so, depending on magnet strength and consistency. |
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Newbie Join Date: Sep 2005 Location: frankfort
Posts: 14
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joh the pic you posted of the motor, where did you ge that? that is a bm 16 brushless,someone has already done it.so we know mine can be done ![]() |
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TEAM MODERATOR ![]() Join Date: May 2004 Location: Tennessee
Posts: 10,855
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If I send you my motor,could you add sensors and get it back to me before our comp tomorrow? ![]() ![]() | ||
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RCC Addict Join Date: Mar 2007 Location: des moines
Posts: 1,104
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so dose a smallr hall sensor make it pick up less rmps..i know the one im running in my car will only pick up 35rpms and up non the less i still got some brushlessmotor that will need to try this when you get it worked out
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![]() LinkBack to this Thread: http://www.rccrawler.com/forum/electronics/136315-sensored-outrunner-motors-revolver-s.html | ||||
Posted By | For | Type | Date | |
Outrunner for rock crawler - Kv and low-speed smoothness, is my theory sound? - RC Groups | This thread | Refback | 10-07-2011 12:03 AM |
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