RCCrawler Forums

JohnRobHolmes · 09-24-2008, 03:30 PM

Ye Haw!! First try and it worked! I had to guess on which termination was which, since I couldn't follow the wiring fully on the motor. I even tried it on my novak Goat just to be sure. First try, what luck! Now to tell manufacturers what to make me, cause they didn't have a clue how to do it otherwise.

How small of a motor can we use? My first motor is a 3008 with a 3016 end bell for extra magnet length so the sensors can hang over and have something to read. The startup speed is still a bit faster than a brushed motor as the field voltage must be high enough to break the hold of the magnets. Slow speed is much better than sensorless though, there is no beep and start jerk crap. Vid once I get it tidy and mounted in a vehicle. Gonna take a few more days, already spent 2 hours on this today.

Rockshow · 09-24-2008, 04:00 PM

Very nice!

Culetto · 09-24-2008, 04:39 PM

Nice work!

Are the sensors going to be sturdy enough to run them on a MoA setup? In case i bang one on a rock. Sign me up!

maxoverclock · 09-24-2008, 05:11 PM

That is great. Are those the digikey sensors that you ordered? ...Do you mind if I give you a call after I get my parts in, what is the best time to reach you.......

thanks

max

Quote:

Originally Posted by JohnRobHolmes

Ye Haw!! First try and it worked! I had to guess on which termination was which, since I couldn't follow the wiring fully on the motor. I even tried it on my novak Goat just to be sure. First try, what luck! Now to tell manufacturers what to make me, cause they didn't have a clue how to do it otherwise.

How small of a motor can we use? My first motor is a 3008 with a 3016 end bell for extra magnet length so the sensors can hang over and have something to read. The startup speed is still a bit faster than a brushed motor as the field voltage must be high enough to break the hold of the magnets. Slow speed is much better than sensorless though, there is no beep and start jerk crap. Vid once I get it tidy and mounted in a vehicle. Gonna take a few more days, already spent 2 hours on this today.

coolkidjf7 · 09-24-2008, 05:20 PM

That is sweet! Keep us updated on the manufatures and such.

mauromj · 09-25-2008, 08:27 PM

That is so awsome. This is going to be revolutionary for crawler motors.

WheelChair · 09-26-2008, 07:56 PM

That Rocks man!

What's the chances of getting a couple sets of the sensors

WC

Flyin Hawaiian · 09-26-2008, 09:31 PM

Finally someone who knows what he's doing.
Great job now that what we need sensored outrunner.
Now the torque war is over. brushless baby

JohnRobHolmes · 09-26-2008, 11:32 PM

Still have more research to do. I am seeing if the design can be changed a bit. The magnets are so strong that there is still a bit of a jump at the start. What we need is weaker magnets, in a sense. Maybe wave wound stators. More details to come as I throw it into a rig.

What I want is a 6 ounce 3000kv outrunner with sensors.

HiloDB1 · 09-26-2008, 11:36 PM

What kind of esc are you using? Im guessing the novak goat esc? Im not aware of many sensored esc's for crawling.

JohnRobHolmes · 09-26-2008, 11:42 PM

The Tekin RS. Fully programmable, full drag brake, brushless, brushed, do all ESC with a sensor harness. Used a novak too but it isn't as programmable.

4xFord · 09-27-2008, 12:00 AM

Quote:

Originally Posted by JohnRobHolmes

What I want is a 6 ounce 3000kv outrunner with sensors.

MMMM... that sounds nice

SlickRockSpider · 10-20-2008, 10:35 AM

Hi John

Very Very cool project.

Can you draw a simple electrical schematic (???) showing the hall sensors and how they are connected to the ESC.

More pics would be great too.

Can I buy the Tekin RS ecs from you?

Evan

some_guy · 10-20-2008, 11:52 PM

how you going with this

i could really use this, got a 3800kv outrunner in a scaler, love to have low speed on that

JohnRobHolmes · 10-21-2008, 06:29 AM

I haven't had a chance to do more testing yet, but it is on the agenda. I am working with a factory to produce a hybrid, something with less magnetic pole attraction but very high torque.

If you look in the Roar Racing rules, the sensor pinout is in there.

Tzi · 10-22-2008, 08:48 AM

very interesting stuff JRH....subscribed

cartronicshn · 10-22-2008, 09:38 AM

John, would more sensors help in the jerkiness of the start up?

JohnRobHolmes · 10-22-2008, 12:04 PM

No it would not. The startup jerk is because the poles have high attraction to the magnets, it is a function of the slot/magnet ratio. It takes some force to get the motor spinning basically. I am working on a different design right now. It may end up being an inrunner, but a high pole count inrunner to have much higher torque at low speeds as compared to currently available sensored inrunners.

solomon7 · 10-27-2008, 12:56 PM

Quote:

Originally Posted by mysharona

If you pull this off, this will make me go brushless!

You've got my attention! subscribed

miniwheeler · 10-27-2008, 09:33 PM

How about a stator built with some twist in it instead of the poles lined up in straight lines

09-24-2008, 03:30 PM	#41
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	Ye Haw!! First try and it worked! I had to guess on which termination was which, since I couldn't follow the wiring fully on the motor. I even tried it on my novak Goat just to be sure. First try, what luck! Now to tell manufacturers what to make me, cause they didn't have a clue how to do it otherwise. How small of a motor can we use? My first motor is a 3008 with a 3016 end bell for extra magnet length so the sensors can hang over and have something to read. The startup speed is still a bit faster than a brushed motor as the field voltage must be high enough to break the hold of the magnets. Slow speed is much better than sensorless though, there is no beep and start jerk crap. Vid once I get it tidy and mounted in a vehicle. Gonna take a few more days, already spent 2 hours on this today. Attached Images

LinkBacks (?) 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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09-24-2008, 04:00 PM	#42
Rockshow Rock Crawler Join Date: Mar 2006 Location: North Carolina Posts: 502	Very nice!

09-24-2008, 04:39 PM	#43
Culetto RCC Addict Join Date: Jul 2008 Location: Sin City Posts: 1,332	Nice work! Are the sensors going to be sturdy enough to run them on a MoA setup? In case i bang one on a rock. Sign me up!

09-24-2008, 05:20 PM	#45
coolkidjf7 Quarry Creeper Join Date: Jul 2007 Location: 517 Posts: 341	That is sweet! Keep us updated on the manufatures and such.

09-25-2008, 08:27 PM	#46
mauromj Rock Stacker Join Date: Apr 2007 Location: Spokane Posts: 96	That is so awsome. This is going to be revolutionary for crawler motors.

09-26-2008, 07:56 PM	#47
WheelChair Winner of the '07 RCC dumbass award! Join Date: Nov 2006 Location: Up on a Mountain, out in the Woods Posts: 661	That Rocks man! What's the chances of getting a couple sets of the sensors WC

09-26-2008, 09:31 PM	#48
Flyin Hawaiian RCC Addict Join Date: Dec 2005 Location: Tucson Posts: 1,190	Finally someone who knows what he's doing. Great job now that what we need sensored outrunner. Now the torque war is over. brushless baby

09-26-2008, 11:32 PM	#49
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	Still have more research to do. I am seeing if the design can be changed a bit. The magnets are so strong that there is still a bit of a jump at the start. What we need is weaker magnets, in a sense. Maybe wave wound stators. More details to come as I throw it into a rig. What I want is a 6 ounce 3000kv outrunner with sensors.

09-26-2008, 11:36 PM	#50
HiloDB1 Quarry Creeper Join Date: Mar 2008 Location: Hilo Posts: 458	What kind of esc are you using? Im guessing the novak goat esc? Im not aware of many sensored esc's for crawling.

09-26-2008, 11:42 PM	#51
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	The Tekin RS. Fully programmable, full drag brake, brushless, brushed, do all ESC with a sensor harness. Used a novak too but it isn't as programmable.

10-20-2008, 10:35 AM	#53
SlickRockSpider Rock Crawler Join Date: Apr 2008 Location: Albany Posts: 640	Hi John Very Very cool project. Can you draw a simple electrical schematic (???) showing the hall sensors and how they are connected to the ESC. More pics would be great too. Can I buy the Tekin RS ecs from you? Evan

Sponsored Links

10-20-2008, 11:52 PM	#54
some_guy Quarry Creeper Join Date: May 2007 Location: melbourne, australia Posts: 274	how you going with this i could really use this, got a 3800kv outrunner in a scaler, love to have low speed on that

10-21-2008, 06:29 AM	#55
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	I haven't had a chance to do more testing yet, but it is on the agenda. I am working with a factory to produce a hybrid, something with less magnetic pole attraction but very high torque. If you look in the Roar Racing rules, the sensor pinout is in there.

10-22-2008, 08:48 AM	#56
Tzi Quarry Creeper Join Date: Mar 2006 Location: Australia Posts: 495	very interesting stuff JRH....subscribed

10-22-2008, 09:38 AM	#57
cartronicshn I wanna be Dave Join Date: May 2006 Location: HONDURAS...ROCK HEAVEN Posts: 5,076	John, would more sensors help in the jerkiness of the start up?

10-22-2008, 12:04 PM	#58
JohnRobHolmes owner, Holmes Hobbies LLC Join Date: Nov 2004 Location: Volt up! Gear down! Posts: 20,290	No it would not. The startup jerk is because the poles have high attraction to the magnets, it is a function of the slot/magnet ratio. It takes some force to get the motor spinning basically. I am working on a different design right now. It may end up being an inrunner, but a high pole count inrunner to have much higher torque at low speeds as compared to currently available sensored inrunners.

10-27-2008, 09:33 PM	#60
miniwheeler Rock Crawler Join Date: Nov 2005 Location: dallas Posts: 866	How about a stator built with some twist in it instead of the poles lined up in straight lines

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