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Thread: Sensored Outrunner motors- Revolver S

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Old 10-27-2008, 11:01 PM   #61
ntm
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Quote:
Originally Posted by JohnRobHolmes View Post
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.

The high pole count inrunners I've worked with are just as "notchy" as the outrunners of a similar diameter. Actually the outrunners might have been smoother.
Sounds like you need a smaller version of the kontronik "tango" series, they spin freely. They're very effecient with no ferrous losses.
Unfortunately they're only produced in 45mm diameters.

The roughness your experiencing wouldn't be caused by the rather large magnetic flux a 3 phase motor experiences on startup, would it ?
It should certainly be enough to skew your pickups signal, I would think.
Optical pickups would be ideal.

Just throwing some ideas out there, interesting stuff though, you could corner the market as far as crawler powerplants go, with a sensored outrunner. Nice work

Regards,
Nathan
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Old 10-28-2008, 08:10 AM   #62
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Quote:
Originally Posted by miniwheeler View Post
How about a stator built with some twist in it instead of the poles lined up in straight lines
This would fix the pole/ magnet attraction.


The slot to magnet ratio is the culprit of the notchy starts. There are three fixes. Skew the stator, change the construction (magnet/pole ratio), or make the motor slotless.
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Old 10-28-2008, 11:15 AM   #63
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Quote:
Originally Posted by ntm View Post
Sounds like you need a smaller version of the kontronik "tango" series, they spin freely. They're very effecient with no ferrous losses.
Unfortunately they're only produced in 45mm diameters.

I take it you have experience with a "tango". I looked on there web site and did not see "no ferrous losses". If you have more info PM me. I would like to know.



Evan
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Old 10-30-2008, 06:55 PM   #64
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So no need to "volt up, gear down" as much with a sensored outrunner then I guess... My KMS 980kv outrunner is doing great with 10 cells and ~35:1 in a 2.2.... Good enough to keep the cobalt 6ts in the electronics drawer. I guess I'm "special", in terms of liking outrunners more than cobalts heh
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Old 10-30-2008, 08:43 PM   #65
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Nope, I like my little 1050kV outrunner more than a 55T. I'm looking at a bigger one for the future
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Old 11-02-2008, 05:26 AM   #66
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Wanna hook up my Crawlmaster so I can use it again? lol
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Old 02-09-2009, 08:29 PM   #67
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Bump, what tha dilly yo?
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Old 02-10-2009, 06:42 AM   #68
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Still working on it, I have a few designs I am working with but nothing ready for mass production yet.
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Old 04-20-2009, 01:02 PM   #69
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Bump, any updated info yet ???
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Old 04-20-2009, 03:05 PM   #70
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Not yet, waiting on some prototypes. The initial design has been chosen however.
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Old 04-20-2009, 05:16 PM   #71
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I would go back to brushless if it works. I tried a crawlmaster sport 3014 1000kv but was unhappy about about the lack of lowspeed resolution and the cogging on startup.
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Old 04-20-2009, 05:17 PM   #72
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That is why I went back to brushed. Then I got tired of cutting comms so I started working on this motor
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Old 04-21-2009, 07:10 AM   #73
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Do you have any time frame as to when this might come out? I was thinking of running the 21.5 Losi sensored motor and ESC once my comp crawler gets here, but if I could get an outrunner instead that would be sweet. Just not sure though if it would give me enough wheel speed with those worm drives...
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Old 04-21-2009, 10:08 AM   #74
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It will be awhile. Probably another few weeks till I get the proto and then 6 weeks for the first run. The hard part will be finding an ESC at the same time at a good price. There are a few companies that make sensored ESCs, but so far all have some little bug or another.
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Old 06-06-2009, 06:09 AM   #75
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Hi JRH,

These things sound great. I'll definately be keen on getting me some of these when they come out.

Cheers,
Mike.
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Old 06-06-2009, 08:04 AM   #76
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I have it worked out that I will have combos for the system too. prototype still isn't done yet, but should be very soon.
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Old 06-07-2009, 10:54 PM   #77
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Is the prototype an inrunner or outrunner type brushless motor?
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Old 06-07-2009, 11:25 PM   #78
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outrunner. Inrunners are easy to find these days.
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Old 06-08-2009, 12:05 AM   #79
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Very very cool. this should be THE hot ticket for the Losi CC. Once you get this ironed out I want one bad..
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Old 06-08-2009, 10:31 AM   #80
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Sounds very good JRH! I am very interested in a small lightweight outrunner sensored motor!
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