R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric Off-Road

Reply
 
Thread Tools Search this Thread
Old 03-12-2008, 02:01 PM   #1
Tech Elite
 
d4man's Avatar
 
Join Date: Jul 2005
Posts: 3,634
Trader Rating: 5 (100%+)
Default Cogging with Brushless

I have heard this term tossed around in the Brushless world. What is cogging??
__________________
The greatest trick the devil pulled was convincing the world he didn't exist...
I always thought I had a pretty good imagination, but it turned out to be just my imagination.
------
NOT a member of Team Terribles!
d4man is offline   Reply With Quote
Old 03-12-2008, 02:04 PM   #2
Tech Master
 
GSPOT's Avatar
 
Join Date: Dec 2007
Location: Palm Bay, Florida
Posts: 1,993
Trader Rating: 62 (100%+)
Send a message via AIM to GSPOT
Default

when the car will stop and go, like a stutter upon accel

if its a unsensored motor this happens more often then it will on a sensored motor

also if a car is over geared this can happen
__________________
VTA member #126
GSPOT is offline   Reply With Quote
Old 03-12-2008, 02:12 PM   #3
Tech Elite
 
d4man's Avatar
 
Join Date: Jul 2005
Posts: 3,634
Trader Rating: 5 (100%+)
Default

Thanks!!!
__________________
The greatest trick the devil pulled was convincing the world he didn't exist...
I always thought I had a pretty good imagination, but it turned out to be just my imagination.
------
NOT a member of Team Terribles!
d4man is offline   Reply With Quote
Old 03-12-2008, 04:25 PM   #4
Suspended
 
Join Date: Dec 2007
Location: Owensboro, Ky
Posts: 783
Default

If you set the radio correctly there is no cogging.

Sensored-NO COGGING
Sensorless-Slight Cogging(except the tekin systems because the rotor
is sensored) The mamba systems are not for racing but people still use them.
Castle Creations were not shown at the last Expo, so they have no racing crew basically.

The mamba systems also cogg more often with nimh batteries, and the mamba's like to run really hot.
So having them extremly overgeared is ideal just on the mamba systems. Mamba's can get up to 250 degrees.
While others will burn up at 300 degrees, the mamba can go slightly past that.
Mamba is not the way to go if you race. They were really designed for bashing in the yard with.

If you go brushless I highly reccomend the novak or Tekin Systems. The Lrp ones are aliright also.
__________________
MODIFIED 4-WHEEL*the class of champions*
River City RC Racers/Rectors Raceway/Hoosier Hobbies
Hpi Rs4 Mt converted to 2wd Brushless.
Associated B44/Tamiya 501x WE
Off-road only!
bmaglinger is offline   Reply With Quote
Old 03-12-2008, 08:56 PM   #5
Tech Fanatic
 
Join Date: Feb 2006
Posts: 778
Trader Rating: 73 (100%+)
Default

Quote:
Originally Posted by bmaglinger View Post
If you set the radio correctly there is no cogging.

Sensored-NO COGGING
Sensorless-Slight Cogging(except the tekin systems because the rotor
is sensored) The mamba systems are not for racing but people still use them.
Castle Creations were not shown at the last Expo, so they have no racing crew basically.

The mamba systems also cogg more often with nimh batteries, and the mamba's like to run really hot.
So having them extremly overgeared is ideal just on the mamba systems. Mamba's can get up to 250 degrees.
While others will burn up at 300 degrees, the mamba can go slightly past that.
Mamba is not the way to go if you race. They were really designed for bashing in the yard with.

If you go brushless I highly reccomend the novak or Tekin Systems. The Lrp ones are aliright also.
You are so off-base, it isn't even funny.

Cogging has nothing to do with the radio, it's a function of the ESC not being able to find the rotor position of the motor easily. This is usually attributed to improper gearing or possibly poor quality batteries.

The Tekin motors are not sensored. They are sensorless motors.

Mamba Max systems DO NOT like to run hot, just like no other BL systems are happy running hot. By the time you hit 250F, you've demagnetized the rotor if it's the motor, or smoked some FET's if it's the ESC. 300F is beyond hot and your system is fried and on fire or melting car parts at this point.
skelly1344 is offline   Reply With Quote
Old 03-12-2008, 09:04 PM   #6
Suspended
 
Join Date: Dec 2007
Location: Owensboro, Ky
Posts: 783
Default

Quote:
Originally Posted by skelly1344 View Post
You are so off-base, it isn't even funny.

Cogging has nothing to do with the radio, it's a function of the ESC not being able to find the rotor position of the motor easily. This is usually attributed to improper gearing or possibly poor quality batteries.

The Tekin motors are not sensored. They are sensorless motors.

Mamba Max systems DO NOT like to run hot, just like no other BL systems are happy running hot. By the time you hit 250F, you've demagnetized the rotor if it's the motor, or smoked some FET's if it's the ESC. 300F is beyond hot and your system is fried and on fire or melting car parts at this point.
tEKIN THEMSELEVES TOLD ME THE ROTOR INSIDE IS SENSORED,
YES IT IS A SENSORLESS DESIGN BUT THE ROTOR IS SENSORED.
Yes the mamba prefers Lipo aka running hotter than nomal.
People have said elsewhere Nimh's have been blowing up due to using the mamba system.
That's why the mamba is not a racing brushless system. Yes they are Roar legal, but that's beside
the point and people will use a Lipo MaMba to have the extra edge they need to win the race.
A mamba Lipo can be killed with a Tekin Lipo......
__________________
MODIFIED 4-WHEEL*the class of champions*
River City RC Racers/Rectors Raceway/Hoosier Hobbies
Hpi Rs4 Mt converted to 2wd Brushless.
Associated B44/Tamiya 501x WE
Off-road only!
bmaglinger is offline   Reply With Quote
Old 03-12-2008, 09:09 PM   #7
Tech Adept
 
AEracer40's Avatar
 
Join Date: Sep 2007
Location: Hawthorne,NV
Posts: 181
Trader Rating: 2 (100%+)
Send a message via Yahoo to AEracer40
Default

That doesn't make sense. Maybe you misunderstood them.



As far as the Mamba systems.....They do NOT like to run hot. Mine actually runs quite cool. Any esc will run hot if the motor is overgeared, or is heavily loaded. Also, the Mamba is now very capable of racing and winning with the new firmware update.
AEracer40 is offline   Reply With Quote
Old 03-12-2008, 09:17 PM   #8
Tech Fanatic
 
Join Date: Feb 2006
Posts: 778
Trader Rating: 73 (100%+)
Default

Quote:
Originally Posted by bmaglinger View Post
tEKIN THEMSELEVES TOLD ME THE ROTOR INSIDE IS SENSORED,
YES IT IS A SENSORLESS DESIGN BUT THE ROTOR IS SENSORED.
I'm sorry you don't comprehend how these things work, but you can't have it both ways. The ESC either reads the back EMF of the motor to find the rotor position and commutate the motor windings, or the rotor has hall sensors installed to feed back rotor position to the ESC. Their current line of the R1 and R1Pro ESC's are not sensored ESC's and run the motor as a sensorless motor regardless of whether the rotor has sensors on it or not, period. If there is no feedback to the ESC via rotor mounted hall sensors, the entire system operates as sensorless system and the motor having sensors on it does nothing to alleviate any cogging issues, plain and simple. So your point of a Tekin having less cogging due to rotor mounted sensors is just completely untrue. If you still don't understand, I'll be happy to try and explain it to you, but I think you'd probably be happier using large all-caps text to yell your misguided information to me.
skelly1344 is offline   Reply With Quote
Old 03-12-2008, 09:17 PM   #9
Suspended
 
Join Date: Dec 2007
Location: Owensboro, Ky
Posts: 783
Default

You are right...but my above post just added to yours.
1+1=Complete

I just really got sick and tired of the Losi XXX-4 Mamba's killing me....
So I thought a 501x Tekin Brushless would stand a better chance
against them...so I can make A-mains instead of hitting the B-main
all the time...I'm not worried about winning the A just as long
as I at least make the A is all Im worried about at this time.
__________________
MODIFIED 4-WHEEL*the class of champions*
River City RC Racers/Rectors Raceway/Hoosier Hobbies
Hpi Rs4 Mt converted to 2wd Brushless.
Associated B44/Tamiya 501x WE
Off-road only!
bmaglinger is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
What is cogging? leigh18 Electric Off-Road 3 04-28-2008 04:32 PM
Brushless Modified Cogging/Drag Brake Effect per different brands... StickyFingaz Electric On-Road 8 04-10-2008 08:07 PM
Novak Brushless Cogging dougyunker Electric Off-Road 10 03-23-2008 09:47 PM
Bad Brushless Cogging? Litespeed Australian Racing 10 02-17-2007 04:11 AM
Cogging help? knucklebusta Electric Off-Road 5 12-17-2005 09:04 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 10:00 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net