Like Tree25Likes

Drag brake

Reply

Old 05-09-2019, 08:45 AM
  #46  
Super Moderator
iTrader: (205)
 
Marcos.J's Avatar
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 29,897
Trader Rating: 205 (100%+)
Default

Originally Posted by glennhl View Post
How do you get max motor temp? Do you have to put a thermocouple on the motor and hook that up to the ESC?
no the hobbywing XR10 with the WiFi module gives you all of those readings
Marcos.J is offline  
Reply With Quote
Old 05-09-2019, 09:11 AM
  #47  
Tech Master
iTrader: (14)
 
Join Date: Sep 2013
Location: Arizona
Posts: 1,073
Trader Rating: 14 (100%+)
Default

Originally Posted by Marcos.J View Post

no the hobbywing XR10 with the WiFi module gives you all of those readings
But how would it know the motor temp? I'm not trying to be difficult, just very curious to see if that is an accurate reading. Unless the ESC has an optical pyrometer pointed at the motor, I just don't understand how it would know actual motor temps.
glennhl is offline  
Reply With Quote
Old 05-09-2019, 09:57 AM
  #48  
Tech Initiate
 
Join Date: Feb 2013
Posts: 32
Default

many motors contain a temp sensor as part of the timing sensor board. The sensor cable carries the signal back to the esc and if your esc has data logging you can see the motor temp. I know Tekin, Hobbywing and Motiv contain temp sensors but not sure about other brands. The temp signal is called out in the spec for sensor cables so it your motor is compliant and your esc has logging you will see the signal without any modifications.
Marcos.J and glennhl like this.
sweems is offline  
Reply With Quote
Old 05-09-2019, 10:06 AM
  #49  
Super Moderator
iTrader: (205)
 
Marcos.J's Avatar
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 29,897
Trader Rating: 205 (100%+)
Default

Originally Posted by glennhl View Post
But how would it know the motor temp? I'm not trying to be difficult, just very curious to see if that is an accurate reading. Unless the ESC has an optical pyrometer pointed at the motor, I just don't understand how it would know actual motor temps.
itís from the sensors that are already in the motor and esc . Just do not turn off the temp in the esc program and to will have a accurate reading the esc gives you the hottest temp of the run
glennhl likes this.
Marcos.J is offline  
Reply With Quote
Old 05-09-2019, 10:38 AM
  #50  
Tech Fanatic
iTrader: (20)
 
AngryRog's Avatar
 
Join Date: Jul 2008
Location: SoCal
Posts: 786
Trader Rating: 20 (100%+)
Default

Originally Posted by Marcos.J View Post

no the hobbywing XR10 with the WiFi module gives you all of those readings
That information can be accessed through the HW program box as well.
AngryRog is offline  
Reply With Quote
Old 05-09-2019, 10:47 AM
  #51  
Tech Master
iTrader: (14)
 
Join Date: Sep 2013
Location: Arizona
Posts: 1,073
Trader Rating: 14 (100%+)
Default

Originally Posted by Marcos.J View Post

itís from the sensors that are already in the motor and esc . Just do not turn off the temp in the esc program and to will have a accurate reading the esc gives you the hottest temp of the run
I learn so much from this forum. Thank you very much!
glennhl is offline  
Reply With Quote
Old 05-09-2019, 01:25 PM
  #52  
Tech Regular
iTrader: (4)
 
OttoKrosse's Avatar
 
Join Date: Jan 2014
Location: Mesa, AZ, USA
Posts: 493
Trader Rating: 4 (100%+)
Default

Originally Posted by gigaplex View Post
If you're using a lot of push brake, then drag brake isn't likely to affect temps much.

Bingo....we all hit the brakes the same number of times per lap, close to the exact same spot, we are not on 'brake' any longer than anyone manually braking. So, my question is: How would that create any more heat than manually braking?



OttoKrosse is offline  
Reply With Quote
Old 05-09-2019, 02:16 PM
  #53  
Tech Champion
iTrader: (1)
 
Join Date: Feb 2011
Posts: 6,862
Trader Rating: 1 (100%+)
Default

Originally Posted by OttoKrosse View Post
Bingo....we all hit the brakes the same number of times per lap, close to the exact same spot, we are not on 'brake' any longer than anyone manually braking. So, my question is: How would that create any more heat than manually braking?
There is still transit time(drag brake comes on) when going from throttle to brake and vice versa: drag brake can turn on&off over 20 times a lap, causing a little more motor heat and more esc computations(heat). You don't want current constantly fluctuating in your circuits: it generates too much heat, for not much work done.....
bertrandsv87 is offline  
Reply With Quote
Old 05-09-2019, 02:22 PM
  #54  
Tech Master
 
the rc guy's Avatar
 
Join Date: Aug 2016
Location: Detroit
Posts: 1,265
Default

I used a drag brake on my rc when I 1st changed over from brushed to brushless .But I no longer use any drag ..and to address the we all use the brakes the same amount.No we all dont thats why Im a fast guy and others are not. I use my brakes as few times as I can.
the rc guy is offline  
Reply With Quote
Old 05-09-2019, 04:06 PM
  #55  
Tech Elite
iTrader: (2)
 
gigaplex's Avatar
 
Join Date: Dec 2015
Location: Melbourne, VIC
Posts: 2,538
Trader Rating: 2 (100%+)
Default

Originally Posted by Lonestar View Post
You missed my point. <snip>
​Before, we had mod and stock. What do we have now? Mod, 10.5, 13.5. Then 17.5, 21.5, 25.5​​​​​​
No, you missed my point. Where Dan and I race, we have sportsman (21.5), stock (13.5) and mod. 21.5 is plenty fast enough and you don't need to spend a ton to remain competitive at the club level. It's also faster than the brushed stock classes it replaced.
gigaplex is offline  
Reply With Quote
Old 05-09-2019, 04:15 PM
  #56  
Tech Elite
iTrader: (2)
 
gigaplex's Avatar
 
Join Date: Dec 2015
Location: Melbourne, VIC
Posts: 2,538
Trader Rating: 2 (100%+)
Default

Originally Posted by bertrandsv87 View Post
There is still transit time(drag brake comes on) when going from throttle to brake and vice versa: drag brake can turn on&off over 20 times a lap, causing a little more motor heat and more esc computations(heat). You don't want current constantly fluctuating in your circuits: it generates too much heat, for not much work done.....
Clearly you don't know how brushless motors work if you don't think the current is already constantly fluctuating, even at a constant speed.
gigaplex is offline  
Reply With Quote
Old 05-09-2019, 04:17 PM
  #57  
Super Moderator
iTrader: (205)
 
Marcos.J's Avatar
 
Join Date: Sep 2003
Location: Semper Fi
Posts: 29,897
Trader Rating: 205 (100%+)
Default

Originally Posted by gigaplex View Post
Clearly you don't know how brushless motors work if you don't think the current is already constantly fluctuating, even at a constant speed.
clearly you don't know how burt races


lol
gigaplex likes this.
Marcos.J is offline  
Reply With Quote
Old 05-09-2019, 04:23 PM
  #58  
Tech Elite
iTrader: (2)
 
gigaplex's Avatar
 
Join Date: Dec 2015
Location: Melbourne, VIC
Posts: 2,538
Trader Rating: 2 (100%+)
Default

Originally Posted by Marcos.J View Post
clearly you don't know how burt races


lol
Oh I know, I've seen videos. Plus he never races these days as his Jeep never works.
Marcos.J likes this.
gigaplex is offline  
Reply With Quote
Old 05-09-2019, 06:02 PM
  #59  
Tech Champion
iTrader: (1)
 
Join Date: Feb 2011
Posts: 6,862
Trader Rating: 1 (100%+)
Default

Originally Posted by gigaplex View Post
Clearly you don't know how brushless motors work if you don't think the current is already constantly fluctuating, even at a constant speed.
Nobody said that the current was not already fluctuating...Drag brake makes the current fluctuate more than without drag brake, hence the increased heat, etc,....
Too much Kool Aid buddy and my Jeep 4.0L is working just fine, better than the Can Am series.....lol.....
bertrandsv87 is offline  
Reply With Quote
Old 05-09-2019, 06:20 PM
  #60  
Tech Elite
 
Zerodefect's Avatar
 
Join Date: Apr 2008
Location: Columbus, OH
Posts: 4,578
Default

I can never tell if he's serious of just fn with us?

20% of my brakes doing anything they want to, isn't going to heat up jack. Compared to 9 out of 11 seconds of full throttle per lap, on black carpet thicker than tall grass.

I always pre-cool my motors a few degrees before a run by spraying them with Tag body spray.
Zerodefect is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service