R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 01-06-2006, 01:51 PM   #1
Tech Adept
 
Join Date: Dec 2005
Posts: 181
Default How low (temperature) can I go on a motor

Hi,

how low can I go on a motor temperature wise in order to get best performance?

P.S.: It is no problem for me to get temps as low as -250 or around there...
D_o_S is offline   Reply With Quote
Old 01-06-2006, 02:28 PM   #2
Tech Addict
 
Jam-ehz's Avatar
 
Join Date: May 2005
Location: Toronto, Canada
Posts: 592
Trader Rating: 6 (100%+)
Send a message via ICQ to Jam-ehz
Default

Well, I'd think you want it as cold as you can go before freezing any fluids in the motor, like the comm drops or oil..

Otherwise, you'll have a hard time starting it up with brushes stuck to the comm and oil frozen around the armature and bearings..
__________________
-=≡ Tamiya TA05 TRF415MSX F103R M-03R M-04 M-05 ≡=-
-=≡ CRC Carpet Knife 3.2 OFNA LD3 Pro Fastcats Spektrum ׀ווlı ≡=-
Jam-ehz is offline   Reply With Quote
Old 01-06-2006, 03:37 PM   #3
Tech Initiate
 
Join Date: Dec 2005
Location: Bangledesh India
Posts: 27
Default

-250 WOOOOOOOOW oil will freeze at about - 125 F so maybe -100 would be safe but try and test to make sure before you put it in your car and run it
Vahe is offline   Reply With Quote
Old 01-06-2006, 03:42 PM   #4
Tech Addict
 
josh69162's Avatar
 
Join Date: Jun 2004
Location: houston
Posts: 641
Trader Rating: 2 (100%+)
Send a message via AIM to josh69162
Default

I think a quick dip in liquid nitrogen would do just fine.
-Josh
josh69162 is offline   Reply With Quote
Old 01-06-2006, 04:02 PM   #5
Suspended
 
Join Date: Jul 2003
Posts: 5,108
Trader Rating: 14 (100%+)
Default

You're not doing this with my motors, so I don't care, but you should watch out for different contraction rates. You may have fragmented magnets after this.
Phatkat is offline   Reply With Quote
Old 01-06-2006, 04:10 PM   #6
Tech Regular
 
Join Date: Sep 2005
Posts: 454
Default

You will get condensation for sure and it will corrode some parts.
trf_racer is offline   Reply With Quote
Old 01-06-2006, 04:37 PM   #7
Suspended
 
Join Date: Jul 2003
Posts: 5,108
Trader Rating: 14 (100%+)
Default

Dare I ask how you're getting these temps??
Phatkat is offline   Reply With Quote
Old 01-07-2006, 03:36 AM   #8
Tech Adept
 
Join Date: Dec 2005
Posts: 181
Default

Quote:
Originally Posted by Phatkat
Dare I ask how you're getting these temps??
I have some (and can get) liquid Helium, so I would use that...

I'd make a custom container for it (like the LN2 tubes used in PC cooling)...

If you say around -100, I suppose I could use Dry Ice...

But what I'm most worried about is different contraction rates, oil freezing, and magnets becoming demagnetized...

I think that TEC cooling is probably the best option...(something like Much More's cooler)
D_o_S is offline   Reply With Quote
Old 01-07-2006, 04:21 AM   #9
Tech Regular
 
Join Date: Dec 2005
Location: CA
Posts: 458
Default

when i use my dyno, best performance is acheved when temps reach 30degC.
XingXing is offline   Reply With Quote
Old 01-07-2006, 06:47 AM   #10
Tech Rookie
 
Join Date: Apr 2005
Posts: 15
Default

i dont think you need to worry about de magnetizing your motor but different contraction rates and definately condensation will be an issue.
the_wrench is offline   Reply With Quote
Old 01-07-2006, 09:13 PM   #11
Tech Master
 
Team Duratrax's Avatar
 
Join Date: Aug 2004
Location: NSW, Albury/Wodonga
Posts: 1,674
Send a message via MSN to Team Duratrax
Default

Quote:
Originally Posted by D_o_S
P.S.: It is no problem for me to get temps as low as -250 or around there...
What sort of test is this? What are you trying to prove? Just curious.
Team Duratrax is offline   Reply With Quote
Old 01-08-2006, 05:58 AM   #12
Tech Adept
 
Join Date: Dec 2005
Posts: 181
Default

Quote:
Originally Posted by Team Duratrax
What sort of test is this? What are you trying to prove? Just curious.
I just want to know if there are any benefits from chilling a motor... and if there are, then why not do it?
D_o_S is offline   Reply With Quote
Old 01-08-2006, 06:48 AM   #13
Tech Elite
 
Join Date: Oct 2003
Location: Green Bay,WI
Posts: 3,006
Trader Rating: 1 (100%+)
Send a message via AIM to R/C Anonymous
Default

yes there are benefits in my opinion....a colder motor in the beginning of the race will only yield a cooler motor at the end of the run which will help eliminate performance fall off from higher temperatures

it is faster for the first few laps of the race then as it reaches back to room temperature becomes normal again but any cold electrical motor will yield better results then a HOT one(in my experiences)

even when i have done testing in car audio a cold alternator has higher voltage then one that has been running after awhile
__________________
Geoff C.
R/C Anonymous is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Motor Temperature? quick5pnt0 Electric On-Road 26 03-12-2016 10:08 AM
Temperature Gun Michael_T Australia For Sale/Trade 1 10-09-2007 06:11 PM
(PCR) Temperature Gun stimcon R/C Items: For Sale/Trade 5 09-13-2006 02:21 PM
motor temperature redlinezak Electric On-Road 2 03-24-2006 01:49 PM
Motor Temperature BigRon Electric On-Road 6 12-18-2003 11:43 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 11:21 AM.


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