Community
Wiki Posts
Search

Motor Torque vs kV

Thread Tools
 
Search this Thread
 
Old 01-10-2012 | 12:45 PM
  #1  
CloseYetFar's Avatar
Thread Starter
Tech Regular
 
Joined: Jun 2011
Posts: 317
From: South NJ
Default Motor Torque vs kV

Is it true that motors with lower kV have more torque then motors with higher kV? Usually higher amp draw produces more torque and higher kV motors tend to draw more amperage. So I would think a higher kV motor would also have more torque as well as RPM. The main down side being heat produced.

This would not take gearing into consideration as that would obviously change torque and RPM ratios. More of a motor shaft hooked up to a dyno scenario.

Can anyone clear this up? Thanks
CloseYetFar is offline  
Old 01-10-2012 | 07:58 PM
  #2  
Eric Bryant's Avatar
Tech Addict
iTrader: (46)
 
Joined: Oct 2007
Posts: 564
Default

There is a motor parameter called Kt that describes the relationship between torque and current. It is inversely proportional to Kv; as Kv goes up, Kt goes down.

If you put two motors on a dyno that had different Kv values and measured the current on each phase, you would indeed see that the motor with the higher Kv value requires more winding current to produce the same torque.
Eric Bryant is offline  
Old 01-10-2012 | 09:46 PM
  #3  
CloseYetFar's Avatar
Thread Starter
Tech Regular
 
Joined: Jun 2011
Posts: 317
From: South NJ
Default

Does this relationship apply the same way to both Brushless and Brushed motors?
CloseYetFar is offline  
Old 01-11-2012 | 03:56 AM
  #4  
Eric Bryant's Avatar
Tech Addict
iTrader: (46)
 
Joined: Oct 2007
Posts: 564
Default

Yes it does - this is something common to any motor with permanent magnets.
Eric Bryant is offline  

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



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.