View Single Post
Old 05-05-2014, 05:55 AM   #5
JetPlaneFlyer
Super Contributor
 
JetPlaneFlyer's Avatar
 
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 4,257
Thanked 471 Times in 439 Posts
Awards Showcase

5kW  Outstanding Contributor Award  1kW 
iTrader: (0)
Friends: (8)
Default

Originally Posted by RVDriver View Post
WHY?
I'm no electronics expert but a few advantages of brushless would be:
  • No friction losses of in commutator.
  • No sparking and wear of the brushes and armature contacts.
  • No limitations on current and/or voltage caused by the commutator.
  • With brushless the timing of the motor can vary depending on load and RPM (making it more efficient) brushed timing is fixed for all conditions.


There is one advantage of the brushed motor over the typical sensorless brushless motor on RC models, and that's that the brushless can produce full torque right from stationary. A sensorless brushless has to initially spin up slowly at low torque until timing is established. This generally isn't a huge issue for airplanes but it's a problem for cars. the better cars have sensored brushless motors which gets around the problem.
JetPlaneFlyer is offline  
  Reply With Quote
 
Page generated in 0.08620 seconds with 17 queries