The max power spec for the CIM motor is for normal operation. It is capable of drawing almost 1600w when stalled. Ohms law... 12v and 133A. However, generally speaking the CIM motor is very inefficient, ~65% or less.
An outrunner style brushless motor can produce the same torque at much higher efficiencies, ~75-90%. Copy link below for a motor that can easily produce more torque than the CIM and is almost definitely more efficient in normal operation. It just needs to have its 6mm shaft adapted. http://hobbyking.com/hobbyking/store/__18174__Turnigy_Aerodrive_SK3_5055_320kv_Brushless_Outrunner_Motor.html The higher RPM of a geared brushless system should minimize "cogging". Where the motor has trouble analyzing its own position. Which is a problem in direct drive low RPM circumstances. Mike > On Jul 27, 2015, at 9:07 PM, Doug Conn <dwconn...@comcast.net> wrote: > > Hello – > > We’ve had a few discussions regarding brushed vs brushless motors. The most > important point I remember was that brushed and brushless ran at similar > energy efficiencies under load. I’m wondering about efficiency with respect > to size and weight. > > Let’s compare this brushless motor > http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXLWY0&P=7 > > to this brushed motor > http://www.andymark.com/CIM-motor-FIRST-p/am-0255.htm > > Both are in the 300 watt range. At 12v, the unloaded brushless motor, rotates > at 32k rpm and the brushed motor at 5.3k rpm. Of course, the brushless motor > would need a lot more gearing to make it usable in a tank. That aside, could > I expect roughly the same performance from both motors ? It’s hard for to > believe that because the brushless motor is 1/14 of the brushed motor weight > and 1/7 of the volume. > > Is there another factor (besides cost) I need to take into account when > comparing a brushed to a brushless motor ? > > Thanks, > Doug > -- > -- > You are currently subscribed to the "R/C Tank Combat" group. > To post a message, send email to rctankcombat@googlegroups.com > To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com > Visit the group at http://groups.google.com/group/rctankcombat > > --- > You received this message because you are subscribed to the Google Groups > "R/C Tank Combat" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rctankcombat+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat+unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to rctankcombat+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
