Can't say I truly understand the brushless nomenclature (i.e. KVA) because nobody ever talks about the controller side. Brushless motors are basically steppers and without the controller are inert chunks of iron and copper. What I don't get is the KVA ratings (rpm's per volt) of these motors. In my mind, the controller dictates rpm by how fast it is energizing the phases, not by how much voltage is being applied. Voltage would affect acceleration and torque or am I getting this wrong?
ST On Tuesday, July 28, 2015 at 12:07:45 AM UTC-4, RocketMan 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.
