Motor Voltage Constant Kv Tagged with: Hall of Fame, Kv, Motor, Motor Constant, Tips, Video, Voltage Constant Friday, June 29th, 2012 08:39 am GMT -7 Friday, June 29th, 2012 08:39 am GMT -7Friday, June 29th, 2012 08:39 am GMT -7 What is the motor voltage constant? Why is it important? Share this: Recommend on Facebook Share on Google+ Tweet about it Tell a friend Related posts: Measuring Motor Constants: Introduction Motor I0 and Rm Constants Measuring Motor Constants: Rm and Kv Method 2 Measuring Motor Constants: Voltage Constant (Kv) Figuring Out Unknown Motor Specs Simplified Motor and Propeller Selection Method Measuring Motor Constants: Winding Resistance (Rm) Measuring Motor Constants: Tools Puffed RC Battery Pack? Best and Worst Places To Be When Flying Epoxy Gluing Tips for Model Airplanes Tip: Is your Model Airplane Nose Heavy? Logging In... Add Comment Register Profile cancel Sign in with Twitter Sign in with Facebook or Name EmailNot published Website Comment Sure! Also send me the free email newsletter. 3 Replies 2 Comments 0 Tweets 1 Facebook 0 Pingbacks Last reply was Friday, June 29th, 2012 11:01 am GMT -7 Peter Hern View <abbr class='timeago' title='2012-06-30 04:00:06Z'>Friday, June 29th, 2012 10:00 pm GMT -7</abbr> Another explanation is as follows… The motor “kv” rating x the voltage = the synchronous speed of the motor. At this speed, the motor has no torque/power output. When a resistance is applied – i.e. fitting a propeller, the motor starts to “slip” (go slower) – the slip generates torque/power to turn the prop which converts the rotary motion to thrust that we need for our planes. The brushless motors we use are actually AC (Alternating Current) motors. In larger industrial AC motors the amount of slip is typically 3-4%. For the small, relatively inefficient motors we use, the skip is at about double – i.e. 6-8% Carlosreplied: View <abbr class='timeago' title='2012-06-30 04:05:39Z'>Friday, June 29th, 2012 10:05 pm GMT -7</abbr> That is an interesting alternative explanation. Thanks.