Here are the specs for a hypothetical ideal brushed motor, whose performance is strictly linear between the free and stall points:
The specs at 12 volts are:
FreeSpeed = 400 radians/sec
FreeCurrent = 0 A
StallTorque = 0.4 Nm
StallCurrent = 20 A
Calculate Ke:
Ke = 12/400 = 0.03
Calculate Kt:
Kt = 0.4/20 = 0.02
Question:
Why are Ke and Kt not equal?