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#13
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Quote:
Current (I) = Voltage(V)/Resistance(R) using this formual, we can get the following: I = (Vbattery - Kv*Ang)/(Rbattery + Rmotor) where: I = current Vbattery = battery voltage Kv = motor's velocity constant - (rad/s)/V Ang= motor's angular-velocity (rad/s) Rbattery = battery's internal resistance + wiring or speed controller resistance Rmotor = motor's armature resistance from this, we can see that since the battery voltage will be 12V, once the RPM reaches a certain speed the top part of the equation, the (Vbattery - Kv*Ang) will be negative. This will make the current negative. the sign of the current tells which way the current is flowing. If the current is negative it means the motor is generating more voltage than the battery, which causes the current flow to reverse direction and the battery will start to be charged, instead of drained. Thats the only way i understand it, the EMF stuff was jibberish to me too ![]() Tom |
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