I've done a simple experiment to determine the motor resistance and back emf. The motor is connected in series with a shunt resistor to a variable voltage supply. From my knowledge, the motor voltage / motor current at stall is the motor resistor. However, when i stall the motor, the reading of motor resistor suddenly dropped drastically (2.00V no load -0.53V stalled). I know that the motor current should increase quite a lot but motor voltage should only increase by a little consider the shunt resistor is only 0.5ohm. I couldn't find any explanation of this else where.
Need help here!
Need help here!