a) Calculate the armature resistance and flux constant of the motor 

b) Calculate the standstill torque and start-up current of this motor

When supplied by an armature voltage of 12 V and mechanically unloaded, a permanent magnet fan motor spins at speed of 3071 rpm and draws a current of 1.0 A. Then, with the same armature voltage of 12 V, the motor is gradually loaded and its speed and current are measured as reported in the following Table. Do not ignore rotational loss. n (rpm) 2903 2574 2242 1910 I. (A) 2.0 4.0 6.0 8.0