Directly start DC motor energy consumption braking circuit

The road is shown in Figure 3-195. When stopping, press the stop button SB2 contactor KMi to release, KM2 to close, and the motor
armature is connected to the braking resistor R: braking. Release SBz. Braking ends.
    Braking resistor R: can be selected according to the formula:
    Rz is: 1 Ra(o)
in the formula Em. ,——The back electromotive force of the motor at the beginning of braking, slightly lower than the rated voltage, V;
    J:. . . ——The maximum braking current, generally taken as I:. . . One (2～2.5),. ,A;
J. ——Motor rated current, A;
R. ——Motor armature resistance, n.