DC motor energy consumption braking circuit

Shown is the DC motor energy consumption braking circuit. When braking, press the stop button SB2, the contactor KM1 loses power and is released, its moving
contact is connected, the voltage relay KV is electrically activated, and its moving contact is closed, causing the brake contactor KM2 to be electrically activated, and the brake contactor KM2 is electrically activated. The braking resistor R
is connected in parallel at both ends of the armature. At this time, because the direction of the excitation current has not changed, the torque generated by the motor is braking torque, causing the motor to stop quickly. When the armature
back electromotive force is lower than the voltage relay KV release voltage, KV is released, causing KM2 to lose power and release, and the braking process ends.