Short-circuit braking circuit for reversible inching control of three-phase motors

As shown in the circuit in the figure, when STR is pressed, the reversing contactor KMR is closed, thereby opening the brake short contact (the normally closed contact of KMR), causing the motor to run in reverse; when STR is released, the contactor When the power is lost and released, the main contact KMR is opened, and at this time the brake short contact returns to the closed state, causing the M stator coil to generate braking torque for braking. In the same way, the operation method and principle of forward rotation braking are the same as mentioned above. This braking circuit is only suitable for small motors below 3kW.