Single tube rectifier energy consumption brake control circuit

When the motor stops and is disconnected from the AC power supply, DC
current is immediately passed through the stator winding to generate a static magnetic field, and the motor
continues . According to the electromagnetic theory, the current induced in the rotor winding is different from the static magnetic field. The action of the magnetic field
produces a braking torque in the opposite direction to the original direction, causing the motor to stop quickly. This
method of parking is accurate, but the braking process consumes electric energy and the rotor generates heat. Generally,
a resistor must be connected in series with the rotor circuit.
    Figure 4-24 shows the single-tube rectifier energy consumption braking control circuit . When stopping, press
the stop button SB2, KM1 and KT will lose power and be released. At this time, the KT delayed disconnection contact is still
closed, causing the brake contactor KM2 to be electrically activated, and the power supply is connected to
the motor . On the two-phase winding, the other phase returns to the neutral line through the rectifier tube
process ends. During this process, a torque opposite to the rotation of the rotor is generated, causing the rotor to stop as quickly as possible. The kinetic energy of the rotor is consumed in the rotor circuit
, so it is called energy consumption braking .
  This kind of braking circuit is simple, small in size and low in cost. It is often used in situations where motors below 10kW have low braking requirements.