Difference between energy consumption braking of DC motor and AC motor
Energy consumption braking of AC motor:The motor in normal operation, in order to stop quickly, not only disconnect the three-phase AC power supply, but also in the stator coil connected in the DC power supply, the DC current in the stator coil formed in the magnetic field, the rotor continues to rotate due to the inertia of cutting the magnetic field, the induced electromotive force and current formed in the rotor, the direction of rotation direction and torque motor instead, resulting in brake, the motor stops.Different torque is introduced into the rotor of the motor and different DC currents are connected in the stator of the motor, so different braking torque can be generated.Features: when the motor speed drops to zero, the braking torque will be zero, so the energy consumption braking can make the motor stop accurately
When the motor is operated in an electric state, if the armature voltage U is suddenly dropped to zero, the armature is connected with an additional resistor R. The two ends of the armature are disconnected from the power grid and are quickly connected to an appropriate resistor. The motor is in the running state of the generator, converting the kinetic energy of the rotating part into electric energy and consuming the resistance. With the kinetic energy consumption, the speed decline, braking torque is also becoming smaller and smaller, so this brake method is still relatively high in speed, braking role is relatively large, with the decline in speed, braking effect also decreases.
Energy consumption braking is a form of braking.It is divided into DC motor energy consumption braking and AC motor energy consumption braking.
