Users often confuse the functions of electromagnetic braking, regenerative braking, and dynamic braking, and choose the wrong components.
The dynamic brake consists of dynamic braking resistors. When there is a fault, an emergency stop, or a power failure, it uses energy consumption braking to shorten the mechanical feed distance of the servo motor.
Regenerative braking means that when the servo motor is decelerating or stopping, the braking energy is fed back to the DC bus through the inverter and absorbed by the resistive-capacitive circuit.
Electromagnetic braking is achieved by locking the motor shaft through a mechanical device.
The differences among the three are as follows:
(1) Regenerative braking only works when the servo is operating normally. It cannot brake the motor in cases such as faults, emergency stops, or power failures. The dynamic brake and electromagnetic braking do not require power during operation.
(2) The operation of regenerative braking is carried out automatically by the system, while the operation of the dynamic brake and electromagnetic braking requires external relays for control.
(3) Electromagnetic braking is usually activated after SV and OFF, otherwise it may cause overload of the amplifier. The dynamic brake usually starts after SV and OFF or when the main circuit is powered off, otherwise it may cause the dynamic brake resistor to overheat.