Basically the braking system for electric motor fundamental is a one mechanism to created retarding torque to stop the motor rotation with sudden or slow stop depend on application system.
Not all electric motor must have braking system.Normally it used for drive application that have lot of energy stored in rotating part for machine or equipment.It also used for driven system that required rapid deceleration and can controlled for accident or emergency situation.
Method to created a braking torque
For the method to created a braking torque and quick stop for induction motor,it have a two basic method such as :
1) Design the controller to made motor operated as a generator.Example is d.c injector method.
2) Created a device to reversing the rotation to created load until it stop.Example is plugging method.
In a new technologies for equipment or machinery,braking system have a intelligent controller to created a high accuracy for stop the electric motor.It also designed with full safety device and application to ensure for comfortable and safety priority to human being.