Projeto e execução de um freio mecânico automatizado

Abstract

This research is the design and implementation of a braking device coupled to an induction electric motor. To implement this study we used a mechanical brake disc, which when clicked produces the braking of the motor and therefore produces the same mechanical load. A conventional disc brake pads has to compress the disc, hydraulically transmitting the force of forceps by a main hydraulic cylinder which is driven by varying the pressure applied to an air cylinder attached to it. The variation of pressure in the pneumatic cylinder causes the brake and application of mechanical load to the engine can therefore be varied by increasing or by reducing the pressure value applied in the cylinder. The pressure and therefore the brake can be done manually by a conventional pressure regulator automatically or by PLC, and with the aid of a proportional valve. Using Easy Soft CoDeSys, utilized software for the development of programming plc, was created a monitoring system that allows the user access to a man-machine interface. With this interface can drive up to five types of motor starts, increase or decrease the pressure of the pneumatic cylinder and the mechanical load, and also enable the visualization of the behavior of current in the three motor phases depending on the type of the selected starting. The brake and all its electromechanical assembly, called bench brake was tested for different types of mechanical loading and departure. The responses to the application of mechanical load to the engine proved to be satisfactory, so the bench can be used in practical classes of electrical drives because it allows the visualization of the behavior of the chain for the various types of game with no load, rated load and overload applied to the motor shaft.