PROGRAMMABLE SPEED CONTROL SYSTEM (PSCS): AN EFFICIENT APPROACH TO VARIOUS SPEED CONTROLS OF INDUCTION MOTORS

Traditionally, in most application where variable speeds are required speeds are required, the obvious choice is the induction motor which is commonly used in every electromechanical conversion system. This paper presents various speed reference points implementation of computer based speed control system connected to an induction motor (AC fan) using an assembly coded microcontroller (AT89C51). We wrote codes in assembly language via notepad, which must be saved as .asm file. The saved file was built with an assembler (MIDI - 51) which generated three files; hex file, obj file and list file. The hex file was used for the simulation of the design in Proteus 6 professional. Once the system is on and the sensor detects the present room temperature, the constant speed mechanical load moves directly proportional to the detected temperature. We also found out that this system work in a sequential manner, one can never jump any digital input or key in wrong inputs.