International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Nowadays, development trends in induction motor electrical drives indicate that the next generation of electrical drives will include sensorless speed control. Speed control systems of induction motor drives without using mechanical sensors for speed measuring have the advantage of being low cost, and they are very robust due to the absence of mechanical component. In most cases, induction motor electrical drives used in industry do not require high speed dynamics. This paper gives sensorless scalar speed control of squirrel cage three phase induction motors based on slip frequency compensation by using a sinusoidal pulse width modulation strategy. Simulation results were obtained by using the Matlab/Simulink software. The proposed sensorless scalar speed control method is simple and is adequate for low-dynamics applications in industry.