• Sanny N Khalas
• Hiren M. Patel
• Fagun N. Upadhyay
• Sanny N Khalas

The main aim of this paper is to control the speed of an induction motor by applying varying voltages to the motor by using thyristor so that its speed can be controlled. The paper uses zero crossing point of the waveform which is detected by a comparator whose output is then fed to the microcontroller. The microcontroller provides required delayed triggering control to a pair of SCRs through opto isolator interface. Finally the power is applied to the load through anti parallel SCRs in series. This paper uses a microcontroller from 8051 family which is interfaced through a push-button switch for increasing or decreasing the AC power to the load. A lamp is used in place of an induction motor (not supplied) for demo purposes in the paper whose varying intensity demonstrates the varying power to the motor. The varying power shall result in variation in the speed of the motor while the lamp is replaced by the motor. The paper can be further enhanced by using 2 such units in any 3 phase supply for 3 phase induction motor.

"SPEED CONTROL OF SINGLE PHASE INDUCTION MOTOR BY THYRISTOR", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.331-339, June 2019, Available :http://www.jetir.org/papers/JETIR1906T39.pdf

"SPEED CONTROL OF SINGLE PHASE INDUCTION MOTOR BY THYRISTOR", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp331-339, June 2019, Available at : http://www.jetir.org/papers/JETIR1906T39.pdf