• Dharmambal V

This paper presents the Speed control of Induction motor by using Step-down Cyclo-converter. The speed of the Induction motor can be controlled by changing the frequency of the Cyclo-converter. Frequency at the output is proportional to the speed of the Induction motor. As the AC supply frequency can not be changed, thyristor/SCR controlled Cyclo-converter is used to control the speed in three steps. Pair of Frequency selector switches are provided to select the desired speed range (F, F/2 and F/3). These switches are interfaced with the microcontroller to generate PWM signal. The type of commutation used is Natural commutation to avoid the complexity in the design. The novelty in Cyclo-converter design is exhibited by the use of step down Cyclo-converter to reduce the switching rate of AC signal. At different frequencies and loads the speed of the Induction motor varies.

Induction motor, Step down Cyclo-converter, Commutation, PWM signal.

"SPEED CONTROL OF INDUCTION MOTOR BY THYRISTOR USING CYCLO-CONVERTER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 6, page no.555-559, June-2018, Available :http://www.jetir.org/papers/JETIR1806767.pdf

"SPEED CONTROL OF INDUCTION MOTOR BY THYRISTOR USING CYCLO-CONVERTER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 6, page no. pp555-559, June-2018, Available at : http://www.jetir.org/papers/JETIR1806767.pdf