ISSN 2278 - 8875 International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering Vol. 1, Issue 3, September 2012 Copyright to IJAREEIE www.ijareeie.com 126 Modeling & Simulation of PWM Controlled Cycloconverter FED Split Phase Induction Motor Vinamra Kumar Govil 1 , Yogesh Chaurasia 2 Dept.of Electrical Engg. Adesh Institute of Engg. & Technology, Faridkot, Punjab, India Dept. of Electrical & Electronics Engg. Saroj Institute of Technology and Management, Lucknow, Uttar Pradesh, India Abstract: Single Phase induction motors are widely accepted motor due to their energy efficient characteristics. To drive varying mechanical loads for long duty the machine needs to be controlled to increase its efficiency and minimize transient. To control the output parameters of the motor i.e., Speed and Electromagnetic torque the fixed frequency of the system is varied for which a Cycloconverter is employed along with PWM technique to increase the system efficiency. The Cycloconverter is built on with IGBT due to its improved dynamic performance and efficiency and reduction in the level of audible noise. Low driving power and a simple drive circuit due to the input MOS gate structure. It can be easily controlled as compared to current controlled devices (Thyristor, BJT) in high voltage and high current applications. With the help of PWM the output voltage control can be obtained without addition of any external components and PWM minimizes the lower order harmonics, while the higher order harmonics can be eliminated using a filter Keywords: 1-phase Cycloconverter, Split phase Induction Motor, PWM pulse generator, IGBT MATLAB R (2010a). I. INTRODUCTION Analysis of induction motors controlled with Cycloconverter has been investigated extensively .The single phase induction motor in its simplest form is structurally the same as a poly phase induction motor having a squirrel cage rotor, the only difference is that the split phase induction motor has single winding on the stator. The split phase induction motor is the most commonly used motor in the utility network which produces mmf stationary in space but alternating in time, a polyphase stator winding carrying balanced currents produces mmf rotating in space around the air gap and constant in time with respect to an observer moving with the mmf Split phase induction motors are usually built with small power, they are widely used in domestic and commercial applications. This paper shown a speed control scheme for a split phase induction motor fed with Cycloconverter. Cycloconverter are used in very large variable frequency drives with ratings from few megawatts up to many tens of megawatts.. A single-phase input Cycloconverter is shown in Fig.1, single-phase input to single-phase output Cycloconverter is shown in Fig.4, the simplest Cycloconverter circuit..The single phase induction motor in its simplest form is structurally the same as a poly phase induction motor having a squirrel cage rotor, the only difference is that the split phase induction motor has single winding on the stator. The split phase induction motor is the most commonly used motor in the utility network. which produces mmf stationary in space but alternating in time, a polyphase stator winding carrying balanced currents produces mmf rotating in space around the air gap and constant in time with respect to an observer moving with the mmf. Split phase induction motors are usually built with small power, they are widely used in domestic and commercial applications. IGBT have the advantage for high speed, high power switching for building PWM controlled Cycloconverter. Section II gives you overview of the IGBT built Cycloconverter with its features and basic operation. Section III deals with modeling of Split phase induction motor where the speed and torque equation are mathematically derived. Section IV deals with PWM generator how a PWM pulse is generated and useful. Section V deals with the desired simulation result for pwm controlled Cycloconverter. Section VI deals with future application and scope and section VII is conclusion. II. CONCEPT OF CYCLOCONVERTER MODEL The Cycloconverter model is constructed. To begin, all of the input voltages are constructed using sinusoids as the input. Rather than producing the line voltages in addition to the phase output voltages, the phase voltages has shifted forward 30 degrees to produce the timing waveforms as in Fig. 5.1. The reference waveform is then added, and the timing waveforms are transformed into those in Fig. 5.2. At this point the construction of the output waveforms begins; Boolean variables contain the information of which