Speed Control of Single-Phase Induction Motor using AC Chopper by Asymmetrical PWM technique

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Speed Control of Single-Phase Induction Motor
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Speed Control of Single-Phase Induction Motor using AC Chopper by Asymmetrical PWM technique

OBJECTIVE

To control the speed of induction motor inverters are commonly used, but in this project AC chopper is implemented to control speed of single phase induction motor by implementing the asymmetrical PWM method the efficiency of the motor is improved and harmonics distortion in motor current will be reduced as compared to traditional PWM method. PI based control algorithm has introduced to control the speed of the motor.

ABSTRACT

Single phase motors are widely used in home appliances. The advantages of this motor are their ability to operate from a single phase power supply. Therefore they can be used whenever a single phase power is available. There are also other aspects for their popularity, low manufacturing cost, reliability and simplicity.

The most popular technique of supplying single phase AC motors is the conduction angle control. To carry out this control a triac device is used. The conduction angle is adjusted by changing the switching instant of the triac device. This method represents of cost effective solution but it produces a very high harmonic content in both motor and supply current waveform. After that many authors have suggested and analyzed the performance of the single phase induction motor fed from inverter circuit with space vector PWM but both methods need complicated circuit with high cost. However, AC chopper seems to be an acceptable solution when a wide range of speed control is required.

LITERATURE SURVEY

  1. Single Phase Induction Motor Speed Control Using Frog-Jumping Algorithm Technique

Assist. Prof. Dr. Ali H. Ahmad Ali Abbawi

An adjustable speed single phase induction motors are widely used in domestic applications and industries. It is difficult to get such a single phase induction motor practically. The present work deals with the analysis and design of a speed control for a single phase induction motor .

  1. Low cost speed control for single phase induction motors - comparing different approaches with regard to efficiency

Klaus Krischan, Guenther Dannerer, Oliver Koenig, Roland R. Seebacher

Operating single phase fed motors across a wide range of speed and load with high efficiency is of growing interest. The paper at hand presents an investigation into the efficiency of different low cost variable speed drive concepts (namely Phase Control, Integral (Half) Cycle Control and Integral Switched Cycle Control) based on capacitor run single phase induction motors.

  1. Speed Control For Variable-Speed Single-Phase Induction Motor Drives

RonilsonRocha , Luiz de Siqueira Martins Filho , Julio Cesar David de Melo

In this paper, a control strategy is proposed for adjustable speed drives for single-phase induction motors. This strategy guarantees the level of magnetization while improving the machine efficiency

EXISTING SYSTEM

Conventional method for starting and speed control of single phase induction motor need often quite expensive external electrical equipment. Moreover, they require mechanical switches, which are more troublesome part. These switches suffer from mechanical wear, which affects the motors performance

PROPOSED SYSTEM

This paper describes the simulation of a single phase induction motor by ac chopper, which uses asymmetrical PWM technique to reduce the harmonics present in the motor current. The flow of power to the motor is controlled by a switching action of the power switches, which thereby control the speed of the induction motor. In this paper ac chopper module uses the IGBT as a power switch because of having more advantages over other power switches(MOSFET,THYRISTOR ETC)

BLOCK DIAGRAM

ADVANTAGES

Conventional method for starting and speed control of single phase induction motor need often quite expensive external electrical equipment. Moreover, they require mechanical switches, which are more troublesome part. These switches suffer from mechanical wear, which affects the motors performance. In case of proposed system, By the improvement of the power electronic devices, flow of power to the motor is control by the switching action of power switches (MOSFET, IGBT etc).

APPLICATIONS

  1. Home appliances
  2. Pumping motor
  3. Industrial applications
  4. Traction system

REFERANCES

  1. Simulation & Implementation Of Three Phase Induction Motor On Single Phase By Using PWM Techniques BAM University Ashwini Kadam1 ,A.N.Shaik Engineering, [email protected],9960158714
  2. G.Choe,M.park, An improved PWM Technique for A.C. Chopper. P.C.SEN, principles of electric machines & power electronics, wiley 1999
  3. M.M.R. Ahmed and M. Soliman, Speed Control of AC Series Motor Using AC Chopper Voltage Control ,IEEE Electrical Power & Energy Conference, 2010 IEEE
  4. DO-HYUN JANG, improvement of input power factor in ac choppers using asymmetrical pwm technique, transactions on industrial electronics, vol. 42, no. 2, pp.179 185. APRIL 1995

 

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