APPLICATION OF MULTIMODE MATRIX CONVERTER FOR WASHING MACHINE

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In this paper, multimode matrix converter is used to universal motor speed control system developed for proposed washing machine. Output voltage is synthesized by SPWM technique. In washing machines, the use of Induction motors wastes energy. To achieve speeds like tumbling operations at low speed and say drying at a spin cycle at a high speed, one needs to use a universal motor. Switching the voltage for achieving different speeds is again wasteful, so some companies have introduced ‘variable frequency’ drives. This saves power but increases the cost of the drive. A design using multimode multiple’ matrix converter’ is proposed. In this the output voltage is synthesized by switching IGBTs in a matrix. Switching is done by control signals generated using SPWM techniques. A computer simulation model was developed using MATLAB. Simulated results have been observed and analyzed

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APPLICATION OF MULTIMODE MATRIX CONVERTER FOR WASHING MACHINE

  1. 1. International Journal of Advances in Engineering & Technology, Mar. 2013.©IJAET ISSN: 2231-1963 APPLICATION OF MULTIMODE MATRIX CONVERTER FOR WASHING MACHINE Sanjay Mohite1, Narayan Pisharoty2 1 Research Scholar, Symbiosis International University, Pune India 2 Department of E&TC Engg, Symbiosis Institute of Technology, Lavale Gram, Pune IndiaABSTRACTIn this paper, multimode matrix converter is used to universal motor speed control system developed for proposedwashing machine. Output voltage is synthesized by SPWM technique. In washing machines, the use of Inductionmotors wastes energy. To achieve speeds like tumbling operations at low speed and say drying at a spin cycle ata high speed, one needs to use a universal motor. Switching the voltage for achieving different speeds is againwasteful, so some companies have introduced ‘variable frequency’ drives. This saves power but increases the costof the drive. A design using multimode multiple’ matrix converter’ is proposed. In this the output voltage issynthesized by switching IGBTs in a matrix. Switching is done by control signals generated using SPWMtechniques. A computer simulation model was developed using MATLAB. Simulated results have been observedand analyzedKEYWORDS - Multimode, SPWM MATLAB Simulink, washing machine I. INTRODUCTION Electrical power converters play an important role in energy saving. Two thirds of all electrical energygenerated is consumed in industry. The industrial drive technology can be classified into two differentgroups. One group includes electrically driven machines requiring speed control systems for differentapplications for example, machine tools and measuring machines for which precision in movement isrequired. Second group includes consumer electrical systems, for example pumps, washing machines,food processors, vacuum cleaners and fans where precision torque or speed control systems are notneeded. Common disadvantages of these systems are poor efficiency and distortion. This has resultedin large energy consumption. The energy consumption can be significantly reduced by increasing theoverall efficiency of converters. Challenges such as High efficiency, reduced noise, extended lifetime,rapid time to market - and all at optimum cost are facing many Industries which use electric motors.Today, the demand for electronic converters for motor control is increasing rapidly, not only in theautomotive and computer peripherals Industries, but also in industrial applications and home appliancessuch as heating and ventilation systems, power tools, vacuum cleaners and washing machines. All theseconsumer applications need cost-effective solutions without compromising quality. Universal speedcontrol system developed with pwm AC Converter. Operation of this converter is realized usingmicrocontroller. Using simulation behavior of the system is verified [1]. To increase the performanceof the motor drive, need to improve stability of the drive system. Pulse width modulation is used toincrease capability of power device to handle large power [2]. Two switches AC chopper voltageregulator with control strategy is developed and operation modes are analysed. This voltage regulatorhas improve input power factor and power transfer efficiency. Harmonic distortion is low [3]. The Drumwashing machine requires high torque because large variation in load torque. So in this paper suggestinterior permanent magnet synchronous motor for drum washing machine system [4]. Two quadrantPWM AC chopper presented. The simple control principle is implemented in pwm AC chopper. Itreduce the losses and increase supply quality. PWM AC choppers have important advantages: 291 Vol. 6, Issue 1, pp. 291-297
  2. 2. International Journal of Advances in Engineering & Technology, Mar. 2013.©IJAET ISSN: 2231-1963sinusoidal current, waveforms, better power factor [5]. High performance Dc chopper speed controlsystem and current control system for universal motor is introduced in this system .In this system innercurrent control is used for improving dynamic response and motor startup with closed speed[6]. Thedevelopment of general purpose universal board that is capable of .controlling the speed of inductionmotor. This technique is variable frequency supply. It keeps constant voltage to frequency ratio in orderto attain constant torque throughout operating period [7] PWM technique for the three-phase MC thatreduces the switching losses by two ways either decreasing the number of switches and clamping theoutput voltages of the MC synchronized with the peak of the corresponding currents [8] Single phasequasi Z source ac-ac converter developed with high efficiency low input harmonics and high inputpower factor [9].In the Washing machine variable torque is needed. Torque varies according to the weight of clothes. Inthe laundry large amount of clothes are washes. It requires high torque motor drive. This paper ISfocused on speed control of ac motor and increase efficiency of converter.II. TRADITIONAL WASHING MACHINE DRIVEIn the laundry washing machine three phase motor is used while in household washing machineuniversal motor is used. Today static converters for the power supply of electrical drives are built by acombination of Input rectifier, DC link and Output inverter. It has two stage conversions. In two stagesconversion reduces the efficiency and losses are increased . Figure 1 Block diagram of laundry Washing machine drive.Figure 1 shows Block diagram of laundry Washing machine drive. In this system two stage conversionsare used. First stage Input AC is converted in to DC. Energy is stored in DC link capacitor. And insecond stage DC is converted in AC supply with variable frequency. Current Sensor 1 ACSupply ZCD Control Unit TRIAC Driver 2 1 Universal Motor 2 Figure 2 Block Diagram of AC universal motor drive 292 Vol. 6, Issue 1, pp. 291-297
  3. 3. International Journal of Advances in Engineering & Technology, Mar. 2013.©IJAET ISSN: 2231-1963Figure 2 shows block diagram of AC universal motor drive. In the same block diagram at the inputRectifier is added and same circuit can be used as Universal DC motor drive. Triacs are used as powerdeviceThe AC drive controls the rotation speed of universal motor by using phase angle method. This methodconsists of changing the RMS voltage applied to the motor. In this case, the voltage is a function of thefiring angle of the Triac.In the washing machines High-frequency PWM universal motor drive is also used. Traditionalconverters are currently used in the washing machine drives. These are connecting single load acrossoutput. It drives either universal motor or heater. For driving both loads two converters are required.We introduce Multimode matrix converter. It drives two loads simultaneously.III. MULTIMODE MATRIX CONVERTER FOR WASHING MACHINEMultimode matrix converter drive system is used single conversion. Input is directly connected tooutput. No energy storage element is required. This topology reduces the losses because one stage iseliminated. Efficiency of converter is increased. Thus energy the consumption of system is decreased.Figure 3 Block Diagram of multimode matrix converter washing machine drive used for laundry. (Three Phase)Block Diagram of multimode matrix converter washing machine drive used for laundry is shown infigure 3. It is three phase to three phase matrix converter. In the matrix converter IGBT s are used asswitches. Switching of these IGBTs are controlled using Sinusoidal Pulse Width Modulation Techniqueto get desired output.In Household washing machines universal motor and induction motor is used. For washing machineapplication high starting torque is required. The advantages of universal motors are specifically highstarting torque, very compact design and high running speeds. The disadvantage of this motor is themaintenance and short life caused by the commentator. Multimode Matrix AC Motor Input Supply Converter 220 Volt, 50 Hz Electric Heater Control Logic Figure 4 Block Diagram of Multimode matrix converter washing machine drive used for HomeFigure 4 Block Diagram of multimode matrix converter washing machine drive used for Home Thismultiple converter is capable to drive two motors simultaneously. This converter is drive two ac loads 293 Vol. 6, Issue 1, pp. 291-297
  4. 4. International Journal of Advances in Engineering & Technology, Mar. 2013.©IJAET ISSN: 2231-1963simultaneously. Control and logic block contains control circuit. Matrix converter block contains powercircuit.IV. POWER CIRCUITArrangement of multimode Ac converter is shown in figure.5. S4 S3 1 Input Voltage 220 Volt 50 Hz Universal Motor S2 V1 2 S1 Heater coil Figure 5 Proposed Switch Matrix of multimode matrix converter washing machine drive used for Home.Four switches are required for multimode matrix AC-AC converter. These switches are arrangedaccording to figure 5.It forms a four by one matrix. Two loads are connected to multimode converter.Universal motor and heater are connected across load. V. CONTROL STRATEGY FOR MULTIMODE MATRIX CONVERTEROperation of multimode matrix converter is divided in to two states.State 1 (0-π)In the state one IGBT S1 and IGBT S 3 turn on and current flowing through universal motor as well asheater simultaneously. Positive voltage appears across load.State 2 (π-2π)In the state one IGBT S2 and IGBT S 4 turn on and current flowing through universal motor as well asheater simultaneously. Negative voltage appears across load.Table 1 shows the switching status of the switches in state 1 and state 2 Table 1 Status of switches in state 1 and state 2 State/Switch S1 S2 S3 S4 Input Output State 1 (0-π) 1 0 1 0 +Ve +Ve State 2 (π-2π) 0 1 1 -Ve -VeVI. SIMULATION MODEL OF MULTIMODE MATRIX CONVERTER FOR WASHING MACHINEMultimode matrix converter concept is verified using simulation. 294 Vol. 6, Issue 1, pp. 291-297
  5. 5. International Journal of Advances in Engineering & Technology, Mar. 2013. ©IJAET ISSN: 2231-1963 Figure 6 Simulation Model of multiple matrix converter washing machine drive used for Home Figure 6 shows Simulation Model of multiple matrix converter washing machine drive used for Home. Same model can be used for different application such as power tool control, food processor, vacuum cleaner etc. SPWM technique is used to control desired output voltage across load. Sine wave block generates sine wave signal. Repeatating sequence block generates triangular wave. Sine wave is compared with triangular wave using relational operator block. Output of relational operator block is SPWM signal. SPWM signal is ‘AND’ ed with the square wave. Output of ‘AND’ gate is connected to IGBT gate.VII. SIMULATION RESULTS Simulation results are shown below. Figure 7 shows simulated SPWM output. Output across heater is shown in figure 8 It Increases the efficiency of converter. It is observes clean AC waveforms across input and output. Figure 9.shows total current flowing through the both winding. Current flowing through the main winding and auxiliary winding decides the power consumption of motor. It observes no distortion in main winding and auxiliary wing current. Distortion less output increase performance of motor and consume less power. Current flowing through main and auxiliary windings is shown in figure. 10 & 11. Voltage across capacitor is shown in figure 12.characteristic of rotor speed is shown in figure 13.Figure 14.shows electromagnetic torque of motor. Figure 7. Simulated SPWM output 295 Vol. 6, Issue 1, pp. 291-297
  6. 6. International Journal of Advances in Engineering & Technology, Mar. 2013. ©IJAET ISSN: 2231-1963 Input Voltage 100 Voltage 0 -100 0 0.01 0.02 0.03 0.04 time Output Voltageoad Figure 9. Total current flowing through both winding 100 Voltage 0 -100 0 0.01 0.02 0.03 0.04 time Figure 8. Output Voltage across Heater Figure 10. Current flowing through main winding Figure 11. Current flowing through Auxiliary winding Figure 12. Voltage across Capacitor Figure 13 Rotor speed Figure 14 Electromagnetic TorqueVIII. CONCLUSION The simulation model on Multimode Matrix Converter for washing machine using MATLAB/Simulink Software Package has been presented. The Results are presented for both loads of operation. The multimode matrix converter topology for multiple AC-AC conversion using the single circuit has presented with SPWM Strategy to synthesize the multiple AC output for a given AC input. The simulated Results are confirming the proposed methodology. After the success the Authors have had in building some circuits and building simulation models for many more applications, the authors feel that the technology of power conversion using matrix converter topology can be extended to many other applications. The approach of FIRST building a simulation model and then building a large power 3 phase to single phase conversion at 20 kHz, has given us the confidence that this topology can be used to build a converter to control the speed in a washing machine drive. The simulation results encourage us and we hope others to build different applications after first building a simulation model. 296 Vol. 6, Issue 1, pp. 291-297
  7. 7. International Journal of Advances in Engineering & Technology, Mar. 2013.©IJAET ISSN: 2231-1963IX. FUTURE WORKThe work described here in this paper also will be built as a hardware Prototype project and published.If the work is good and good results are found we may encourage to file for a patent.REFERENCES [1] Bakan A.F, Bakan A.F.Sarul M.H., Universal Motor Speed Control with Current Controlled PWM AC Chopper by using a Microcontroller, IEEE International Conference on Industrial Technology,Vol.1 2000, 394-398. [2] M. Narendra Kumar, P. Sujatha and K.S.R. Anjaneyulu, Verification of Four Switch PWM AC Chopper Fed Single Phase Induction Motor, Journal of Theoretical and Applied Information Technology 2009 13- 18. [3] Jin Nan1, Tang Hou-Jun, Bai Liang-Yu, Geng Xin and Yang Xiao-Liang, Analysis and Control of Two Switches AC Chopper Voltage Regulator, Wseas Transactions on Circuits and Systems Issue 4, Volume 9, 2010 208-217 [4] Sang-Hoon Park, Jung-Hyo Lee, Young-Ryul Kim and Chung-Yuen Won, Control of IPMSM drive system for drum washing Machine,7th International Conference on Power Electronics 2007 930-935. [5] Floricau, PWM AC Choppers: Basic Technologies and Applications, U.P.B. Sci. Bull., Series C, Vol. 68, No. 4 2006 91-106 [6] Huangsheng Xu, King K,and Jani Y.,High Performance DC Chopper speed and Current control of Universal Mototor using a Microcontroller, Industry Application Conference 2007 701-705 [7] Talukder P.,Soori P.K.,and Aranjo B. ,Speed control of Induction Motor drive using Universal controller, Power engineering and Optimization Conference Melaka 2012 509-514 [8] Fabrício Bradaschia, Marcelo C. Cavalcanti, A Modulation Technique to Reduce Switching Losses in Matrix Converters, IEEE Transactions On Industrial Electronics, Vol. 56, NO. 4, APRIL 2009 pp.1186- 1195. [9] Minh-Khaj Nguyen,Young-Gook Jung, Single-Phase AC–AC Converter Based on Quasi-Z-Source Topology, IEEE Transactions On Industrial Electronics, Vol. 25, NO. 8, August 2010 pp.2200-2210.AUTHORSSanjay Mohite, has received the B.E. Electrical Engineering from Pune University May2002, M.E. in Electronics Engineering from Dr. Babasaheb Ambedkar MarathwadaUniversity in May 2007. He is pursuing Ph.D in Electronics & TelecommunicationEngineering from Symbiosis International University; Pune India. He is currently working asa lecturer with Department of Electronics and Telecommunication Engineering, inJaywantrao Sawant College of Engineering Pune India. His research interests includes Matrixconverter drives, Embedded system design, &Renewable energy sourcesNarayan Pisharoty, has received his B.Tech from IIT Bombay in 1966, Masters from IITKanpur in 1968 and Ph.D. from Carnegie-Mellon Univ. in 1971 all in EE. He ran his ownDigital Equipment Design and Manufacturing Company till 2004. Currently he is a Professorand Head of E&TC Department at Symbiosis Institute of Technology, Lavale, and Pune. Hisinterests include Alternate Energy Sources, RFID and Bio-Medical Engineering. 297 Vol. 6, Issue 1, pp. 291-297

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