PERFORMANCE ANALYSIS OF SWITCHED RELUCTANCE MOTOR; DESIGN, MODELING AND SIMULATION OF 8/6 SWITCHED RELUCTANCE MOTOR

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1 5 - JATIT. All right reerved. PERFORMANCE ANALYSIS OF SWITCHED RELUCTANCE MOTOR; DESIGN, MODELING AND SIMULATION OF / SWITCHED RELUCTANCE MOTOR Vika S. Wadnerkar * Dr. G. TulaiRam Da ** Dr. A.D.Rajkumar *** *Mr. Vika S Wadnerkar i with Ear teel, Hazira, Surat a a Faculty Electrical Engineering and **Dr. G. Tulai Ram Da with JNTU College of Engineering, Hyderabad and ***Dr. Rajkumar are with College of Engineering, Omania Univerity, Hyderabad. ABSTRACT The Switched reluctance Motor (SRM) i an old member of the Electric Machine Family. It imple tructure, ruggedne and inexpenive manufacturing capability make it more attractive for Indutrial application. However thee merit are overhadowed by it inherent high torque ripple, acoutic noie and difficulty to control. In thi work Deign, modeling, imulation and analyi of Switched Reluctance motor ha been done. Variou model of Switched reluctance Motor Linear and nonlinear model with different control trategie are imulated in /SIMULINK. The control trategie ued are PI Control, Hyterei Control and voltage control. The reult obtained from imulation ha been verified practically. The control ignal and circuit deign for operation of a Switched Reluctance Motor (SRM) drive ha been decribed. The control circuit ha been realized uing microcomputer ytem. The technique developed i uitable for implementation with recent DSP proceor. The reult obtained from the prototype drive compared with thoe obtained in imulation. The microproceor/microcontroller/dsp ha permitted the reduction of the hardware to a minimum. The technique developed can eaily be ued in implementation baed on more powerful proceor. In the cheme the problem caued by the harmonic ha not been conidered. Key Word: SRM, PI Control, Hyterei Control, Voltage Control, Nonlinear. INTRODUCTION The electrical drive play an important role on the productivity to any indutry. The requirement of drive depend upon the available main and load characteritic. Bruhle variable peed drive uing SRM have become popular relative to other drive and repreent an economical alternative to PM bruhle motor in many application. In lat few year the SRM have gain increaing attention ince they offer the poibility of electric drive which are mechanically and electrically more rugged than thoe build up around the conventional AC and DC motor. In cae of SRM drive, the technical uperiority of the AC drive i obtained or even enhanced at a very low cot. Thi i poible due to the imple motor contruction and the requirement of a imple uni-.polar power modulator for controlling the peed. In order to get performance oriented Drive, The accurate modelling of a Motor i to be done. The performance of machine can be checked with the help of Matlab / Simulink. Thi help to deign the Controller for the motor. Modeling can be done with the help of mathematical equation. Thi Paper compared different technique for the modelling of a SRM in view of it nonlinear magnetization characteritic due to the doubly alient tructure(). It propoe an application of ANN to identify the nonlinear model of SRM` from operating data (). The imulated performance of SRM Drive ytem i preented to analyze the effect of witching angle on tranient and teady tate performance of the Drive in term of peed, Current and torque repone (). A new analytical repreentation and imulation of the phae inductance of SRM uing matlab/mfile i preented (). Simulation method ha many advantage: It i free from expreion Can be applied widely Demontrate inductance profile uing motor parameter only

2 5 - JATIT. All right reerved. Save run time The paper preent dynamic modeling of a commercially available -HP, Phae / SRM uing nonlinear D look up table created from it meaured flux linkage and tatic torque data. A model for each phae conit of a flux linkage etimator; a current look up table and a torque look up table (5). Thi paper preent a implified nonlinear model for the SRM, which ue the fundamental mathematical function to decribe the aturation of the flux linkage depending on the winding current and rotor poition. The model require a minimum of pre-calculated or meaured input data (). A matlab/simulink environment to imulate / SRM i decribed. Dynamic from Linear to nonlinear model ha been dicued (7). The AC mall ignal modelling technique i propoed for liberalization of SRM model uch that a conventional PI controller can be deigned accordingly for PWM current controller (). A nonlinear dynamic model of SRM i preented and a concie model of the phae inductance veru current and rotor poition relationhip of an SRM i propoed(9). Decribe torque production in a aturated SRM uing the unaturated form of he torque equation ().. SWITCHED RELUCTANCE MOTOR In Switched Reluctance Motor the torque i developed becaue of the tendency of the magnetic circuit to adopt the configuration of minimum reluctance i.e. the rotor move in line with the tator pole thu maximizing the inductance of the excited coil. The magnetic behavior of SRM i highly nonlinear. But by auming an idealitic linear magnetic model, the behavior pattern of the SRM can be adjuted with eae of without eriou lo of integrity from the actual behavior pattern.. CONSTRUCTION OF SRM The phyical appearance of a Switched Reluctance motor i imilar to that of other rotating motor (AC and DC) Induction Motor, DC motor etc. The contruction of / ( tator pole, rotor pole) pole SRM i hown in fig.. It ha doubly alient contruction. Uually the number of tator and rotor pole i even. The winding of Switched Reluctance Motor are impler than thoe of other type of motor. There i winding only on tator pole, imply wound on it and no winding on rotor pole. The winding of oppoite pole i connected in erie or in parallel forming no of phae exactly half of the number of tator pole. Therefore excitation of ingle phae excite two tator pole. The rotor ha imple laminated alient pole tructure without winding. Thi i the advantage of thi motor a it reduce copper lo in rotor winding. The tamping are made preferably of ilicon teel, epecially in higher efficiency application. For aeropace application the rotor i operating at very high peed, for that cobalt, iron and variant are ued. The air gap i kept a minimum a poible, epecially. to.mm. The rotor and tator pole arc hould be approximately the ame. If the rotor pole arc i larger than the tator pole arc it i more advantageou.. DEVELOPMENT OF TORQUE The mot general expreion for the torque produced by one phae at any rotor poition i, T = [ W`/ Ө] i = Cont..(.) Since W`=Co-energy = ½ F Φ = ½ N I Φ.) Thi equation how that input electrical power goe partly to increae the tored magnetic energy (½L*i ) and partly to provide mechanical output power ( i / x dl/dө x ω ), the latter being aociated with the rotational e.m.f. in the tator circuit. Neglecting aturation non-linearity L = Inductance = NΦ/ I.. (.) T = ½ i dl/dө..(.) Thi equation how that the developed torque i independent of direction of current but only depend on magnitude of current & direction of dl/dө. 5. GENERALIZED EQUATION OF MOTOR: The voltage equation i, V= r i +dψ / dt.. (.5) ψ=li=nφ...(. ) For r = V = L di/dt + i (dl /dθ) (dθ/dt) V = L di/dt + i ω (dl /dθ) (.7) 9

3 5 - JATIT. All right reerved.. MODELLING OF SRM Linear Model of SRM (Fig ) From Above equation of SRM the model for imulation i developed. Fig: phaetorque In Out To Workpace Step In Out torque peed phae Scope To Workpace To Workpace /J InOut Integrator Gain Integrator InOut F phae Scope Gain InOut InOut phae Scope InOut InOut phae Scope t Clock To Workpace Expanion of one of the phae (Fig ). 7. CONTROL STRATEGIES Different control trategie uch a Voltage control, PI control, Hyterei control For linear a well a nonlinear modeling ha been applied to get imulation reult. All imulation reult are hown below.. SIMULATION RESULTS OF SRM Simulation ha been made with Hyterei control and Voltage control for ingle pule operation. Variou reult obtained a hown in fig., fig. 5 and fig.. Chopping control reult are alo hown. Current through one Phae 9 volt To Workpace Gain R current To Workpace 7 5 In Relay witch Integrator inductance em torque em Out Out In pie inductance To Workpace Expanion of one of the phae (Fig ) Fig. 5 Current Chopping in one phae(x-axi current in amp, y-axi angle) Step Input Step Input Sum Mux PI In Out In phae torquevika Phae.. Inductance for All Phae Sum Mux ted fre In Out In phae In To Workpace peed To Workpace /J Integrator Gain Integrator Diplay F Phae Out In phae In Out In phae Gain u teta To Workpace t Clock To Workpace Phae Nonlinear Model of SRM (Fig ). Ab Phae K- R Fig. Inductance profile for four phae w.r t. angle Ө. In iref-i voltage witch v-ri / K- /p fluxo Scope table couple table couple torque Out In modulo pi/ angle peciale

4 5 - JATIT. All right reerved. Torque through All Phae Fig.7 Current in all the four phae with reference to angle Fig. Voltage control Linear mode Torque x - P hae Inductance Fig. Torque in one of the phae Current TH E TA Fig. Inductance profile Voltage control Linear mode 7 Inductance current Fig 9. Current in winding Non linear Hyterei control (x-axi current in amp, y-axi angle) Torque CURRENT Fig. Inductance, Current and Torque in one of the phae of Stator winding TH E TA Fig. Current in phae of the SRM Voltage control Linear mode (verified with experiment) 9. SYSTEM HARDWARE DESIGN The ytem circuit conit of the following module. The block diagram of propoed cheme i hown in fig... Power upply module. Converter module.

5 5 - JATIT. All right reerved.. Motor.. Pule modulator module. 5. Microproceor module.. Regulated power upply circuit module. Deign of Stator and rotor i hown in Fig. All other component and ytem ha been deigned to control / SRM. Electrical Specification: Supply voltage to volt DC.,Power Rating 5 watt.,speed rpm Mechanical Specification: No. Of tator pole = No. of rotor pole = Air Gap =. mm No. of turn per phae = Stator pole width mm, rotor pole width mm Cro ectional area of conductor.5mm Fig. The converter model Photograph: The experimental etup. EXPERMINTAL RESULTS The experimental reult are obtained and compared with imulation reult. The tet on the Drive ytem for open loop operation i performed. Practical verification ha been done with the help of tet bench a hown Current through one of the phae in blocked a well a in running condition ha been taken. The peed of SRM for variou ON time (pule width) i teted. The reult are hown below (fig - ).The variou tet reult from pule modulator alo been oberved. The practical et up for the developed ytem i hown in photograph. The imulation reult obtained in are hown (fig -). Given above for Inductance, Current and torque in voltage control & Hyterei control. CH= V m/div Fig 5: Deign of tator and rotor winding Fig: Current in one of the phae (Practical verification)

6 5 - JATIT. All right reerved. Speed in rpm Pule Width V Speed 5 5 Speed Pule Width in msec Speed Fig 7: Speed V ON Time (Practical verification) Applied Voltage V Speed 5 5 Speed Voltage Fig : Applied voltage V Speed. CONCLUSION From the imulation it i being oberved that the torque i developed during change of inductance. For contant inductance (unaligned poition) torque developed i zero. To get poitive torque Voltage hould apply during + dl/dө where a negative torque will develop during - dl/dө. Therefore exact witching (turn on and turn off angle) i needed. Simulation help to get exact witching angle. Alo the peed variation can be oberved in cae of nonlinear. From the deign of the motor it can be concluded that the tructure of the motor i very imple a compared to other AC and DC motor. The peed of the motor increae with decreae in witching ON time i.e. a witching frequency increae, the peed of the motor increae a hown in fig. Thi i ufficient to conclude that we can increae the peed with increae in witching frequency. The preent cheme i open loop cheme a the rotor poition encoder i not preent. The cloed loop control of SRM can give bet reult with wide peed range. Micro controlled or DSP baed ytem can be developed by which enor le operation of peed control can be achieved. The torque minimization can be alo be done uing ophiticated controller. The preent work i an approach to make a SRM drive and can give all information related to control trategy.. ACKNOWLEDGEMNT Fig 9: Torque in Single Winding (Practical verification). Fig: Current in one of the phae (Practical verification) [] Nonlinear Modeling of Switched Reluctance Motor uing artificial Intelligence technique, T. Latchman, T R Mohamad and C H Fong. IEE Proceeding Power Application Vol 5 No. Jan. [] Modelling and Parameter Identification of Switched Reluctance Motor from Operating Data Uing Neural Network, Wenzhe Lu, Ali keyhani, Harald Klode, Amuliu Proca, IEEE Proceeding June Page 79-7 [] Modelling, Simulation and Performance Analyi of Switched Reluctance Motor Operating with Optimum Value of Fixed Turn-On and Turn-Off Switching Angle, Hamid Ehan Akhtar, Virendra Sharma, Ambrih Chandra, Kamal Al-Haddad, June Page 97-

7 [] Simulation of a Switched Reluctance Motor Uing Matlab / M File Chong- Chul Kim, Jin Hur, Dong-Seok Hyun, page -7, IEEE Proceeding Nov [5] Dynamic Modelling of a Four-Phae / Switched Reluctance Motor Uing Current and Torque Look-up Table, Phop Chancharoenook, Muhammad F Rahman, IEEE Proceeding, Nov, page 9-9 Nov [] A nonlinear Analytical Model for Switched Reluctance motor, Liu Shanhan, Zhao Zhengming Proceeding of IEEE TENCON`, page [7] Spice-Baed dynamic analyi of Switched Reluctance Motor with multiple teeth per tator pole, Faiz J., Raddadi J., Finch J.W., Magnetic, IEEE Tranaction on, Volume, Iue, July, Page 7-7. [] Small Signal Modelling and Control for PWM Control of Switched Reluctance Motor Drive Xiaoyan Wang and Jih- Sheng Lai June, Page 5-55 [9] Simulation of Non-Linear Switched Reluctance Motor Drive with PSIM P. CUI, J G Zhu, Q P Ha Aug Page -. [] Simulation of a / Switched Reluctance Motor Baed on Matlab/Simulink Environment. F Soare, P. J. Cota Branco, IEEE Tranaction on Aeropace and Electronic Sytem, Vol 7, No. July. [] Modeling of a aturated Switched Reluctance Motor uing an operating point analyi and the unaturated Torque Equation Nichola J Nagel, IEEE Tranaction on Indutry application Vol, No. May/June. [] Starting Performance of Switched Reluctance Motor with Fixed Turn off Angle Control Scheme Hamid Ehan Akhter, Virendra K Sharma, A. Chandra Journal of Theoretical and Applied Information Technology 5 - JATIT. All right reerved. Note: The experimental reult are taken uing thermographic printer therefore reult hown above are canned from the original reult.

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