Course Code: EE4105 Government Polytechnic, Pune "180 OB'- Scheme Programme Diploma in ET/CE/EE//ME/MT/CM/IT/DDGM_ Programme code 01/02/03/04/05/06/07/08/15/16/17/18/19/21/22/23/24/26 Name of Course ‘AC Machines Course Code EE4105 Prerequisite course code and | E3105 (DC Machines & Transformers) ss Declaration Yes 1. TEACHING AND EXAMINATION SCHEME Teaching | Total Examination Scheme Scheme Credits Theory Practical Total (in Hours) | (L+T+P) Marks L[T[/P| ¢ ESE PA ESE | PA Marks 30 20 25 25 | 150 3f1j2 6 Exam Duration 3Hr 1Hr - - Legends: L- lecture, T-Tutorial/teacher guided theory practice, P-practical, C-Credits, ESE-End semester examination, PA- Progressive Assessments(Test I, Il/Term Work), * - Practical Exam, $- Oral Exam. # - Online Exam., Each lecture/practical period is of one clock hour. 2, RATIONALE ‘The most popular drives used in industries as well as in other professional applications are either three phase induction motors or a single-phase induction motors. Hence for a technician working in the field, study of these motors is essential pertaining to their types, construction, working principle, operation, characteristics, applications, starting devices used etc. Hence the course of A C Machines is of vital importance. As electrical energy not available in natural form for transporting over a long distance, it is necessary to convert a naturally available energy into electrical energy. This is done at generating stations using machines that are known as Alternators. Being a machine of prime importance, it is necessary for an electrical engineer to study the ‘Alternator’. This course deals with construction, working principle, operation, characteristics, Application, Synchronizing Process & Parallel Operation of Alternators. The knowledge gained by the student is useful in the study of subjects such switchgear & protection, utilization of electrical power, testing and maintenance of electrical equipment and in their project work. The knowledge and skills gained will be helpful while performing duties of electrical supervisor, maintenance engineer, quality control engineer eteCourse Code: EE4105 3. COMPETENCY The aim of this course is to attain following industry identified competency through various teaching learning experiences: “Operate and Control various parameters of 3-phase Induction motor, 1-phase Induction motor& 3-phase alternator.” 4. COURSE OUTCOMES (COs) The theory, practical experiences and relevant soft skills associated with this course are to be taught and implemented, so that the student demonstrates the following industry oriented / profession demanding COs associated with the above mentioned competency: 1: Describe the construction of 3-phase alternator and three phase & single phase Induction motor. 2: Analyze the performance of 3-phase alternator and three phase & single phase Induction motor for finding derived parameters such as efficiency, power factor ete. 3: Operate the different types of starters and describe the various methods of speed control of three phase Induction motor. 4: Analyze the performance of three phase alternator by finding voltage regulation with different methods. 5: Synchronize an alternator with another alternator or supply bus bars & connections of alternators in parallel. 6: Select single phase Induction motor as per application & operate the motor accordingly. 5. SUGGESTED PRACTICALS/ EXERCISES The practicals in this section are sub-components of the Cos, to be developed and assessed in the student for the attainment of the competency: Un Relevant | Approx. Pr. Practical Exercises it co Hr. No. (Leaming Outcomes in Psychomotor Domain) . No required 1 | oy | To Wenlify the various paris of three phase IM, Also write the 1 02 function of each part _a) Squirrel cage _b) Slip ring. 2 | oy | te determine the slip of 3-phase IM. by a) Tachometer > oD b) Galvanometer Method ¢) Stroboscopic Method 3 To Perform load test on 3-phase IM. by pulley-belt 3 | 02 2 02 arrangement(brake test) 4 | 04 | Te Perform load test on 3-phase [M. by coupled to DC shunt 2 2 generator 5 | 03 | Study of following starters: a) DOL starter 3 oa b)Auto transformer starter ¢) Star ~delta starter ° 6 | og | Speed control of three phase I. M. by: a) Rheostatie control 5 oa b) Pole changing 7_| 02 | To perform 0.C. & S.C, test on 3-phase IM to draw circle diagram | _3 04 8 | 04 | Fe determine voltage regulation of 3-phase alternator by direct, 4 04 loading at: a) Unity p.f, _b) Leading pfCourse Code: EE4105 To determine voltage regulation of 3-phase alternator by 9 | 04 | performing O.C. test & S.C. test using 4 04 a) Synchronous impedance method _b) mmf method 10 | 05_| To synchronise an alternator with bus bar with lamp method 3 @ 11_| 06 | To perform no Toad test on I-phase LM. 6 02 Total 32 Performance Indicators Weightage in % a ‘Arrangement of available equipment or model for testin 15 b Setting and operation. 20 c Safety measures 20 d Observations and Recording 15 e Interpretation of result and Conclusion 15 f Submission of report in time 15 Total 100 6. MAJOR EQUIPMENT/ INSTRUMENTS REQUIRED The major equipment with broad specification mentioned here will usher in uniformity in conduct of practical, as well as aid to procure equipment by authorities concerned. Sr. PrO. No. No Equipment Name with Broad Specifications 1_[Tnduction Motor 3-phase — dismantled unit Pri 2 | Induetion Motor 3-phase — squirrel cage typed Slip ring Pr.2, Pr, Pra, Pr.6, Pro7 type 3__| Induction Motor 3-phase — Pole changing apparatus Pré 4 | Tachometer Pr.2 to Pri 5_| Wattmeters Pr.3, Pra, Prd 6 [AC Ammeters Pr.2 to Pr.7. 7_[AC Voltmeters Pr.2toPr.7 8 [DC Ammeters Pr Pr. 8, Pro, Pr.l0 9 [10D C voltmeters Prd, Pr.8, Pr, Pr.10 10 | Galvanometer Pr2 11_| Load bank -resistive, capacitive Prd, Pre 12__| Frequency meter Pr.l0 13__| Synchroscope Prl0) 14 | Stroboscope Pr2 15__| Induction Motor single-phase Pri 16 | Induction Motor three phase coupled to D C Generator Pra 17_| Altemator three phase (coupled with prime mover) Pr8, Pro, Pr.l0 18_| Synchronizing lamp apparatus Pr.l0. 19 | Three phase auto-transformer Pra, Prd 29 | Different Starters for Induction Motor — DOL, star/delta, | Pr4 rotor resistance etc.Course Code: EEA105 7. THEORY COMPONENTS- Unit Outcomes (UOs) (in cognitive domain) Topies and Sub-topies SECTION —I UNIT-1 Three Phase Induction Motor HRS—10 Marks -16 Ta, Explain constructional features of three phase IM. and differentiate between squirrel cage and slip-ring induction motors. Explain how rotating magnetic field is produced and working principle three phase induction motor. Understand the Slip and its significance in the operation of three phase induction motor. |. Develop an expression for rotor induced emf and current. Know the rotor parameters at standstill and running condition. . Derive torque equation of three phase induction motor & condition for maximum torque. Explain the torque- slip characteristics of induction motor Effect of change in supply voltage & rotor resistance on the characteristics. Describe various methods of slip measurement of three phase induction motor. 1j, Numerical 1.1 Induction motor: - Construction of LM., types, ‘Compatison between squirrel cage and wound rotor induction motors. Production of rotating magnetic field in 3 phase windings when balanced 3 phase supply given to them, Working principle of three phase ILM. Define Slip, Frequency of Rotor Induced Emf, Rotor Current. Equation of Rotor Induced Emf, Current, Rotor Resistance & Reactance, i.e., Impedance at Standstill & and under Running Condition. Torque equation of three phase induction motor. Starting and Running Torque of Induction motors. Condition for Maximum Starting and Running torque. Ratio of Full load torque to starting torque, full oad torque to maximum torque, maximum torque to starting torque 1.10 Torque- slip characteristies of three phase induction motor. 1.11 Effect of change in supply voltage on torque-slip Characteristics. 1.12 Effect of change in rotor circuit resistance on torque-slip characteristics. 1.13 Measurement of slip by a) Actual speed measurement b) Stroboscopic method c) Galvanometer method 1.14 Numerical on above topics. 12 13 14 15 19 UNIT-2 Performance of Three Phase Induction Motor HRS-8 Marks -14 2a, State the losses in LM. and determine the efficiency. Explain the power flow diagram of three-phase induction motor. Explain the equivalent circuit of three phase induction motor. 2b. 2e. 2d. Draw circle diagram by 2.1 Various losses in induction motor and efficiency, 2.2 Power flow diagram of induction motor calculation of efficiency from power flow diagram. 2.3 induction motor as short-circuited transformer. 2.4 Phasor diagram of induction motor 2.5 Equivalent circuit of three phases induction motor (No numerical) 2.6 Graphical method to find performance of Three phase LM. by performing open circuit test &Course Code: EE4105 Unit Outcomes (WOs) (in cognitive domain) Topics and Sub-topics performing O.C&S.C test on 3-phase IM. short cirouit test. Construct the circle diagram and plot following points: a) Full load b) Maximum output c) Maximum torqued) Maximum input 2.7 Numerical on circle diagram UNIT-3 Induction motor control & Aj pplications HRS —6 Marks - 10 3a, Explain various methods of speed control of 3 phase induction motor. 3b. Justify the need of starter for induction motor and describe various methods of starting. 3c. List the applications of various types of induction motors. 3d, Explain constructional featur characteristics of double squirrel cage induction motor & list out its applications. 3.1 Speed control of three phase induction motor By : a) Pole changing method b) frequency control method, c) stator voltage control, d) PWM technique, e) Rotor resistance control method 3.2 Necessity of starter. 3.3 Types of starters. a) DOL Starter. b) Star/delta starter, c) Auto transformer starter 4) Rotor resistance starter €) Soft starters, 3.4 Applications of three phase Induction Motors. 3.5 Comparison of IM. with DC shunt motor. 6 Construction, Characteristics and Applications of double squirrel cage Induction Motor. SECTION - IT UNIT Three Phase Alternator 16 HRS-10 | Marks- 4a. Describe the function of different parts of an alternator with sketches. Explain the working principle of an alternator. 4c. Derive emf equation of an alternator Explain the factors affecting on terminal voltage of an alternator. 4e. Determine the voltage Regulation of an alternator by different methods 4b. 4d. 41 Construction of three phase Altemator, a) Armature windings b) Rotor- salient pole type & non salient pole type. 4.2 Advantages of stationary armature, construction. 4.3 Excitation of rotor field system, 4.4 Working principle of an alternator 4.5 E.m.f. equation of Alternator 4.6 Effect of short pitch coil on induced emf and pitch factor. 4.7 Effect of distributed winding on induced emf and distribution factor. 4.8 Use of damper winding. 4.9 Factors affecting the terminal voltage of alternator a) Armature resistive drop b) Leakage reactance drop. ¢) Armature reaction at various power factors. 4) Concept of Synchronous impedance. €) Phasor diagram of alternator on different loads, 4.10 Regulation of three phase Alternator byCourse Code: EE4105 Unit Outcomes (UOs) (in cognitive domain) Topics and Sub-topies 2) Direct loading b) Synchronous impedance method c) mmf method. UNIT-5 Three Phase Alternator- Parallel Operation HRS—8 Marks-12 Sa, Understand the synchronization of an alternator. 5b, Parallel operation & load sharing of alternators and Numerical Se. Understand the effect of change in excitation & change in input power (steam supply) 5.11 Synchronizing by 1) All dark method 2) One dark and two bright lamps 3) Synchroscope. 5.12 Synchronizing current, power and torque. 5.13 Parallel operation of alternators and advantages. 5.14 Load sharing in parallel alternators. 5.15 Numerical on load sharing of single phase & threephase alternators. 5.16 Effect of change in excitation, effect of ‘Change in input power (steam supply) UNIT- 6 Single Phase Induction Motor Hrs- 06° Marks-12 6a. Explain the double field revolving theory & working principle of single phase LM. 6b, Describe the constructional features of different types of single phase LM. 6c. Torque- slip characteristics of single phase induction motors & their applications. 6.1 Double field revolving theory and working principle of single-Phase Induction motor. 6.2 Starting of single phase LM. 6.3 Types of single-phase I. M.: - Split phasing principle and starting of a) Resistance start I. M. b) Capacitor start-run LM. ©) Double value capacitor run induction motor 4) Shaded pole motor. 6.3 Torque- slip characteristics of above single-phase induction motors. 6.4 Applications of above motors. 8. SUGGESTED SPECIFICATION TABLE FORQUESTION PAPER DESIGN- Unit Unit Title ‘Teaching |_Distribution of Theory Marks No. Hours R U A | Total Level | Level | Level | Mark 1_| Three phase Induction Motor. 10 06 | 06 | 04 16 2_| Performance of 3 Phase IM 08 [04 | 0 14 3 _| Induction motor control & Applications 06 = 04 [06 | 10 4__| Three Phase Alternator 10 O_| 4 | 08 16 3_| Three Phase Alternator 08 | 04 | 08 12 6 _| Single Phase Induction Motors 06 | 0% | @ 2 Total a 16 | 28 | 36 [ 30Course Code: EE4105 10. ul. SUGGESTED STUDENT ACTIVITIES Other than the classroom and laboratory learning, following are the suggested student- related co-curricular activities which can be undertaken to rate the attainment of the various outcomes in this course: Students should conduct following activities in group and prepare reports of about 5 pages for each activity, also collect/record physical evidences for their (student's) portfolio which will be useful for their placement interviews: Visit to a) Rewinding shop of three phase induction motor .b) Rewinding shop of single phase induction motor ¢) Alternator manufacturing industry. Prepare journal based on practical performed in Electrical laboratory. Journal consists of drawing, observations, required equipment’s, date of performance with teacher signature. SUGGESTED SPECIAL INSTRUCTIONAL STRATEGIES (if any) These are sample strategies, which the teacher can use to accelerate the attainment of the various outcomes in this course: These are sample strategies, which the teacher can use to accelerate the attainment of the various outcomes in this course: a) Massive open online courses (MOOCs) may be used to teach various topics/sub topics. b) About 15-20% of the topics/sub-topics which is relatively simpler or descriptive in nature is to be given to the students for self-directed learning and assess the development of the COs through classroom presentations (see implementation guideline for details), c) With respect to item No.8, teachers need to ensure to create opportunities and provisions for co-curricular activities, 4) Guide student(s) in undertaking micro-projects. e) Teacher should ask the students to go through instruction and Technical manuals SUGGESTED MICRO-PROJECTS Only one micro-project is planned to be undertaken by a student that needs to be assigned to hinv/her. In the first four semesters, the micro-projects are group-based. However, in the fifth and sixth semesters, it should be preferably be individually undertaken to build up the skill and confidence in every student to become problem solver so that s/he contributes to the projects of the industry. In special situations where groups have to be formed for micro-projects, the number of students in the group should not exceed thre: The micro-project could be industry application based, internet-based, workshop- based, laboratory-based or field-based. Each micro-project should encompass two or more COs which are in fact, an integration of PrOs , UOs and ADOs, Each student will have to maintain dated work diary consisting of individual contribution in the project work and give a seminar presentation of it before submission. The total duration of the micro-project should not be less than 16 (sixteen) student engagementCourse Code: EEA105 hours during the course. The student ought to submit micro-project by the end of the semester to develop the industry-oriented COs. A suggestive list of micro-projects is given here, Similar micro-projects could be added by the concerned faculty(Any one by one batch): a) Prepare document related to rewinding of 3-phase IM. b) Study of soft starters recently used in industries~ case study. ©) Comparative study of all types of domestic appliances where I-phase LM. are used such as: i)ceiling fan, ii) Washing machine, iii)Mixer, iv)Domestic pump, v) Table fan, vi) Air conditioner 12. SUGGESTED LEARNING RESOURCES x Title of Book Author Publication 1 | Electrical Technology Vol.II B.L.Theraja S. Chand Publication, Delhi ISBN 978812192 2 | Control of Electrical Machines Dr. 8S. K. New Age International. Bhattacharya _| ISBN 9788122409970 3 | Performance and Design of M..G. Say CBS Publications Altemating Current Machines ISBN 9788123910277 4 | Principles of Electrical 'V.K. Mehta | S. Chandand Co., New Delhi Machines ISBN: 9788121921916 5 | Electrical Machinery P.S. Bimbhra | Khanna Publications ISBN : 9788174091734 13, SOFTWARE/LEARNING WEBSITES http://electrical-updates. blogspot.com/2019/02/pdf-clectrical-machinery-by-ps-bimbhra.htm! hups://www.academia.edu/8844577/Principles_of Electrical Machines_by_V.K.Mehta hhttps:/www.academia.edu/8844577/Principles_of Electrical Machines by_V.K Mehta htips://www.youtube.com/watch?v=bStcOFFYK60 ‘hutpsi!/www. youtube.com/watch?v=AhxMrUo806Y -ttps://www. youtube.com/watch?v-b89TTwINapYCourse Code: EE4105 14. PO - COMPETENCY- CO MAPPING POI PO? POR PO POS POs POT COL 3 i i 2 i i 3 co2 3 3 2 2 2 1 3 C03 2 2 2 2 2 7 3 Co4 3 2 2 2 2 7 2 COS 2 2 2 2 1 7 3 CO6 2 2 i 2 i i 3 2 2 2 2 ‘Coz 3 3 2 2 C03 2 3 2 2 cod 3 3 2 2 COs 2 2 2 2 COG 2 2 2 2 Sign: Sign Name: 1. Mrs, M, A. Chigteri Name:Dr. S. 8. Bharatkav/Shri, R.U, Shelke 2. Shri S. B. Kale 3. Shri. S. S. Ashtaputre (Head of Department) (Course Experts) i Sign Name: Dr. S. 8, Bharatkar/Shri, RU. Shelke (Program Head ) Name: Shri. A. 8. Zanpure (Department of Electrical Engineering) {CDC Incharge }