ELECTRICAL MACHINES III – Subject Code: 13EE3015 Internal Marks: 30 Credits: 3 External Marks: 70 Objectives: To develop knowledge on Principles & operation, construction, performance, maintenance & testing of Synchronous Machines. Further acquiring knowledge on construction, principle and operation, performance of AC series motors, Repulsion motors, Reluctance motors, Hysteresis motors and Stepper motors. Learning Outcomes: Enable the students to have a fair knowledge about the construction and operation of synchronous machines and special machines. Students will be in a position to test and analyse the performance of these machines. UNIT I – Construction and operation of Alternators Constructional Features of round rotor and salient pole machines Armature windings Integral slot and – – fractional slot windings; Distributed and concentrated windings distribution, pitch and winding factors – – E.M.F Equation. Armature reaction - leakage reactance synchronous reactance and impedance - phasor – diagram load characteristics. – UNIT II – Regulation of Alternator Regulation by synchronous impedance method, M.M.F. method and Z.P.F. methods– salient pole alternators – two reaction analysis of Xd and Xq (Slip test) Phasor diagrams - Regulation of salient pole –determination alternators - Synchronizing the alternators with infinite bus bars. UNIT - III Parallel Operation of Alternators Parallel operation and load sharing - Effect of change of excitation and mechanical power input. UNIT IV – Synchronous Motors Principle of operation phasor diagram Variation of current and power factor with excitation synchronous – – – condenser Mathematical analysis for power developed . Excitation and power circles hunting and its – – suppression Methods of starting. – UNIT V – Single Phase Motors & Special Motors Single phase Motors: Single phase induction motor Constructional features-Double revolving field theory – – Elementary idea of cross-field theory split-phase motors shaded pole motor. – – Principle & performance of A.C. Series motor.
ELECTRICAL MACHINES – III Subject Code: 13EE3015 Internal Marks: 30 Credits: 3 External Marks: 70 Objectives: To develop knowledge on Principles & operation, construction, performance, maintenance & testing of Synchronous Machines. Further acquiring knowledge on construction, principle and operation, performance of AC series motors, Repulsion motors, Reluctance motors, Hysteresis motors and Stepper motors. Learning Outcomes: Enable the students to have a fair knowledge about the construction and operation of synchronous machines and special machines. Students will be in a position to test and analyse the performance of these machines. UNIT – I Construction and operation of Alternators Constructional Features of round rotor and salient pole machines – Armature windings – Integral slot and fractional slot windings; Distributed and concentrated windings – distribution, pitch and winding factors – E.M.F Equation. Armature reaction - leakage reactance – synchronous reactance and impedance - phasor diagram – load characteristics. UNIT – II Regulation of Alternator Regulation by synchronous impedance method, M.M.F. method and Z.P.F. methods– salient pole alternators – two reaction analysis –determination of Xd and Xq (Slip test) Phasor diagrams - Regulation of salient pole alternators - Synchronizing the alternators with infinite bus bars. UNIT - III Parallel Operation of Alternators Parallel operation and load sharing - Effect of change of excitation and mechanical power input. UNIT – IV Synchronous Motors Principle of operation – phasor diagram – Variation of current and power factor with excitation – synchronous condenser – Mathematical analysis for power developed . Excitation and power circles – hunting and its suppression – Methods of starting. UNIT – V Single Phase Motors & Special Motors Single phase Motors: Single phase induction motor – Constructional features-Double revolving field theory – Elementary idea of cross-field theory – split-phase motors – shaded pole motor. Principle & performance of A.C. Series motor.
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