Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
Solved problems of AC Rotating Machines
Salient Pole Synchronous Motor
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
Various torques associated with a synchronous motor
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
As seen earlier, synchronous motor is not self-starting. It is necessary to rotate the rotor at a speed very near to synchronous speed. This is possible by various method in practice.
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
When a sinusoidal (single-phase) voltage is applied to a winding, the magnetic field produced by the resultant current flow will also be sinusoidally varying with respect to time.
Characteristics, Principle of Operation, Method of Starting
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
Synchronous Machine or Motor is electrically identical with an alternator or ac generator. A given synchronous machine may be used at least theoretically as an alternator, when driven mechanically or as a motor when driven electrically just as in the case of de machines.
AC Rotating Machines
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
The voltage regulation of an alternator is defined as, the increase in terminal voltage when full-load is thrown off, assuming field current and speed remains the same.
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
Derivation of Equation of induced emf
AC Rotating Machines
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
An alternator has 3-phase winding on the stator and a d.c field winding on the rotor.
Types
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
Single phase induction motors are named according to the starting Methods (or) device employed. So based on starting methods, the various types of single phase induction motors are explained
with their Advantages, Disadvantages, Applications
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
The single phase induction motors can be classified according to the phase difference produced between the currents in the main and auxiliary windings. The types are: (1) Split-phase motors (2) Capacitor-start motors (3) Capacitor-start capacitor run motors (4) Shaded-pole motors.
Construction, Working Principle, Double Field Revolving Theory, Characteristics
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
For general lighting purpose in shops, offices, houses, schools etc., Single phase supply is commonly used. There are numerous domestic applications like mixer, automatic washing machine etc.
Methods of speed control | AC Rotating Machines
Subject and UNIT: Electrical and Instrumentation Engineering: Unit III: AC Rotating Machines
Two methods of speed control 1. From stator side 2.From rotor side