DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to
under steay state:
P= (E V sinδ)/ X
change in load on motor, δ adjust to new value
rotor oscillate about its final equilibrium load angle called hunting.
sudden change in load
fault in supply system
sudden change in field current
using damper bar
Starting method of 1 phase I.M.
Split phase starting
Shaded pole starting
types of 1 phase I.M.
Resistor split phase motor
capacitor spit phase motor
Resistor split phase motors have poor starting torque
capacitor split phase motor, capacitor connect series with auxiliary winding make angle 90˚ result in optimum starting torque.