As we know that a single-phase induction motor is not a self-starting motor. In order to make it self starting, changes are to be done to the construction. Let us see the construction and working principle of the shaded pole indu…
In a dc motor, speed will depend on armature current and field voltage. So to control dc motor speed, field voltage or armature current should be changed. In a dc series motor or universal motor, the speed is indeterminate and i…
The phasor diagram of a synchronous motor is shown below. From the phasor diagram, let, V = Supply voltage/phase I a = Armature current/phase R a = Armature resistance/phase α = Load angle Φ = Power factor angle. Input Power …
We know that in a synchronous generator or alternator when the conductors of the rotor cuts the alternating magnetic flux lines produced by the stator or field winding an EMF will induce in the rotor conductors (according to the …
The performance characteristics of a synchronous motor are obtained by v-curves and inverted v-curves. Synchronous machines have parabolic type characteristics (the graph drawn is in the shape of parabolic). If the excitation i…
Synchronous Condenser or Synchronous Capacitor : If a synchronous motor is on no-load and over-excited (E b > V) then the current drawn by it leads the voltage by nearly 90°. The phasor diagram of the motor at no-load is sh…
A device that converts electrical energy into mechanical energy running at synchronous speed is called Synchronous Motor . Its speed is constant irrespective of load. It is a doubly excited machine because its field winding is ex…
