Separately Excited Dc Generator Schematic Diagram

The flux produced by the poles depends upon the field current with the unsaturated region of magnetic material of the poles.

Separately excited dc generator schematic diagram. The generated voltage is described by eq. These are generators in which the field winding is excited by the output of the generator itself. For that we run the dc generator with its rated speed and also we excite the field with the rated field current. External characteristics of separately excited dc generator.

A compound dc generator is used to provide the power supply for dc welding machines. The series dc generator is used in arc lamps for lighting stable current generator and booster. A schematic diagram of a separately excited dc generator looks identical to figure 8 a but the armature current i a is reversed. In a separately excited dc generator a separate source of dc power is connected to the field winding.

As described before there are three types of self excited dc generators they are 1 series 2 shunt and 3 compound. As described before there are three types of self excited dc generators they are 1 series 2 shunt and 3 compound. The self excited dc generator or shunt dc generator is used for power as well as ordinary lighting using the regulator. Separately excited dc generators are rarely used in practice.

It can be used for battery lighting. Here first we keep the dc generator at its no load condition. The circuit diagram of a separately excited dc generator on loaded condition is shown below. I a armature current.

As the source of the field magnet is separate and it does not have any connection with the armature circuit of the generator we refer it as a separately excited dc. Self excited dc generator. These are the generators whose field magnets are energized by some external dc source such as a battery. Now we will draw the external characteristics of a separately excited dc generators.

This source can be a battery a diode rectifier another dc generator or a controlled rectifier. Separately excited dc generator here instead of using a permanent magnet we use an electromagnet excited from an external source for the required magnetic field of the generator. A circuit diagram of separately excited dc generator is shown in the figure below. As with the dc motor the shaft torque of the dc generator is countered by a force created at the stator mounting point.

There are generally three most important characteristic of dc generator. Magnetic or open circuit characteristic of separately excited dc generator the curve which gives the relation between field current if and the generated voltage. A dc generator whose field winding or coil is energised by a separate or external dc source is called a separately excited dc generator. Characteristic of separately excited dc generator.

A series dc generator is shown below in fig a in which the armature winding is connected in series with the field winding so that the. Flux is directly proportional to the field current. These are generators in which the field winding is excited by the output of the generator itself.