What is the resistance of field winding?

Typically the field resistance of a shunt generator or motor will be relatively high (10 X ohm’s). The armature resistance will be low (perhaps a few ohm’s or less).

What is difference between DC series motor and DC shunt motor?

A series motor respond by decreasing its speed with small increase in current for a given load torque. A shunt motor holds its speed nearly constant with large increase in input current for same amount of load torque.

What is field resistance of DC motor?

Critical field resistance is a term that is associated with a shunt DC generator. In a DC shunt generator, the voltage induced across the armature, Va, is directly proportional to the flux acting across it, The flux in a DC generator is directly proportional to the field current, If.

What is the resistance of the field winding of a DC shunt generator kept low?

What is the resistance of the field winding of a d.c. shunt generator kept low? If the field resistance of a d.c. generator is more than particular value ( critical resistance), The generator will fail to build up the voltage. For this reason, the field resistance of a d.c. shunt generator is kept low.

What is shunt field resistance?

Critical Field Resistance of DC Shunt Generator The critical field resistance (RC) of a DC shunt generator is defined as the maximum field circuit resistance with which the shunt generator would just excite. As the resistance of the field circuit is increased, the slope of the field resistance line also increases.

How the critical field resistance of a DC shunt generator is estimated from its OCC?

This point is intersection of field resistance line with the open circuit characteristics (O.C.C.). The voltage corresponding to point A is the maximum voltage it can generate. This value of field resistance is called critical resistance denoted as RC, of the shunt field circuit at given speed.

Which winding have higher resistance series or shunt?

Series windings carry more current and should allow compratively less voltage drop. That’s why it is so. Shunt windings are connected between line and neutral and an effective resistance is required such that the field doesn’t acts as short circuited path. Furthermore, it also reduces power loss in form of heat.

What is shunt field and Series field?

With a DC compound motor, the majority of the field is wound for a shunt field but with a few turns of series winding on top. The shunt is connected across the field supply and the series turns are connected in series with the armature. This provides a motor with a combination of the shunt and series characteristics.