What is the magnetization characteristics of DC shunt generator?
DC generator is that curve which gives the relation between field current and the armature terminal voltage on open circuit. is constant for a given machine.it is replaced by K in this equation.
What are magnetization characteristics?
The open circuit characteristics (O.C.C) or magnetization characteristics is the curve that shows the relationship between the generated EMF at no-load (E0) and the field current (If) at constant speed. It is also known as no-load saturation curve.
What is the nature of characteristics of DC shunt generator?
Characteristics of DC Shunt Generator To build up voltage of a shunt generator, the generator is driven at the rated speed by a prime mover. Initial voltage is induced due to residual magnetism in the field poles. The generator builds up its voltage as explained by the O.C.C. curve.
What is the use of magnetization curve of DC shunt generator?
The magnetization curve of a generator shows the relationship, at constant speed between the no-load terminal voltage and the exciting current. This curve is often called an open- circuit characteristics curve or no-load curve. The total induced EMF of the armature: Z = total number of conductors in the armature.
What are the characteristics of DC shunt motor?
Characteristics of a DC Shunt Motor:
- Speed-Armature Current Characteristic:
- Torque-Armature Current Characteristic:
- Speed-Torque Characteristic:
- Break in Field Circuit of a DC Motor:
What is residual magnetism in DC shunt generator?
Residual magnetism is the small magnetic field left in the iron cores of the shunt fields when the generator is at rest. Without it, the fields would have to be flashed with a DC current in order to start the generator generating; Hence to start the generator, it is necessary for the DC shunt generator.
What is the use of magnetization curve?
A magnetization curve (ab) for a ferromagnetic specimen and an associated hysterisis loop (bcdeb). The coercivity of a ferromagnetic material is the intensity of the applied magnetic field required to reduce the magnetization of that material to zero after the magnetization of the sample has been driven to saturation.
What is DC shunt generator?
A shunt generator is a type of electric generator in which field winding and armature winding are connected in parallel, and in which the armature supplies both the load current and the field current for the excitation (generator is therefore self excited).
How the characteristics of DC series motor differs from 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 the magnetization curve effect?
Definition of magnetization curve : a graph representing changes in the condition of a magnetizable substance with magnetizing force H as abscissa and either magnetization I or induction B as ordinate.
What is meant by residual magnetism?
Definition of residual magnetism : magnetization remaining in a magnetized body no longer under external magnetic influence : the magnetism of a permanent magnet.
What is internal characteristics of DC generator?
The internal characteristics of a DC series generator is the graph plotted between generated EMF (E) on-load and the armature current. Because of the effect of armature reaction, the magnetic flux on-load will be less than the flux at no-load.
Why the external characteristics of a DC shunt generator is more drooping than that of a separately excited generator?
The DC shunt generator has drooping characteristics because the terminal voltage decreases as the load current increases.
What is called magnetization?
Magnetization is the density of magnetic dipole moments that are induced in a magnetic material when it is placed near a magnet.
What is the characteristic of DC shunt field winding?
The shunt (field) windings of a DC shunt motor are made of smaller gauge wire, but they have many more turns than a series-wound DC motor. The high number of turns allows a strong magnetic field to be generated, but the smaller gauge wires provide a high resistance and limit the current flowing through the shunt coil.
What is the characteristic of a DC shunt motor?
Characteristics of DC Shunt Motor The shunt motors are the constant flux machines i.e. their magnetic flux remains constant because their field winding is directly connected across the supply voltage which is assumed to be constant.
What is magnetization formula?
The magnetization of a material may be defined as the net magnetic moment per unit volume of the material. Formula : MZ =VM. SI unit : =A/m. (Ampere per meter)
What is residual magnetism in DC generator?