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Is residual flux necessary in separately excited generators?
Residual flux is not strictly necessary for separately excited generators to operate, but it is often beneficial. It provides an initial magnetic field that helps establish the output voltage when the generator is started. Without residual flux, the generator may require additional time or an external source to build up the magnetic field and achieve stable operation. Overall, while not essential, residual flux aids in the generator's performance and efficiency during startup.
How initially voltage build up in an alternator by residual magnetism?
The residual flux will help the phenomenon of changing flux. So that emf generation takes place.
What is revolving flux?
Revolving flux refers to the magnetic flux that changes direction and magnitude over time, typically in the context of alternating current (AC) systems or rotating machinery. It is generated by rotating magnetic fields, such as those produced in synchronous motors or generators. This changing flux induces electromotive force (EMF) in conductors, enabling energy conversion and transmission in various electrical devices. Understanding revolving flux is crucial for designing efficient electrical systems and machines.
What do you mean by residual magnetism in DC shunt generators?
The magnetic field that remains in a magnetic material ( a winding core) after the removal of electric power or the magnetizing force.
What is pole flux?
Pole flux refers to the magnetic flux produced by the poles of a magnet, typically in the context of electric machines like generators and motors. It represents the total magnetic field lines that pass through a given area at the magnetic poles, influencing the machine's performance and efficiency. In electric machines, managing pole flux is essential for optimizing torque and power output. The concept is closely related to the design and operation of the magnetic circuit within these devices.
Is residual flux necessary in separately excited generators?
Residual flux is not strictly necessary for separately excited generators to operate, but it is often beneficial. It provides an initial magnetic field that helps establish the output voltage when the generator is started. Without residual flux, the generator may require additional time or an external source to build up the magnetic field and achieve stable operation. Overall, while not essential, residual flux aids in the generator's performance and efficiency during startup.
How initially voltage build up in an alternator by residual magnetism?
The residual flux will help the phenomenon of changing flux. So that emf generation takes place.
What is the importance of residual flux?
Residual flux refers to the magnetic field remaining in a material after the removal of an external magnetic field. It is important in applications like transformers and electric motors, as it helps maintain the efficiency of these devices by ensuring continuous magnetic coupling. Residual flux also affects the hysteresis loop of a material, influencing its magnetic properties.
The flux density that remains when the magnetizing force is removed is called?
residual magnetism
What is residualmagnetism?
The retained magnetic flux of the material, even after the removal of the external magnetizing force is known as residual magnetism.
What is flux residue?
When large magnetomotive force is applied to the core and then removed. The flux in the core doesn't reach zero. Instead, a magnetic field is left behind in the core. This magnetic field is called residual flux in the core. MOHSIN BB-EE-NED
Why an input voltage exists for the motor started to move?
because of the residual magnetic flux that exists in the motor initially due to the poles
Why is residual magnetism is necessary?
'Residual magnetism' isn't something that's 'necessary'; rather, it's something you're stuck with, whether you want it or not! Residual magnetism is due to a phenomenon called 'hysteresis', which is derived from a Greek word, meaning 'to lag'.A bit of background first. If we were to wind an insulated coil around the sample of ferromagnetic material, and pass a current through that wire, we would create and apply magnetic field strength (symbol: H), expressed in amperes per metre, to that sample. This results in a magnetic field being set up within the sample, the intensity of which we call its flux density (symbol: B) expressed in teslas.If we gradually increase the magnetic field strength, the resulting flux density would also increase until a point, called 'saturation' is reached -at this point any further increase in magnetic field strength will NOT increase the flux density. If we were to graph this behaviour, then the result would look something like an elongated 'S', rather than a straight line. This graph is known as a B-H curve.Now, if we were to reduce the magnetic field strength to zero, the magnetic flux density would also reduce towards zero (following a slightly-different curve) but would not reach zero when the magnetic field strength reaches zero -in other words, when we remove the magnetic field strength, the sample 'retains' some flux density -and we call this 'residual magnetism' or, more accurately, 'residual flux density' or 'remanance'. This is what we mean by 'hysteresis' -i.e. changes in magnetic flux density lag behind changes in magnetic field strength.To remove this residual flux density, we would actually need to reverse the direction of the magnetic field strength (by reversing the direction of the current through the coil) until the flux density falls to zero.Different ferromagnetic materials have different values of residual flux density. For example materials that make good permanent magnets have very high values of residual flux density while others, such as metals used to make transformers, electromagnets, etc., have very low values of residual flux density.To summarise, residual magnetism is something that occurs naturally and the amount of residual magnetism depends on the type of magnetic material involved. It's not a matter of being 'necessary', it's simply a characteristic of ALL magnetic materials.
Why an input voltage exists for the motor just started to move?
because of the residual magnetic flux that exists in the motor initially due to the poles
What is revolving flux?
Revolving flux refers to the magnetic flux that changes direction and magnitude over time, typically in the context of alternating current (AC) systems or rotating machinery. It is generated by rotating magnetic fields, such as those produced in synchronous motors or generators. This changing flux induces electromotive force (EMF) in conductors, enabling energy conversion and transmission in various electrical devices. Understanding revolving flux is crucial for designing efficient electrical systems and machines.
What do you mean by residual magnetism in DC shunt generators?
The magnetic field that remains in a magnetic material ( a winding core) after the removal of electric power or the magnetizing force.
What is the significance of the magnetic flux through a loop in the context of electromagnetic induction?
The magnetic flux through a loop is important in electromagnetic induction because it determines the amount of induced electromotive force (emf) in the loop. When there is a change in magnetic flux through the loop, it induces an emf, which can generate an electric current. This phenomenon is the basis for many electrical devices and technologies, such as generators and transformers.
