Dynamically, Statically
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
Depending upon the nature of methods, the induced e.m.f. is classified as, 1) Dynamically induced e.m.f. and 2) Statically induced e.m.f
First and Second Law with Solved Example Problems
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
From the experiment discussed above, Michael Faraday a British scientist stated two laws of electromagnetic induction.
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
Key Point : The galvanometer deflects in one direction, when magnet is moved towards a coil. It deflects in other direction, when moved away from the coil.
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
Uptill now we have discussed the basic properties, concepts of magnetism and magnetic circuits. Similarly we have studied, the magnetic effects of an electric current.
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
According to the molecular theory of magnetism groups of molecules acts like elementary magnets, which are magnetized to saturation. This magnetism is developed because of the magnetic effect of electron spins, which are known as 'domains'.
Characteristics and Hysteresis Loop
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
The magnetic materials are classified based on the presence of magnetic dipole moments in the materials.
Experimental Set up, Steps, Graph, Theory
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
Instead of plotting B-H curve only for increase in current if plotted for one complete cycle of magnetization (increase in current) and demagnetization (decrease in current) then it is called hysteresis curve or hysteresis loop.
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
Key Point : The graph between the flux density (B) and the magnetic field strength (H) for the magnetic material is called as its magnetization curve or B-H curve.
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
Stacking factor =Net cross - sectional area occupied by magnetic material/Gross cross-sectional area
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
Similarities between electric and magnetic circuits are listed below :
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
The magnetic circuit can be defined as, the closed path traced by the magnetic lines of force i.e. flux. Such a magnetic circuit is associated with different magnetic quantities as m.m.f., flux reluctance, permeability etc.
Definition, Concept, Formula, Unit
Subject and UNIT: Electrical Machines: Unit I: a. Magnetic Circuits and Electromagnetism
In an electric circuit, current flow is opposed by the resistance of the material, similarly there is opposition by the material to the flow of flux which is called reluctance