What is a circuit?
EMF (voltage) under the path of the currents flowing through the circuit. Usually consists of a power supply, load and switch it into three parts. The magnitude and direction of the current flowing through the circuit the circuit does not change with time, called the DC circuit. The magnitude and direction of the current flowing through the circuit circuit over time, called the AC circuit.
Magnetic circuit is what does that mean?
When you iron core coil, magnetomotive force generated by the magnetic flux, mainly concentrated in the path specified by the core, this path is called the magnetic circuit. By excitation of magnetic circuit of direct current, called the DC magnetic circuit, by the magnetic circuit of the alternating current excitation, called AC magnetic circuit.
Circuit magnetic circuits have a lot in common with the place. In the circuit, current is the electric potential generated, in magnetic circuits, magnetic flux is produced by MMF. In the circuit, current through the resistance will cause a voltage drop, in the magnetic circuit, have a magnetic flux through magnetic resistance pressure drop. In the circuit, use Ohm’s law to represent the relationship between current, resistance and voltage drop, in magnetic circuits, and circuit magnetic circuits similar to Ohm’s law for magnetic flux, the relationship between reluctance and MMF.
However, the circuit and the magnetic circuit is essentially different from, must not be confused. Main difference they sum up a few points:
(1) current representatives charge mobile, which does not represent any particle moving. Magnetic flux through the HIV resistance, unlike the current through the resistor that consume energy, maintaining a constant magnetic flux does not require any child. Therefore, you can have circuit breaker in the circuit, not on the magnetic circuit in the circuit breaker, as long as the presence of magnetomotive force, always gives rise to a corresponding magnetic flux, magnetic flux is continuous.
(2) in a circuit, electrically conductive material conductivity is generally larger than the conductivity of the insulation material of several thousand or more, so the leakage current of the circuit is very small, can be ignored. In the magnetic circuit and the permeability of ferromagnetic materials is generally higher than non-permeability of ferromagnetic materials thousands of times larger or smaller. Therefore, the phenomenon of magnetic flux leakage in magnetic circuit is much more serious than the leakage in the circuit. This makes the calculation of magnetic circuit with large errors, unlike circuit can be calculated more accurately.
(3) in the circuit, when there is no EMF and current is equal to zero. And when no magnetomotive force of magnetic circuit due to hysteresis, always more or less residual magnetism.
(4) due to ferromagnetic materials have magnetic saturation, so the reluctance of the magnetic circuit is nonlinear, and General circuit resistance is linear resistors are not the same. Therefore, the magnetic circuit Ohm’s law generally only used for a qualitative analysis of the magnetic circuit.
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