magnetomotive force , mmf (skrót)

The magnetomotive force can often be quickly calculated using Ampère's law.

The gilbert, a unit of magnetomotive force or magnetic potential, was named in his honor.

The unit of measure of magnetomotive force is called the gilbert, in his honor.

For example, the magnetomotive force of long coil is:

The equivalent to voltage V is the magnetomotive Force F

Gilbert (unit), a measurement of magnetomotive force

Magnetomotive force

The magnetomotive force in an inductor or electromagnet consisting of a coil of wire is given by:

In analogy to the definition of EMF, the magnetomotive force around a closed loop is defined as:

and represent the magnetomotive force (complex effective amplitude)

("F") is the magnetomotive force (MMF) in ampere-turns

For a closed magnetic circuit (no air gap) most core materials saturate at a magnetomotive force of roughly 800 ampere-turns per meter of flux path.

The magnetomotive force in a PM (caused by orbiting electrons with aligned spin) is generally much higher than what is possible in a copper coil.

Because oersteds are used to measure magnetizing field strength, they are also related to the magnetomotive force (mmf) of current in a single-winding wire-loop:

Magnetomotive force is so named because it plays a role in magnetic circuits analogous to that of electromotive force (voltage) in electric circuits.

The magnetomotive force (MMF) of this current acts on the non-excited poles, creating a working flux (Φ) and the output voltage.

Ampere-turn (symbol), an International System of Units (MKS) unit of magnetomotive force

The total reluctance is equal to the ratio of the "magnetomotive force" (MMF) in a passive magnetic circuit to the magnetic flux in this circuit.

However, if the magnetomotive force is well above saturation, so the core material is in saturation, the magnetic field won't vary much with changes in 'NI' anyway.

The CGS unit of magnetomotive force is the Gilbert (Gi), established by the IEC in 1930 [1].

It can be seen that the magnetomotive force plays a role in this equation analogous to the voltage V in Ohm's law: V = IR.

The notion of "magnetic resistance" was first mentioned by James Joule and the term "magnetomotive force" (MMF) was first named by Bosanquet.

Between the CGS unit and SI unit, the MKS unit magnetomotive force was the Ampere-turn AT.

using Hopkinson's law (magnetic circuit analogue of Ohm's law for electric circuits) and the definition of magnetomotive force (magnetic analogue of electromotive force):

The unit of magnetomotive force is the ampere-turn (At), represented by a steady, direct electric current of one ampere flowing in a single-turn loop of electrically conducting material in a vacuum.