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close this bookElectrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages)
View the documentIntroduction
Open this folder and view contents1. General information about electrical machines
close this folder2. Basic principles
Open this folder and view contents2.1. The magnetic field
close this folder2.2. Measurable variables of the magnetic field
View the document2.2.1. Magnetomotive force
View the document2.2.2. Magnetic flow
View the document2.2.3. Magnetic flow density
Open this folder and view contents2.3. Force action of the magnetic field
Open this folder and view contents2.4. Voltage generation through induction
Open this folder and view contents3. Execution of rotating electrical machines
Open this folder and view contents4. Synchronous machines
Open this folder and view contents5. Asynchronous motors
Open this folder and view contents6. Direct current machines
Open this folder and view contents7. Single-phase alternating current motors
Open this folder and view contents8. Transformer

2.2.1. Magnetomotive force

Magnetic fields are caused by electric currents.

Magnetomotive force signifies the existence of a magnetic field if the current flows through a conductor loop.

Figure 15 - Stationary induction

(1) Current-carrying conductor loop
(2) Current-carrying coil
1 Current flow direction

The current “magnetomotives” the enclosed magnetic field lines. The magnetomotive force can be increased if the same current is conducted several times through the field lines (Cp. Fig. 15). This applies for a current-carrying coil with a number of turns equalling N:

Θ = I • N

Formula sign Θ
Unit: (Theta)
[Θ] = 1A

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