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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
close this folder2.1. The magnetic field
View the document2.1.1. Definition and presentation of the magnetic field
View the document2.1.2. Magnets Magnetic field
View the document2.1.3. Magnetic field of a current-carrying conductor
View the document2.1.4. Magnetic field of a current-carrying coil
View the document2.1.5. Magnetic fields in electrical machines
Open this folder and view contents2.2. Measurable variables of the magnetic field
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
 

2.1.3. Magnetic field of a current-carrying conductor

Presentation of the magnetic field

Figure 5 presents the magnetic field of a current-carrying conductor.


Figure 5 - Magnetic field of a current-carrying conductor.

1 Current flow direction

Stipulations for current presentation

- Where the current flows away from the viewer, that is to say into the paper plane, a cross is indicated in the conductor cross-section.

- Where the current flows towards the viewer, that is to say out of the paper plane, a dot is entered into the conductor cross-section.


Figure 6 - Current direction designation in the plane of field lines

Direction of field lines

As Figure 6 indicates the direction of the magnetic field lines depends on the current direction. If one views the conductor cross-section in current direction, then the field lines appear clockwise.

If one clamps such a current-carrying conductor with one’s fist so that the projecting thumb points in current direction, then the bent fingers indicate the direction of the field lines.
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