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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
 

2.1.4. Magnetic field of a current-carrying coil

Magnetic poles

A coil comprises several conductor loops. The overall magnetic field is derived from the magnetic fields of the individual conductors.

A current-carrying coil has both a north and south pole.


Figure 7 - Magnetic field of a current-carrying coil

(1) Magnetic field of a conductor loop
(2) Magnetic field of a coil
1 Slant image
2 Top view as seen from above

Field direction

The magnetic field lines emerge from the north pole and enter the south pole.

If one clamps such a current-carrying coil with one’s right fist so that the bent fingers point in current direction, then the projecting thumb points towards the north pole. (clockhand principle)


Figure 8 - Magnetic field of a coil and clockhand principle

(1) Coil
(2) Clockhand principle
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