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close this bookElectrical Machines - Basic vocational knowledge (Institut für Berufliche Entwicklung, 144 p.)
close this folder2. Basic principles
close this folder2.3. Force action of the magnetic field
View the document2.3.1. Force action on cur rent-carrying conductors
View the document2.3.2. Force action on current-carrying coils (motor principle)

2.3.2. Force action on current-carrying coils (motor principle)

Motor principle

As opposed to Figure 17, Figure 19 features a conductor loop is positioned in a rotatable manner. A force is exerted on both conductor sides. This yields an overall torque.

M = 2 · F · r

Figure 19 - Torque incidence in a conductor loop

1 Radius, 2 Effective length, 3 Current direction, 4 Force action

Motor equation

The following equation is forthcoming from the electrodynamic law of force

M = 2 · B · l · I · N · r

M = c · F · I


machine constants (constructive values)

magnetic flow of the external magnetic field


current in the conductor loop or coil