Direct Current Electrical Motor

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This Java applet shows a direct current electrical motor, which is reduced to the most important parts for clearness. Instead of an armature with many windings and iron nucleus there is only a single orthogonal conductor loop; the axis the loop is rotating around was omitted.

The blue arrows indicate the technical current direction (from plus to minus). You can recognize the magnetic field lines (directed from the red painted north pole to the green painted south pole) by the red color. The black arrows represent the Lorentz force which is exerted to a current-carrying conductor in the magnetic field.

The mentioned Lorentz force is orthogonal to the direction of current and to the magnetic field lines. The orientation of this force results from the well-known three finger rule (for the right hand!):

Thumb: Technical current direction
Forefinger: Magnetic field
Middle finger: Lorentz force

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© Walter Fendt, November 29, 1997
Last update: April 23, 1998

Source file (German version):

MMPh (Multimedia Physics)

This applet is part of the Contemporary College Physics Simulation Library.