Electrical Power Systems Technology

352 Electrical Power Systems Technology

Sample Problem: Force Acting on a Conductor
When a current-carrying conductor is contained within a magnetic
field, the force produced is called Lorentz force. This force is basic to the
operation of electric motors. The force is greatest when the conductor is
perpendicular to the magnetic field, and minimum (0) when it is parallel.
The maximum Lorentz force is expressed as:

F = B × l × l

Figure 14-2.
Illustration of the ba-
sic motor principle:
(A) Condition with
no current flowing
through the conduc-
tors, (B) Condition
with current flowing
through the conduc-
tors, (e) Direction of
current flow through
the conductors deter-
mines the direction
of the magnetic field
around the conduc-
tors