Basis of DC Motor Action. Magnetic Field Tippler.
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Transcript of Basis of DC Motor Action. Magnetic Field Tippler.
Compass on Top of the Wireshows approximate direction of field as the result of current flowing in
the wire
Field Around Current-Carrying Wireschematically showing the direction of the field around the wire for
current flowing in the direction shown in the wire
Opposite Poles Attractso if the center magnet is can rotate around its midpoint, it will tend to
line up with the two fixed magnets
N S
N
S
NS
N
Momentum Causes Overshootso the direction of rotation will be reversed by the magnetic attraction
N S
N
S
NS
N
N
SN S
N S NS
If the direction of the current changes just as the electromagnet passes the fixed magnets, like
poles repel causing the electromagnet to continue rotating.
N SN S
N S
N SN
SS
N
S
The direction of the current can be changed if the ends of the wires brush along the fixed + and – contacts as the electromagnet rotates.
+
_
brushes
rotates
stationary
• Go to motor applet
• http://www.walter-fendt.delph11e/electricmotor.htm