Programming instructions

Inductor
 National Instruments Corporation 2-23 Multisim Component Reference Guide
2.8 Inductor
An inductor stores energy in an electromagnetic field created by changes in current through it.
Its ability to oppose a change in current flow is called inductance,
L, and is measured in
Henrys.
An inductor is a coil of wire of one “turn” or more. It reacts to being placed in a changing
magnetic field by developing an “induced” voltage across the turns of the inductance, and will
provide current to a load across the inductance. Voltages can be very large.
Inductors, like capacitors, store energy in magnetic fields. Their “charge” and “discharge”
times make them useful in time-delay circuits.
2.8.1 Characteristic Equation
The voltage across the inductor is equal to the inductance, L, multiplied by the change in
current through the inductor, that is:
2.8.2 DC Model
In the DC model, the inductor is represented by a short circuit.
2.8.3 Time-Domain Model
R
Ln
is an equivalent resistance and i
Ln
is an equivalent current source. The expression for the
R
Ln
and i
Ln
depends on the numerical integration method used.
vL
di
dt
=
ComponentRef.book Page 23 Thursday, December 7, 2006 10:12 AM