Physical Characteristics of Inductors

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Presentation transcript:

Physical Characteristics of Inductors ECE 201 Circuit Theory I

L = Inductance in Henrys (H) N = the number of turns μ = permeability in Henrys/meter (H/m) A = cross-sectional area in meters (m) ECE 201 Circuit Theory I

Winding Resistance, RW The resistance of the wire used to make the coil (winding). Most of the time assumed negligible. ECE 201 Circuit Theory I

Winding Capacitance, CW Stray capacitance due to two conductors placed side – by – side. ECE 201 Circuit Theory I

Faraday’s Law Moving a magnet through a coil of wire induces a voltage across the coil. When a complete path is provided, the induced voltage causes an induced current. The amount of induced voltage in a coil is directly proportional to the rate of change of the magnetic field with respect to the coil. ECE 201 Circuit Theory I

Inducing a Voltage by Moving a Magnet ECE 201 Circuit Theory I

The induced voltage is proportional to the number of turns, N, of the wire and the rate of change of the magnetic flux. ECE 201 Circuit Theory I

Types of Inductors ECE 201 Circuit Theory I