Contents
Why are inductors designed to vary with time?
If an inductor is designed so that any one of these factors may be varied at will, its inductance will correspondingly vary. Variable inductors are usually made by providing a way to vary the number of wire turns in use at any given time, or by varying the core material (a sliding core that can be moved in and out of the coil).
What are the four factors that affect inductance?
There are four basic factors of inductor construction determining the amount of inductance created. These factors all dictate inductance by affecting how much magnetic field flux will develop for a given amount of magnetic field force (current through the inductor’s wire coil): Number of Wire Wraps, or “Turns” in the Coil
How to measure the inductance of an unknown inductor?
A Simple Method to Measure Unknown Inductors A Simple Method to Measure Unknown Inductors A simple and quick way to measure the inductance of an unknown power inductor (provided you have a function generator and oscilloscope). Ronald Dekker
How to calculate the resistance of an inductor?
Figure 3.1 The “circuit diagram” The exact ratio between the internal generator voltage and the voltage measured by the scope can be calculated with a bit of straightforward network theory: In this formula L represent the inductance, R the resistance (50 ohm), and omega the radial frequency ( = 2*pi*f with f in Hz).
How to determine the inductance of a wire?
Must obtain specified inductance L. We know that the inductance is This is constraint #2. The turns ratio n, core area Ac, and air gap length lgare unknown. L=n 2 R g = µ 0 A cn2 l g Fundamentals of Power Electronics Chapter 14: Inductor design6 14.1.3 Constraint: winding area core window areaW A wire bare area A W core
How does the number of turns affect inductance?
Number of Wire Wraps, or “Turns” in the Coil. All other factors being equal, a greater number of turns of wire in the coil results in greater inductance; fewer turns of wire in the coil results in less inductance.
What is the fill factor of an inductor?
A wire bare area A W core Wire must fit through core window (i.e., hole in center of core) nA W Total area of copper in window: K u W A Area available for winding conductors: Third design constraint: K u W A≥nA W Fundamentals of Power Electronics Chapter 14: Inductor design7 The window utilization factor Ku also called the “fill factor”