Humidity can have several significant effects on edgewise wound inductors.
1. Insulation Degradation
Edgewise wound inductors have insulation around the wire windings. High humidity levels can lead to the absorption of moisture by the insulation material. Over time, this can cause the insulation to degrade. For example, in humid conditions, the insulation may become brittle or lose its dielectric strength. When the insulation degrades, it increases the risk of short-circuits between the windings. A short - circuit can drastically change the inductor's electrical properties and may lead to overheating or even complete failure of the inductor.
2. Corrosion of Conductive Materials
The presence of moisture in the air can also cause corrosion of the conductive wire used in the windings. The wire, usually made of copper or other metals, can react with water and oxygen in the air to form oxides. Corrosion can increase the resistance of the wire. According to Ohm's law (), an increase in resistance can lead to more power dissipation in the form of heat when current passes through the inductor. This additional heat can further affect the performance of the inductor and reduce its lifespan.
3. Change in Magnetic Properties
In some cases, humidity-induced changes in the materials of the inductor's core (if it's a moisture-sensitive material) can affect the magnetic permeability. A change in magnetic permeability can alter the inductance value of the inductor. This can lead to a shift in the resonant frequency and other circuit-related parameters if the inductor is part of a tuned circuit, potentially disrupting the overall performance of the electronic system.
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