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<blockquote data-quote="helotaxi" data-source="post: 4925808" data-attributes="member: 550915"><p>Care to explain what the movement has to do with coil heating? 100% of the coil heating has to do with the fact that only a very tiny amount of the current going through the coil creates any motion. All the rest is simply heating the coil. The movement of the coil creates air circulation around the coil and actually cools it.</p><p></p><p>In high power applications, coil heating can have a huge impact on the driver impedance. There are two parts to driver impedance, the resistance portion and the frequency variable portion based on the coil inductance and the movement of the coil in the magnetic gap. At certain freqs the resistance of the driver will make up the bulk of the driver impedance (right at resonance in a ported enclosure is a perfect example). At this freq, resistance rise due to coil heating is a big factor.</p></blockquote><p></p>
[QUOTE="helotaxi, post: 4925808, member: 550915"] Care to explain what the movement has to do with coil heating? 100% of the coil heating has to do with the fact that only a very tiny amount of the current going through the coil creates any motion. All the rest is simply heating the coil. The movement of the coil creates air circulation around the coil and actually cools it. In high power applications, coil heating can have a huge impact on the driver impedance. There are two parts to driver impedance, the resistance portion and the frequency variable portion based on the coil inductance and the movement of the coil in the magnetic gap. At certain freqs the resistance of the driver will make up the bulk of the driver impedance (right at resonance in a ported enclosure is a perfect example). At this freq, resistance rise due to coil heating is a big factor. [/QUOTE]
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