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Power Handling and Heat Dissipation

Power Handling and Heat Dissipation

Accelerated life and power testing

  • Input power versus time Displacement versus time Voice coil temperature Durability, endurance, reliability Parameter variation over time (aging)

Voice coil temperature

  • Variation of dc resistance Re versus time Increase of voice coil temperature δTv Heating and cooling curves

Thermal parameter measurements

  • Thermal resistances of voice coil and magnet Thermal capacities of voice coil and magnet Air convection cooling coefficient Eddy current heating factor

Thermal analysis and heat transfer

  • Increase of voice coil temperature δTv Increase of magnet temperature δTm Bypass factor Power Pcoil transferred to coil Power Pcon transferred by convection cooling Power Peg transferred by eddy currents

Voltage and current

  • Rated noise voltage Short term maximum voltage Long term maximum voltage Peak and rms value, crest factor Probability density function

Electrical input power

  • Real input power Preal Power P­Re dissipated on Re Pn nominal impedance Zn Short term maximum input power Long term maximum power