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