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