Motor Drive Architecture
Typical power electronics configuration for motor drive applications
Rectifier Stage
The input rectifier stage converts AC line voltage to DC for the inverter. This stage may be passive (diode bridge), active (IGBT-based), or include power factor correction depending on the application requirements. Semikron offers both standard bridge rectifiers and active front-end solutions.
Inverter Stage
The inverter stage converts DC power to variable frequency AC for motor control. This stage requires precise timing control and fast switching capability for optimal motor performance. The choice of topology (2-level, 3-level) depends on power level and performance requirements.
Key Requirements
- Precise control with fast response to dynamic loads
- High switching frequencies for smooth motor operation
- Robust operation under motor load variations
- Compact design for space-constrained applications
FAE Technical Commentary
Expert insights on motor drive applications
For high-dynamic applications, we recommend SEMiX modules with fast IGBT technology that support switching frequencies up to 16kHz. The low saturation voltage and optimized tail current characteristics provide excellent performance for precise motor control.
When acoustic noise is critical, consider using MiniSKiiP systems with their integrated driver optimization. The matched driver/power module combination minimizes switching oscillations that contribute to audible noise.
For servo applications with high overload requirements, ensure adequate thermal design to handle temporary overcurrent conditions. Semikron's thermal models can help predict junction temperature during these conditions.