IXYS Motor Drive Solution

IGBTs and MOSFETs have different optimal operating ranges for motor drives: (1) IGBTs - best for applications above 300V and 20A, lower conduction losses at high currents, typical switching frequency 2-15kHz

(2) MOSFETs - best for applications below 300V or requiring high switching frequencies (>20kHz), lower switching losses, simpler gate drive. For 230V single-phase drives up to 3kW, MOSFETs are often preferred. For 480V three-phase drives above 5kW, IGBTs are typically more efficient. IXYS offers both technologies to optimize for your specific application.

Choose IGBTs for high-voltage high-power; MOSFETs for low-voltage or high-frequency applications.

Motor drive switching frequency selection involves trade-offs: (1) 2-4kHz - lowest switching losses, audible noise may be issue, typical for high-power drives >50kW

(2) 4-8kHz - good balance of losses and noise, most common for industrial drives 5-50kW

(3) 8-16kHz - reduces audible noise and motor current ripple, higher switching losses, typical for servo drives

(4) 16-20kHz - above audible range, highest switching losses, for sensitive applications. Higher frequencies require better thermal management. IXYS devices are characterized across this frequency range.

4-8kHz is typical for general industrial drives; higher frequencies for servo or noise-sensitive applications.

Motor drive protection strategies: (1) Overcurrent protection - use desaturation detection for IGBTs, current sensing for MOSFETs

(2) Short circuit protection - fast detection (<10µs) and soft shutdown to prevent damage

(3) Overtemperature protection - monitor heatsink or device temperature

(4) Overvoltage protection - use snubbers or active clamping for voltage spikes

(5) Gate drive protection - undervoltage lockout and negative gate voltage. IXYS devices feature robust avalanche capability, providing additional protection against voltage transients. Implement multiple protection levels for reliable operation.

Implement comprehensive protection including overcurrent, short circuit, and thermal protection.

Motor drive IGBT thermal management: (1) Heatsink sizing - calculate based on total losses (conduction + switching) and maximum junction temperature

(2) Thermal interface - use high-quality thermal pads or grease with <0.5°C·cm²/W thermal resistance

(3) Airflow - forced air cooling typically required for drives >5kW

(4) Thermal simulation - use software to verify temperatures under worst-case conditions

(5) Monitoring - implement temperature sensors for protection and fan control. Example: 15kW drive with 200W losses requires heatsink with Rth < 0.5°C/W with forced air. IXYS provides thermal models for simulation.

Size heatsink for worst-case losses with adequate margin; use forced air for drives above 5kW.

Yes, IXYS power semiconductors handle regenerative braking in motor drives: (1) IGBT modules - include fast recovery freewheeling diodes for brake chopper circuits

(2) MOSFETs - body diodes can conduct brake current, or add external diodes for higher currents

(3) Brake chopper - use IGBT or MOSFET to dissipate regenerative energy in resistor

(4) Active front end - use IGBT modules for regenerative drives feeding energy back to line. For high-inertia loads or frequent braking, size devices for brake current (often 150-200% of motor current). IXYS devices feature robust reverse bias safe operating area (RBSOA) for reliable braking operation.

IXYS devices support regenerative braking; size for brake current requirements.