Industrial Motor Drive Solution

For a 100kW VFD, we recommend a standard two-level voltage source inverter using GD100HFL120C2S IGBT modules: (1) Input rectifier: Three-phase diode bridge using GDR200A12 for cost-effective AC-DC conversion. (2) DC link: Film capacitors with 1100V rating, sized for 5% voltage ripple at full load. (3) Inverter bridge: 6x GD100HFL120C2S (2 per phase) in standard three-phase bridge configuration. (4) Brake chopper: GD50HFL120C1S with braking resistor for dynamic braking. (5) Control: Vector control with 4-8kHz switching frequency. This topology offers best cost-performance ratio for general-purpose VFD. Alternative: Use active front-end (AFE) for regenerative applications or when input power factor correction is required.

Contact our FAE team for VFD topology selection and motor control design.

IGBT module selection for motor drives involves several factors: (1) Voltage rating: 1200V modules for 380-480VAC motors provide adequate margin. (2) Current rating: Size for 150% overload for 60 seconds. Formula: I_module > I_motor_rms × 1.5 / √2. Example: 100kW motor at 400V, 180A rated → select 300A+ module. (3) Switching frequency: Higher frequency requires modules with lower switching losses. (4) Package selection: 34mm for <30kW, 62mm for 30-100kW, EconoDUAL for >100kW. (5) Thermal performance: Verify RthJC and calculate Tj for worst-case conditions. (6) Short-circuit rating: Ensure 10μs withstand for reliable protection. Starpower provides selection guides and thermal simulation support.

Contact our FAE team for module selection and thermal verification.

Gate drive design for motor drive IGBT modules: (1) Voltage: +15V turn-on, -8V turn-off for best performance and noise immunity. (2) Gate resistance: 15-33Ω for turn-on, 10-22Ω for turn-off to control dv/dt and EMI. Lower values for faster switching (servo), higher for lower EMI (VFD). (3) Peak current: 2-4A for 50A modules, 4-6A for 100A modules, 10-15A for 600A modules. (4) Isolation: Use isolated gate drivers with >2.5kV isolation (e.g., 2ED020I12-FI). (5) Protection: Implement desaturation detection for short-circuit protection with <10μs response. (6) Layout: Minimize gate loop inductance with proper PCB design. (7) Active Miller clamp: Recommended for high dv/dt immunity. Starpower provides reference gate drive circuits optimized for their modules.

Contact our FAE team for gate drive circuit design and component recommendations.

Thermal design for motor drive IGBT modules: (1) Loss calculation: P_loss = P_conduction + P_switching. Conduction loss = I_rms² × Rds(on) or Vce(sat) × I_avg. Switching loss = (Eon + Eoff) × f_sw. (2) Heatsink selection: Target RthSA based on Tj_max, Ta_max, and P_loss. Formula: RthSA < (Tj_max - Ta_max)/P_loss - RthJC - RthCS. (3) For 100kW drive with GD100HFL120C2S: P_loss ≈ 150W per module, RthJC = 0.35K/W. For Tj_max = 125°C, Ta = 40°C: RthSA < (125-40)/150 - 0.35 - 0.1 = 0.12K/W. (4) Cooling: Forced air with 200-400CFM for medium power

liquid cooling for high power (>100kW). (5) Thermal interface: Use phase-change material or high-performance grease with 0.1-0.2K·cm²/W. (6) Temperature monitoring: Use module NTC for over-temperature protection at 100°C.

Contact our FAE team for thermal simulation and cooling system design.

This solution includes a complete BOM with carefully selected power modules and components, thermal design guidelines, and application documentation.

Contact BeiLuo FAE team for personalized assistance.