Invention Reference Number
Oak Ridge National Laboratory has developed an advanced motor drive system that addresses two major challenges in multi-phase motor drives with active neutral point clamped (ANPC) inverters: excess common-mode voltage and neutral point current imbalance. By reconfiguring the way dual inverters interact with motor windings, this approach cancels both undesirable effects at the system level. The result is improved reliability, reduced stress on critical components, and extended equipment lifetime. This innovation is especially valuable in high-performance applications where power quality, efficiency, and durability are key concerns.
Description
In multi-phase motor drives with active neutral point clamped (ANPC) inverters, common-mode voltage and neutral point current imbalance can lead to electromagnetic interference, capacitor stress, and shortened component lifetimes. Conventional methods often rely on complex control schemes or additional hardware, which add cost, size, and inefficiency. ORNL’s inverse segmented drive introduces a system-level solution that eliminates these issues without relying on bulky add-ons. The technique uses a dual-inverter configuration with a unique arrangement that inherently cancels the unwanted electrical effects. Simulation studies show significant reductions in voltage fluctuation and capacitor current stress compared to conventional segmented motor drives. This streamlined design not only reduces the risk of failure but also enables more compact, efficient, and cost-effective motor systems. By improving the stability of multi-phase inverter operation, this technology supports advancements in electric transportation, aerospace systems, and other industries where performance and reliability are critical.
Benefits
- Reduces voltage imbalance and electrical stress on capacitors
- Minimizes electromagnetic interference at the system level
- Improves lifetime and reliability of motor drive components
Applications and Industries
- Electric and hybrid vehicles
- Aerospace propulsion systems
- Industrial multi-phase drive systems
Contact
To learn more about this technology, email partnerships@ornl.gov or call 865-574-1051.
