Teaser text

A five-phase, three-level pulse-width modulated voltage source inverter and associated modulation techniques for multi-phase machine drives. The inverter employs a coupled inductor in each phase-leg to provide three-level output voltages but only uses two switches per leg.

Body Text

Competitive advantage

  • Compared with the popular three-level neutral-point clamped inverter, the coupled inductor inverter uses fewer switching devices, has no dead-time and associated distortion, and the voltage on the DC-link capacitor does not need to be balanced
  • Vast experience at the assessment and design of space vector modulation strategies
  • Invention and modification of two carrier-based pulse-width modulation techniques to reduce the common-mode voltage for multiphase inverters


  • The establishment of mathematical models of the coupled inductors, total inverter current and current stress on the DC-link capacitors, provides an insight into the way coupled inductors on the system impact on system efficiency and current stress in the DC-link capacitors.

Capabilities and facilities

  • Electrical machine design experience
  • Multi-phase machine design techniques
  • Multi-phase drives and controls
  • Low-speed, high-torque load machines and high-speed load machines

Our partners

  • Shandong BOFA Power Machinery
  • Motorica