NTU Motor Lab

Motor Design

High Power Density Axial-Flux Permanent Magnet Motor for eVTOL Propulsion System

  • Developed an axial-flux permanent magnet motor integrated with propellers, achieving a high power density.
  • Achieved ultra-high efficiency with air cooling through optimized electromagnetic and cooling ventilation duct structure design.
  • Enhanced motor reliability through robust structural design and thermal management strategies.
  • Completed hover tests of the eVTOL system, with all motors operating reliably and meeting performance expectations.
  • The eVTOL was invited for the exhibition at the 2026 Singapore Airshow, demonstrating its technological advancement and industry recognition.

An Efficient Axial-Flux Motor with High-Torque Density at Low RPM

  • Developed a 71-kW axial-flux PM motor and successfully implemented it in an e-bike.
  • Achieved power density of 3.8 kW/kg, maximum torque of 267 Nm and torque density of 53.7 Nm/L.
  • Achieved 1.4X higher output torque compared to Zero Motorcycles (US brand)

A high-performance rotary-linear electric machine on robotic application

  • Develop rotary-linear electric motors with high force/torque features
  • Mitigate the end-effect of the unbalanced three-phased system in linear part and achieve totally decoupled magnetic fields for rotary and linear motions
  • Provide stable operation environment with low force/torque ripple

Parallel-Hybrid-Excited Machine with Harmonic-Differential Effect

  • Parallel magnetic path with single-airgap structure
  • Harmonic-differential effect for flux weakening
  • Extended speed range with flux weakening

Parallel-Hybrid-Excited Machine with Harmonic-Shift Structure

  • Simple structure with single air gap and parallel magnetic path
  • Harmonic-shift feature for flux regulation
  • More attractive flux regulation ability

Double-Rotor FSPM Motor with Magnetic Differential

  • Capability of magnetic differential for vehicle steering
  • Magnetic coupling winding for differential action
  • High reliability, high efficiency, and high compactness

Fault tolerant – High-power density machine for aerospace applications

  • Develop high speed high power density machine for aerospace application
  • Enhance fault tolerant capability to handle machine and winding failure during operation
  • Improve mechanical strength and cooling capability to operate under harsh environment

Integrated Power Electronics Motor for Aerospace Application

  • Selection of motor and power converter topology
  • Thermal management of integrated power electronics motor system
  • Solution to EMI issue of motor and power converters

Development of electric motors with direct-drive features for automated ground vehicles

  • Develop high-performance electric motors with direct-drive features
  • Solve the asymmetrical magnetic circuit issue of magnetic-geared machines
  • Improve flux modulation effect, torque density and power factor

Motor Control

A universal Xcube based on TMS320F28377d (Dual core)

  • Universal powerful controller named after Xcube
  • Can generate up to 24 channel analog input with 16 bits and 8 channel analog output with 12 bit
  • Can be extended to add FPGA or ARM part at the top of the board and receive different types of encoders and resolvers

200kW Electrical aircraft controller based on SiC power module

  • The power converter and controller are designed to control a permanent magnet synchronous machine for an electric propeller-driven aircrafts application with four seaters
  • The drive system is capable to generate up to 800 V and 250 A outputs
  • The mass and volumetric density of the controller can reach up to 30kVA/kg and 25kVA/L

Development of Advanced Control Strategies for High-performance Servo Drive System

  • Develop advanced control strategies for high-performance servo drive system where good tracking performance, nice disturbance rejection property, and strong robustness to parameter uncertainties are all required
  • Suppression of torque/current harmonics and enhances the system robustness to disturbances
  • Improve the system adaptiveness to parameter variations

Functional Materials & Advanced Manufacturing Techniques

Additive Manufacturing of Magnetic Materials & Conductive Materials

  • High-performance magnetic materials: Advanced additive manufacturing, powder compaction, and post-processing to precisely engineer microstructure, delivering low-loss soft magnetic materials and high-coercivity, thermally stable permanent magnets for next-generation electrical machines, power electronics, and energy systems.
  • High-conductivity solutions: Development of advanced conductive materials and hybrid architectures, including graphene- and carbon nanotube-enhanced systems, to minimise electrical losses and maximise current-carrying efficiency in power, aerospace, and grid applications.
  • End-to-end manufacturing capability: Integrated workflow covering additive manufacturing process optimisation, powder compaction methods, post-treatment, multiscale characterisation, and functional testing, enabling rapid translation from material design to validated component performance.
  • Find more about facilities.

NTU Motor Lab

school of eEE
50 Nanyang Avenue
Singapore 639798
Tel: (65)67911744

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