The Electrical Machines & Drives Research Group

The University of Sheffield, UK

Electrical Machine and Drives Group

Automotive Renewable Energy Aerospace

Industrial Marine Consumer Product

• Encompass most facets of electrical machines and drive systems (power electronics, electromagnetic

devices, electrical systems and control systems)

• Strong industrial collaboration, particularly in automotive and aerospace sectors

• Capability for producing and testing demonstrator systems

• Applications embrace different market sectors

The Electrical Machines & Drives Research Group

The University of Sheffield, UK

Prototype 125,000rpm motor

Modal analysis

• PM brushless ac/dc

• Switched reluctance

• Linear machines

• High-speed machines

• Low-speed direct-drive machines

• Halbach magnetised machines

• Fault-tolerant machines

• Flux-switching machines

• High temperature machines

• Computer-aided design

• Acoustic noise and vibration

• Loss calculation

(e.g. iron loss,

aerodynamic loss)

Electrical Machines Research

The Electrical Machines & Drives Research Group

The University of Sheffield, UK

Power Electronics Research

• Drive circuit topologies

• PWM strategies

• EMC

• Induction heating

• Resonant link converters

• Matrix converters

• Multi-level inverters

• Active rectification

• Losses in devices

• Power integrated modules

3rd-order resonant LCC converter

200kHz, 2.5kW

modular power

supply for induction

heatingIntegrated power silicon

phase leg module with

direct copper bonded

substrate

Thermal resistance

0.122°C/W (cf. 0.29 °C/W

for Fuji module)

Matrix converter test bench

The Electrical Machines & Drives Research Group

The University of Sheffield, UK

Batteries

Flywheels

Supercapacitors

- 36V, VRLA battery pack based on Hawker Cyclon

cylindrical cell

- SOC, voltage, temperature monitored continuously

- cells conditioned as required and faulty cells bypassed

automatically

- For peak power buffer

- 60krpm 30krpm

- ~300Wh recoverable energy

- ~30kWCarbon fibre composite rim

- For peak power buffer

- Connected directly to dc link, whose voltage

varies by ~2:1

Energy Storage Technologies