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YASA Limited
YASA designs and manufactures com-
pact, lightweight and powerful elec-
tric motors, motor controllers and dc-dc
converters for use in advanced hybrid
and electric vehicle powertrains.
The company’s revolutionary electric
motors and controllers enable cost-ef-
fective vehicle hybridization and electri-
fication – especially when there is a de-
sire for minimum powertrain size and
weight. This is because the high-power
density of the e-motors and controllers
provide vehicle engineers with addition-
al flexibility to increase electric vehicle
range, load carrying capacity or perfor-
mance without compromising cost.
About YASA.
The company was formed in 2009 to ex-
ploit electric motor technology devel-
oped by the company’s founder and cur-
rent CTO, Dr. Tim Woolmer during his
DPhil studies at the University of Oxford.
The YASA motor (YASA stands for yoke-
less and segmented armature) was quick-
ly adopted in motorsport and high-per-
formance vehicles including the Jaguar
CX-75 and Koenigsegg Regara.
Today, YASA supplies custom and off-
the-shelf e-motors and controllers pri-
marily to automotive customers from its
headquarters and 100,000 unit pa series
production facility near Oxford in the UK.
YASA Power Electronics Technology
YASA’s focus on high-power density
powertrain solutions is reflected in the
development of revolutionary power
electronics technology that leverages
learning from YASA e-motor develop-
ment, particularly for very efficient liquid
cooling. Proprietary cooling architecture
and YASA manufacturing technology
enable the company to manufacture e-
motor controllers with apparent power
density in excess of 40 kVA / Litre.
YASA Product Example (Pictured)
The YASA 400V, 600A controller is an
automotive grade controller / inverter
designed for use with YASA and other
motor types including permanent mag-
net and induction types. Control is via
CAN bus with ISO 26262 functional
safety support up to ASIL C. Multiple
monitoring and control interfaces are
provided.
• Input voltage range: 50 to 400 V dc
• Continuous Output current:
300 A RMS (3-phase)
• Mass: 4.9 kg
• Volume: 5.1 litres
(excluding terminal area)
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