The electric vehicle business will approach a massive $500 billion in 2025 with the traction motors being over $25 billion.
The electric vehicle business will approach a massive $500 billion in 2025 with the traction motors being over $25 billion.
Their design, location and integration is changing rapidly. Traction
motors propelling land, water and air vehicles along can consist of one
inboard motor or – an increasing trend – more than one near the wheels,
in the wheels, in the transmission or ganged to get extra power.
Integrating is increasing with an increasing number of motor
manufacturers making motors with integral controls and sometimes
integral gearing. Alternatively they may sell motors to the vehicle
manufacturers or to those integrating them into transmission. These
complex trends are explained with pie charts, tables, graphs and text
and future winning suppliers are identified alongside market forecasts.
There are sections on newly important versions such as in-wheel,
quadcopter and outboard motor for boats.
Today, with the interest in new traction motor design there is a
surge in R&D activities in this area, much of it directed at
specific needs such as electric aircraft needing superlative reliability
and power to weight ratio. Hybrid vehicles may have the electric motor
near the conventional engine or its exhaust and this may mean they need
to tolerate temperatures never encountered in pure electric vehicles.
Motors for highly price-sensitive markets such as electric bikes,
scooters, e-rickshaws and micro EVs (car-like vehicles not homologated
as cars so made more primitively) should avoid the price hikes of
neodymium and other rare earths in the magnets. In-wheel and near-wheel
motors in any vehicle need to be very compact. Sometimes they must be
disc-shaped to fit in.
However, fairly common requirements can be high energy efficiency and
cost-effectiveness, high torque (3-4 times nominal value) for
acceleration and hill climbing and peak power twice the rated value at
high speeds. Wide operating torque range is a common and onerous
requirement. Overall energy saving over the drive cycle is typically
critical. Usually winding and magnet temperature must be kept below 120C
and then there are issues of demagnetisation and mechanical strength.
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