of advanced electrical machines in the automotive industry
is growing very rapidly, driven by the demands for improved
fuel efficiency, emissions reduction and performance benefits. Many
of these new applications place exceptionally demanding design
challenges on the electrical drive system, requiring very high
performance at low cost whilst operating in difficult mechanical
and thermal environments, often at low voltages.
are “pushing the boundaries” of existing motor and
control technology but SR Drive® technology
has risen to this challenge. With a unique blend of performance
attributes - high efficiency, robustness, reliability, high temperature
capability and operation over wide speed range - SR Drive® technology
is being developed by NSRD for many applications including: starter
generators, hybrid traction drives, actuators and turbo machinery.
Drives® : Benefits in the Automotive industry.
Highly efficient over a wide speed range
Minimal rotor losses due to the absence of any rotor windings
Low switching frequencies minimize electrical losses in the
A very compact solution
Stator coils have exceptionally short end-windings, allowing
high torque capability from a very small motor.
Low switching frequencies reduce the size and rating of the
Highly cost effective solutions
Straight-forward motor construction requires minimal tooling
Reduced power electronics ratings permit cost savings over
Fundamentally robust and reliable
Absence of rotor windings reduces bearing temperatures and
extends bearing/lubrication lifetimes.
No permanent magnets, so no risk of torque loss due to de-magnetization
or of uncontrolled generating modes at high-speed.
Precise speed control is possible without external sensors.
System operates even with one
phase down – vital ‘limp
Unlike conventional drives, there is no short circuit path
in the drive output stage.
Simple construction is based on re-cyclable core materials: iron