Automotive Engineering - March 2024 - 24

MAGNA
puts multiple
innovations in new, more
efficient 800v e-motor
Joerg Grotendorst, Magna's senior vice president for R&D, talks about the
next-gen traction motor. The cutaway image shows the motor's traditional
copper windings.
Magna Chief Engineer for Powertrain Electrification Mike Dowsett
talked about the new motor and its entire line, including e-axles
fit for off-road vehicle use.
Magna has accounted for bearing current,
a damaging phenomenon in which electrical current
from the magnets finds its way to the bearings and
exceeds the breakdown voltage of the lubricant.
Dowsett said engineers employed the following bearing-current
fighting techniques:
* Isolating the bearings
* A common mode choke, which works to filter out the current from
being passed through the bearings
* A clamp that shorts the current to the ground
Without all three, he said, most electric motors are prone to premature
failure - as early as around 50,000 miles.
Magna was already using silicon carbide chips, which are more efficient
than silicon chips due in part to their low thermal expansion
and high maximum current properties. For the next-gen motor, the
chips, instead of being embedded in ceramic material, are embedded
directly in the PCB. " This improves the switching losses, but it also
improves the way that we interface with this. We won't see any large
welded components and bond wires and all that. " He continued: " It
really simplifies things and allows us to cool these for one side only. "
The motor also is run with optimized electrical pulse patterns to
The cooling schematic of Magna's new e-motor.
24 March 2024
reduce noise with no accompanying power drop.The motor's sustainability
features include a reduction in the use of rare-earth materials
AUTOMOTIVE ENGINEERING
CLOCKWISE FROM TOP LEFT: SAE/CHRIS CLONTS; SAE/CHRIS CLONTS; MAGNA

Automotive Engineering - March 2024

Table of Contents for the Digital Edition of Automotive Engineering - March 2024

Automotive Engineering - March 2024 - INTRO
Automotive Engineering - March 2024 - SPONSOR
Automotive Engineering - March 2024 - CVRA
Automotive Engineering - March 2024 - CVRB
Automotive Engineering - March 2024 - CVR1
Automotive Engineering - March 2024 - CVR2
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