Tech Briefs Magazine - February 2022 - BT-11

is important to select testing system
inverters that can deliver broader output
voltage ranges, from 20 V to 1150 V DC,
and ever-increasing DC output current
demands, e.g., beyond 2000A. Equally
important is the inverter control mode:
How tightly can it control the required
output by providing constant voltage,
current and power according to the
power cycling required in the testing.
For example, the Rexroth IndraDrive
ML inverter provides precise and accurate
control, with less than 0.1 percent
ripple (EV DC power systems have virtually
no ripple). This is due to the high
dynamics in its power stage and controller
section, and the closed loop measurement
at the DC/DC converter output.
Given that numerous battery and eaxle
test stands will most likely be needed
to support high-volume automotive
manufacturing, inverters that support reliable
and clean DC power and efficient
bus sharing are important considerations.
Inverter cooling is equally important,
given that banks of inverters will need to
support multiple test stands in a highthroughput,
end-of-line testing environment.
Liquid-cooled inverters can support
high power density and effective heat dissipation,
helping make the testing equipment
more energy efficient while minimizing
floor space demands. In addition,
liquid cooling is also the cooling method
used for batteries and e-axles.
One final consideration is safety:
Inverters with industry-standard, welldesigned
safety disconnects and safe
motion/safe torque-off capabilities (integral
software elements of the inverter
controller) make it much easier to implement
safety protocols to protect workers
and testing equipment.
Work with Experts in Electric
Drive Technology
It's clear that battery pack and eaxle
test stands will be critical proAvailable
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duction tools that manufacturers will
depend on to ensure the vehicles they
deliver to customers leave the plant
with the set state of charge, discharge
and full charge performance customers
expect.
Today's leading suppliers of industrial
electric drives and inverter technology
have deep experience creating inverters
engineered to meet demanding automation
requirements. EV manufacturers
and their production equipment suppliers
can benefit from this expertise as
they further evolve their testing capabilities.
This can accelerate the creation
of systems that can efficiently and accurately
complete testing cycles and
enable them to meet the rapidly rising
demand for electric vehicles.
This article was written by Karl Rapp,
Application Engineer Manager, Automotive
& Machine Tools, Bosch Rexroth Corp.,
Bethlehem, PA. For more information visit
.
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Battery & Electrification Technology, February 2022
11
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