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Development test tools
Each step in the development of an automotive electric drive system requires
a combination of distinctive test tools to bring it to market quickly and economically
The development process
of an automotive electric drive
system can be visualized as having
three stages: architecture and
design; verification and prototyping;
and e iciency validation.
During the exploratory
architecture and design stage,
testing is carried out on a system
consisting of individual parts and
requires the examination of fast
inverter switching, high-frequency
dynamic behavior and the overshoot
of pulses. A multi-channel
oscilloscope, particularly a
mixed-signal type, which can also
trigger on individual waveforms is
ideal as, with an instrument
equipped with eight channels and
enough memory, the input and
outputs of a three-phase pulse
width modulation system can be
characterized. With the addition
of dedicated in-vehicle serial bus
and power supply analysis, an
oscilloscope with superior noise
performance, such as the Yokogawa
DLM3000, provides the all-round
capability to precisely test the
inverters as well as the other
drivetrain components of electric
and hybrid vehicles.
The verification and prototyping
stage is distinguished by the need
to gain an insight into the overall
dynamic behavior of the
electromechanical system and
to link the cause and e ect of
interdependent parameters.
A ScopeCorder data
acquisition solution, with
flexible modular inputs, is
capable of combining the
measurements of
electrical signals, physical
sensors and CAN/LIN/
SENT serial buses, and
trigger on electrical power
related and other
calculations in real time.
High precision isolated
The Yokogawa DLM3000 oscilloscope is a test and measurement device for detailed engineering insights
inputs up to 1,000V, sample rates
up to 100 MS/s and a Giga point
memory enables an instrument
such as a ScopeCorder to analyze
transient data in fine detail and
trends over periods as long as
200 days in harsh environments.
The key to the third stage is
validation. This requires a dedicated
and calibrated power analyzer,
Motor effi ciency can
be determined using a
precision power analyzer
190 // July 2019 // www.electrichybridvehicletechnology.com
which needs to be able to perform
precise and stable power
measurements on up to seven sets
of inputs simultaneously to confirm
the input/output e iciency of the
inverter and the performance of the
vehicle battery. Six inputs can also
be used to analyze the power
supplied to two individual threephase
wheel motors. Dual harmonic
analysis enables the harmonic
content of two di erent sources,
such as the input and output
of the inverter or variable
speed motor drive, to be
analyzed at the same time as
the normal power parameters.
Additionally, the Yokogawa
WT5000 precision power
analyzer can evaluate the
mechanical performance of up
to four motors simultaneously.
By measuring parameters such as
the motors’ torque, rotation speed
and direction, as well as slip, the
electro-mechanical e iciency of
the motors can also be determined
with high accuracy.
Currently, the combination of all
these individual products are being
used in the development of
automotive electric drive systems.
This variety of dedicated and precise
instruments provides engineers with
fully specified and trustworthy
measurements across the
development cycle of both individual
components and complete systems.
This way engineers can innovate
with precision, flexibility and
confidence and quickly bring their
products from concept to market.
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