Active Load Emulator

powered by LGE

“The Future of electric vehicle inverter testing”

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Motor Emulation

  • Motor emulation accuracy over 95%
  • Fast respone for Torque / Rpm variation
  • Resolver and encoder interface
  • System protection for various fault conditions
  • Mulit-phase (3,6,12) motor applicable (G2.0)

Battery Voltage Emulator

  • Voltage source for evaluation inverter
  • Supply voltage up to 1000 VDC (G2.0)

Low Investment and Operation Cost

  • Compact design having small footprint
  • Low initial Investment and maintenance
  • High energy efficiency

Scalable Power Capacity (G2.0)

  • High power inverter test (Max 1.2 MW)

Dynamo vs. Active Load Emulator

Inverter Test on Dynamo

LG Active Load Emulator

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Size (W x H x D)

740 x 2170 x 1150 mm

1250 x 2000 x 1290 mm


1600 kg

2000 kg

Power Capacity

Individual channel 150 kW
Parallel 300 kW

Individual channel 150 kW
Parallel 300 kW


DI Water or compatible

Coolant Flux

45 L / min

60 L /min

IP Rate

IP 20

Service Life

10 Years

Battery Emulator




Nominal Power

60 kW

80 kW

Output Voltage

195 - 800 VDC

195 - 1000 VDC

Nominal DC Current

240 A

240 A

Motor Emulator




Num. of Motor

Individual Two Motors, Parallel One Motor

Operation AC Frequency

0 - 800 Hz

0 - 1500 Hz

Individual AC Load Current

400 Arms (Nominal)
500 Arms (60s / 10min stop)

Parallel AC Load Current

800 Arms (Nominal)
1000 Arms (60s / 10min stop)

Power Extension

N / A

Up to 4 parallel connections

Back EMF

0 - 480 Vrms

0 - 612 Vrms

Torque Direction

P, N

Num. of Motor Pole

- 24 poles

Resolver Lobes / Offset

2 - 24 / -π - π

Resolver Excitation Frequency

10 - 20 kHz

Encoder Type / PPR

N / A

Incremental (A, B, Z)
 / 0 - 512 PPR



ALE G1.0

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ALE G2.0

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Active Load Emulators are highly relevant in inverter test bench technology as well. An inverter is an electronic device that converts direct current (DC) to alternating current (AC) or changes the frequency, voltage, or phase angle of the AC output. Such inverters are used in various applications, including renewable energy sources like wind or solar power, electric vehicles, industrial installations, and more.

  1. Load Simulation: Inverters need to be tested under different load conditions to ensure they can deliver expected performance and stability. Active Load Emulators allow simulating and testing the output power produced by the inverter in a controlled environment.
  2. Power Hardware in the Loop: Due to the regenerative feedback enabled by the use of this technology, the energy demand is significantly reduced.
  3. Efficiency Testing: The efficiency of an inverter can be measured by simulating different load conditions. An Active Load Emulator can impose variable loads on the inverter, assessing its efficiency across the entire operational range.
  4. Dynamic Tests: Inverters often need to handle rapid load changes, particularly in applications like electric vehicles. An Active Load Emulator can replicate such dynamic load changes, evaluating the inverter’s ability to respond quickly.
  5. Stability Checks: Inverters must operate stably, without causing unwanted oscillations or instabilities in the system. Simulating various load conditions using Active Load Emulators can help verify the inverter’s stability.
  6. Development and Validation: When developing new inverters or updating existing models, Active Load Emulators facilitate thorough validation and optimization before the inverters are deployed in real-world applications.

Overall, Active Load Emulators are indispensable tools in inverter test bench technology for analyzing and ensuring the performance, reliability, and interaction of inverters with the power grid or other energy sources.

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Easy to Use

  • No rotational parts
  • Small form factor (in line test OK)
  • Configurable with Automatic Test System

Safety / High Reliability

  • Safety for Electric and EMC
  • Self Overload Protection
  • Long time continious operation (4500 hours in validation process)
  • Robust / Reliable


  • EV inverter R&D Status
  • Validation Process
  • End of line test for mass production
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The Future of Inverter Testing

  • Power Hardware in the loop
  • Motor Emulation
  • Battery Emulation
  • Easy! Fast! Safe!

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