Electric motor test bench (Ilmenau)

Electric motor test bench Ilmenau

The ongoing electrification of the drivetrain in cars and trains requires in-depth analyses of the drive, taking into account the respective boundary conditions and application scenarios.

The electric machine test bench is available for testing test specimens and is able to simulate the electrical energy sources present in the system, the mechanical load and various peripheral requirements. The test bench environment enables the testing of electrical drive trains or individual electrical machines and can be flexibly adapted to customer requirements. The facilities are located in the Thuringian Innovation Centre for Mobility (ThIMo-II) at TU Ilmenau.

Fields of application


Power and efficiency measurement of electrical machines


Thermal measurement


Technical data


Maximum drive power

400 kW

Maximum speed

8,000 rpm

Maximum torque

3,000 Nm

Shaft connection

Taper bush

Available components



CAN, RS422

Input voltage

0-850 V


160 kW / 320 kW

Output voltage

560 V AC

Output current

270 A Eff

Rotary encoder

Endat compatible




120 kW


720 A


0 – 1000 V

Cooling water temperature control

90 kW cooling capacity / 6 kW heating capacity

Flow rate

up to 60 l/min


up to 3.8 bar

Temperature range

20-90 degrees

Auxiliary voltage

5, 12, 24, 48 and 72 V

Measurement technology

HBM GEN7ta (CAN-Recording, 6 Phases)

Sampling rate

2 MS/s




LEM-Transducer IN500 (500Aac rms)


Kistler 3kNm and Kistler 100N


Type K thermocouples

NVH-Analysis/Vibration measurement

A laser Doppler vibrometer is used to investigate the vibration behaviour of mechanical structures, here in the context of powertrain components (electric motors, wheel carriers, chassis) in the rail and road transport sector. The use of this measuring device makes it possible to carry out a detailed analysis in the area of NVH (noise, vibration, harshness) so that natural frequencies, vibration excitations and the resulting noise emissions can be determined. Depending on the type of measuring device, the vibration modes generated during the measurement are displayed graphically and three-dimensionally with the associated frequency, allowing quick and well-founded statements to be made about the vibrations that occur despite complicated structures.

Electric motor test bench (Ilmenau)
Test bench vibration measurement

Fields of application


Vibration measurement


Harmonics of mechanical excitation


Harmonics of electromagnetic excitation


Evaluation of mechanical noise sources


Modal analysis


Polytec PSV Qtec Scanning Vibrometer


Frequency range

up to 20 kHz


24 bit

Speed measuring range

25mm/s to 12,5 m/s

Scan angle H x V

50° x 40°

Shortest measuring distance

125 mm


Modal hammer, reference sensor

Accelerometer HBK 4528-B-001



4 units (can be used simultaneously)

Frequency range X, Y

0,3 Hz to 10 kHz

Frequency range Z

0,3 Hz to 12,8 kHz

max. acceleration

700 m/s² (71g)

Operating temperature

-60 to +165 °C

Evaluation software


BK Connect


Dr.-Ing. Frank Rinderknecht

Head of Research Area
German Aerospace Center (DLR)
Institute of Vehicle Concepts
Alternative Energy Conversion
Pfaffenwaldring 38-40, 70569 Stuttgart