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Sensor telemetry

Temperature measurement for e-drives

Temperature measurement using Manner (Germany) sensor telemetry adds additional safety features to the development of electric drives. The measured data can be passed to the data acquisition system via a CAN interface.

(Photo: Manner)

Whether on the test bench or on the road – the high power density of modern electric drives for hybrid and pure electric vehicles places high demands on temperature measurements in the rotor. The measurement is used for the precise and reliable detection of the engine’s temperature profile in all operating situations. Based on these data, developers and designers can ensure that no critical temperatures are reached in any driving conditions. The use of temperature measuring technology in the heart of the electric motor adds factors which place highest demands on the measuring and transmission technology: high temperatures, high speeds, strong electromagnetic influences, and a very restricted space. This is where Manner sensor telemetry comes in: if offers temperature resistance up to 185 °C, electromagnetic robustness, oil resistance, and a compact design.

From starting and accelerating to mountain driving – temperature control is critical for operational safety in the subsequent series production. Modern electric drives are based on rare-earth magnets, which are characterized by permanent magnetization. This magnetization must at no point be put at risk by exceeding the Curie point. Manner’s detection unit and telemetry modules measure within 1 °C of accuracy under the toughest conditions. Users have the choice between thermocouple elements and a Pt100 temperature sensor. Access holes allow the use of a 0,5-mm thick, flexible sheath thermocouple element through a precisely eroded access path. Through this hole the thermocouple element is inserted and glued to the desired measurement point inside the drive.

Reliable data transmissions

The measurement signals of the thermocouple element are recorded and transmitted contact-free to the stationary unit. The measured data can be passed to the data acquisition system as a classic analog signal with 0 V to ±10 V or as a digital signal via the CAN interface. All telemetry modules are temperature resistant up to 185 °C. The tighter the space that is available for the application, the more important is the exact and space-saving design of the telemetry housing. The miniature telemetry modules, technologies, and systems allow the modular integration of telemetries into rotors of any geometry. To ensure that the housing can be adapted to any rotor and any installation situation, each housing can be designed to application-specific requirements.


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Manner Sensortelemetrie