The aim of the study is to design and test a measurement system for the characterization of a brushless DC motor, which was selected for the development of a particle analyzer pump for Mars. This would allow verification of the motor performances in critical environment, i.e. low temperature and pressure conditions. The measurement system was designed in order to cope with the unconventional environment, exploiting piezoresistive strain gauges. Design of the measurement system was performed by means of finite element approach in order to optimize the measurement sensitivity with respect to the expected maximum torque, that is in the order of few newton per millimeter for the intended application. Characterization of the torque-sensor was performed evidencing the effect of the measurement disturbance, i.e. possible bending in the measurement setup. A procedure for disturbance correction in the measured torque is proposed and validated.
Lo scopo di questo studio è progettare e testare un sistema di misura per la caratterizzazione di un motore brushless in corrente continua, per la missione spaziale ExoMars 2020 con l’obiettivo di alimentare una pompa per l’analisi delle polveri. Questo implica una caratterizzazione delle prestazioni del motore in condizioni critiche come bassa temperatura e pressione. Il sistema di misura è stato progettato per far fronte ad ambienti non convenzionali, focalizzandosi sull’utilizzo di estensimetri a semiconduttore. La progettazione è stata eseguita attraverso l’analisi a elementi finiti per ottimizzare la sensibilità, basandosi su un valore di coppia massimo stimato nell’ordine di pochi newton millimetro. La caratterizzazione del sensore è stata eseguita evidenziando l’effetto dei disturbi, come momento flettente e taglio, nel setup di misura. É stata inoltre proposta una procedura di correzione della coppia.
Design and verification of a torque measurement system for low pressure environment
CASARTELLI, DAVIDE
2017/2018
Abstract
The aim of the study is to design and test a measurement system for the characterization of a brushless DC motor, which was selected for the development of a particle analyzer pump for Mars. This would allow verification of the motor performances in critical environment, i.e. low temperature and pressure conditions. The measurement system was designed in order to cope with the unconventional environment, exploiting piezoresistive strain gauges. Design of the measurement system was performed by means of finite element approach in order to optimize the measurement sensitivity with respect to the expected maximum torque, that is in the order of few newton per millimeter for the intended application. Characterization of the torque-sensor was performed evidencing the effect of the measurement disturbance, i.e. possible bending in the measurement setup. A procedure for disturbance correction in the measured torque is proposed and validated.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/141569