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High-speed Measurements on Advanced e-mobility systems

Modern mobility systems such as e-cars, e-scooters, e-aircrafts, or rail vehicles have electronic components as key components for propulsion. The functioning of these mobility systems entirely depends on the reliability of these electronic components, which consist of a battery, inverter, and e-motor. The inverter controlled drives of such vehicles utilize an intelligent power module which includes basic control circuits. It uses PWM (Pulse Width Modulation) to enable the speed controllers to control the flow of current from the battery pack to the motor. The PWM method involves supplying pulses of electric current to the motor, in which electric current is supplied to the motor for a very short period of time, and then turning off the current, and repeating this many times per second. To analyse the inverter controlled drives in this process, very high sampling rates are necessary as the process takes place at high-speeds. 

Often, the inverter controlled drives in these vehicles are sensitive to power quality issues, which is why data acquisition systems are employed to monitor the current and voltage from the inverter driven e-motor. The imc EOS data acquisition system delivers precise 24-bit high-resolution signals with Up to 4 MHz sampling rate per channel and system, which is ideal for this application. It collects input from a direct connection of voltage, precision current transducers, and IEPE/ICP sensors such as accelerometers, microphones or piezoelectric force sensors. The signal input can be either a BNC or LEMO connection. The acquired signals are then digitized with 24 bits and the analog bandwidth can be extended up to 1.8 MHz. To get full control over the measurement process, the imc Studio software provides a clearly organized channel configuration list, extensive sorting and filtering functions, numerous assistants, built in sensor management and support of TEDS. 

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