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Automation Technologies 4/2015

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Automation Technologies 4/2015

SENSORS AND MEASUREMENT

SENSORS AND MEASUREMENT Innovative torque measurement applications in motor test benches Michael Guckes Measuring torque, rotational speed, angle of rotation and the quantities derived from these variables is assuming an ever greater role in the design of new test benches for use in industrial environments. In addition to higher requirements for accuracy and speed, further determining criteria for the selection include options for automation and efficient operation. How can all of this be achieved? Focusing on cutting the carbon footprint and hence the costs, the Engine manufacturers and drive train engineers are facing a real challenge: To enhance the performance of current and future engines such that they offer better fuel efficiencies in order to lead over their competition and satisfy customer expectations. In addition, efficient and flexible testing methods are expected to be provided. Preparing and conducting tests at different times and assigning them to different organizational units allows for efficiency improvement by a factor of 10. Author: Michael Guckes, Product and Application Manager, Industrial Amplifiers, Hottinger Baldwin Messtechnik GmbH, Germany 01 AUTOMATION TECHNOLOGIES 4/2015

SENSORS AND MEASUREMENT next page One of the requirement of these tests is that they have to be accomplished in short period of time. Intelligent sensors and amplifier systems make this possible. Precise measured values and accuracy of the torque flanges combined with dynamics and high rotational speed are other important requirements of the system. At the same time, the amplifier and the test bench control system must be capable of processing the measurement data with high resolution and in real time, making them available for analysis and storage. Ideally, an amplifier system combines all these functions in a single device, for example PMX from HBM. Such systems are flexibly fitted with measurement and output channels for use in testing phase and also as measurement and automation systems in production phase. Depending on the level of automation, either analog or Ethernet-based fieldbus interfaces can be used in real time. Torque sensor design Modern torque transducers work with high sample rates to be able to meet the high requirements of the tests. Output signals such as torque, rotational speed and angle of rotation enable quantities such as power and energy conversion efficiency to be calculated in the downstream automation system. The measurement signals are converted into frequency signals to ensure noise-free transmission. 03 01 Hbm‘s comprehensive range of torque transducers 02 02 PMX measuring amplifier system provides simple integration in industrial automation systems 03 Efficient service through built-in diagnostics and fault memory AUTOMATION TECHNOLOGIES 4/2015

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