Rajabzadeh, Behrad (2025) Design and Development of a Multi-Functional Rotational Speed Measurement System for Investigation of Influential Factors. Research Master thesis, Victoria University.

Abstract

In this research, a unique, novel, state-of-the-art hybrid encoder system (The Validist Encoder) is fully designed, developed and implemented for rotational speed measurements. Revolutions per minute (RPM) measurements are crucial for the proper functionality of many devices used in the industry and consumer sectors. Precision is highly valued, whether it is a wind turbine or a motor propeller. This becomes more important in sensitive applications that require high accuracy, while there are factors present influencing the system’s measurement. An autonomous electrical vehicle (AEV) is a good example of this. Speed measurements in AEVs are critical since a simple error can cause catastrophic incidents. AEV’s speed measurement can require measurement of the rotational speed of the shafts and parts engaged in the rotation of the vehicle’s wheels, and the utilized measurement system will be exposed to various influential factors, including vibrations, temperature changes, magnetic fields, etc, while the AEV is operating. This research develops a rotational speed measurement system that can utilize different sensors and methods, providing a platform that is suitable for the examination of different methods, sensors and components in various conditions and situations for a side-by-side comparison of them while allowing investigation of the effects of influential factors on each, to select the best solution for the desired application based on an informed decision. The system comprises several apparatus and two main parts: a specifically designed electronic circuit and a special 3D-printed disk. These two main parts can interact with each other for high-speed rotation tests, while each part can be used individually for experiments. After design, simulations and development, the system is utilized in a high-speed rotation setup and several additional experimentations. Rotational speed measurement methods are not perfect as they generate false results when they are affected by influential factors related to the physics of their operational basis. Among several methods available, there are two mainstream methods used worldwide. The system designed in this research is a beneficial tool for conducting practical experiments. These experiments can be conducted focusing on simulating certain specific conditions in the laboratory environment that occur in situations where these devices are deployed, while being able to observe the functionality, output, and shortfalls for both measurement methods. With the data achieved from this system in the experiments, modifications, improvements, and system developments will be easier, while the costs will be reduced. The developed system is a novel solution practical for use in various applications where false readings are essentially avoided.

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