# The Impact of an Electric Machine Body on EM Wave Propagation in RTMS
## 2 RTMS (Rotor Temperature Monitoring System) Design
The acquired data undergoes processing in the signal conditioning module before being transmitted to the wireless module. Conversely, the stationary receiver includes a data processing module, control unit, wireless receiving module, receiving antenna, display module, and data storage module. The receiving antenna detects and demodulates the frequency-modulated (FM) signal using the wireless receiving module [23]. The demodulated signal is then directed towards the control and display module via a designated bus, or it may be temporarily stored in the data storage module. Earlier research endeavors predominantly concentrated on forecasting electromagnetic wave propagation (EMWP) characteristics in scenarios featuring stationary or moving wireless transceiver systems. As a result, the principal aim of this paper is to undertake an initial examination of EMWP characteristics in rotating environments and institute a testing setup for evaluating EMWP propagation features of both stationary and rotating transmitters. \"The IoT in Industry 4.0\" refers to the integration of the Internet of Things (IoT) technologies within the framework of Industry 4.0, which represents the fourth industrial revolution. In this context, IoT plays a pivotal role in enhancing connectivity, communication, and automation in industrial processes. The synergy of Industry 4.0 and IoT involves embedding smart sensors, devices, and actuators into physical assets, machinery, and production systems. These interconnected devices collect real-time data and communicate with each other over a network, enabling intelligent decision-making, predictive maintenance, and optimization of manufacturing processes. The goal is to create a more efficient, flexible, and responsive industrial ecosystem where data-driven insights contribute to improved productivity, resource utilization, and overall operational excellence. The integration of IoT in Industry 4.0 signifies a transformative shift in how industries manage and leverage information, fostering innovation and adaptability in the modern industrial landscape. In the specific context of controlling electrical machines, IoT 4.0 facilitates wireless communication between the electrical machine and its control system [24; 25], allowing for remote monitoring and management of the machine. This capability enhances operational efficiency and flexibility. Sensors with IoT 4.0 can be seamlessly integrated into the electric machine to collect data, enabling analysis for optimized operation and proactive breakdown prevention. In this regard, our proposed system, RTMS, aligns seamlessly with the principles of IoT Industry 4.0 [26; 27]. Fundamentally, a RTMS involves wireless RF propagation connecting a fixed sender module situated within the EM to a stationary receiver positioned outside. This technological innovation has revolutionized the manufacturing sector by enhancing overall productivity, minimizing downtime, and enabling predictive maintenance. It is crucial to note that this system serves a dual purpose: assessing propagation quality in the machine and detecting rotor temperature [9; 28]. In this research, the data control system follows the IEEE 802.11 protocol. Providing a comprehensive and dependable analysis of the RF channel is imperative to ensure the effectiveness of a rotor temperature monitoring system. Key components in characterizing the RTMS encompass the carcass, stator, rotor, and shaft. These elements notably impact the parameters of the sensor antenna, including the radiation pattern and antenna gain. It is important to highlight that the propagation between the shaft and the receiver doesn't traverse open space; instead, it passes through the body of the electrical machine and internal equipment.