Key Highlights
- Advancements in inverter technology, such as field oriented control and PID feedback loops, allow induction motors to achieve the high precision and efficiency traditionally reserved for servo motors.
- Digital twins serve as comprehensive virtual replicas that accelerate the design and commissioning process by allowing engineers to analyze system behavior before physical hardware is ever built.
- Building an accurate digital twin requires real-time, time-aligned data, such as power, torque and vibration, to bridge the gap between electrical inputs and mechanical outputs.
Cristian Loris is product manager, Yokogawa Test & Measurement.
Servo motors have traditionally been preferred for high-precision, high-response applications. How might an inverter affect someone's evaluation of switching out servos for induction motors?
Cristian Loris, product manager, Yokogawa Test & Measurement: The inverter plays a much more critical role in servo motor systems than in traditional induction motor variable frequency drives. Modern inverters now incorporate feedback loops that allow the drive to understand the current state of the motor and apply more precise PID control. This enables more accurate regulation of speed and torque. Advanced control techniques such as field oriented control (FOC) also improve performance by optimizing how the electromagnetic field created by the stator interacts with the rotor field. By controlling these fields more precisely, the drive can improve efficiency and dynamic response. As inverter control technology continues to advance, it can make induction motor systems more competitive in applications that previously relied on servo motors.
How have frequency inverters evolved over recent generations in terms of control features, communication protocols and energy efficiency?
Cristian Loris, product manager, Yokogawa Test & Measurement: Building on the above, inverters have evolved from relatively simple frequency generators into devices that incorporate feedback and control loops. This allows the inverter to understand the state of the motor and adjust operation accordingly for both position control and energy optimization. Modern inverters also integrate more advanced control algorithms and communication capabilities, allowing them to be more tightly integrated into automated systems while improving overall motor performance and efficiency.
The definition of a digital twin can vary, based primarily on the application. What's your definition, and how are digital twins utilized within the development and commissioning processes, and what impact have digital twins had on reducing project lead times or improving reliability?
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Cristian Loris, product manager, Yokogawa Test & Measurement: A digital twin is a virtual replica that mirrors as many of the physical properties of a system as possible. With this virtual model, engineers can perform faster and deeper analysis before building the physical system. This helps identify the required characteristics and potential design considerations for a given application. While digital twins can accelerate the research and design process, it is still important to validate these parameters through real-world testing. Certain physical effects and system interactions cannot always be fully captured in software alone.
What kinds of data and sensor inputs are most valuable for building accurate digital twins of drive systems, and how important is it to ensure real-time synchronization between physical and virtual models?
Cristian Loris, product manager, Yokogawa Test & Measurement: Characterizing parameters such as power input versus power output, torque, speed and vibration is important to ensure consistency between physical and virtual models. Having these measurements time-aligned allows engineers to better understand the relationship between electrical and mechanical behavior. For example, synchronized data can reveal phenomena such as torque ripple and correlate it with the sinusoidal current waveforms produced by the drive. Reflecting this information back into the virtual model helps validate both the physical system and the digital twin.
About the Author
Mike Bacidore
Editor in Chief
Mike Bacidore is chief editor of Control Design and has been an integral part of the Endeavor Business Media editorial team since 2007. Previously, he was editorial director at Hughes Communications and a portfolio manager of the human resources and labor law areas at Wolters Kluwer. Bacidore holds a BA from the University of Illinois and an MBA from Lake Forest Graduate School of Management. He is an award-winning columnist, earning multiple regional and national awards from the American Society of Business Publication Editors. He may be reached at [email protected]
