The impact of Industry 4.0 on motor systems is a migration from the ‘automation pyramid’ to ‘networked systems, says Sydney Govender
The fourth industrial revolution, which is also known as Industry 4.0, refers to the combination of physical assets and advanced digital technologies that communicate, analyse and act upon information, which in turn enables organisations and consumers to be flexible and make more intelligent, responsive, data-driven decisions.
Industry 4.0 has emerged as a result of the intelligent networking of computers, people and devices, fuelled by data and machine learning, using all possibilities of digitalisation across the entire value chain.
This significant change in technology has led to a whole new way of working in a digital world. It embraces the internet of things (IoT), artificial intelligence (AI), robots, drones, autonomous vehicles, 3D printing, cloud computing and nanotechnology, to name a few.
Trends in Industry 4.0 automation systems
In automation systems, the impact of Industry 4.0 on motor systems is a migration from the ‘automation pyramid’ to ‘networked systems’. This means that the various elements of the system, such as motors, drives, sensors and controls, are interconnected and connected to a cloud data centre, where data is stored, processed and analysed and decisions are made. In an automation network, the amount of data is prominent. As data is mainly produced by sensors, the number of sensors in modern automation systems is increasing. Sensors are required to collect data from motors and motor-driven machines, such as fans, pumps and conveyors, and then connected to the data network by various means to use the data. Modern variable-speed drives open new opportunities in the Industry 4.0 automation network. Traditionally, drives have been considered power processors for controlling the motor speed. Today, drives are also part of the information chain, using the advantage of built-in processing power, storage capacity and communication interface, within the drive itself.
What is an intelligent drive?
In the Industry 4.0 network, the drive plays an important role and is characterised by some enabling features:
The signals are used to trigger maintenance or lead to system design improvements. Motor current signature analysis techniques enable the drive to monitor the condition of the motor and application. The technique allows the system to potentially eliminate physical sensors, or extract early fault signatures that might not have been possible to detect. For example, using the technique makes it possible to detect winding faults in advance or mechanical load eccentricity. The concept of the drive as a sensor hub involves connecting external sensors to the drive, thus saving the need for a gateway to connect the physical sensor to the data network. Vibration sensors, pressure sensors, and temperature sensors are examples of sensors which can be connected to the drive. The advantages of the concept include as well as being able to correlate sensor data with different types of data present in the drive.
Why is condition-based maintenance needed?
The condition of a piece of equipment typically degrades over time. The introduction of Industry 4.0 and the availability of sensor data means that condition-based and predictive maintenance is now possible. The idea of condition-based maintenance is to detect the potential failure before an actual failure occurs. Such maintenance strategies use actual sensor data to determine the condition of the equipment in service (condition-based maintenance) or to predict future failures (predictive maintenance). Condition-based maintenance acquires data from the equipment itself and uses it to monitor the health of the equipment in service. For this purpose, key parameters are selected as indicators to identify developing faults.
In this case, planning maintenance actions provides many advantages such as:
Condition monitoring follows a three-step procedure:
Conclusion
Today, drives are more than simple power processors – they are vital elements in modern automation systems, with the ability to act as sensors and sensor hubs, and to process, store and analyse data, along with connectivity capabilities.
Drives are often already present in automation installations and, therefore, present a great opportunity to upgrade to Industry 4.0. This enables new ways of performing maintenance, such as condition-based maintenance. The functions are already available in some drives, and early adopters have already started using the drive as a sensor.
The writer is Danfoss Drives South Africa Senior Country Sales Manager.
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