It is not possible to make a generalised choice between pneumatic and electric solutions. Daniel Ditterich, Innovation and Technology Management at Festo, takes a look at current opinions and suggests a sensible mixture of the two technologies, focused on the application in question and energy efficiency.

Electric or pneumatic - which approach is the more efficient? According to Daniel Ditterich, it is not possible to give a generalised answer. The right approach always depends on individual cases. The strength of Festo is that the company can offer both technologies. Says Ditterich: "We can provide expert technology-neutral advice which gives users a view of both alternatives, thanks to the fact that we have knowledge and experience of both electrical and pneumatic solutions."

Hybrid solutions are often an efficient alternative

According to Ditterich, a useful approach is to combine the best features of both worlds. This is what was done in a typical application to find a solution for a packaging machine. A conveyor belt accepts a product and sets it down again on a second conveyor belt with an outer packaging. This requires two motions: an X axis with a maximum stroke of about 1000 mm and a Z axis with a stroke of around 100 mm. "We looked at three options: pneumatic, electric or pneumatic-electric drives," says Ditterich. "A mix of technologies with an electric X axis and a pneumatic Z axis proved to offer an optimal combination of efficiency, cost, flexibility and performance, since it allowed both types of drive to play to their strengths." For example, the electric axis offers highly dynamic operation and flexibility, while the pneumatic axis is distinguished by its compact size and low weight.

The current perspective for new products

In recent years, ecological factors have become more and more important for many applications and customers. At the same time, the question of costs cannot be ignored. According to Ditterich, it is advisable to keep an eye on both these aspects. It is important to focus not only on initial purchasing costs but also overall and environmental costs. It is becoming more and clear that developers need to consider a large number of criteria in almost every technological decision. "Ultimately, this decision involves a process in which an optimal solution must be found on the basis of specific parameters without falling back on generalised statements," explains Ditterich.

We can provide users with expert technology-neutral advice, including a view of both alternatives, thanks to the fact that we have knowledge and experience of both electrical and pneumatic solutions. - Daniel Ditterich, Innovation and Technology Management, Festo AG & Co KG