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PI Collaborate with IMMS and Ilmenau University of Technology to Create Nanopositioning System Using Magnetic Levitation

In the coming years, sectors such as the semiconductor industry, life sciences or biotechnology will continue to grow. Increasing requirements in these sectors often affects supporting technologies, a typical example of this is found in drive technology: Inspection and manufacturing systems in the semiconductor industry for example, normally use air-bearing technology and magnetic linear motors.

However, the requirements for precision will continue to increase up into the nanometer range. Such systems also reach their limits when applications require work in a vacuum or nitrogen atmosphere. This issue has now been taken up by drive specialists, who have already achieved promising results with a new electromagnetic nanopositioning system.

New nanopositioning system based on magnetic levitation: The passive rod levitates on a magnetic field, which actively guides it. In this way, objects can be moved linearly or rotationally on a plane with a previously unattained guiding accuracy. (Photo: PI)

When a feeling for markets, competence and teamwork ability come together, the user profits. This is currently being proven by a colaboration between PI (Physik Instrumente) in Karlsruhe and IMMS (Institut für Mikroelektronik- und Mechatronik-Systeme) and the Department of Mechatronics of Ilmenau University of Technology. The result of their collaboration is a novel nanopositioning system based on the principle of magnetic levitation (figure 1). The platform levitates on a magnetic field that is generated by six coils and is actively monitored via a 6-D sensor. The magnetic field functions as a drive and actively guides the platform. The drive and the compact high-resolution measurement system for the six degrees of freedom was developed so that the platform remains passive, in other words no cable connections are necessary. A two-dimensional, optically incremental measurement system records the position with capacitive sensors and serves to control the drive in all axes. In this way, objects can be moved linearly or rotationally on a plane with a previously unattained guiding accuracy. "The current, already quite advanced development study ‘PIMag 6D’ positions with a resolution of 10 nm," Dr. Rainer Gloess, Head of Advanced Mechatronics at PI, is happy to announce (figure 2). "If the system moves on a circular path with a diameter of 100 nm, for example, the maximum deviation from the ideal path is only a few nanometers."

The prototype currently has a motion range of 100 x 100 x 0.15 mm³. Trajectory motions can be carried out at an acceleration of up to 2 m/s2 and a velocity currently of up to 100 mm/s with nanometer precision. The digital motion controller, based on a modular system from PI, can process different geometry files as well as coordinate transformations and offers an optimum basis for a successful new product line.

About PI

Already well-known and respected for their high-quality products, PI is one of the leading players in the international market for precision positioning technology in the fields of photonics, nanotechnology, semiconductor and life sciences.  The company has been developing and manufacturing standard and OEM products with Piezo or motor drives for over 40 years.  With headquarters in Karlsruhe, Germany, four factories and ten subsidiaries employing more than 700 people globally, the PI group has a presence in every major market worldwide.  The company has been ISO 9001 certified since 1994.

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