Category: Linear Motor, Positioning System

Advances in Precision Motorized Positioning Systems: Selection Criteria

Motion drive and control technologies are advancing rapidly. This means engineers have access to an expanding spectrum of options to leverage previously unattainable performance and form factors. Rapidly evolving production processes have driven needs for motion control systems that provide higher accuracy, speed, resolution, and repeatability. The motion industry has responded with an expanding palette […]

Sinusoidal Scanning Motion Performance: Air Bearings vs. Mechanical Bearings

Application Description Most of the motion solutions we work on typically require either point-to-point positioning or constant velocity scanning motion. In these applications, customers are usually concerned with accuracy, repeatability, or velocity regulation. One special type of motion that is occasionally required is sinusoidal scanning motion. In these applications, the motion stage is expected to […]

Piezo-Mechanisms in X-Ray Spectroscopy: Energy Selection in a Beam Line

PiezoWalk principle shows advantages for Monochromator crystal fine adjustment Piezo-based mechanisms have long been used in precision scientific instruments for precision motion generation. Previously, the limited motion characteristics of simple piezo actuators often made the use of a dual stage coarse/fine approach necessary. A novel approach based on a long-travel PiezoWalk drive shows promise in […]

Performance of Direct-Drive Linear Motor Stages in Precision Positioning Applications

Brushless direct drive linear motors provide advantages over leadscrew and ballscrew driven positioning stages when it comes parameters such as acceleration, maximum speed, accuracy, constancy of velocity, and avoidance of vibration. This article explains types of motors, encoders and provides test data of PI’s new V-551 linear motor stage.   Iron Core and Ironless Motors […]

Reliability of Ultrasonic Motors

1.  Overview PILine® positioning systems are based on a direct drive using ultrasonic piezo motors. Therefore, very low response times as well as accurate positioning can be accomplished. Due to the particular operating principle, PILine® ultrasonic motors are self-locking even when switched off, a great advantage when it comes to position stability. Ultrasonic motors are […]

Positioning Capabilities of Ultrasonic Motors

  1.  Overview While conventional positioning systems convert the rotary motion of a motor into linear motion using a spindle, PILine® positioning systems are based on a special direct drive. This completely eliminates backlash and play and enhances the response time and positioning accuracy. Furthermore, they offer high-resolution positioning and fast step-and-settle performance. At the […]

Scanning Performance of Air Bearings

1.  Introduction A common application in which an air bearing is specified is scanning. Scanning involves moving either a work-piece or an optic at a constant velocity, while a reading or writing operation takes place. Such operations include printing and image-setting (i.e., writing) and imaging (i.e., reading). While the physical act of writing an image […]

High Stability Positioning Stage with Self-Clamping Ceramic Linear Motors Provides Long-Term Nanoscale Stability

An insidious nanoscale instability process is the quasi-asymptotic settling due to lubricant flow processes in drive, alignment and adjustment elements such as lead-screws and micrometer drives. It has been thought that this progresses at the nanoscale over many minutes, but conventional position-metrology instrumentation is typically less stable than recent process tolerances over the timescales involved, […]

Straightness and Flatness of Air Bearings

1. Introduction When working with air bearings, we often describe the quality of motion as one of the key factors in selecting an air bearing; specifically, the straightness and flatness of travel of linear bearings and stages. Just how straight and flat? What levels of precision are achievable? In this technical note, we will discuss […]

Measuring the Smallest Resolution of a Positioning Stage

The trace above, measured by a laser interferometer, shows peak-to peak noise (black) of a linear motor positioning system on the order of 1.8 nm (controller is actively holding a position, no position change commanded). The noise measured by the external metrology (laser) contains the sum of all mechanical and electrical sources – the amplifier […]

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About PI

PI (Physik Instrumente) is a leading manufacturer of precision motion control equipment, piezo motors, air bearing stages and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. PI is present worldwide with fifteen subsidiaries, R&D / engineering on 3 continents and total staff of more than 1,000.

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