Page 87 - Kollmorgen Automation and Motion Control
P. 87

Advantages                                         No Wear or Maintenance
                                                               Linear motors have few components, therefore the need for ball screw
            Wide Speed Range                                   components such as nuts, bearing blocks, couplings, motor mounts and
            Since the frameless parts of the linear motor are non-contact, and   the need to maintain these components have been eliminated. Very long
            no limitations of a mechanical transmission are present, both very   life and clean operation, with no lubrication or maintenance of these
            high speeds and very low speeds are easily obtainable. Speeds are
            truly not limited by the motor. Instead, by eliminating the mechanical   parts are the result.              SER
            transmission, speed becomes limited by other elements in the system
            such as the linear bearings, and the achievable bandwidth from any   Integration of Components is Much Simpler  V
            feedback devices. Application speeds of greater than 5 meters per   Frameless linear motors require much fewer components than rotary   O MO
            second (200 in./sec.) or less than 1 micron per second (.00004 in./sec.)   motors with mechanical transmissions. A 0.8 mm airgap (0.031 inches)
            are typically achievable. In comparison, mechanical transmissions such   for the ironcore design and 0.5 mm airgap (0.020 inches) for the ironless   T
            as ball screws are commonly limited to linear speeds of 0.5 to 0.7 meters  design is the only alignment of the frameless linear motor components   ORS
            per second (20-30 in./sec.) because of resonances and wear. In addition   that is necessary. No critical alignments are required as with ball screws.
            to a wide speed range, linear motors, both ironcore and ironless, have   Straightness of travel as provided by the system linear bearings is more
            excellent constant velocity characteristics, typically better than ± 0.01%   than sufficient for the Kollmorgen linear motors.
            speed variation.
                                                               Typical Applications for Linear Motors Include:
            High System Dynamics
            In addition to high speed capability, direct drive linear motors are   Machine Tool   Measurement/inspection
            capable of very high accelerations. Limited only by the system bearings,   Drilling   Coordinate measurement machines
            accelerations of 3 to 5 G are quite typical for the larger motors and   Milling   Electronic assembly
            accelerations exceeding 10 G are easily achievable for smaller motors.  Grinding   Pick-and-place machines
                                                               Laser cutting         Component insertion                DIRECT DRIVE LINEAR (DDL) MO
            Easy Selection Process:                            Cam grinding          Screen printers
            1. Determine peak and continuous force required for your applications   Semiconductor   Adhesive dispensers
              (see Motioneering Online, page 219, for information about sizing)  Wafer handling process   PC board inspection, drilling
            2.  Use the motor selection guide on pages 84-86 to choose your motor  Wafer-inspection
            3.  Refer to the appropriate pages in the data publication for technical details  Wafer slicing   Other applications include:
            4. Build model number for ordering using pages 78-80 of the Direct Drive  Tab bonding   Flight simulators
              Linear Motor Selection Guide                     Wire bonding          Acceleration sleds
            Smooth Operation and Positional Accuracy           Ion implantation      Catapult                           T
            Both ironless and ironcore motors exhibit very smooth motion profiles   Lithography   G-Force measurement   OR
            due to the inherent motor design of Kollmorgen's DDL series. Cogging,   Textile
            which is a component of force, is greatly reduced in the ironcore designs   Carpet tufting
            and is zero in the ironless designs. As a result, these direct drive linear
            motors provide very low force and velocity ripple for ultra smooth motion.
            Positioning accuracies are limited only by the feedback resolution,
            and sub-micron resolutions are commonly achievable.

            Unlimited Travel
            With the DDL motor series, magnet ways are made in 5 modular sections:
            64 mm, 128 mm, 256 mm, 512 mm and 1024 mm long. Each module can
            be added in unlimited numbers to any other module to allow for unlimited
            travel. Whether the travel required is 1mm (0.04 inches) or 100 meters
            (330 feet), the DDL series can accommodate the need.

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