Archive for the ‘Linear Motor’ Category

Baldor LMDS – Dual Axis Linear Stepper Motor

The open-loop linear stepper motor provides the most economical linear motor positioning package. The compact dual-axis stepper motor provides travel along two axes in a single plane. The dual axis package is comprised of two components: a moving forcer (with bearings) and a stationary platen. A position verification system is available to close the loop.

The dual-axis linear stepper motor is designed for two-axis open loop positioning. It is a two axis stage with integrated air bearings and positioning system and offer very high levels of positioning performance. They are capable of move speeds of up to 1.5 metres/second at resolutions to 2.5 microns and with a repeatability of better than 2 microns. They also offer friction-free mechanics with zero-backlash and no wind-up — for a major performance improvement over traditional mechanical transmission design technologies, as well as maintenance savings. The bases are available in a choice of seven standard sizes with square or rectangular working areas ranging from 375 x 375 to 750 x 1500 mm.

The moving primary 2 or 4-phase dual-axis linear stepper motor consists of a moving forcer and a stationary platen. The forcer is made of four single-axis coil assemblies. Two of the forcer assemblies are mounted in series to provide a thrust in the X direction and the other two are mounted orthogonal (at 90 deg.) to the first two assemblies to provide thrust in the Y direction. The forcer assemblies are encapsulated in a hard anodized aluminum housing. The motor’s surface is lapped to provide a flat surface for the air bearing. The floating height of the air bearing is less than 25 µm [0.001 in]. The forcer is available in eight sizes, depending on the application’s
force requirements.

The platen is a photo-chemically etched steel plate that is filled with epoxy and ground. Standard mounting holes are provided on forcer and platen. The platen is available in sizes up to 0.24m x 0.34m [36 in x 59 in]. Preload for the bearing system is provided by the magnetic-attractive force between the forcer and the platen. The customer must bring power to the forcer with a cable, and provide the bearing air supply.

Features:

• Two-axis motion in a single plane
• Acceleration to 19.6 m/s2 [2g]
• High repeatability 5.08 µm [0.0002 in]
• Flatness = 12.7 µm/300 m [0.0005 in/ft.]
• Resolution = Full Step, Number of microsteps: 2-phase min. 5 µm [0.0002 in], 4-phase min. 2.5 µm [0.0001 in]
• Platens up to 914 mm x 1,498 mm [36 in x 59 in]
• For open position loop systems
• No tuning necessary
• Multiple forcers with overlapping trajectories on a single plate
• High stiffness air bearings
• Mount face up or inverted.
• Required drive: Microstepping drive
• Lowest cost dual-axis positioning stage

For further details please check out the Baldor Linear Motor & Stage Product Brochure