Vertical Linear Accelerator Using Linear Motion Technology

Overview

Engineers at Dynamic Structures & Materials, LLC (DSM) have developed this vertical linear accelerator to screen military personnel for visual-vestibular pathology or injury and/or to desensitize those who are subject to chronic motion sickness. The machine simulates the ascending and descending motions of an aircraft using a vertical linear stage directly driven via high force linear motor technology provided by Aerotech's BLMX-502 direct-drive linear motor. The BLMX series “U-channel” brushless linear servomotors offer over 49% greater continuous output force in the same physical envelope than similar models from other manufacturers. The motion capabilities of the DSM system are:

  • 12 ft stroke
  • 2 Hz frequency response
  • 1 g peak acceleration
  • 182 kg (400 lb) total payload
  • ±3 mm position error
  • arbitrary waveform capability

BLMX series motors feature a high-efficiency magnetic circuit design that provides continuous force ratings to 1063 N (239 lb) and peak forces to 4252 N (956 lb). This extremely high level of performance can be enhanced with special high-power magnet options that increase force output.

The BLMX moving forcer coil assembly contains Hall-effect devices, and a thermal sensor, and is constructed of reinforced ceramic epoxy. This ironless design eliminates eddy-current losses that otherwise would limit speed and produce additional heat. The BLMX series nonmagnetic forcer eliminates cogging and magnetic attraction to allow for extremely smooth motion and very tight velocity and position control. These linear motors are ideal for applications demanding the ultimate in force output. BLMX series linear motors are forgiving to align, easy to assemble, and keep the magnetic field well-contained.