drive system - FAULHABER - DC Motors & Micro Drive Systems
motors. The result: high-precision technology in the smallest possible space.
In the basic version, available as Varioscope
AF3, drive system drive system - FAULHABER - DC Motors & Micro Drive Systems users can move freely in a
working distance of 300 to 600 mm. The foot-operated Change System Drive Letter in Windows XP zoom function allows infinitely variable magnification from 3.6 to 7.2. The
field of vision is 30 to 144 mm, and the pupillary distance can be drive system individually adjusted to each
user. The M5 design provides an extendible modular optical system.
Changeable oculars extend the magnification range, and
integrated lighting addresses the problem of shadows. An extended possibility of adjustment for individual eye data is a particularly user-friendly solution. With an
optional video camera, procedures carried out drive system by the user can be precisely recorded. Thus, lifeoptics has come up with a scalable solution tailored to a range of different requirements. And, thanks to its ingenious design, the drive system device can be effortlessly transported from one workplace to another.
The Varioscope AF3
Precision in the smallest of spaces
The Varioscope M5 drive system design
The heart of the mechanics
This highly complex yet portable system relies to a large extent on state-of-the-art micro-stepper motors. Unlike DC motors, stepper motors move on per pulse at drive system a step angle dependent on their specific design. Thus, the number of digital pulses output always corresponds to a defined rotation. As a result, additional linear or angular position sensors are not required. The construction of the drive is smaller and lighter, and it is simpler to control. The Varioscope microscope requires two motors for each eye. The AM 1020 at a diameter of 10 mm for the focus setting and the AM 0820 at a diameter of 8 mm for the zoom. The focus drive operates more or less continuously, as it has to compensate for every movement of the head.
Vision systems of this size are precision instruments and make particularly high demands on the accuracy of positioning.
The problem of inaccuracies due to "play" in the mechanics was solved by ARSAPE by using a spindle with micro-toothing. With a pitch of 0.2 mm and in conjunction with the built-in motors, it allows a resolution of 10 µm. Both focus and zoom are set absolutely backlash-free and without jolts at high resolution. For this reason, the spindle shafts are also given an additional fine polish, a process which is normally only used in precision watches. In conjunction with a special lubricant, the level of friction is reduced considerably and thus also the initial breakaway torque.
An additional pre-tensioning on the precision ball bearings by disk springs facilitates zero-backlash movement at torques of up to 1 N, a value which never actually occurs in practice.
Mighty minis
Stepper motors are suitable for many – even highly dynamic – positioning tasks. Thanks to carefully selected materials, these miniature units can accelerate up to 1200 rpm in one step and without overshooting.The use of high-quality NdFeB magnets with superior temperature resistance is the key to their performance. Indeed, the motors are able to provide continuous problem-free operation at 70 °C housing temperature for a period of several days – without interruption. In this case, the coil may actually reach a temperature of 120 °C and
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