miniature drive system - FAULHABER - DC Motors & Micro Drive Systems
pair of binoculars having a diameter of 23 meters. Each reflector resembles a giant "honeycomb" made from borosilicate glass and weighs 15.6 t.
Interference is miniature drive system miniature drive system - FAULHABER - DC Motors & Micro Drive Systems the key to higher-definition images
The
design of the telescope and its integrated
optical systems provides Welcome to MINIMOTOR - Miniature Drive Systems scientists with a high level of flexibility when making their observations. That way they can use each of
the reflectors independently of one another to view miniature drive system the same object, but also study different objects by tilting
the viewing axes slightly, or use both reflectors to observe
the same object at maximum resolution. They
are assisted by a physical trick:
In order to achieve the unusually high definition, the rays of light reflected by each reflector are superimposed,
miniature drive system i.e. brought to a state of interference. Consequently, the resolution is nearly ten times better than with conventional standalone telescopes. However, the requirement that has to be met to ensure miniature drive system the LBT works smoothly is that individual components made in the three partner countries - the US, Italy, and Germany miniature drive system - interact without any problems. Furthermore, they have to operate properly at the site of use under adverse conditions. After all, Mount Graham is approx. 3,300 m high. The climate miniature drive system at that altitude is characterized by temperatures below freezing, a very high humidity of up to 90%, as well as extreme temperature fluctuations.
Positioning unit for interference generation
If a high-resolution image is to be created by the generation of interference, the optical assemblies that are attached to the two reflectors for bundling and superimposing the reflected light have to be positioned with an accuracy of 5 µm. For this purpose, the Feinmess company in Dresden (Germany) developed a three-axis positioning system (fig. 3) that moves the appropriate optical system on the two reflectors of the LBT into the correct position. Horizontally, distances of up to 200 mm have to be covered (longitudinal positioning), and vertically - for focusing purposes - there are distances of up to 50 mm. At the same time the optical assembly has to be rotated through an angle of up to 36 degrees. In order to ensure the required positioning accuracy, the system has to operate with as little play as possible. That is why great importance is accorded to the drives on the spindles.
In this case, drive solutions from FAULHABER were selected. The traditional bell-type armature motor with coreless rotor coil provides an excellent basis for such fields of application. The small DC drives operate reliably even under hostile ambient conditions. They can cope with ambient temperatures between -30°C and +125°C and are not even affected by a high level of humidity (up to 98%) when specified appropriately. An important basic criterion for motor selection was also instant, high-torque starting for the DC motor after application of voltage. That ensures a direct response to control signals. The coreless copper coil allows an extremely lightweight motor design with a high efficiency of up to 80%. The motors used on all three spindles of the positioning system have a diameter of 26 mm and are only 42 mm long; at speeds of up to 6,000 rpm they provide a power output of 23.2
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