Direct drives

Extremely Slow Turning Drive

The Challenge

  • Artificial production of silicon is important because of the limited amount of natural crystal, and because they are used in numerous products (e.g. solar cells, microchips)
  • Produced in a smelting procedure: Cool germ crystal is dipped into the melt and grows inside this
  • These grow comparatively long, and the crystal is drawn upwards extremely slowly at around 0.008 rpm
  • Drive with an extremely slow and constant speed is necessary
Extrem langsam drehender Antrieb

The Solution by FGB

  • Development of a hollow shaft direct drive that is ideally suited for drawing silicon crystals -> Using the gears would cause fluctuating speeds and therefore lower quality
  • Optimisation of the cogging torque and the bearings
  • Measuring system ideally trimmed to the drive

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