With its DM66200H series, FAULHABER is opening up a whole new dimension in performance for motors with internal opening (aperture). As a direct drive, the new hollow shaft motor operates backlash-free and can be integrated into different applications with very limited effort. It achieves impressive performance values in terms of both speed and torque. Its exceptionally wide aperture has a diameter as large as 40 mm! The drive is characterised by low weight and an extremely slim design. Thanks to minimal wear (bearing only), it is ideal for maintenance-free continuous operation.

The DM66200H hollow shaft motor offers a completely new drive solution for applications that require a very large aperture. The rotor runs around the opening and drives the mechanics surrounding this opening directly without the need for a transmission. The tried-and-tested stepper motor technology from FAULHABER is used here. Due to the design, it is extremely energy-efficient and requires neither a brake nor an encoder.

Torque, speed, precision
Despite the large aperture, the moving mass of the rotor remains small, making speeds of up to 2000 rpm possible. The motor reaches a dynamic torque of up to 180 mNm and can move correspondingly large loads. With a high resolution of 1.8° in full-step mode, it can execute positioning tasks precisely in open loop operation.

Originally developed for precision optics applications, the DM66200H hollow shaft motor is suitable for many different application areas. It can be used wherever cables need to be guided through the aperture or in cases where gases, fluids or light signals are to pass through the opening. Apart from the field of optics – e.g. for microscope stages, apertures, zoom lenses, laser beam controls, etc. – it can be used for impellers and prostheses, in robotics as well as for many different control and positioning tasks. Other potential applications are turntables, antennas as well as air and gas extractors.
Superior new approach

There are many other drive technologies with central opening that, in principle, are suitable for the same applications. But they all have certain drawbacks:

  •  In the case of conventional motors with a hollow shaft, the size of the opening is limited. Usually it can be no larger than 11 mm.
  • Torque motors cannot achieve high speeds owing to their large moving mass. They are relatively expensive and prove extremely difficult to integrate into the respective application.
  • Turntables with a central opening require a transmission and complex mechanics. The resulting inevitable backlash needs to be compensated by means of elaborate measures before this type of motor can be used in high-precision applications. This also significantly increases the costs and effort necessary for system integration. Furthermore, numerous wear parts are involved resulting in high maintenance requirements.
  • Hybrid stepper motors with reluctance technology need considerably more volume and weight to achieve comparable performance values.

The new DM66200H drive has none of these drawbacks. Thanks to its stepper motor technology, it is able to achieve an optimum speed-torque balance with minimal weight and volume.

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