Tuesday, 15 October 2019
LIFTjournal Logo

The standard for gearless drives

Gearless drives, also known as direct drives, are used in lift technology. This is due to their high torque at low speeds and smooth, quiet running properties. This places special demands on the encoders used.


The encoders found in gearless drives require short control cycles, high resolution and reliability. It is precisely these characteristics that make the Motor-Line optical Sendix 5873 single-turn encoder version the ideal solution for direct drives. Choosing the right sensors is also decisive.

Reliable and precise

The Sendix 5873 Motor-Line encoder is very reliable and precise. The hollow shaft with central screw and screw locking device connects the encoder and drive shaft securely. The encoder with stator- or expander coupling and tangential cable output is fitted with an optionally preconfigured plug for easy and optimal installation.

The basis of all Sendix encoders is their sturdy construction and robust bearing structure in Safety-Lock™ design. This not only provides protection in the event of installation errors, but also against shock and vibrations during permanent operation. This guarantees a long encoder service life and reliable use in the lift.

The encoders have been provided with fast and easy start-up through plug and play, electronic data sheet and determination of the rotor position of the direct drive by means of the absolute single-turn information. In terms of the measuring system this means it can be set to a predefined position value.

Fully digital BiSS interface

High encoder precision is especially important for maximum travel comfort. The high control quality of the Sendix 5783 Motor-Line encoders is an advantage here. The fully digital BiSS interface with a resolution of 21 or 17 bits and additional 2048 sine/cosine periods per revolution ensure optimal control of the drive. There are also product versions available for converters with an SSi interface.

The BiSS interface is a fully digital and bidirectional connection for absolute measuring systems. Consequently BiSS is ideally suited for dynamic axes with very high acceleration, even speed control and the best possible positioning precision.

The great advantage of the BiSS interface is an open source protocol for sensor, converter and drive, which provides high speeds (data rate up to 10°MHz) and running time compensation for optimal operation of the drive system. A licensed interface does not decide on the selection of the components, but instead solely the requirements of the applications, resulting in greater flexibility and cost efficiency.


nach oben