REDWIRE POSITAL’s new multi-turn kit encoders offer accuracy, dynamic response

October 7, 2019 REDWIRE is news you can use from leading suppliers. Powered by FRASERS.

Posted by Posital-Fraba


The latest innovation from POSITAL, its Hollow Shaft multi-turn kit encoders, is ideal for servomotors, stepper motors,... Read more

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multi-turn kit

Hollow Shaft multi-turn kit encoders are ideal for servomotors, stepper motors, robot joints and more.

The latest innovation from POSITAL, its Hollow Shaft multi-turn kit encoders, is ideal for servomotors, stepper motors, robot joints, and any other position-control applications that require a hollow-centre design to achieve an optimal mechanical layout. Among the advantages of these absolute rotary encoders are accuracy of plus or minus 0.02 degrees and a dynamic response of up to 6,000 revolutions per minute – making them perfect for critical motion-control systems.

Two internal diameter sizes available

These Hollow Shaft encoders each have a self-powered rotation counter that uses POSITAL’s Wiegand energy-harvesting technology. With the Wiegand system, no backup batteries or complex gear systems are necessary, and maintenance costs are substantially lower. Other features and benefits of these multi-turn kit encoders include the following:

  • Slim form factor for motor and machine manufacturers;
  • Two internal diameter sizes available, 30 or 50 millimetres;
  • Capacitive measurement system, which enables high accuracy even in challenging work conditions; and
  • Non-proprietary communications interfaces based on SSI and BiSS C standards.

Each Hollow Shaft kit encoder has two principal components, a stator and a rotor, both of which contain specially shaped conductive surfaces that function as capacitor plates. These are positioned immediately adjacent to each other. When the rotor turns, the patterns of the conductive surfaces change their relative positions, which changes the capacitive coupling in the system. This results in changes to the amplitude and phase angle of a high-frequency electrical signal generated by exciter circuits in the stator and transmitted through the capacitor system. These signal variations are captured and decoded by special ASIC devices to determine the rotor’s angular position to a high level of precision.

A key advantage of these multi-turn kit encoders is their shape: the stator and rotor elements are in the form of thin disks with large central openings, which makes them perfectly suited to servomotors, stepper motors, robotic-arm joints, and other space-limited applications, in which an embedded position sensor fitting around a central shaft or axle is preferred.

POSITAL is the name to trust for up-to-the-minute motion-control technology.

To learn more, contact POSITAL.


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Posted by Posital-Fraba


The latest innovation from POSITAL, its Hollow Shaft multi-turn kit encoders, is ideal for servomotors, stepper motors,... Read more

Contact supplier