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Absolute Encoders - Magnetic

Our Absolute rotary encoders are manufactured by our business partner, FRABA POSITAL GmbH.   FRABA POSITAL GmbH has been a leading manufacturer of absolute rotary encoders for over 30 years.

Absolute rotary encoders are capable of providing unique position values from the moment they are switched on as well as immediately after a power loss. This is accomplished by scanning the position of a coded material. All positions in these systems correspond to a fixed code. Even movements that occur while the system is without power are translated into accurate position values at once when the encoder is powered up again

Measuring Principles - Optical encoders are made up of a revolving shaft with a code disc and an optoelectronic scanning unit consisting of a screen and photoreceptors. Infrared light from an LED source passes through the code disc and the screen behind it. At every angle position a different sequence of photoreceptors are blocked from light by dark segments on the code disc.

The Singleturn Measuring Principle - The MAGNETOCODE (MCD) series use Magnetic rotary encoders determine positions using the Hall effect sensor technology developed for the automotive mass market. A permanent magnet fixed to the shaft generates a magnetic field that is sampled by the Hall sensor, which translates the measured value into a unique absolute position value.

The Multiturn Innovation -  To register revolutions even when no voltage is applied, energy from the turning of the shaft must suffice for proper operation. An innovative, patented technology makes this feasible even at low rotational speeds and through long standstill periods – a Wiegand wire ensures that the magnetic field can
only follow the turning of the shaft in discrete steps. A coil wound on the Wiegand wire receives only brief, strong voltage spikes, which prompt the reliable
recognition of each revolution.:

Specifications: - Given their small diameter of 36.5 mm, MAGNETOCODE (MCD) encoders with a serial interface can also be used in applications with very limited installation space. They are available as hollow or solid shaft versions with a 12 bit (4096 steps) resolution per revolution. The measurement range of
8192 revolutions can be extended upon request. Absolute rotary magnetocode encoders range:

• SSI
• CANopen