Fafnir Encoder Survivors measure speed and position of rotating shafts while providing the functions of a housed bearing. The units are available in pillow-block and flanged designs with two and four-bolt configurations and setscrew shaft retention. A new family of encoders provides speed sensing and bearing performance for tough industrial applications. Fafnir Encoder Survivors, from The Torrington Co., Torrington, Conn., integrate bearing and sensing functions in a housed unit to simplify system design and reduce maintenance and assembly costs. The design, based on technology developed for automotive ABS applications, eliminates the need for an extra gear-tooth sensor or rotary-pulse generator. Simple bolt-on installation requires no extra brackets or couplings, and the air gap reportedly can't go out of adjustment. The sensors are built on Fafnir Survivor PT bearing platforms, which resist corrosion in washdown, steam cleaning, and contaminated environments. The units work on the principle of the Hall effect. Hall sensors are solid-state powered devices that provide an output signal proportional to the strength of a nearby magnetic field. A magnetic pulser ring with alternating north and south poles is placed near the Hall element inside the bearing seal. When the ring spins, the waterproof Hall sensor provides an output signal that determines the speed (and position) of the ring. A single or dual Hall-effect sensor brings the signal out to a waterproof industrial-grade "green-box" enclosure. A small circuit board inside the box converts the Hall signals from analog to digital form and filters out electrical interference. Single Hall sensors generate single digital output. Dual sensors provide signals that double the resolution and can detect the direction of rotation. The resultant electrical signal is identical to that supplied by digital gear-tooth sensors, which are widely used in industry to measure shaft position and speed. The generated square wave is then available
Products & Services
Hall Effect Position Sensors
Hall effect position sensors are non-contact devices that convert energy from a magnetic field into an electrical signal. They use the Hall effect, a voltage caused by current-flow in the presence of a magnetic field.
Magnetic Speed Sensors
Magnetic speed sensors rely on a magnet as the sensing element or sensed target to capture rotational or linear speed. They are typically used as gear tooth speed sensors or incorporated into stroboscopes or tachometers.
Rotary Position Sensors
Rotary position sensors include potentiometers, resolvers and a variety of magnetic and capacitive technologies. Sensors are designed for angular displacement less than one turn or for multiturn displacement.
Linear Position Sensors
Linear position sensors is a general search form for all linear position / displacement detection product areas.
Proximity sensors, all types is a general search form for all proximity sensors and presence detection product areas.
Topics of Interest
A common approach to measuring distance or angle in a rotating system is by using an incremental encoder or resolver. The majority of industrial applications, such as machines or drives, are dominated...
Invensys Sensor Systems, El Paso, Tex., (Clarostat Div.) has developed a rotary Hall-effect position sensor, the HRS100, that cuts cost by integrating all compensation circuitry into a single...
The newest current sensor family from Allegro MicroSystems, Inc., the ACS704, is the first SOIC8-packaged Hall-effect current sensor with the current path integrated into the package for greater...
As the name states, brushless DC (BLDC) motor work on conventional Direct Current (DC) voltage without any brushes. Commutation is done electronically for these type motors. The three types of devices...
Magnetic field sensors are generally based on the magneto-resistive or Hall-principle. Compared to optical speed sensors, resolvers and precision potentiometers, magnetic field sensors do not contain...