Wiegand sensors are used as a pulse generator in multiple applications. The sensor needs no external power source and has no moving parts. Instead, it exploits the properties of a small diameter wire invented by John Wiegand.
When a magnetic field changes the magnetic state of the Wiegand wire within the sensor, a substantial output pulse is produced which can be used as a power source in an energy self-sufficient revolution counter..
Wiegand sensor products from POSITAL reflect the knowledge from a full decade of experience using Wiegand-effect base revolution counters. The high performace sensors are assembled using SMD mounting technology and can be used for revolution counters in absolute rotary encoders as well as in other applications, e.g. gas or water meters.
Wiegand sensors are used as a pulse generator in multiple applications. The sensor needs no external power source and has no moving parts. Instead, it exploits the properties of a small diameter wire invented by John Wiegand.
POSITAL multiturn encoders have been succesfully using Wiegand sensors since 2006. This energy harvesting system generates short, powerful voltage pulses sufficient to power the rotation-counting electronic circuit, even when the speed of rotation is very low. This solution enables the reliable measurement of multi-turn absolute positions without requiring access to an external power supply.
The Wiegand effect technology employs the unique magnetic property of specially processed, small ferromagnetic wire. John Wiegand discovered a way to cause the magnetic field of this specially processed wire to suddenly reverse. When the magnetic field of this wire, called a Wiegand Wire, is reversed a sharp uniform voltage pulse can be generated. The pulse is referred to as a Wiegand Pulse.