AH-Series Hall Gear Sensors
Product
Introduction
The Series AH Gear Sensor is a self-adjust gear speed sensor that
monitors the movement of titanium-like metals using a Hall chip
internally biased with a magnet and the output is in the form of a
digital sinking current output (open collector). There is only a
single Hall element in the sensor, so alignment problems are out of
concern. The Hall chip and its circuit are sealed in a metal
housing in the form of a probe, which can effectively avoid
electromagnetic interference and moisture. It has a better SNR than
electromagnetic induction sensors and excellent low-speed
performance to achieve "zero-speed" detection. Currently, the
sensors are widely used in the following fields.
Application
â—‹Camshaft and Crankshaft speed / position detection
â—‹ Transfer speed detection
â—‹ Speedometer
â—‹ Anti-lock brake system (ABS system) Industry
â—‹ Sprocket gear speed detection
â—‹ Speed and distance detection
on chain conveyor belts
â—‹ Stop motion detection
â—‹ High-speed, low-cost proximity switches
Principle
The sensor is designed to sense changes in the magnetic field, so
the output state is changed when the magnetic flux density reaches
a certain value. In other words, the mounting position of the
sensor must be adjusted for different gears so that the amount of
change in magnetic field strength sensed by the Hall chip in the
product can be ensured to meet the operating conditions. When the
external gear rotates, the magnetic field strength sensed by the
Hall chip decreases from the maximum value, and the sensor output
state changes from low to high , and it changes into high level
when the absolute value of increment ΔB is greater than 100Gs;
while the sensor output state
changes from high to low when the magnetic field strength increases
from a very small value and it changes into low level when the
absolute value of increment ΔB is greater than 100Gs.
