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Hall-effect Sensors vs Anisotropic Magnetoresistance AMR Sensors
Hall-effect Sensors vs Anisotropic Magnetoresistance AMR Sensors
Honeywell
4 April 2019
Magnetic sensors have been a staple for many years in various applications. They convert magnetic or magnetically encoded information into electrical signals for processing by electronic circuits.
In automotive systems alone they’ve been used for the sensing of position, distance and speed. For example, the position of the car seats and seat belts for air-bag control or wheel speed detection for the anti-lock braking system (ABS).
Hall-effect sensors in particular have been used for applications in detecting speed, position, and direction of travel for a target. But the newer kids on the block - Anisotropic Magnetoresistance (AMR) Sensors - are giving them a run for the money.
AMR sensors:
- Have higher sensitivity than Hall Effect sensors
- Are triggered by either a north or south pole (omnipolar sensing)
- Have increased resolution when using a ring magnet with the same number of poles as Hall Effect sensors
- Have the same resolution as Hall Effect sensors with a much larger air gap, even with a reduced number of poles
On the other hand, Hall-effect sensors have a proven track record in applications requiring tighter operating characteristics. And for applications requiring flexibility, external circuitry has allowed it to operate outside perceived parameters.
Both sensor types continue to offer non-contact, wear free operation, low maintenance cost, robust design, and immunity to vibration, dust, and water.
So … which do you choose for your application? Maybe taking a look at the individual technologies will shed some light.
Hall-effect sensors respond to magnetic fields perpendicular to the sensor. AMR sensors respond to parallel fields, and react to both magnetic poles.
Or, with a slightly different view, you can see the AMR comes with an inherent range of applications and detection area that Hall-effect sensors can only achieve with additional circuitry.
The right sensor housing designed for the right application makes for an unbeatable, durable, long-lasting solution.
The design flexibility of the AMR Sensor, because of its ability to detect a horizontal magnetic field and omnipolar sensitivity, means you can provide the magnetic fields in many ways.
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