MR-Sensors

Where do you use MR-sensors?

MR-sensors, evaluation electronics and magnetic scales from Sensitec are in use everywhere, where movement is being controlled and steered, where paths, angles, positions, electric or magnetic fields are measured and detected.

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What is the MR effect?

The MagnetoResistive Effect, "MR-Effect", has been known for 150 years. However, its use in sensor applications was first made practically possible through the development of thin-film technology some 30 years ago.

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You will find us

… at the following exhibitions and fairs.

Our exhibition team is looking forward to presenting you our new products and innovations and to giving you technical advice for your individual measuring application.

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DRIVE SYSTEMS

The demand for measurement systems providing high resolution and highly dynamic response is leading to a dramatic increase in the use of MR sensors in drive systems and components. The inherent robustness of MR sensors allows their use in demanding environments (high/low temperatures, high humidity), where other sensors don't work or don't last.

Typical applications

  • Integrated rotary encoder for torque motor
  • Linear encoder for direct drive motor
  • Shaft-end encoder for compact motor
  • Integrated rotary encoder for servo motor

APPLICATION EXAMPLE: BALL BEARING WITH INTEGRATED ENCODER

Requirements

An incremental encoder is to be integrated within the housing of a ball bearing. The encoder shall provide a resolution of at least 1,25°.

Key Specifications

Measurement distance:
40 mm
Resolution:
72 A and B periods (288 quadcounts representing 1,25°)
Accuracy:
< 2°
Temperature range:
-20 °C up to +120 °C

Solution from Sensitec

A GLS0712 GMR sensor is used to scan a gear wheel with 72 teeth. A comparator is connected directly to the Wheatstone bridge for signal conditioning.

Why use MR sensor technology?

  • Simple assembly and adjustment
  • No further calibration necessary after final assembly
  • A and B signals with 90° phase shift are generated by a single sensor element