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Variable Reluctance Sensors

Variable Reluctance Gear tooth sensors, often also referred to as magnetic pickups, are two wire sensors that were the dominant form of speed sensor before the introduction of digital Hall Effect Sensors.

These sensors have the benefit of not requiring a power supply as they use the rotating gear teeth to generate an AC sine wave output that the control system measures for tracking speed.

The size of the AC output wave VR sensors produce is dependent on the details of the gear, the proximity to the gear, and the speed the gear is moving. Digital Hall Effect Gear Tooth sensors have replaced this technology in many applications as they are more robust and provide a usable output at low speeds, but variable reluctance sensors are still preferred for some applications.

Sensor Solutions can provide replacement options for many different magnetic pickups. If you cannot find the sensor you need in our Catalog Cross Reference , Contact Us with the part number and we will advise replacement options.

To learn more about non-contact speed sensors such as how they function, see our Applications Notes and Resources.

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