Products

Trade Shows


Hall 5, Booth 414
30.05. - 01.06.2017

 

Contact:

Germany / General
André Huntrieser
✆: +49 (0) 2129 - 376-202
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Field Applications Engineer
Günter Fuchs
✆: +49 (0) 2129 376-200
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Tech Support
Raphael Balke
✆: +49 (0) 2129 376-200
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Austria / Switzerland
Karl Eder
✆: +43 (0) 7448 - 21643-11
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Gear-tooth / Speed Sensors

 

 

The need to sense speed and position of ferrous gears occurs in numerous applications. In order to detect the passing gear-teeth with a Hall Effect sensor it is necessary to provide a source of magnetic energy. The simple way to do this is to arrange a permanent magnet so that the axis of magnetization is pointing toward to surface of the gear-teeth. As a tooth moves across the surface of the magnet the flux will become attracted to the lower reluctance path provided by the ferrous steel structure. When this occurs the flux density measured by the Hall element between the face of the sensor and the gear-tooth increases. If the signal level changes beyond the preset magnitude from the positive or negative peak, the output level is changed. This creates a digital zero speed peak detection speed sensor. It is immune to orientation requirements and can follow the gear speed down to the cessation of motion.
It will detect the first edge of the next tooth immediately after power on.
Melexis has chosen to work with digital signal processing schemes and in this way minimize the magnetic circuit manipulation required by the end user.

 

Product

Function

Output

Benefits

Package

Datasheet

MLX90217

Speed Gear-tooth, Camshaft Sensing

Open Collector Switch

VDD range from 3.5V to 24V,
Factory programmable parameters,
Hysteresis from 1.8 to 10mT,
Hysteresis 3.8 12mT

3L TO-92

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MLX90254

Differential Speed, Crankshaft Sensing

Open Drain Switch

VDD range from 4V to 24V,
Simultaneous Speed and Position Sensing,
Large Airgap range,
Detection frequency 15Hz to 30Hz

Thin 4L
TO-92 flat

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