TLE4922 Magnetic Speed Sensor: What is the minimum air gap?
Community Translation: TLE4922磁気速度センサー： 最小エアギャップはどのくらいですか？(KA-01300)
In the https://www.infineon.com/dgdl/Infineon-TLE4922-XIN-F-DS-v01_00-EN.pdf?fileId=5546d46258fc0bc1015988a... datasheet the parameter “minimum air gap” is specified and verified at a certain wheel. The reference wheel is mentioned in the datasheet. Due to restrictions of the measurement setup the minimum air gap verified is 0.5mm.
In case of no run out of the target wheel and accurate positioning, a minimum air gap of 0.0mm can work. In the application a minimum air gap of 0.0mm is possible as long as BLR (parameter “Linear Region”) is not exceeded.
Be aware the tooth of the toothed wheel increases flux density and in combination with a strong back bias magnet the minimum air gap might be 0.5mm or even 1.0mm. Typically this should not be an issue since TLE4922 is overmolded by customer mold-compound.