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KMI15-1 Datasheet(PDF) 7 Page - NXP Semiconductors |
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KMI15-1 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 16 page  1996 Dec 05 7 Philips Semiconductors Preliminary specification Integrated rotational speed sensor KMI15/1 Mounting conditions The recommended sensor position in front of a gear wheel is shown in Fig.15. The distance ‘d’ is measured between the sensor front and the tip of a gear wheel tooth. The KMI15/1 senses ferrous indicators like gear wheels in the ± y direction only (no rotational symmetry of the sensor); see Fig.2. The effect of incorrect mounting positions on sensing distance is shown in Figs 11, 12 and 13. The symmetrical reference axis of the sensor corresponds to the axis of the ferrite magnet. Environmental conditions Due to eddy current effects the sensing distance depends on the tooth frequency (Fig.17). The influence of gear wheel module on the sensing distance is shown in Fig.16. Gear Wheel Dimensions Note 1. For conversion from ASA to DIN: m = 25.4 mm/DP; p = 25.4 mm × CP. SYMBOL DESCRIPTION UNIT German DIN z number of teeth d diameter mm m module m = d/z mm p pitch p = π× mmm ASA; note1 PD pitch diameter (d in inch) inch DP diametric pitch DP = z/PD inch−1 CP circular pitch CP = π/DP inch Fig.10 Gear wheel dimensions. handbook, halfpage pitch pitch diameter MRA964 pitch = module ×π module pitch diameter number of teeth ------------------------------------------ = Fig.11 Sensing distance as a function of positional tolerance in the y-axis. VCC = 12 V; ft = 2 kHz; module = 2 mm; pitch diameter = 100 mm. handbook, halfpage 1 2 4 3 01 2 3 4 0 d (mm) MRA998 d y (mm) y |
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