| CPC G01P 3/481 (2013.01) [G01P 13/045 (2013.01)] | 5 Claims |
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1. A rotating direction and rotating speed sensing device, comprising:
a tested unit including a base, an output shaft that is perpendicular to the base, and a toothed disk that is sleeved on the output shaft and that is driven by the output shaft;
a housing disposed on the base, and including a base portion, a mounting recess that is formed on a front side of the base portion proximate to the toothed disk, and four through holes that communicate with the mounting recess and that extend through the base portion; and
a Hall effect sensor disposed in the mounting recess and positionally corresponding to the toothed disk for detecting rotating direction and rotating speed of the output shaft, the Hall effect sensor including three Hall effect sensing elements, a power supply pin, a first pin, a second pin, and a ground pin, the Hall effect sensing elements being spaced apart along a first straight line, the power supply pin, the first pin, the second pin, and the ground pin extending respectively through the through holes, the Hall effect sensing elements detecting the toothed disk and making the first pin and the second pin respectively output a first signal and a second signal when the toothed disk rotates;
wherein the first straight line cooperates with a tangential direction of the toothed disk at a point thereof closest to the Hall effect sensor to form an included angle that ranges in a predetermined angle range, such that a phase shift between the first signal and the second signal ranges from 45 degrees to 135 degrees when the toothed disk rotates;
wherein the included angle between the first straight line and the tangential direction ranges from 63 degrees to 84 degrees; and
wherein the rotating direction and rotating speed sensing device further comprises a circuit board, the Hall effect sensor having a sensing surface that faces the toothed disk, the circuit board being parallel to the sensing surface.
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