| 摘要 |
Disclosed is a rotational speed sensor comprising a rotatable ring. The rotational speed sensor has K magnetic pole pairs distributed angularly over the rotatable ring. Also, sensors are positioned relative to the rotatable ring such that a varying magnetic field is detected. The sensors comprise a first pair being positioned 2piL/K radians apart. The sensors further comprise a second pair being positioned 2piM/K radians apart. The first pair of sensors and second pair of sensors are positioned at a relative position of (2pi/K)*((2n-1)/2 radians. L, M are integers between one and K and n is an integer greater than one.
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