| 摘要 |
<p>A rotation speed detecting apparatus using an inductive high-frequency magnetic field is provided to allow a driver to smoothly perform the ABS(Anti Lock Brake System) operation and car control in braking a car by preventing an error in detecting the speed of a rotation body. A rotation speed detecting apparatus using an inductive high-frequency magnetic field includes a rotor and a rotation speed detecting sensor(100). The rotation speed detecting sensor includes an LC(Inductor-Capacitor) oscillation circuit(112), a detection circuit(116), an integration circuit(118), and an output circuit(122). The LC oscillation circuit includes a coil(114) generating the inductive high-frequency magnetic field in the direction in which the rotor is positioned. The detection circuit detects the change of a magnetic flux of the inductive high-frequency magnetic field generated from the coil. The integration circuit outputs a DC magnetic flux for the amplitude of the magnetic flux detected by the detection circuit. The output circuit outputs a voltage or current corresponding to the strength of the DC magnetic flux outputted by the integration circuit.</p> |
