Patent ID: 7383743
Filing Date: 2008-06-10
Classification: F02B,G01P

Abstract:
1. A device for detecting a rotation rate that detects a rotation rate of a rotor that applies a pressure to a fluid based on the rotation, the device comprising: a housing member that is disposed on the external periphery of the rotor; a rotation rate sensor, that detects an eddy current that is generated when the rotor passes through the magnetic field, wherein the rotation rate sensor detects a rotation of the rotor, is disposed opposite to the rotor on the housing member, and generates a magnetic field based on an alternating excitation current; and a slit-shaped concave portion for preventing an eddy current that is formed to extend radially in the housing member as first and second slits from diametrically opposite sides of the rotation rate sensor, wherein each of said first and second slits has a width less than a width of the rotation rate sensor.