Sensor device for high speed rotating machine

A sensor device for a high speed rotating machine, comprising:

• a rotating body, including a magnetic permeable ring and at least one positioning structure, the magnetic permeable ring further including a radial displacement sensing area and a rotational speed sensing area, the at least one positioning structure being disposed in the rotational speed sensing area, a surface of the at least one positioning structure being different to a surface of the magnetic permeable ring;
• a sensor assembly, including:
• four radial displacement sensors, disposed separately around the rotating body, each of the four radial displacement sensors being disposed in correspondence to the radial displacement sensing area, each of the four radial displacement sensors being separated from the magnetic permeable ring by a radial air-gap spacing, wherein each of the four radial displacement sensors is a double-probe type sensor;
• and
• two rotational speed sensors, disposed separately around the rotating body, each of the two rotational speed sensors being disposed next to one of the four radial displacement sensors in correspondence to the rotational speed sensing area, wherein each of the two rotational speed sensors is a four-probe type sensor;
• and
• a non-magnetic base located outside the rotating body;
• wherein the double-probe type sensor includes a magnetic metal block, two coils, and two probes substantially parallel to each other, where the two coils are separately disposed to surround the magnetic metal block;
• wherein the four-probe type sensor includes another two double-probe type sensors and an intermediate another magnetic metal block connected with and disposed between the another two double-probe sensors;
• wherein the two rotational speed sensors and the four radial displacement sensors are separately disposed at the non-magnetic base.