Speed sensing system

A method of assembling a speed sensor system, the method comprising:

• affixing a magnetic sensor to a surface;
• fabricating a cylindrical drum to include a plurality of axially extending members disposed circumferentially around a first edge of the cylindrical drum, the plurality of axially extending members having flexibility sufficient to deflect radially outwards away from the magnetic sensor in response to increasing rotational speed of the cylindrical drum;
• and
• rotatably mounting the cylindrical drum around the magnetic sensor, wherein the magnetic sensor generates an electrical output upon each passage around the magnetic sensor of each of the axially extending members, wherein the deflection of the axially extending members operates to regulate voltage outputs of the magnetic sensor.

A gas turbine engine having a speed sensor system, the speed sensor system comprising:

• a magnetic sensor;
• and
• a cylindrical drum rotatable around the magnetic sensor;
• wherein
• the cylindrical drum includes a plurality of axially extending members disposed circumferentially around a first edge of the cylindrical drum;
• the magnetic sensor is configured to generate an electrical output that indicates each passage of each of the axially extending members around the magnetic sensor as the cylindrical drum rotates around the magnetic sensor;
• and
• the axially extending members are adapted to deflect radially outwards away from the magnetic sensor in response to an increased rotational speed of the cylindrical drum wherein the deflection of the axially extending members operates to regulate voltage outputs of the magnetic sensor.