Torque and rotating speed sensor

A torque and rotating speed sensor for detecting a torque of a rotating shaft and a rotating speed of the rotating shaft, comprising:

• a pair of magnetic recording parts, axially spaced apart from one another on the rotating shaft, each to which a location signal in a circumferential direction of the rotating shaft is to be recorded;
• a pair of magnetic heads, respectively opposed to said respective magnetic recording parts, for recording and reproducing the location signal;
• torque calculating means for detecting the torque applied to the rotating shaft based on a quantity of a phase change caused by a torsion of the rotating shaft between each location signal reproduced by a pair of said magnetic head;
• rpm calculating means for calculating a number of rotations of the rotating shaft based on a frequency of the location signal to be reproduced by one of a pair of said magnetic heads;
• and
• signal recording means for recording the location signal to one of the magnetic recording parts by one of the magnetic heads with a frequency according to a frequency of the location signal reproduced from the other magnetic recording part by the other magnetic head, and for recording the location signal to the other magnetic recording part by the other magnetic head with a frequency according to a frequency of the location signal reproduced from the one of the magnetic recording parts.