Method of calculating compensation value for angle detecting sensor and angle detecting sensor using the method

A method of calculating a compensation value for an angle detecting sensor including a sensor unit that generates a rotating magnetic field in accordance with rotation of an object to be measured and that detects the rotating magnetic field to output a plurality of output signals in accordance with an input angle of the rotation;

• a signal converting section that converts the plurality of output signals into two signals having a predetermined phase difference;
• a signal adjusting section that adjusts offsets and gains of the two signals;
• an arithmetic operation section that calculates a rotation angle of the object from the two signals after the adjustment as an output angle before compensation;
• a memory section in which the compensation value used for compensating for a total error signal included in the output angle before compensation is written in advance;
• and a compensator that removes the compensation value from the total error signal included in the output angle before compensation to calculate an output angle of the object, the method comprising:
• a first step of generating the two signals having the predetermined phase difference from the plurality of output signals;
• a second step of calculating the rotation angle of the object from the two signals as the output angle before compensation;
• and
• a third step of extracting a candidate signal having a minimum residual energy in the signal after removal as the compensation value when a plurality of candidate signals having the same period but different amplitudes has been removed from the total error signal included in the output angle before compensation.