Calibration method for rotation angle sensor

A calibration method for a rotation angle sensor for an electric motor,

• the electric motor including:
• a stator coil including coils of a U phase, a V phase, and a W phase;
• a motor rotor to be rotated by excitation of the stator coil;
• a motor shaft to be rotated in conjunction with the motor rotor;
• and
• a rotation angle sensor configured to detect a rotation position of the motor shaft,
• the method comprising:
• an excitation step including the steps of:
• exciting a predetermined single-phase coil or a first pair of coils including predetermined two-phase coils out of the coils of the stator coil, to thereby rotate the motor shaft to a first rotation stop position;
• and
• exciting a coil different from the predetermined single-phase coil or a second pair of coils different from the first pair of coils, to thereby rotate the motor shaft to a second rotation stop position;
• a rotation-position detection step including the steps of:
• acquiring a detection value of the rotation angle sensor at the first rotation stop position;
• and
• acquiring a detection value of the rotation angle sensor at the second rotation stop position;
• and
• a sensor-error correction parameter generation step of generating a sensor-error correction parameter for correcting a detection value of the rotation angle sensor in drive control of the electric motor, from the detection values of the rotation angle sensor acquired in the rotation-position detection step.