Apparatus and method for compensating for position error of resolver

An apparatus for compensating for a position error of a resolver, the apparatus comprising a controller configured to:

• receive position information of a rotor of a motor, which is detected by the resolver, to measure a first position error, convert the measured position error to a second position error at an electrical angular velocity of 0, and to store the second position error;
• to receive a current electrical angular velocity and the second position error, convert to a third position error at the current electrical angular velocity, and compensates for the third position error;
• and
• perform a determination of false position error compensation when a root mean square (rms) value of a ripple at an electrical angular velocity, which is measured after the third position error has been compensated for, is equal to or greater than a reference value.

A method for compensating for a position error of a resolver, the method comprising steps of:

• measuring, by the resolver, position information of a rotor of a motor, receiving, by a controller, the measured position information of the rotor of the motor to measure a first position error, converting, by the controller, the first position error to a second position error at an electrical angular velocity of 0, and storing, by the controller, the second position error;
• receiving, by the controller, a current electrical angular velocity and the second position error, performing, by the controller, conversion to a third position error at the current electrical angular velocity, and compensating, by the controller, for the third position error;
• and
• performing, by the controller, a determination of false position error compensation when a magnitude of a ripple at an electrical angular velocity, which is measured after the third position error has been compensated for, is equal to or greater than a reference magnitude.

A method for compensating for a position error of a resolver, the method comprising steps of:

• measuring, by the resolver, position information of a rotor of a motor, receiving, by a controller, the measured position information of the rotor of the motor to measure a first position error, converting, by the controller, the first position error to a second position error at an electrical angular velocity of 0, and storing, by the controller, the second position error;
• receiving, by the controller, a current electrical angular velocity and the second position error, performing, by the controller, conversion to a third position error at the current electrical angular velocity, and compensating, by the controller, for the third position error;
• and
• performing, by the controller, a determination of false position error compensation when a root mean square value of a ripple at an electrical angular velocity, which is measured after the third position error has been compensated for, is equal to or greater than a reference value.