ROTATIONAL ANGLE DETECTOR AND ITS TEMPERATURE CORRECTING METHOD

摘要

A first sin phase voltage representative of the rotational angle of a resolver is derived from the sum of a rotational angle voltage having a temperature element and a bias voltage. The rotational angle voltage and the bias voltage are determined by subtracting or adding the values of rotational angle of a rotor at the maximum peak point (theta=90˚) and the maximum bottom point (theta=270˚). The trans former efficiency K(T) and the phase difference alpha(T) of the rotational angle voltage having a temperature element, and the impedance R(T) and the phase difference beta(T) of the common earth line of the bias voltage having a temperature element are then determined. The rotational angle is determined by substituting them into an expression for determining the first sin phase voltage. According to the arrangement, rotational angle of the rotor can be detected with high accuracy without being affected by temperature variation.