Angle detection apparatus, motor driving control apparatus and angle detection method

An angle detection apparatus comprising:

• a plurality of sensors placed at predetermined positions with respect to a rotation shaft and configured to output a plurality of signals having amplitudes periodically changing according to a rotation of the rotation shaft and having phases different from each other according to the predetermined positions;
• a vector generation part configured to derive a vector having a phase that changes according to the rotation of the rotation shaft based on the plurality of signals that are output by the plurality of sensors;
• an angle search part including a vector rotation part configured to rotate the vector differently from the rotation of the rotation shaft, a comparison part configured to compare the vector rotated by the vector rotation part with a predetermined phase and output a rotation amount determination signal according to a result of the comparison and a rotation amount determination part configured to determine, according to the rotation amount determination signal, a rotation amount by which the vector rotation part rotates the vector, the angle search part being configured to acquire the rotation amount determined by the rotation amount determination part as a rotation angle of the rotation shaft by repeating a process of the rotation amount determination part determining, according to the rotation amount determination signal, the rotation amount by which the vector rotation part rotates the vector and a process of the vector rotation part rotating the vector according to the rotation amount determined by the rotation amount determination part;
• and
• a rotation angle change signal generation part configured to generate, based on the rotation amount determined by the rotation amount determination part, a rotation angle change signal for acquiring a state of a change of the rotation angle of the rotation shaft, wherein
• the rotation amount determination signal that is output by the comparison part is a signal indicating to increase or decrease a fixed amount for increasing or decreasing, according to the result of the comparison, the rotation amount by which the vector rotation part rotates the vector.