| 摘要 |
PROBLEM TO BE SOLVED: To obtain a motor controller capable of energizing coils in respective phases with appropriate timing at low cost. SOLUTION: When a sensor magnet installed coaxially and integrally with a rotor is rotated, change in the surrounding magnetic fields is detected by a Hall IC element 78A. Based on the result of the detection of change in the magnetic fields by the Hall IC element 78A, a speed control computation portion 48 calculates the cycle of rotation of the rotor, and the calculated cycle of rotation of the rotor is divided into six. Based on the difference between the divided value and a set value, the timing of energization of coils 30A to 30C is set. Thus, the number of rotations of the rotor is corrected based on the result of detection by one Hall IC element 78A, and the influences of error in the installation positions of other Hall ICs 78B and 78C are thereby made negligible. |
