| 摘要 |
PROBLEM TO BE SOLVED: To continuously detect the rotor position of a motor having a rotor fitted with a plurality of magnetic poles composed of permanent magnets, without having to use expensive encoder. SOLUTION: The position of a rotor is detected continuously by arranging the rotor 5 formed so as to have for example eight poles MP1-MP8 by permanent magnets 10, a stator 11 having magnetic legs ML1-ML9 of, for example nine slots, counterposed to this rotor 5, an analog Hall element 13A which is arranged at a position opposed to the magnetic poles MP1-MP8 of the rotor 5, and outputs an analog magnetic detection signal, and an analog Hall sensor 13B which outputs an analog magnetic detection signal, whose phase is difficult from that of the signal of the Hall sensor 13A by 90 deg., or a digital Hall sensor which outputs a digital magnetic detection signal composed of a binary signal, and performing comparison of the magnetic detection signals which have a phase difference of 90 deg.. |
