| 摘要 |
PROBLEM TO BE SOLVED: To enable generation of an energization signal waveform with a magnet of simple shape not using a flange and acquisition of a PG signal without using an exclusive PG magnet, while keeping the number of pulses of FG signal. SOLUTION: The FG poles 31f which are equal to the doubled drive poles 31a are detected by a plurality of Hall elements 18a, 18b, 18c and output frequencies thereof are respectively divided to 1/2 to obtain the energization signal waveform. The phases of the energization signal waveform and the inverse electromotive force waveform are compared. When these phases are inversed with each other, it is assumed that the motor is rotating in the inverse direction and the phase of the waveform after frequency division to 1/2 is set to change 180 degrees. |
