| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a dead angle and a sudden torque when a multiphase motor is started by a method wherein two sets of magnetic induction sets, a motor magnet and a control circuit constitute the multiphase motor. SOLUTION: Respective magnetic induction sets 1, 2 comprise two sets of magnetic pole pieces 11, 12, 21, 22 and one set of coils 13, 23. A nonmagnetic induction layer 3 is formed between the magnetic induction sets 1, 2 in two sets. Then, the magnetic pole pieces 11, 12, 21, 22 at the magnetic induction sets 1, 2 are formed in such a way that their positions are fixed so as to become a mechanical angle phase difference. A rotor magnet 4 comprises a plurality of pairs of magnetic poles coaxially with the magnetic induction sets 1, 2. In a control circuit, a two-phase current waveform output is controlled, two sets of Hall detecting elements 51, 52 are installed, and the exciting current of the coils 13, 23 is controlled. In addition, the Hall detecting elements 51, 52 are formed in such a way that their positions are fixed so as to become a mechanical angle phase difference. Then, on the basis of a time difference in which the Hall detecting elements 51, 52 detect a change in the magnetic field of the rotor magnet 4, the magnetic induction sets 1, 2 are formed in such a way that their exciting currents become a fixed electric angle phase difference. |
