| 摘要 |
PURPOSE:To simplify driving device for permitting the driving of 3-phase blushless motor by means of 3 position detectors by subjecting aquare-wave signal obtained by forming a sine-wave emitted by each position detector to a wave-forming treatment. CONSTITUTION:The position detectors 6a to 6c arranged at 60 deg. pitch from the rotation of a quatripole-magnetized magnet at 90 deg. pitch rotating integrally with the rotor of a quadripole motor send out sine-wave signals having a 60 deg. phase difference. These signals are put in the comparators 7a to 7c where their waves are formed into square wave signals in which positive-negative change is made at a 90 deg. period and further are subjected to non-inversional amplification at the amplifiers 8a to 8c and then to an inversional amplification at the amplifiers 9a to 9c, whereupon the portion at which square waves are superposed on each other is interlocked by the subsequent output of amplifier and the outputs of each amplifier become square wave signals having a 60 deg. width. By converting these outputs of the amplifiers into driving signals for blushless motor, the armature is made to generate a predetermined revolving magnetic field. |
