| 摘要 |
PURPOSE:To obtain a driving circuit for brushless motor which can drive a brushless motor positively. CONSTITUTION:A rotary pole 28 is mounted on the outer periphery of the shaft 14 of a brushless motor 10 rotatably therewith and trans-sensors 16, 18 formed by bending juxtaposed primary and secondary coils into saddle shape, are disposed in the vicinity of the shaft 14 such that they make an angle of 120 deg. around the shaft 14 and the rotary pole 28 passes through an air gap 26. Variation of inductance of the trans-sensors 16, 18 due to passage of the rotary pole 28 is detected and a plurality of driving coils in the brushless motor 10 are conducted based on the detection results. |
