| 摘要 |
PURPOSE:Not to generate a vibration in the winding, by smoothly switching a current in each stator winding, with a conduction angle of each stator winding in the brushless motor made below 180 deg.. CONSTITUTION:Output terminals A, -A and B, -B Hall elements, 110, 111, connected in parallel to a DC power source +E2, are connected to differential amplifiers 112a, 112b, 115a, 115b,116a,116b respectively, with a rotating position of the rotor being detected. Current mirror circuits 114a, 114b are connected to the respective differential amplifier circuits, and collector output currents IA, I-A of a first differential transistor are given to common emitters of two sets of differential transistors 115 and 116, and output currents IA-B, IAB of a second differential transistor 115 and output currents I-AB, I-A-B of the differential transistor 116 are made while switching at every 90 deg. to stator windings 121a to 121d through transistors 120a to 120d, to successively and smoothly control a stator current. |
