A NOISE REDUCTION ARRANGEMENT RELATED TO A THREE-PHASE BRUSHLESS MOTOR

摘要

An object of the present invention is to effectively reduce noise generated when driving a three-phase brushless motor. A noise reduction arrangement applied to a three-phase brushless motor is disclosed, wherein respective current loops, which are generated when two switching elements Q1 and Q2 related to U-phase are turned on or off in reversed phase with respect to each other, are opposed to each other in a direction of the normal to a board; respective current loops, which are generated when two switching elements Q3 and Q4 related to V- phase are turned on or off in reversed phase with respect to each other, are opposed to each other in a direction of the normal to the board; and respective current loops, which are generated when two switching elements Q5 and Q6 related to W-phase are turned on or off in reversed phase with respect to each other, are opposed to each other in a direction of the normal to the board.