BRUSHLESS DC MOTOR

摘要

PURPOSE: A brushless DC(Direct Current) motor is provided to reduce a cogging torque and improve an initial starting performance by arraying an interval between a horizontal junction width and a vertical junction width, asymmetrically. CONSTITUTION: A brushless DC motor is formed with four separative C type permanent magnets(2), a rotator(5), a stator core(1), and a yoke(4). The C type permanent magnets(2) are loaded on the rotator(5). The stator core(1) is formed by combining 9 slots(6). A coil(3) is wound around the stator core(1). The C type permanent magnets(2) are covered by the yoke(4). A horizontal junction width and a vertical junction width of the separative C typed permanent magnet(2) is asymmetrically arrayed among the separative C type permanent magnets(2) and the slots(6) of the stator core(1) in order to reduce a cogging torque generated from a magnetic unbalance. The horizontal junction width and the vertical junction width are asymmetrically arrayed as much as 150 percents.