Brushless dc motor

A brushless DC motor, wherein the rotor (1) having a motor shaft (4), a rotor yoke mounted on the motor shaft (2) on (4), and a magnetized ring magnet (3), the magnet a plurality of magnetic poles in the circumferential direction, and the rotor yoke (2) is held in place. The stator has a first and a second stator yoke (5,6). A main magnetic pole of the stator yoke (13 or 14) each extending radially from the center, and the magnetic pole attachment (21, 22) respectively, from the front end of the main magnetic pole (13 or 14) along a ring-shaped magnet (3) the inner circumferential surface extending in the vertical direction. Another surrounding the motor shaft (4) of the central yoke (7) is used in a magnetic circuit connecting said first and second stator yokes (5,6), having an annular winding (8) of the winding assembly (12 ), and a printed circuit board (11), on which is mounted the annular winding (8), electromagnetic conversion element (9) and a drive circuit.