Brushless motor

Abstract

A brushless motor has a rotor magnet integrated with an output shaft. The armature coil unit is comprised of an integral number of coil blocks superposed with one another. Respective coil blocks have a displacement angle of X.sub.M =360.times.M/n degrees relative to a reference coil block, wherein X.sub.M denotes the displacement angle of the Mth coil block relative to the reference block, M denotes a positive integer from 1 to n-1 (the Mth coil block relative to the reference block), and n represents the number of coil blocks and is an even integer having a value of 4 or more. Each coil block shares a center angle of X.sub.2 +360/P degrees, wherein X.sub.2 denotes the displacement angle of the second coil block relative to the reference block, and P denotes the number of poles of the permanent magnet. The coil blocks are connected in series to form respective phases of the armature coil blocks such that the armature coil blocks of each phase pass an electric current in the same direction. By this construction, the brushless motor has an even number of coil blocks superposed with one another at a predetermined displacement angle and, as a result, the brushless motor can produce a higher output torque through a series connection of coils and has a reduced number of junction nodes as compared to a motor utilizing a parallel connection.

Dependencies are inferred from the claim text.