| 摘要 |
A coreless motor has a permanent magnet integrated with a casing, a commutator, and a rotor coil unit integrated with an output shaft. The rotor coil unit is comprised of an integral number of coil blocks superposed with one another. Respective coil blocks have a displacement angle of XM=360xM/n degrees relative to a reference coil block, wherein XM denotes the displacement angle of the Mth coil block removed from the reference block, M denotes a positive integer from 1 to n-1 (the Mth coil block removed from the reference block), and n represents the number of coil blocks and is an odd integer having a value of 3 or more. Each coil block shares a center angle of X2+360/p degrees, wherein X2 denotes the displacement angle of the second coil block removed from 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 rotor coil blocks such that the rotor coil blocks of each phase can pass an electric current in the same direction. By this construction, the coreless motor has an odd number of coil blocks superposed with one another at a predetermined shift angle, and, as a result, the coreless 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.
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