Abstract: A motor coil, which is a metal coil formed by a metal wire, the thickness of the metal wire is gradually decreased from the first end portion of the metal wire to the second end portion of the metal wire and any cross-sectional area of the metal wire is equal. The metal coil is a plural laminated layer of the metal wires forming a spiral shape along a surrounding direction. A motor stator comprises a stator core set having a plurality of teeth and the metal coil being sleeved on the outer surface of each stator core set, so that the first and the second end portion will face toward a motor core portion and outer portion respectively. The metal wire has a polymer layer on the outer surface, and an insulative coating is provided between the polymer layer and the metal wire.

Abstract: A motor stator has an annular stator core, and a plurality of tooth portions spaced on the inner surface of the annular stator core which has a slot formed on each of two sides of each of the tooth portions. Each of the tooth portions has a coil wound and a portion of the coil is located in the two slots of each of the tooth portions. Each of the coils is formed by a metal wire coiled around a bobbin several times from the inner side to the outer side. The bobbin has an inner guide frame and an outer guide frame, both of them have a structure with a bottom plate and a side plate that are arranged vertically so that the coil can be attached to the bobbin to miniaturize the motor stator.