A vehicle alternating-current generator, comprising: a wound stator, comprising: a stator, having a plurality of radial grooves arranged at an inner circumference of the stator; a plurality of wires for the stator, each wire comprising: a first end; a second end; and a plurality of wave-shaped coils located between the first end and second end, each wave-shaped coil being formed of straight portions and curved portions that alternate with each other; wherein the straight portions of each wire are sequentially embedded in corresponding grooves of the stator, so that each of the grooves is embedded with the wires, and a rotor, comprising a first claw magnetic pole piece and an opposite second claw magnetic pole piece, the first claw magnetic pole piece having a plurality of N pole claw bodies, the second claw magnetic pole piece having S pole claw bodies of the same number as the plurality of N pole claw bodies of the first claw magnetic pole piece, and when the first claw magnetic pole piece and the second claw magnetic pole piece are combined with each other, the plurality of N pole claw bodies of the first claw magnetic pole piece and the plurality of S pole claw bodies of the second claw magnetic pole piece being adjacent to each other and being arranged separately; wherein the rotor is placed in the wound stator in a coaxial form, wherein the straight portions of each wire are, starting from the first end, sequentially embedded in a clockwise direction in the corresponding grooves of the stator to surround the stator, characterized in that; the straight portions of each wire are then sequentially embedded in the corresponding grooves of the stator in a counter-clockwise direction and jut out from one of the corresponding grooves with the second end, so that each of the corresponding grooves has two layers of wires, each layer corresponding to a single wire, and wherein the width of each of the plurality of grooves is sized to receive one wire at a time, so that the straight portions of the wires can be directly embedded into the grooves from the openings. a wound stator, comprising: a stator, having a plurality of radial grooves arranged at an inner circumference of the stator; a plurality of wires for the stator, each wire comprising: a first end; a second end; and a plurality of wave-shaped coils located between the first end and second end, each wave-shaped coil being formed of straight portions and curved portions that alternate with each other; wherein the straight portions of each wire are sequentially embedded in corresponding grooves of the stator, so that each of the grooves is embedded with the wires, and a stator, having a plurality of radial grooves arranged at an inner circumference of the stator; a plurality of wires for the stator, each wire comprising: a first end; a second end; and a plurality of wave-shaped coils located between the first end and second end, each wave-shaped coil being formed of straight portions and curved portions that alternate with each other; wherein the straight portions of each wire are sequentially embedded in corresponding grooves of the stator, so that each of the grooves is embedded with the wires, and a first end; a second end; and a plurality of wave-shaped coils located between the first end and second end, each wave-shaped coil being formed of straight portions and curved portions that alternate with each other; wherein the straight portions of each wire are sequentially embedded in corresponding grooves of the stator, so that each of the grooves is embedded with the wires, and a rotor, comprising a first claw magnetic pole piece and an opposite second claw magnetic pole piece, the first claw magnetic pole piece having a plurality of N pole claw bodies, the second claw magnetic pole piece having S pole claw bodies of the same number as the plurality of N pole claw bodies of the first claw magnetic pole piece, and when the first claw magnetic pole piece and the second claw magnetic pole piece are combined with each other, the plurality of N pole claw bodies of the first claw magnetic pole piece and the plurality of S pole claw bodies of the second claw magnetic pole piece being adjacent to each other and being arranged separately; wherein the rotor is placed in the wound stator in a coaxial form, wherein the straight portions of each wire are, starting from the first end, sequentially embedded in a clockwise direction in the corresponding grooves of the stator to surround the stator, characterized in that; the straight portions of each wire are then sequentially embedded in the corresponding grooves of the stator in a counter-clockwise direction and jut out from one of the corresponding grooves with the second end, so that each of the corresponding grooves has two layers of wires, each layer corresponding to a single wire, and wherein the width of each of the plurality of grooves is sized to receive one wire at a time, so that the straight portions of the wires can be directly embedded into the grooves from the openings.