A motor includes a rotating shaft, an armature core, a plurality of coils, a commutator and a pair of brushes. The plurality of coils include three or more coil pairs each of which consists of a pair of coils configured to be point-symmetrical with respect to a rotation center axis. One of the three or more coil pairs constitutes a pair of number-of-turns adjustment coils which would have a lowest inductance in the plurality of coils if all the plurality of coils had the same number of turns. The number of turns of the pair of number-of-turns adjustment coils is set to be larger than the number of turns of any of the remainder of the three or more coil pairs. The inductance of the pair of number-of-turns adjustment coils is set to be higher than the inductance of any of the remainder of the three or more coil pairs.

A rotor assembly (100), comprising a rotor (101) and a rotor winding (102). The rotor (101) is provided with a plurality of teeth; tooth slots are provided between adjacent teeth; the rotor (101) can be connected to a rotor shaft to output power; the rotor winding (102) is composed of coils wound on the rotor (101); the rotor winding (102) comprises a portion extending in an axial direction parallel to the rotor assembly (100) and a portion extending in a plane perpendicular to the axial direction; the portion extending in the plane perpendicular to the axial direction comprises a plurality of sections; in the axial direction, the plurality of sections are in one-to-one correspondence to corresponding sides of two or more polygons, respectively. The winding method can solve the problems such as length difference of copper wires between windings due to sequential superposition of the coils in traditional windings, thus achieving the technical effects of improving the balance of the armature and minimizing the difference in resistance of windings.

A rotor of an electric motor includes a rotor package with a plurality of radially directed rotor teeth and a commutator with a number of commutator bars which is twice as large as the number of rotor teeth. Diametrically opposed commutator bars are respectively connected to a contact bridge. A rotor winding includes a plurality of coils wound on the rotor teeth. Each coil has first and second coil ends and the first and second coil ends of each coil are connected directly to commutator bars that are not adjacent to each other. A method for manufacturing a rotor and an electric motor, are also provided.

A rotor of an electric motor includes a rotor package with a plurality of radially directed rotor teeth and a commutator with a number of commutator bars which is twice as large as the number of rotor teeth. Diametrically opposed commutator bars are respectively connected to a contact bridge. A rotor winding includes a plurality of coils wound on the rotor teeth. Each coil has first and second coil ends and the first and second coil ends of each coil are connected directly to commutator bars that are not adjacent to each other. A method for manufacturing a rotor and an electric motor, are also provided.

A motor includes: a magnet including a plurality of magnetic poles; a plurality of slots opposing the magnet; a coil wound around each of the plurality of slots; a commutator including a plurality of segments; and a plurality of brushes, each of the plurality of brushes including a contact portion contacting two adjacent segments among the plurality of segments, wherein both ends of the coil are connected to the two segments among the plurality of segments, and another segment is arranged between the two segments, one ends of two adjacent coils are connected to one segment of the two segments, and a segment connected to one ends of two adjacent coils and the another segment between two segments connected to either coil different from the two adjacent coils have the same potential.

A hand held power tool that includes a housing, a power source input configured to receive power from a power source, and a brushed motor located within the housing. The brushed motor is configured to receive power from the power source input. The brushed motor includes a first primary stator pole including a first pole neck and a first pole arc, a second primary stator pole including a second pole neck and a second pole arc, a first stator interpole including a first interpole neck, and a second stator interpole including a second interpole neck. The first stator interpole and the second stator interpole are each positioned between the first primary stator pole and the second primary stator pole.

According to the present invention, a coil is continuously wound in a single pass around each of a series of teeth, and connected to each segment.

According to the present invention, a coil is continuously wound in a single pass around each of a series of teeth, and connected to each segment.

A brush motor includes a stator and a rotor. The rotor includes a rotary shaft with a rotor core and commutator fixed thereto. The commutator includes an insulating base and commutator segments fixed to the insulating base. The stator includes 2P stator poles, where P is an integer greater than 1. The rotor comprises m teeth, where 4P>m>2P, and 2m is an integral multiple of P. The rotor includes a rotor winding, which is a concentrated winding having m first elements and m second elements. Each tooth is wound with one of the first elements and one of the second elements. the m first elements form a plurality of element groups, each having n first elements connected in series, and being connected only to corresponding commutator segments at both ends thereof, where P≥n≥2. Both ends of each second element are connected to corresponding commutator segments.

A brush motor includes a stator and a rotor. The rotor includes a rotary shaft with a rotor core and commutator fixed thereto. The commutator includes an insulating base and commutator segments fixed to the insulating base. The stator includes 2P stator poles, where P is an integer greater than 1. The rotor comprises m teeth, where 4P>m>2P, and 2m is an integral multiple of P. The rotor includes a rotor winding, which is a concentrated winding having m first elements and m second elements. Each tooth is wound with one of the first elements and one of the second elements. the m first elements form a plurality of element groups, each having n first elements connected in series, and being connected only to corresponding commutator segments at both ends thereof, where P≥n≥2. Both ends of each second element are connected to corresponding commutator segments.