A motor and a fan are provided. The motor has a stator assembly, two mutually independent rotor assemblies, and two mutually independent rotating shaft assemblies. The stator assembly has a stator core and two groups of mutually independent windings. The rotor assemblies are oppositely and coaxially arranged on two axial sides of the stator assembly and form an axial air gap with the stator assembly. The two rotor assemblies are configured to rotate independently. The two mutually independent rotating shaft assemblies are coaxially connected with the two rotor assemblies, respectively, and protrude in a direction of the same side away from the stator core along the axial direction of the motor.

An electric motor is disclosed having a detachable stator tooth. In some implementations, coil windings of the electric motor may be coupled to one or more drivers independently of other coil windings. A method of repairing and manufacturing an electric motor having a detachable stator tooth is also disclosed.

To provide a stator of a motor having an insulating structure achieving insulation easily and reliably. A stator (1) of a motor comprises: a teeth unit (11) with a circular cylindrical part (111) having a circular cylindrical shape and multiple projection parts (112) spaced uniformly along an outer circumference of the circular cylindrical part (111) in a circumferential direction of the circular cylindrical part (111), the projection parts (112) projecting radially outwardly from the circular cylindrical part (111); multiple bobbins (13) having cylindrical shapes with hollow sections (133) through which the projection parts (112) of the teeth unit (11) are passed to be fitted in the hollow sections (133), the bobbins (13) having outer peripheries around which windings (14) are wound; a cylindrical external unit (12) arranged radially outside the teeth unit (11) and fitted to an outer circumference of the teeth unit (11) and the outer peripheries of the bobbins (13); and multiple first insulating parts (15) arranged to fill gaps between the circular cylindrical part (111) of the teeth unit (11) and the bobbins (13) and electrically insulating the teeth unit (11) and the windings (14).

It comprises stator segments forming a stator structure and a transverse structure connected to the stator structure and arranged between at least two stator segments. The transverse structure may have reinforcing ribs extending therealong and a handling device at longitudinally opposite portions of the transverse structure. A wind turbine generator comprising a rotor and said stator assembly and a wind turbine comprising such a generator are also provided.

An individual tooth segment includes a tooth head configured for connection in a form-fitting manner to a tooth head of a further individual tooth segment. The tooth head has a first flank formed on a left end of the tooth head as viewed in a radial direction and configured concavely with a first curvature, and a second flank formed on a right end of the tooth head as viewed in the radial direction and configured convexly with a second curvature. The tooth head has a center of area which is a center point of a circular arc of the second curvature of the second flank.

An electric motor including a stator body with a stator laminated core and a stator slot, wherein the stator slot has a slot wall with a slot wall insulation for electrical insulation, as well as at least one electrical conductor which is received by the stator slot, the slot wall insulation having a tooth-shaped configuration.

A coil includes a wound body and a resin covering. The wound body is configured by winding a conductor. The wound body is pressure-molded. The resin covering covers a surface of the wound body.

A tooth groove is provided at a border portion between a tooth body portion and a protrusion. The angle between a tooth body portion lateral face which is a lateral face in the circumferential direction of the tooth body portion and a tooth body portion stop portion which is a face, of the tooth groove, continued from the tooth body portion lateral face is the right angle or an acute angle. The protrusion is rotated toward the outer side in the circumferential direction, to bring a protrusion stop portion into close contact with the tooth body portion stop portion, the protrusion stop portion being an outer-circumferential-side lateral face of the protrusion, thereby forming a shoe in a tooth.

Halbach array electric motor with substantially contiguous electromagnetic cores, comprised of rotors and stators usually configured as permanent magnet and electromagnetic Halbach arrays respectively, wherein the enhanced magnetic forces of said Halbach arrays are focused between said rotors and stators.

A stator core for a rotating electrical machine includes core segments each including a stack of at least one first core member and at least one second core member. The first core member has an arc-shaped first yoke, a first tooth protruding from an inner peripheral side of an arc of the first yoke, a recessed portion provided at a first end of the first yoke, and a protruding portion provided at a second end of the first yoke. The second core member has an arc-shaped second yoke having both linear-shaped ends, and a second tooth protruding from an inner peripheral side of an arc of the second yoke. The recessed portions and the protruding portions of the core segments are combined to form an annular structure, and a dimension of the recessed portion in a radial direction of the annular structure is larger than a dimension of the protruding portion in the radial direction of the annular structure.