CS196857B1 - Rotor of alternator of the rotating electric machines - Google Patents

Description

The invention provides a rotor of an alternator of rotary electrical machines, comprising a concentric coil shaft composed of a coil body and an electrical winding and fixedly connected to it by two toothed faces, wherein the coil body is a skeleton of solid, magnetically conductive material. magnetically and electrically insulating material.

Rotors of rotating electrical machines comprising a shaft, a concentric excitation coil and a rotor yoke are known, wherein the coil body is formed of a metallic or non-metallic magnetically non-conductive material. The coil bodies of the prior art coils are either made in one piece or composed of a plurality of parts joined together in different ways. The prior art rotor yokes are composed of two faces with tines of ferromagnetic material, where the teeth of the faces are alternated and adapted to form the front poles of the rotor. The shape of the prior art teeth has either a constant cross section or tapered towards the end in the form of a pyramid.

A disadvantage of the prior art excitation coils is their body of homogeneous magnetically non-conductive material. Plastic bodies do not have the required strength, and aluminum or bronze bodies are more or less clay. In addition, metal bodies made of magnetically non-conductive material generate eddy currents in the alternator, exerting externally reduced efficiency and higher temperatures.

A disadvantage of the tooth shape of the previously known magnetic poles is the lower electrical efficiency due to the deformation of the magnetic field.

The above drawbacks are overcome by the alternator rotor, where all the teeth forming the magnetic poles are in the shape of a sector of rotating ellipsoids whose axes are parallel to the rotor axis.

The teeth forming the segments of the ellipsoid sector facilitate the transfer of the magnetic field into the air gap of the stator as potentially homogeneous, allowing the induced voltage and current in the stator to approach an optimal sine wave. Teeth in the shape of a rotating ellipsoid or a geometrically very similar shape eliminate unwanted peak voltage, and the entire alternator can be simplified by fewer diodes, which may have lower parameters.

In the accompanying drawing, the alternator rotor is shown, wherein Fig. 1 is a schematic cross-section of the alternator rotor, and Fig. 2 shows a detail of the tooth shape.

In the unmarked stator of the rotary alternator, a rotor composed of a shaft 1, on which the excitation coil 2 is fixedly mounted, and of the faces 3, 4 with the teeth 5, moves.

196 857

196 857 is comprised of a coil body 6 and an electrical winding 7. The coil body 6 is made of a magnetically conductive material. A layer 8 of insulating material is formed on the contact surface of the coil body 6 with the electrical winding 7.

The shape of the teeth 5 of the faces 3, 4 is in the shape of a sector of rotating ellipsoids whose axes are parallel to the axis of the rotor 10.

FIG. 2 shows in detail the shape of the teeth

5. The rotating ellipsoid 11 with the axis 9 forms part of its sector with the shape of a tooth 5.

Claims (1)

Rotor of an alternator of rotary electrical machines consisting of a concentric coil shaft composed of a coil body and an electrical winding and fixedly connected to it by two toothed faces, the coil body consisting of a skeleton of solid magnetically conductive material characterized in that all of the cogs (5) forming the magnetic poles are in the form of a sector of rotating ellipsoids (11) whose axes (9j are parallel to the axis of the rotor (10)).