JPS5836216Y2 - Rotating electrical machine with stator and rotor - Google Patents

Description

[Detailed explanation of the idea] This invention relates to rotating electric machines.

Electric motors typically have a stator with laminations arranged perpendicular to the rotor axis and windings arranged substantially parallel to the rotor axis.

The laminates are held together within the package by bolts or the like.

The stator combined with the rotor is typically mounted within a housing or case made of aluminum or other suitable material.

The stator of the electric motor can also have its laminations parallel to the rotor axis.

The edges of the laminations along the rotor axis are then bent inward towards the rotor axis for guiding the magnetic flux.

A winding may be provided around the thus bent edge or middle portion of the laminate package.

Such motors are induction motors, commutator motors and permanent magnet motors.

When manufacturing electric motors, it is common to prepare a stator and a rotor separately in substantially completed states, and then attach the rotor bearings to the stator.

It is therefore necessary to insert the rotor into the stator cavity from one end and then secure the rotor within the bearing in a convenient manner.

The protrusions on the rotor shaft that support the various tools are free of parts to be installed later during the installation and final installation of the rotor to the stator.

Therefore, parts attached to the stator and rotor, such as the mains and fan wheels in vacuum cleaners, must be installed in stages.

Such a method leads to a satisfactory product, but is complex and expensive, especially the installation of the stator windings and the many small parts that must be placed in the proper order into the machine from one end.

According to this invention, a machine as described above is provided which is particularly notable for its great economic benefits.

When manufacturing a rotating electric machine with a stator and a rotor, housings, tools or the like are optionally attached, for example by molding of plastic, and windings, terminals, laminated bodies or permanent magnets are optionally provided by riveting. The rotor is constructed by dividing the stator into two or more parts, and the rotor with assembled parts is later assembled into a unit device.

It is advantageous to arrange the layered body and/or the magnets in the mold in such a way that they form a geometrically precisely defined surface, the elements being permanently fixed in the mold by the molding member. .

As a result, post-processing of the rotor cavity using a lathe or the like becomes unnecessary.

The stator can also be provided with a complete bearing seat and a clamping device for electrical conduction between the stator and the rotor.

The installation of bearings in conventional electric motors is such that the bearings are pressed into their final position from one side and identified in a suitable manner.

It is important that such bearings be coated as tightly as possible to retain grease and avoid contamination.

When the bearing is pushed in in a suitable manner in a conventional manner, the housing supporting the bearing can of course enclose the bearing only on the negative side, so that some kind of sealing element must be provided on the other side of the bearing.

Such bearings are usually held in place by wear between the outside of the outer ring and the housing, so that heating causes the housing, usually made of pressed aluminum, to stretch and hold more than the outer ring of the bearing. A certain reduction in force may cause rotation of the outer ring.

This invention results in a considerable simplification of the mounting of bearings in electric motors.

As mentioned above, it is possible to previously mount the bearing in a suitable position on the rotor shaft and press it from the side into a preformed bearing seat.

It is therefore possible to completely enclose the bearing with the housing and also to prevent rotation of the bearing in a suitable manner.

This idea is particularly suitable when the laminations are arranged to extend along an axis and whose ends are bent towards the rotor cavity to partially define the rotor cavity.

The part of the lamination forming the stator yoke with the winding embedded in the molding material, ie the yoke part, is therefore left without winding, and the winding is later provided.

To ensure a uniform magnetic flux, a magnetic optical fiber can be mixed into the molding compound.

In a special embodiment of the invention, the stator bundle can be split axially through a yoke, and the yoke is adapted to receive preformed windings simultaneously with the assembly of the stator sections; A magnetically conductive plastic material is placed at the coupling surface between the windings.

By forming the stator in two or more parts in this way, the rotor can be entered into the rotor cavity from the side instead of from one end, and the liquefied stator parts can be joined. can.

It is therefore also possible to divide devices attached to the stator, such as the cover of a hand tool, such as a dual-user hand-held drilling tool in a vacuum cleaner, into two or more parts.

Therefore, the electric motor of a vacuum cleaner with attached devices is a fan,
It is mounted in a very simple manner by prefabricating the rotor part with the bearings etc., and it can be very easily placed on the stator and diffuser which are molded in one piece.

This invention will be further explained with reference to the drawings.

FIG. 1 shows an electric motor in axial section with a stator 1 divided into two parts along an axial plane.

FIG. 1 also shows the blower housing 2 constructed with the stator.

The fan 5 can rotate around the protruding shaft 4 of the rotor 3.

The two halves 1a, lb of the stator 1 have axially extending laminations 6, the central part of which forms a stator yoke 7, and the edges 8 bent inwards and shown in FIG. As can be seen, they are spaced apart to form stator poles 9.

A plate with desired magnetic properties is used for the layered body.

The fixed calf bodies 1a, lb of identical construction are made of a suitable molding material, preferably hardened plastic, with tools that are known per se in principle.

The laminations 6 are shaped and fixed, and their edges are so positioned that they define the air gap in the finished stator without post-processing and are within the surface of the poles coaxial with the rotor. Forced by tools.

Before shaping, the yoke part 7 is formed with a stator winding 10, which is then shaped.

By forming the stator halves with a tool, the bearing seats of the rotor bearings 11, 12 and the conductive clamping devices between stator and rotor, such as carbon brushes 13, are formed at the same time.

With respect to the embodiment of FIG. 1, the stator halves are also widened to form a vane housing 14, which is adapted to co-move with the vanes 5 about the projecting rotor shaft 4.

The assembly of the electric motor described above is carried out very simply by mounting the rotor 3 in the bearings 11, 12, the vanes 5 extending from the sides into one of the stator halves formed in the half-shaped motor housing; The other half is also molded from the side, and then these two halves are assembled, for example with a metal sleeve 16.1.
7 from each end.

This manufacturing technique allows the stator halves to be constructed in a finished and precise form without the need for any post-processing prior to assembly.

If a ball bearing is used, a leap protection member such as an O-ring 18 may be inserted into the ring groove of the bearing seat.

3 and 4 show how the stator core 19 can be constructed from a laminated body 6 and a molded part 20, for example plastic.

In this example, the stator winding (not shown) has two protruding edges 2.
1 and is formed in the gap 22 facing backward and in front of the stator yoke 7.

FIG. 4 also shows how the ends of the stator core can be provided with edges and central guide surfaces for receiving, for example, special bearing caps.

FIG. 5 is an end view of a stator assembly different from that shown in FIGS. Instead of passing through the pole parts of the stator as in the case shown in the figure, it passes through the center of the yoke part 7 of the stator.

In this embodiment, preformed stator windings 10 may be threaded through the yoke portions during assembly of the various portions of the stator assembly.

In order to reduce the magnetic flux resistance at the connections between the yoke parts, shaped members are provided which suitably magnetically connect to the connecting surfaces during assembly of the various parts.

In this embodiment, the windings are not molded, so they are well cooled and the risk of damage to the windings during molding in plastic is avoided.

A similar construction can be chosen for the stator core with an axially extending lamination that is divided into yoke sections.

The principles of this invention can also be applied to electrical machines where the magnetic flux in the stator is obtained with permanent magnets and therefore without stator windings.

[Brief explanation of drawings]

Figure 1 is a sectional view taken along the line ■-■ in Figure 2 showing the electric motor and attached fan, Figure 2 is a partial cross-sectional end view of the electric motor in Figure 1, and Figure 3 is a stator core. FIG. 4 is a perspective view of a similar stator core, and FIG. 5 is a cross-sectional view of a motor in which the stator is divided through a yoke portion. In the drawings, 1 is a stator, 3 is a rotor, 4 is a rotor shaft, 6 is a laminated body, 7 is a stator yoke, 8 is an edge, 9 is a stator pole, 1
0 is a stator winding, 11.12 is a rotor bearing.

Claims (1)

[Scope of utility model registration request] The stator comprises a magnetic flux forming device in the form of a laminated body and two or more stator structures, each cut from a molded member integrally formed, the laminated body extending in the axial direction and the edge of the laminated body are bent inward to form stator poles, the central portion of the laminated body forms a stator yoke, and each of the stator components has circumferentially spaced inner circumferential surface portions of arcuate cross-section. wherein the inner circumferential surface portions are located between the portions forming a rotor cavity, and at least one of the stator structures extends longitudinally between the inner circumferential surface portions with a winding attachment device. an internal passageway, each stator component comprising axially spaced pocket portions forming an annular bearing seat for receiving a rotor shaft, and further comprising a locking device for securing the stator components to one another. A rotating electric machine having a stator and a rotor.