HK1018130A1

HK1018130A1 - Plate for electrodynamic machines

Info

Publication number: HK1018130A1
Application number: HK98112046A
Authority: HK
Inventors: 约瑟夫‧格吕德尔
Original assignee: 格哈德‧盖格尔有限公司
Priority date: 1995-05-18
Filing date: 1996-02-19
Publication date: 1999-12-10
Also published as: JP2868625B2; HU222704B1; ATE185457T1; RU2146846C1; CZ352297A3; PL323319A1; CA2215790C; KR19990008261A; CZ285137B6; CA2215790A1; AU4878396A; CN1077343C; JPH09508000A; EP0872005A1; WO1996037029A1; ES2139336T3; CN1183178A; KR100406051B1; EP0872005B1; HUP9900823A3

Abstract

The lamination plate has a central aperture (12) enclosed by a number of segments (14,16) with radial legs (18,20) and peripherally extending arms (22,25) defining winding reception slots (30). The winding slots are accessible via openings (32) adjacent the outer ends of the radial legs, which can be closed after insertion of the machine winding by bending the legs and/or the peripheral arms.

Description

Lamination for an electric motor

The present invention relates to a lamination for an electric motor.

Such a laminate is disclosed in, for example, japanese patent application No. 5-236682, and has been used in the manufacture of a laminated body of an electric motor, which is formed of a plurality of annular laminates. It is known to arrange the openings at the radial ends of the legs and to close them by means of a closing ring with projections, which has the disadvantage that the ring takes up additional space and must also be coupled individually to each lamination. Similar to that described above for the laminate described in US-a-5187858. Furthermore, US-a-628377 discloses a stator body for an electric motor, the opening of which is formed centrally and closed by means of a cylinder. The winding slots have openings in the radial direction for the magnetic flux. By which the magnetic flux is significantly improved.

In view of the state of the art mentioned above, the present invention is based on the task of seeking to remedy the problems mentioned above.

According to the invention, a lamination for a magnetic circuit of an electric motor is proposed, with a central bore and parts distributed around the circumference of the bore with legs which are distributed radially and can have circumferentially extending arms, which legs with openings formed at the radially free ends of the legs form winding slots which are radially accessible from the outside, the openings being closable by bending the legs and/or the arms, wherein the circumferentially extending arms each consist of two segments between which an opening is formed, the outer segments being bendable down onto the inner segments for closing the openings.

It has been realized that the invention anyway achieves that the openings of the winding slots for winding are arranged asymmetrically and are configured at the free ends of the radially straight legs, when the lamination is concerned. The individual circumferentially extending or radial arms are here made of a bendable material, for example steel, and can be bent after winding of the stator lamination stack to close the slots. Thus, the rings are redundant and the outer dimensions of the stator can be reduced by at least the radial thickness of one ring. The ends of the arms and legs opposite each other may additionally be joined by, for example, welding or brazing.

The fundamental advantages of the proposed method are the reduction of individual parts, the minimization of the outer dimensions of the stator body and the reduction of manufacturing and winding of the stator body, since the winding slots are particularly lined with insulating material, depending on the structure of the stator body, and this is a step in the manufacturing process. The stator body is then automatically wound and finally the opening for winding is closed by bending the legs and/or arms. The ends of the legs and arms opposite each other may be securely coupled to each other by, for example, welding, brazing, bonding, or the like, as desired. This procedure is obviously technically simpler to implement than mounting the stator body with an integral ring or separate rings, the opening usually being closed by said rings. The winding is simplified by casting a hollow shaft at both axial ends simultaneously with the winding slot layering process, by means of which the winding is simplified, for which purpose an insulating material is regularly used which is age-hardened after the casting process without however significantly affecting the magnetic flux, and finally the central opening of the lamination is enlarged for improving the magnetic flux, so that the magnetic flux-reducing metal barrier between the central opening and the individual winding slots is removed, in which case the parts adjacent to one another are connected together by means of the insulating material. After winding, the user obtains a ready-to-use stator body with wound wire, where all manufacturing steps, starting from the punching of the laminations to the end of the enlargement of the inner diameter of the central hole, can be automatically performed.

One particularly practical arrangement is that the arms and/or legs are made of a bendable material. These measures allow the winding slots of the laminations of the lamination stack to be completely closed, for example by welding. A laminate with closed winding slots is obtained, the strength of which is considerably increased.

Another practical configuration of the invention is that the openings are configured in the shape of slits extending in the radial direction, which makes the winding of the lamination simple. Further, the straight radial legs are open at their inner side. By this measure, the ends of the legs and arms opposite each other can be brought into contact without problems. A further interesting configuration is that the circumferentially extending arms have a predetermined bending point. By these measures it is also possible to quickly couple together the ends of the legs and the arms.

A particularly practical embodiment of the invention provides that the circumferentially extending arms each consist of two segments, between which an opening is formed, wherein the outer segments can be bent down onto the inner segments to close the openings. It is practical here for the slot to narrow inwards. It is particularly advantageous in the inventive concept if, when a predetermined bending point of the outer section is formed at the connection point of the sections and in the bent state of the outer section, the outer section is connected to one another in a sealing manner both with the inner section and with the radially straight legs which narrow toward the free end, forming a channel for the weld seam. This measure ensures that the shape of the winding slot is not deformed after the outer section has been bent and is not changed afterwards. Therefore, damage to the winding wire is not likely to be caused.

The practical design of the invention is further designed in such a way that the winding slots are lined with insulating material, wherein the winding slots are turned into slots which are radially oriented and filled with insulating material and which extend towards the central opening. By these methods, a connection between the winding wire and the lamination without electrical contact is achieved. A particularly practical embodiment of the invention provides that the groove filled with insulating material operatively connects two adjacent sections to each other. This measure provides that the magnetic flux of the winding slots passes into the central bore without hindrance.

The invention also relates to a method for manufacturing such a laminate. The method comprises the steps of first forming a blank of laminations with winding slots and other slots as required, stacking the laminations together to form a stator sheet, laying or filling the winding slots and other slots with a suitable insulating material and winding. The diameter of the central bore is further enlarged such that the annular rim, which joins the parts together, is removed and a groove of rectangular cross-section, filled with insulating material, extends into the central bore. The ends of the arms and legs that are opposed to each other are finally coupled together by bending.

Several embodiments of the invention are generally depicted in the figures and are further explained below. They describe

FIG. 1: a blank of a laminated sheet is provided,

FIG. 2: the laminate depicted in fig. 1, with winding slots lined with insulating material,

FIG. 3: fig. 2 depicts a laminate with wire-wound winding slots,

FIG. 4: FIG. 3 depicts a laminate in which the ends of the legs and arms opposite each other are arranged together without a gap

FIG. 5: the lamination depicted in fig. 4, wherein the arms and legs that remain in contact are joined together by welding,

FIG. 6: the laminations depicted in fig. 5, have center holes with radii expanded to γ 2,

FIG. 7: in yet another type of laminate, the first and second layers,

FIG. 8: the laminations depicted in fig. 7, with curved arms,

FIG. 9: an enlarged partial view of the laminate is shown,

FIG. 10: a stator sheet body consisting of the laminations shown in figure 7,

FIG. 11: the stator sheet depicted in fig. 10, with layered winding slots and die-cast shaft,

FIG. 12: as seen in the view in the direction of arrow XII in figure 11,

FIG. 13: figure 11 shows an axial cross-sectional view of the stator body,

FIG. 14: yet another perspective view of a stator plate body,

FIG. 15: from the view in the direction of arrow XV in figure 14,

FIG. 16: from a partial enlargement of XVI in figure 15,

FIG. 17: an enlarged view of a portion XVII in fig. 15.

Fig. 1 to 9 show a lamination 10 for a magnetic circuit of an electric motor. It is designed with a central hole 12 and parts 14, 16 arranged around the central hole, which are coupled to each other by means of a non-magnetic or non-electrically conductive material. The sections 14, 16 are provided with radially straight legs 18, 20, the legs 18, 20 having circumferentially extending arms 22, 24 as required. The legs 18, 20 and the opening 32 together form a winding slot 30 that is accessible radially outwardly. The opening 32 is formed at the radial free end of the leg 20. The arms 22, 24 and legs 18, 20 are constructed of a bendable material. The width d1 of the opening 32 is greater than the thickness of the winding wire, which is not further described. It will further be appreciated that the openings 32 are configured in the form of radially extending slots to allow winding wire to be fed along the inner wall 31 of the winding slot 30. The straight radial leg 20 is slotted at its ends and can be bent without problems. The winding slots 30 are laid with insulating material 44 prior to winding, as illustrated in figure 2. It will further be appreciated that the winding slots 30 rotate into radial slots 46 filled with insulating material 44, which are initially spaced a distance d2 from the central bore 12. At this stage, the opening 12 of the lamination 10 has an inner diameter γ 1. This inner diameter γ 1 is enlarged after winding and closing of the opening, so that a value γ 2 (see fig. 6) is reached, with the result that the slots 46 filled with insulating material 44 connect the winding slots 30 with the central bore 12, and thus it is achieved that the magnetic flux is ensured inwardly into the central bore 12.

In fig. 7 and 8 a laminate is shown, the arms of which have predetermined bending points 40 and which are bent to the free ends of the legs 20 after winding of the laminate. The lamination is a stamping on which the parts 14, 16 are alternately configured in a T-shape and a toothed shape with a slot 16-0, and the segments 16-1 and 16-2 distributed on either side of the slot 16-0 can be bent over the free ends of the arms 24 after winding of the winding slots 30, which are joined together by welding, for example.

Fig. 14 to 17 show a lamination of a stator body or stator body, which is distinguished in that the circumferentially extending limbs 22, 24 each consist of two sections 22.1, 22.2 and 24.1, 24.2, which form an opening 22.3 or 24.3 between them, wherein the outer section 22.1 or 24.1 can be bent over the inner section 22.2 or 24.2 (see fig. 17), thus closing off the opening 32. The openings 22.3 and 24.3 are narrowed inward, so that the connecting points of the sections 22.1, 22.2 and 24.1, 24.2 form predetermined bending points 1 of the outer sections 22.1 and 24.1. In the bent state of the outer sections 22.1, 24.1, the outer sections 22.1, 24.1 can be joined together tightly, not only with the inner sections 22.2, 24.2, but also with the legs 20 narrowing toward the free ends, forming a channel 1.1 for the weld seam. This embodiment has the advantage that the insulation-coated winding slots 30 are not deformed by bending the outer sections 22.1, 24.1, since the shape of the winding slots is not changed and the inner sections 22.2, 24.2 are not bent, thus ensuring that the insulation does not fall off the inner walls of the winding slots 30.

Fig. 16 and 17 show that the mutually opposite side surfaces 20.1 and 22.5 are joined to one another in a sealed manner in the bent state of the outer section, wherein the end surface 22.6 of the head 22.4 closes the opening 32 of the winding slot 30. After the stator body winding and the bending of the segments 22.1 and 24.1, these segments and the legs can be welded together, if necessary, in the region of the channel 1.1. Due to the special structure of the lamination, the manufacture of the stator body is particularly simple and the winding is made problem-free.

The proposed method of manufacturing the laminate is as follows:

first, a lamination blank with winding slots and a central bore 12 (fig. 1) can be produced, for example, by stamping, the radius γ 1 of the central bore being determined such that an edge 11 is formed between the central bore 12 and the slot 46.

A plurality of laminations are stacked on the laminations to form a stack (fig. 10), and the winding slots 30 are lined with plastic. At the same time, the hollow cylindrical shaft 6 is cast at the axial end by die casting, which makes the holding of the stator body simple during winding. The radially inner side can then be cut off by cutting, cutting or turning. Such a lamination stack is then wound and finally the opening 32 is closed by bending of the legs 18, 20 and/or arms 22, 24. This results in a complete component which no longer requires a stiffening ring or additional elements. For larger stators, it may be reasonable to securely couple the legs and arms in contact with each other, for example by welding, brazing or adhesive bonding.

Claims

1. Lamination (10) for a magnetic circuit of an electric motor, with a central bore (12) and parts (14, 16) with legs (18, 20) distributed around the circumference of the bore (12), the legs (18, 20) being distributed radially and possibly with circumferentially extending arms (22, 24), the legs (18, 20) forming winding slots (30) radially accessible from the outside with openings (32) formed at the radially free ends of the legs (20), the openings (32) being closable by bending the legs (18, 20) and/or the arms (22, 24), characterized in that the circumferentially extending arms (22, 24) each consist of two segments (22.1, 22.2; 24.1, 24.2) between which the openings (22.3, 24.3) are formed, and the outer segments (22.1, 24.1) being bendable down onto the inner segments (22.2, 24.2) to close the openings (32).

2. A laminate according to claim 1, characterized in that the arms (22, 24) and/or the legs (18, 20) are made of a bendable material.

3. A laminate according to claim 1 or 2, characterized in that the width d1 of the opening (32) is larger than the thickness of the winding wire.

4. A laminate according to claim 1, characterized in that the openings (32) are configured in the shape of radially extending slits.

5. A laminate according to claim 1, characterized in that the diametrically radial legs (20) are slotted at their ends.

6. A laminate according to claim 1 or 2, wherein the circumferentially extending arms (22, 24) have predetermined bending points (40).

7. A laminate according to claim 1, characterized in that the openings (22.3, 22.4) are inwardly narrowed.

8. A laminate according to claim 1, characterized in that the segments (22.1, 22.2; 24.1, 24.2) at their junction constitute predetermined bending points (1) of the outer segments (22.1, 24.1).

9. A laminate according to claim 1 or 8, characterized in that the outer sections (22.1, 24.1) are joined to each other in a mutually closed manner with the inner sections (22.2, 24.2) and with the legs (20) narrowing at the free ends in a state in which the outer sections (22.1, 24.1) are bent, forming a channel (1.1) of the weld seam.

10. A laminate according to claim 1 or 2, characterized in that the mutually opposite ends of the leg (20) and the arm (22, 24) are joined to each other in the wound state, for example by welding.

11. A laminate according to claim 1, wherein the winding slots pass into radial slots 46 filled with insulating material (44) and through which the magnetic field flows, which extend into the bore (12).

12. A laminate according to claim 11, characterized in that the two adjacent portions (40, 16) are operatively interconnected by a slot (46) formed of a magnetic field permeable insulating material (44).

13. A method of manufacturing a stator consisting of a laminate according to claim 1, characterized in that the laminate (10) is stacked to form a laminate body (4), the winding slots are then laid with insulating material and, if necessary, hollow studs are molded at the axial ends, and finally the winding slots are wound and the openings are closed.

14. Method according to claim 13, characterized in that the radially inner side is cut off by cutting, chipping or turning in the application of the lamination with the magnetic field channels.

15. Stator lamination body for an electric motor, made of a lamination according to claim 1.