WO1990013936A1

WO1990013936A1 - Sheet-metal frame for electric motors

Info

Publication number: WO1990013936A1
Application number: PCT/RO1990/000001
Authority: WO
Inventors: Mihai Zissu; Leonida-Stefan Vaitus; Varlam Balmus; Gheorghe Badescu; Constantin Pernes; Mihail Alexandru Grigore
Original assignee: Entreprise Des Moteurs Electriques Pitesti
Priority date: 1989-05-03
Filing date: 1990-04-26
Publication date: 1990-11-15
Also published as: DD294378A5; EP0429572A1; RO99709B1

Abstract

The invention relates to a technical solution for creating a sheet-metal frame for electric motors - such as three-phase asynchronous electric motors - as well as to the method of using sheet-metal and the assembly marks needed to produce the electric motor frame which ensures mechanical sturdiness and an optimal outward transfer of the heat given off by the motor. According to the invention, construction is simple and is carried out according to standard technological methods which contribute to reducing specific consumption of uneconomic and energy-intensive materials (aluminium and aluminium alloys, coiling lead, electrotechnical strips).

Description

BUILT IN SHEET FOR

ELECTRIC PRESSURES

The invention relates to a sheet metal frame for electric motors, such as three-phase asynchronous electric motors, to which, for the purpose of enlarging the external cooling surface, cooling fins are used.

In order to enlarge the external cooling surface and to ensure the efficient transfer to the external medium of the heat released in the electric motor, we know the frame of the electric motors cast in al uminium alloy or cast iron, construction for which the cooling fins are cast at the same time as the metal casing in which the package of stator sheets and the pad for fixing the electric motor are pressed.

The frame made by casting in aluminum alloy or cast iron ensures good thermal contact, and also, by the casting at the same time of the fins and of the envelope, the operation is minimal.

The casting frame made of aluminum alloy or cast iron has a series of disadvantages, as follows

- large specific consumption of loss-making materials which have high prices (aluminum and its alloys, respective the winding conductor or the electrotechnical sheet)

- increased energy consumption, specific to aluminum castings, and cast iron.

- technology specific to the molding and machining of aluminum and cast iron. - requires subsequent machining of the fixing pad to ensure the dimensions of dimensions and fάxation imposed

- very difficult working conditions, specific for aluminum or cast iron foundries, or for the machining of cast iron

Also known are sheet metal frames to which the cooling fins have the configuration of a steel strip which are welded to the outer surface of the envelope, along the latter.

The sheet metal frame with the fins in the form of a steel strip eliminates most of the disadvantages presented for the cast frame, but it has the disadvantages of requiring a large number of weld beads, which lead to a maneuver of great execution. This disadvantage becomes major for large production series and for engines which, the achievement of a useful power in a small size, requires an increase in the number of cooling fins.

For the same purpose we still know (Brévet Romania no. 85773) the frame, of which on the sheet metal envelope executed in one piece and in known constructions, the cooling fins which are no longer simple strips are welded , but have the shape of a V with the point towards the outside of the frame, and the ends of two dimensions placed on the envelope of the frame, immediately next to the ends of the neighboring fins, to ensure the possibility of fixing two fins neighbors by the same weld bead.

Compared to the sheet metal frame, with cooling fins executed in steel strip, the frame according to Romanian Patent No, 85773 has the advantages that it is more solid and ensures better transmission to the outside of the developed heat. by the engine.

Even if the welding maneuver is reduced, it remains a disadvantage of greater autamt that the cooling surface of the fins is also limited by the V-profile and by the overall dimensions of the motor.

Also known (Austrian Patent No. 181892) the frame whose sheet metal envelope is provided with at least one planking by which it is pressed into the longitudinal channel provided on the outer surface of the sheet pack, as well as a good tightening of the frame on the static sheet pack, in order to ensure a better transmission of heat For the same purpose of improving the heat transfer to the envelope presented in the patent, it is possible to add above it a second envelope of corrugated sheet, interrupted in front of the longitudinal channels, so as not to affect the pressing of the frame on the package.

The frame produced according to Austrian Patent no.181892 also has the advantages which result from replacing the cast frame made of aluminum alloy or cast iron with a sheet metal frame; it also has the advantages of ensuring good thermal contact with the packet of stator sheets and of increasing the cooling surface by which the heat developed by the motor is transferred to the outside environment. But, since the cooling fins are produced in this case in the form of the corrugated envelope, the welding operation of this fins can be small but the construction supposes an additional operation for the execution of the pressing of the frame in the longitudinal channels on the packet of sheets and the production of the corrugated envelope presents a series of technological difficulties concerning the rolling and the fixing on the first envelope.

We also know (Sweden patent no. 369358 which covers the article published in the review TECHNISCHE RUNDSCHAU no. 34 on August 23, 1977 page 17) the frame made of corrugated sheet, rolled and welded. The cooling fins resulting from

the corrugation of the sheet are closed and rigidified at the ends. To ensure mechanical resistance and to assemble correspondingly the

e and the engine calipers, the frame made of corrugated sheet metal is consolidated at the ends by rigid steel rings.

This construction has the advantage that for the execution of the frame with fins it is necessary

to have a single mark, the corrugated sheet envelope, eliminating the maneuver for the execution and the welding of the cooling fins.

The sheet metal frame presents a series of disadvantages

- to ensure mechanical robustness it is necessary to use two steel rings on the ends of the frame.

- in order to fix the package in the frame, special technologies are needed, such as

example, powder welding.

- the air which is in the interior folds of the frame which are finished, forms a thermal insulator. This is why one imposes the resistance of an interior fan.

- the thermal contact between the frame and the pack of static sheets is not made on the entire outer surface of the pack, thanks to the folds of the frame.

-the difficulties of removing heat, due to the air pockets of the folds of the frame and the reduced thermal contact between the peg of statuary sheets and the frame, fon

t that this construction is not used for actors in closed structure only in the variants for large sizes from size 250.

The frames executed in sheet metal still have the disadvantage that the fixing plate of the electric motor is no longer executed in the same way with the envelope and the cooling fins, but this is a completely separate reference which must be fixed. by different processes on the engine frame.

We thus know the execution of the engine fixing gag by casting in aluminum alloy or cast iron or by stamping the steel sheet.

The two constructions have the disadvantage that they require a supplementary maneuver for the execution and the mounting of the engine fixing pad, a maneuver which is added to the machining manosuver of the pad after lying, in order to form the surface engine location and to ensure the dimensions of size and fixing thereof.

In addition, the fixing pad executed by casting in aluminum alloy or cast iron also has the disadvantages of a loss of material consumption and a low cost - aluminum alloy, in the case where it is executed in alloy aluminum, increased energy consumption specific to foundries that use aluminum and cast iron technologies specific to aluminum or cast iron casting, very difficult working conditions, specific to aluminum and cast iron foundries or machining cast iron.

The object of the invention is to produce a sheet metal frame for electric motors which can be executed by usual technological methods, under the conditions of minimum consumption of materials and energy and with a consumption of execution maneuver. comparable with the frame made by casting in aluminum alloy or cast iron, frame which must

be to ensure an efficient transfer of heat and which can be used in any type of electric motor, of any construction (open, closed or waterproof) whatever the dimensions of size or power or the manner in which it must be fixed the frame (with shoe, with shoe and flange or with flange).

The present invention solves the problem of finding a construction variant which must ensure good thermal contact of the frame with the stator plate package, the largest possible cooling surface of the cooling fins, in a space as small as possible. possible, to carry out the dimensions of dimensions and fixing of the engine without the subsequent machining of the fixing frame, the mechanical robustness and the corresponding design for the entire engine assembly

The sheet metal frame for electric motors according to the invention removes the above mentioned disadvantages, because, in order to ensure efficient transfer the external medium of the heat developed by the motor and the corresponding mechanical robustness, it is constituted by a cylindrical piece of steel as for the known constructions, but the cooling fins executed in sheet metal, have a special construction which ensures a large surface of heat transfer and mechanical robustness by the fact that on the lateral surface of the fins they are stamped areas, alternating with smooth areas and the sheet of which these fins are executed and in such a folded manner that, in

cross section the resulting profile is similar to one of the letters Ω, L, U, M, Z; the sheet metal frame may have a motor fixing pad also executed in stamped, stamped and bent sheet metal, in which motor fixing holes are made in the location zones which form the location surface of the motor and the ears for fixing the shoe in which oval holes are made by which the shoe is assembled with supports for fixing the shoe, also made of stamped and folded sheet metal, fixed directly on the motor frame and which are formed by a fixing area on the frame and a second zone, usually parallel to the vertical axis of the engine, zone in which are also provided

mounting ears which have oval holes, through which the motor shoe is assembled with screws, holes which have the longitudinal axis perpendicular to the longitudinal axis of the oval holes of the shoe fixing ears, of a in such a way that during the assembly of the shoe with the fixing supports, adjustment can be carried out in two perpendicular directions, from the position of the shoe, in order to ensure directly by mounting

dimensions and fixing of the electric motor.

The cooling fins are fixed to the cylindrical piece individually - piece by piece - in a group of two or more cooling fins mechanically connected together, by connecting bridges. The pad fixing supports are made of sheet metal having different thicknesses, as well as the thick sheet support must ensure the mechanical resistance of the whole assembly, while the support executed in thin sheet takes during the mounting of the shoe. shape and position resulting from the execution and assembly of the mounting brackets and the shoe, as well as ensuring the realization of the gauge rib, respective to the height of the axis of the motor relative to the surface of base of the skid and the mounting rib, respective positions of the engine mounting holes relative to the shoulder of the

tree

The pad mounting brackets will be fixed to the engine frame by means q

them, like screws, welding etc. after laαuelle the pad is assembled.

The padding of the pad with the fixing supports is carried out with screws or other assembly elements by the oval holes which are in the fixing ears of the pad and the supports, adjusting during the assembly the position of the pad relative to the axis of the motor, in the two directions allowed by the oval holes which are in the ears of the

fixing the shoe and supports, adjusting during assembly, the position of the shoe relative to the motor axis, in the directions allowed by the oval holes which are in the fixing ears of the shoe and the fixing supports shoe, in order to achieve, directly by mounting, the template and fixing ribs imposed for the engine.

Around the oval holes of the pad fixing ears and / or around the oval holes of the

Eyes for fixing the fixing supports, on the contact surfaces between the skate and the fixing supports of the skate, crossed grooves are carried out in order to ensure against the displacement of the skate relative to the fixing supports of the skate, during the engine operation. In order to clear the base surface of the skid with respect to the rest of the skate and to ensure the flatness of this surface, in the base zones, light stampings are carried out which exit these zones from the plane of the sheet metal plate from which the runner is executed and it is also possible to execute a leveling of the trim surfaces, by the execution of crossed grooves on the surfaces opposite to the trim surfaces.

The fixing ears of the skate by which one the whole with the fixing supports, one executes by cutting and folding of the interior of the "sheet metal plate which constitutes the material necessary for the skate.

In order to mechanically reinforce the skate, in the yes zones connect the areas of attitude of the skate and the fixing ears of the skate, performs ribbing.

Obviously, these ribs can also be provided on the pad fixing ears and / or on the pad fixing supports, if this is necessary.

An exemplary embodiment of the invention is presented below, with reference to FIGS. 1 ... 23 which represent; Figure 1, embodiment of an asynclirone electric motor in sheet metal frame according to the invention Figure 2, Front view of the sheet metal frame for electric motors, according to the invention

Figure 3, side view of the sheet metal frame for electric motors, according to the invention

Figure 4, Side view of a cooling fin of the

sheet metal frame for electric motors, according to the invention

Figure 5, cross section through the stamped area in a first embodiment of a cooling fin of the sheet metal frame, for electric motors, according to the invention

Figure 6, cross section through the stamped area in a

second example of embodiment of a cooling fin for the sheet metal frame for the motors electric, executed individually, according to the invention

Figure 7, cross section through the stamped area in a third embodiment of a cooling fin of the sheet metal frame for electric motors, executed individually, conforming to the invention

Figure 8, cross section through the stamped area in a fourth embodiment of a cooling fin of the sheet metal frame for the electric motor, executed individually, according to the invention

FIG. 9, cross section, through the stamped area in a fifth example of fitting a cooling fin for the sheet metal frame for electric motors, executed individually, in accordance with the invention

Figure 10, cross section through the stamped area in a first embodiment of a group of cooling fins of the sheet metal frame for electric motors, according to the invention Figure 11, view from above, in a first example production of a group of cooling fins of the sheet metal frame for electric motors, in accordance with the invention

Figure 12, cross section through the stamped area in a second embodiment of a group of cooling fins of the sheet metal frame for electric motors, according to the invention Figure 13, top view in a second example production of a group of cooling fins of the sheet metal frame for electric motors, in accordance with the invention

Figure 14, cross section through the stamped area in a third embodiment of a group cooling fins of the sheet metal frame for electric motors, in accordance with the invention

Figure 15 - top view in a third embodiment of a group of fins d.e cooling of the sheet metal frame for electric motors, according to the invention

Figure 16, folding detail - front view - of the fins in a fourth embodiment of a group of cooling fins, according to the invention

Figure 17, folding detail - front view - of the fins in a fifth embodiment of a group of cooling fins of the sheet metal frame for electric motors according to the invention.

Figure 18, front view of an exemplary embodiment of the pad fixing support, according to the invention

Figure 19, front view of an exemplary embodiment of the pad fixing support, according to the invention

ligure 20, top view of the engine mounting bracket, in a cisem of realis. tion according to the invention

Figure 21, section through the area of the fixing holes and the fixing ears of the engine fixing pad, in accordance with the invention

figure 22, section through the area of the fixing holes and the reinforcing ribs of the fixing pad, of the motor, in accordance with the invention figure 23, detail of assembly of the pad and of the fixing bracket to the pad, according to the invention

Lo frame ME electric motors, according to the invention, according to Figures 1, 2 and 3 is consisting mainly of a cylindrical part 1, executed in rolled and welded sheet steel, cooling fins 2, 2 ′ and 2 "executed in sheet steel and welded to the cylindrical niece 1, by two fixing supports of the pad 3 and 3 ', by a pad for fixing the motor 4 and by means of the supports of the terminal box. 5.

The cylindrical piece 1 of rolled steel is welded executed in sheet metal having the thickness necessary to ensure the mechanical robustness of the engine assembly, sanr; sublimcntaires elements of reinforcement.

In the assembly of FIG. 2, the welding of the sheet metal frame is carried out by points, on an area with the ends of the plug being superimposed throughout the generator.

The frame can also be produced by head-to-head welding of the ends of the rolled strip or by other methods. The closing of the frame in zone a can also be carried out by reattaching the strip, crimps or joints, the frame can also be executed with a steel pipe having the corresponding dimensions and thickness.

The three types of cooling fins 2,2 'and 2 "differ from each other by their length, this being a function of other elements which are fixed on the cylindrical part 1; the fixing supports of the pad 3 and 3', the supports of the box at terminals 5, etc.

The cooling fins 2,2 ′ and 2 ″ are fixed to the cylindrical part 1, for example by welding, individually - piece by piece - or in a group of two or more cooling fins.

The pad fixing supports 3 and 3 ′ are executed in stamped and folded sheet steel and then fixed on the cylindrical part 1 by usual proeedées such as for example by welding, screws, etc. In the assembly zone with the shoe 4, the fixing supports 3 and 3 'have two ridged surfaces b and two oval holes c nar which these will be assembled by the screws 6 with the shoe 4 which also has holes made (not figured) in the assembly area with the supports 3 and 3 '. The oval holes c of the supports 3 and 3 'of the shoe 4 are thus executed so that the longitudinal axis of the oval holes c of the fixing supports 3 and 3' of the shoe 4 is perpendicular to the corresponding axis - the longitudinal axis - of the oval (nongigured) holes in the pad assembly area 4. In pad 4, mounting holes d of the ME electric motor are made.

The shoe 4 and the fixing supports 3 and 3 ′ have a special construction which,

combination with the shape and position of the oval holes (not shown) in the pad assembly area 4, with the fixing supports 3 and 3 'and the shape and position of the oval holes c of the fixing supports 3 and 3' of the shoe 4, during the assembly of the shoe 4 with the fixing supports 3 and 3 'to compensate for the errors of shape and position resulting from the execution and the mounting of the supports 3 and 3' and of the shoe 4 and at the same time the execution of an adjustment of the position of the shoe 4 with respect to the axis 7 of the electric motor ME as well as by directly mounting a template rib A_between the axis of the motor ME and the surface of base of the shoe 4-and a fixing rib B- between the shoulder of the end of the axle 7 and the fixing holes d of the ME motor executed in the shoe 4.

The supports of the terminal box 5 are also executed in stamped and folded sheet steel and fixed to the cylindrical part 1 by usual methods.

The ME electric motor can still have, according to the figure

1 a terminal box 8 in which the ends of the windings are brought out, a fan cover 9 which covers the fan (not configured) a rotor (not configured) having the axis 7.

Certainly, compared to the construction of the electric motor (with shoe, with shoe and flange shield, with flange shield or another construction) - the electric motor may or may not be provided with fixing supports 3 and 3 'of the shoe 4 and with skate 4. As

is provided in Figure 4, each cooling fins 2, 2 'and 2 "has deep drawing and longitudinal, distributed on a single line, which alternate with smooth zones f; at one end there is a bearing g

imposed by fixing the fan cover. Obviously, this bearing may or may not exist on the cooling fins, depending on the manner of fixing the fan cover. Certainly, the stamping zones e can be stored along the cooling fins 2.2 ′ and 2 "sometimes in a longitudinal or transverse position, sometimes on a single line path, or on several lines; the smooth zones f can be either curved or flat, depending on existing technological possibilities.

The cooling fins 2,2 ′ and 2 ″, according to the exemplary embodiments of FIGS. 5 to 17, are mounted on the cylindrical part 1 of the motor casing by trim zones h1, h2 which can result in the surface h11 and h21, curface of the trim on the cylindrical part, longitudinal or transverse grooves or cuttings (ncnfigured) which improve the thermal contact between the fins 2, 2 'and 2 "and the cylindrical part 1.

The stampings are carried out along the fins with the aim of ensuring mechanical robustness and

increase the heat transfer area.

Each of the fins 2, 2 'and 2 "can be produced individually or in groud, in five construction variants.

In a first variant, as is provided in figure no.5, each of the fins 2,2 ′ and 2 "has two zones h1 of attitude on the cylindrical part 1, the zones h1 having a curvature of radius R which continues the curvature of the cylindrical part 1 of the engine mount. The zones h1 continue on the adjacent dimensions with a lateral surface j1 which forms an angle α 1 with the zones h1 and which are united in the upper part by ixne other surface k1 which forms an angle α 2 with the lateral surface j1. Along the lateral surfaces j1 and the surface k1 which connect them, the stamped areas e are executed which alternate with the smooth areas f (not shown)

In this constructive variant, in section

transverse, each of the fins 2,2 'and 2 "resamble to a letter Ω (omega). In a second constructive variant, in accordance with FIG. 6, each of the fins 2,2 ′ and 2 "has a zone h1 of attitude on the cylindrical part l, zone h1 having a curvature of radius R which continues the curvature of the part cylindrical 1. The area h1 continues on a dimension with a lateral surface j2 which forms an angle α 1 with the area h1.

along the lateral surface j2, the stamping zones e are executed which alternate with the smooth zones f (not shown)

In this constructive variant, in cross section, each of the fins 2,2 'and 2 "resemble the letter L or the letter L reversed

In the third constructive variant, conforming to the exeraple presented in FIG. 7, each of the fins 2,2 ′ and 2 "has an area h1 of attitude on the cylindrical niece 1, the sone h1 having a curvature of radius R which continues the curvature of the cylindrical picce 1. The zone h1 continues on the two sides with two lateral surfaces j3 which make an angle α1 with the zone h1. Along the lateral surfaces j3 are executed the smoothed zones e which alternate with the smooth zones f (not shown).

In this constructive variant, in cross section, each of the fins 2, 2 'and 2 "resemble the letter U.

In a fourth constructive variant, shown in FIG. 8, each of the fins 2, 2 ′ and 2 "has an area h1 of attitude on the cylindrical part 1, the area h1 having a curvature of radius R which continues the curvature of the cylindrical part 1. The sone h1 continues on one of the sides with a lateral surface j4, which makes an angle of α 1 with the zone h1, the lateral surface j4 continuing with another surface k2 which makes an angle α 2 with the lateral surface j4.

Along the lateral surface ace j4 and the surface k2 are executed the trimmings e which alternate with the smooth areas f (not shown).

In this constructive variant, in cross section, each of the fins 2, 2 'and 2 "resemble the letter Z or the letter Z reversed

Σ

In a fifth constructive variant, presented in FIG. 9, each of the fins 2, 2 ′ and 2 "has two zones h1 of attitude on the cylindrical part 1, the zones h1 having a curvature of radius R which continues the curvature of the cylindrical part 1 of the engine mount. The zones h1 continue on the adjacent dimensions with a lateral surface j5 which makes an angle α 1 a with the zone h1 and the lateral surfaces j5 are joined

in the upper part by a face k3 which forms an angle α 2 with the side faces j5 and which has or are several opdulations 1. On the side faces j5 are executed the

stampings e which alternate with the smooth zones f

(not shown) and the face k3 has a wavy surface (one or

several undulations 1).

In this constructive variant, in the case where the

force k3 has a single undulation, with the concavity at the top, according to FIG. 9, in cross section, each of the fins 2, 2 ′ and 2 "resemble the letter M.

A gromp of the fins 2, 2 'and 2 "presented in

several embodiments in the figures lo until 17 is formed by fins m, each of the fins m being executed in one of the five variants presented for the individual fins, having along their surface the stampings e which alternate with the areas

smooth f

and being linked by connecting bridges n.

In a first constructive variant of a group of fins 2, 2 ′ and 2 "according to FIGS. Lo and 11, the fins m are placed in parallel, one on a side o of a hole p from which it is cutting, each fin m having an area h2 of trim which is located in the plane of the lacquer r of lacquer, the group of

fins 2, 2 'and 2 ", which continues with a side face j6 which makes an angle α 1 with the sone h2, the zones of seat h2 of the fins being joined at the ends, in the plane of the plate r, by the connecting bridges n.

Along the side faces j6 are executed the stamped areas e which alternate with the smooth areas f.

In this constructive variant, in cross section, each of the fins m looks like a letter L or the letter L reversed

Obviously, for a good attitude on the cylindrical part 1 of the motor frame, the group of fins 2, 2 'and 2 "has the areas h2 of attitude for the fins m and the connecting bridges n between the slllettes, curved according to the ravon R which continues the curvature of the cylindrical part 1.

In a second constructive variant of a group of fins 2, 2 'and 2 ", known in FIGS. 12 and 13, the fins m are located two by two on the sides o of the hole p from which they are of couplings, two neighboring fins m having a common plate h2 which is therefore the plane of the plate r from which the group of fins 2, 2 'and 2 "is executed and which continues on 1st two opposite sides with a lateral surface j7 which forms an angle α 1 with the zone h2, the zones h2 of the fins m being connected to the extremities, in the plane of the plate r by the connecting bridges n.

Along the side faces j7 are executed the stamped areas e which alternate with the smooth areas f.

In this constructive variant, in cross section, two fins joined by the trim area h2 resemble the letter U.

Certainly, for a good trim on the cylindrical part 1, the group of fins 2, 2 '2t 2 "has the trim areas h2 of the fins and the connection n n between the fins, curved according to a raven R which nursuit the -

bure of the cylindrical part 1. In a third constructive variant of a group of fins 2, 2 'and 2 "as shown in FIGS. 14 and 15, the fins m are replaced one by one on a side o of the hole p from which are uncut, each fin m having a trim area h2 which is in the plane of the plate r from which the croup of the fins 2, 2 'and 2 "is executed, the trim area h2 continuing with a lateral face j8 which makes an angle α1 with the zone h2 and which continues with another face k4 which makes an angle α 2 with the lateral face j8. The attitude zones h2 are joined in the plane of the plate r for the connecting slopes n. Along the side face j8 and the face k4 are drawn stampings e which alternate with the smooth areas f.

So this constructive variant, in transverse section, each fin m looks like the letter Z or the letter Z reversed

For a good attitude on the cylindrical part 1 of the engine frame, the group of fins 2, 2 'and 2 "has the areas h2 of attitude of the fins m and the connecting bridges n between the fins m curved by a radius R which continues the curvature of the cylindrical part. 1.

In a fourth constructive variant of a group of fins 2,2 ′ and 2 "as is provided in FIG. 16, the fins m are formed by corrugation of the sheet metal plate r, in such a way that the fin is continuous on a side l

ra veins by trim areas h2 with a face j9 which forms an angle α1 with the areas h2 and which are joined by the upper part by another face k5 which forms an angle α 2 with the lateral surfaces j9. The opposite flanks t of the attitude zones h2 are continuous with the lateral faces of the adjacent fins, in such a way so that the fins m are joined together by common h2 attitude zones. On the side faces j9 and on the faces k5 are executed the stamped zones e

(not shown) which alternate with- the smooth areas f.

Let us give this constructive variant, in frontal view each of the fins m resembles the letter Ω (omega).

For a good attitude on the cylindrical part 1 of the engine frame, the attitude zones h2 have a curvature R (not figured) which continues the curvature of the cylindrical part 1.

In a fifth constructive variant of a group of fins 2, 2 'and 2 "as is presented in FIG. 17, the fins m are formed by the corrugation of the sheet metal sheet r as well as a fin m is

formed by two trim zones h2 which continue on an adjacent side s with a side face j10 which forms an angle α 1 with the zones h2 and which are joined to the part su. erieure by a face k6 which forms an angle α 2 with the side faces j10.

Along the lateral faces j10, the stamped zones e (nonfigured) which alternate with the smooth zones f are executed, and the face k6 has the corrugated surface comprising one or more corrugations 1.

The opposite sides t of the trim areas h2 are

designed with the lateral surfaces of the neighboring fins as well as the fins m are joined together by the common placement areas h2.

In this constructive variant, in the case where the surface k6 has a single undulation with the concavity at the top, according to FIG. 17, each of the fins m resembles the letter M.

Certainly for a good attitude on the cylindrical part 1 of the frame of the actor, the attitude zones h2 have a curvature of radius R (not shown) which continues the curve of the cylindrical part 1.

According to the presentation in the exemplary embodiment of FIG. 1, the frame of the ME electric motor also includes a fixing pad 4 of the ME electric motor and supnorts fixing 3 and 3 'of the shoe 4 on the cylindrical niece 1 of the frame of the ME electric rotator.

Certainly, the fixing supports 3 and 3 'and the shoe 4 may or may not exist on the frame of the electric motor, depending on the manner of fixing this motor.

The fixing supports 3 and 3 ′ of the shoe 4, presented in the example of embodiment in FIG. 2, 3.18 and 19 are executed in sheet steel ectamped and folded as well as each fixing support 3 and 3 ′ is formed by a plate area u on the cylindrical part 1

electric

ME, having a curvature of radius R which continues the curvature of the cylindrical part 1 of the frame of the motcur ME and by another zone v folded at an angle α 3, usually complementary to the angle α 3 formed between the axis vertical Y of the motor frame ME and the radius R ', led into the tlieoretic point of folding z of the supports 3 and 3', in such a way that after the fixing of the supports 3 and 3 'on the cylindrical part 1 of the motor frame, the areas v of the fixing supports 3 and 3 ′ are parallel to the vertical axis Y of the cylindrical part 1 of the frame of the electric motor ME.

The fixing supports 3 and 3 ′ are fixed to the cylindrical part 1 of the frame of the electric motor ME by usual procedures such as for example - welding, then on the zones v the assembly is carried out with the pad 4.

For the purpose of assembling the fixing supports 3 and 3 ′ with the shoe 4, as shown in FIG. 3 and 19, the area v of the fixing supports 3 and 3 ′ includes fixing ears v1, in which they are executed oval holes c having a longitudinal axis y and which, thanks to the ovality allow the adjustment in the direction of the longitudinal axis y of the position of the pins yes are assembled by screws or other assembly elements by the holes oval c.

To ensure against displacement, during engine operation, of shoe 4 with respect to

fixing 3 and 3 ', around the oval holes c of the ears of fixing v1 of the fixing supports 3 and 3 ', on the contact surface v'1 with the shoe 4, cross grooves b are executed.

For the purpose of directing by rtontage the template and fixing ribs imposed for the motor, according to the representation in FIG. 2, the fixing supports 3 and 3 ′ are made of sheet metal having different thicknessers v2 and v3, as well as the mounting brackets 3 cmplcicées on one side of the vertical axis of symmetry Y of the motor frame, exseuterated. in sheet metal having the large thickness v2 ensure the mechanical resistance of the assembly, while the supports 3 'placed on the other part of the vertical axis of symmetry Y of the motor frame, executed in sheet metal of small thickness v3 take by deformation the errors of form and position resulting from the execution and the mounting of the supports 3 and 3 'and of the satin 4.

In accordance with the presentation in the example of embodiment of the skate, in FIGS. 20, 21 and 22 the skate 4 is executed with a sheet plate r1 in which plate areas d1 are executed which form the plate surface

of 1 of the pad 4 and the fixing ears w of the pad 4 on the respective fixing supports 3 and 3 ′ on the fixing ears v1 thereof.

In the areas where the troures are executed for fear of fixing the motor.

In order to clear the trim areas d1 of the engine relative to the rest of the pad 4, in these areas performs some fine stampings o 'and to ensure the plancité of the trim surface of 1 of the pad, on the faces d11 opposite to the plate faces d12 of the attitude zones d1, crossed grooves b 'are executed simultaneously with the fixing holes d of the engine.

The fixing ears w of the shoe 4 on the fixing supports 3 and 3 'are executed by cutting on 3 sides r'1, r'2, and r'3 and folding on the non-cut side r'4 at an angle α 4 in the part opposite to the trim surface of 1 of natin 4, as well as, after cutting, we find the fixing ears w, holes p ′ in the sheet metal plate r ′ and connecting bridges n ′ which mechanically link them, longitudinal and transverse, the plate sones d1 and the fixing ears w of the shoe 4.

For the mechanical reinforcement of the pad 4, along the connecting bridges, ribs n "are executed.

To assemble the shoe 4 with the fixing supports 3 and 3 ', in the fixing ears w are executed oval holes c' having a longitudinal axis x which, thanks to the ovality allow during assembly, to adjust on the direction of the longitudinal axis x of the oval holes c ', the position of the marks which are assembled by screws or by other assembly elements, in the oval holes c'.

In order to ensure against displacement during the operation of the skate motor 4 in relation to the fixing supports 3 and 3 ', around the oval holes c' on the contact surface w1 with the fixing supports 3 and 3 'on can

run cross streaks (not shown).

For the purpose of directly carrying out by mounting the dimensions and fixing ribs imposed for the dimensioner, according to the representation of the assembly detail of figure 23, there is provided the possibility of adjustment on two axes pernendeculairos x and y of the position of the pad 4 relative to the fixa tien supports 3 and 3 ', because the oval holes c' of the fixa tloaw ears of pad 4 have the longitudinal axis x perpendicular to the longitudinal axis y oval holes c fixing plates v1 of the fixing supports 3 and 3 ', as well as during the mounting of the pad 4 must be possible to adjust the position of the pad 4 relative to the fixing supports 3 and 3', respectively relative to the engine mount.

Taking into account that the errors of form and position resulting during the execution and the weaving of the fixing supports 3 and 3 'and the shoe 4 are supported by the construction of the fixing supports 3 and 3' and the shoe 4 proposed by the invention, and also that the construction allows adjustment during assembly of the position of the shoe 4 with respect to the mounting support 3 and 3 ', respectively with respect to the frame of the electric motor ME, according to the representation of FIGS. 1 and 23, the dimensions of the gauge - side A- and of fixing - side B - imposed on the electric motor ME are made directly by mounting, no longer necessary

the subsequent machining of the pad 4 of the electric motor ME.

The invention has the following advantages;

- ensures a good

thermal contact of the frame with the pack of statoriqaes sheets and a large surface of release towards the outside of the heat developed by the motor, reason for which the invention can be applied on all types of electric motors in open, closed or waterproof, whatever the power and its size.

- ensures the appropriate mechanical robustness of the engine under conditions in which the consumption of materials - sheet metal - for the mechanical structure of the engine frame is minimal.

- ensures the reduction of specific consumption of loss-making materials or large consumers of energy (aluminum and its alloys, winding conductor, electrotechnical sheet).

- ensures the realization of dimensions of size and fixing of the engine, without additional maneuver of machining of the pad, in order to Ηminate the errors of shape and position during the execution and the assembly of the engine.

- ensures the reduction of specific energy consumption.

- provides a -simple construction

- Using standard technologies, construction is carried out under conditions of productivity comparable with known constructions.

- eliminates difficult working conditions, such as working conditions in aluminum and cast iron foundries or in workshops for machining cast iron.

Claims

1. Sheet metal frame for electrical rctcars, intended to be used mainly in the construction of three-fold asynchronous electrical meters, composed mainly by the cylindrical piece of sheet steel with cooling fins on sheet steel, fixed on this meta-cylindrical cylindrical piece on the cylinder, it is also possible to fix skate finishing supports, executed in sheet steel, on the ones we assemble a motor fixing tin, executed also in sheet steel daraeterized by the fact that in order to achieve a good satisfaction of the heat developed by the electric meter, has cooling alllettes (2, 2 'and 2 ") in sheet metal having the same length or different lengths which have dar the longitudinal surfaces of stamped areas (e) longitudinal or transverse, interlocked on donkey or several lines, which alternate with smooth areas (f) flat or curved, fins (2, 2 'and 2 ") being fixed ées on the cylindrical part (1) by der trim zones (h1, h2) individually - part by i species or in greup, cooling fins (2,

2 'and 2 ") consisting of deun or more fins (-) mechanically linked together by connecting bridges (n) and by the attitude zones (h2) the attitude zones (h1, h2) which may have on the faces (h11, h12) by which they are seated on the cylindrical part (1) of the ridges or stampings longi tudinalen or transverse and it may have had a left fixing support (2) and a right fixing support (3 ' ) a shoe (4) for fixing the actor (ME) to which, in order to achieve

directly by mounting the bulkhead (A)

between the year (B) of the electric metering device (ME) and the attitude surface (d1) of the atin (4) and of the fixing brackets (B) on the shoulder of the top of the shaft (7) of the meting device ( hB) and the trour

the stamped zones (e) alternate with the smooth zones (f).

3. Frame according to the claim characterized in that each of the fins (2, 2 ', 2 ") has a flat area (h1) on the cylindrical part (1) of the castor's frame, an area which has a radius curvature (R) which continues the curvature of the cylindrical part (1) and which continues on one side with a lateral curface (j2) which makes an angle (α 1) with the area (h1), along the surface (j2) being executed the trapped areas (e) which alternate with smooth zenos (f).

4. Frame according to claim 1, characterized in that each of the other parts (2, 2 ′ and 2 ") comprises a zone (h1) of trim on the cylindrical part (1) of the frame of the electric meter, zone which has a curvature of radius, (R) which continues the curvature of the celindric piece (1) and which continues on the two ribs by two lateral surfaces (j3) which make an angle (α 1) with the trim zone (h1) and along which execute the used areas (c) alternating with the smooth areas (f).

5. Frame conforming to claim 1- characterized in that each fin (2, 2 'and 2 ") has a trim zone (h1) on the part cplindrirpαe (1) of the twin engine (ME) which has a radius curvature (R) which continues the curvature of the cylindrical part (1) and which continues on one of the sides with a lateral face (J4) which produces a naple (α1) with the trim zone (h1) and which continues with one on the other face (k2) which achieves an angle (α 2) with the lateral face (j4) along the lateral face j (4) and the face (k2), extinct executed the embopatiscated areas (e ) alternating with the lip areas (f).

6. Frame according to claim 1, characterized in that each of the fins (2, 2 'and 2 ") has two trim zones (h1) on the cylindrical part (1) of the frame of the electric motor (ME) , which has a curvature of radius (R) which continues the curvature of the cylindrical niece (1), an area which continues on the adjacent sides with a lateral face (j5) which forms an angle (α 1) with the trim areas ( h1) and which has executed stamped zones along its length (e) alternating with the smooth zones (f), at the upper part, the lateral faces (j5) being joined by another face (k3) forms an angle (α 2 ) with the lateral faces (j5), the face (k3) being undulated by one or more undulations (1).

7. Frame according to claim 1, provided with cooling fins according to claims 2 and 6, characterized in that, in order to simplify the fixing of the fins (m) on the cylindrical part (1) of the electric motor frame ( ME), these fins (m) are made from the same sheet metal plate (r), making a group of fins (2, 2 'and 2 ") which are mechanically joined together by plate surfaces (h2)

8. Frame according to claim 1, provided with cooling fins according to claims 3 and 4, 5, characterized in that for the purpose of simplifying the fixing of the fins (m) on the cylindrical part (1) of the electric motor frame (ME) these fins (m) are made of the same sheet metal plate (r), in a group of fins (2, 2 'and 2 ") which are joined mechanically to each other by plate surfaces (h2) and by connecting bridges (n) which have a curvature of radius (R) which continues the curvature of the cylindrical part (1) of the frame of the electric motor (ME) on which are fixed.

9. Frame according to claim 1, with engine mounting shoe and shoe mounting supports made of sheet steel, characterized in that, for the purpose of releasing the trim surface (of 1) of the rest of the pad surface (4) and in order to ensure the flatness of the trim surface (of 1) the pad (4) is provided, around the holes fixing (d) of the electric motor (ME), with trim areas (d1) in which light stampings are carried out (e ') to release these trim areas (d1) from the rest of the shoe (4) and can still execute a flatness of this trim zone (d1) by streaks

ribs (b ') executed at the same time with the fixing holes (d), on the surface (d11) opposite to the trim surface (d12) of the trim zones (d1), for the purpose of fitting with the fixing supports (3 and 3 ') of the same plate (r') of which we execute the pad (4), we still execute, by stamping on 3 sides (r'1, r'2, r'3 ) and by folding on the uncut side (r'4), fixing ears (w) of the shoe (4) provided with oval holes (c ') around which, on the contact surface (w1) with the supports fixing (3,3 ') may be provided crossed grooves having the purpose of ensuring against displacement during operation of the engine, of the shoe (4) relative to the fixing supports (3, 3') and the ears of attachment (w) and the trim areas (d1) are mechanically joined together by connecting bridges (n ') in which ribs (n ") are made for the mechanical reinforcement of the shoe (4), ribs which can also be exe cut for the same purpose in the fixing ears (w) of the shoe (4).

10. Frame according to claim 1, with engine mounting pad and pad mounting brackets made of sheet steel, characterized in that the mounting brackets (3, 3 ') of the pad (4) have an area plate (u) on the cylindrical part (1) of the electric motor frame (ME), curved according to a radius (R), which continues with another zone (v) folded at an angle (α 3) usually complementary to the angle (α 3), executed between the vertical axis (Y) of the frame (1) of the electric motor (ME) and the radius (R ') led to the theoretical folding point (z), from which begins the folding of the fixing supports (3, 3'), zone (v) provided with fixing lugs (vl) in which, for the purpose of carrying out the assembly with the shoe (4), oval holes are made (c) around which, on the contact surface (v'I) with the shoe (4) it is also possible to execute cross grooves (b) having the role of ensuring the pad against displacement during the operation of the scorer, relative to the fixing supports (3, 3 ′) and to obtain the mechanical reinforcement of the fixing supports

(3, 3 ') we can still execute ribs in the area (v) and in the fixing ears (v1).