WO2008046171A2

WO2008046171A2 - System for affixing an electric connector to an electric motor

Info

Publication number: WO2008046171A2
Application number: PCT/BR2007/000281
Authority: WO
Inventors: Eduardo Luiz do ROSÁRIO; Alessandro Schoffen ROMÃO
Original assignee: Whirlpool S.A.
Priority date: 2006-10-20
Filing date: 2007-08-19
Publication date: 2008-04-24
Also published as: WO2008046171A3; BRPI0604685A

Abstract

The invention refers to a system for affixing an electric connector to an electric motor of the type mounted in a supporting structure and having a stator (10) formed by a lamination stack (11) of overlapped laminations housing coil windings (12), said electric connector (20) comprising an electric insulating base body (21) seated against an end lamination (11a) of the lamination stack (11). The system for affixing an electric connector to an electric motor of the present invention comprises: a lock means (30) carried by at least one of the laminations of the lamination stack (11), externally to an adjacent end lamination (11a) of the lamination stack (11); and a lock receiving means (40) carried by the electric connector (20) and to be fitted in the lock means (30), so as to immobilize the electric connector (20) seated against said adjacent end lamination (11a) of the lamination stack (11).

Description

"SYSTEM FOR AFFIXING AN ELECTRIC CONNECTOR TO AN ELECTRIC MOTOR" Field of the Invention

The present invention refers to a system for affixing an electric connector to an electric motor, particularly of the type used in refrigerating compressors, more particularly, compressor constructions in which an assembly formed by a cylinder block and by the electric motor is mounted in the interior of a hermetic shell surrounding said assembly. The present invention is particularly applied to a construction in which the assembly formed by the cylinder block and by the electric motor is mounted in the interior of the hermetic shell surrounding said assembly, maintaining the latter suspended by a spring system. Background of the Invention

Electric motors, for example of the type used in refrigerating compressor, generally comprise a rotor and a stator, the latter being formed by a main coil and a secondary coil, said electric motor being fed by electric current from a power source, external to a supporting structure in which the electric motor is mounted, by an appropriate wiring electrically connected to the stator of the electric motor.

When applied in a refrigerating compressor, the electric motor is mounted in the interior of a hermetic shell. In these constructions, the connection of the stator to the electric current power source, external to the hermetic shell, occurs by connecting an appropriate wiring to a plug mounted outside the hermetic shell and which is electrically connected to the stator of the electric motor. In a known construction, for connecting the stator to the plug of the hermetic shell, through the interior thereof, some copper wires of the stator, generally three, are connected to a cable by clamping a pressable metal piece, which joins each copper wire to the cable which is subsequently connected to the shell. After clamping the two pieces together, for each wire, the assembly formed receives a thermoretractile insulating cover, which protects the obtained connection. After the connection has been completed, the whole assembly is positioned in the interior of the coils that form the motor.

This construction presents some disadvantages, such as difficult automation, for example in the clamping steps, also resulting in low quality of the electric connections obtained, with a high level of defects and rejections, for example, by not obtaining the desired reliable connection due to failures in the process for obtaining said connection.

In other known construction, the electric connections from the electric motor to the compressor shell occur through an electric connector which receives each copper wire from the motor coils, to be electrically connected to the plug in the compressor shell, said electric connector housing each wire in a respective contact cradle. Although this solution allows automation and improves the quality of the electric connections between the motor and the hermetic shell of the compressor as compared to the electric connections obtained by the clamping technique, it still presents deficiencies regarding the way said electric connector is retained within the hermetic shell of the compressor.

One of the deficiencies of the known solutions refers to the need to maintain the positioning of the electric connector in relation to the stator of the electric motor, preventing vibrations and displacement of said electric connector in relation to the stator, and therefore that the electric connections be negatively effected, at least upon displacement of the electric motor-shell assembly of the compressor, when being handled in the compressor mounting operations in the assembly line. For these displacements in the assembly line, there are known some solutions for the provisional fixation of the electric connector to the stator, which use an additional mounting device, requiring an additional operator in the compressor assembly line. Besides the fact that these solutions are not actually reliable, since they allow the disengagement of the electric connections, they raise the cost of the compressor mounting operations, not only by requiring an additional device to be used in this temporary fixation of the electric connector to the stator, but also by requiring additional operators in the assembly line to carry out this provisional fixation.

Summary of the Invention

It is an object of the present invention to provide a system for affixing an electric connector to an electric motor, which guarantees maintaining a relative positioning between said electric connector and the stator of the electric motor, maintaining unaltered the electric connections between the stator coil wires of the electric motor and the supply conducting wires of said electric motor. It is an additional object of the present invention to provide a fixation system, as cited above, which in the case of mounting the electric motor and the electric connector to a hermetic refrigerating compressor, guarantees maintaining the relative positioning between said electric connector and the stator of the electric motor throughout the production steps in the assembly line of the refrigerating hermetic compressor.

An additional object of the present invention is to provide a fixation system, as cited above, which does not require additional mounting elements, utilizing those already available in the compressor, and which further allows reducing the number of operators actuating in the assembly line. Another object of the present invention is to provide a fixation system, as cited above, which presents a reduced cost.

These and other objects of the present invention are achieved with the provision of a system for affixing an electric connector to an electric motor of the type mounted in a supporting structure and having a stator formed by a stack of overlapped laminations housing coil windings, said electric connector comprising an electric insulating base body, seated against an end lamination of the lamination stack, said system comprising: a lock means carried by at least one of the laminations of the lamination stack, externally to an adjacent end lamination of the lamination stack; and a lock receiving means carried by the electric connector and to be fitted in the lock means, so as to immobilize the electric connector seated against said adjacent end lamination of the lamination stack. In a more specific form, the present solution provides a system for affixing an electric connector to an electric motor of the type mounted in a supporting structure defined by a shell of a refrigerating compressor, said lock means comprising a support member affixed to the stator and coupled to the supporting structure of the electric motor, for example, through a suspension means, such as springs. Brief Description of the Drawings

The invention will be described below, with reference to the enclosed drawings, given by way of example of an embodiment of the invention and in which:

Figure 1 schematically represents, in a longitudinal sectional view, a hermetic compressor of the reciprocating type, with a vertical shaft and mounted in the interior of a shell through a suspension means with helical springs;

Figure 2 schematically represents a lower perspective view of the electric motor stator of figure 1, before the electric connector is seated and affixed to said stator; Figure 3 schematically represents a lower perspective view of the electric motor stator, similar to that of figure 2, illustrating a construction of electric connector seated against an end lamination of the lamination stack of the stator, before affixing said electric connector to the stator;

Figure 4 schematically represents a lower perspective view of the electric motor stator, similar to that of figure 3, said stator carrying the electric connector and with the support member being positioned to be coupled to the stator, according to a way of carrying out the present invention;

Figure 5 schematically represents a lower perspective view of the electric motor stator, similar to that of figure 4, said stator carrying the electric connector and the support member, and with the lock means being fitted in the lock receiving means;

Figure 6 schematically represents, in a longitudinal sectional view, the stator carrying the connector and affixing the support member, in the region in which the lock means is fitted in the lock receiving means, according to a way of carrying out the present invention;

Figure 7 schematically represents a top plan view of a support member construction of the present invention;

Figure 8 schematically represents a top plan view of another support member construction of the present invention;

Figure 9 schematically represents, in a cross- sectional view, according to line IX-IX in figure 7, the support member region illustrated in figure 7 and provided with the lock means constructed according to a way of carrying out the present invention; Figure 10 schematically represents an upper perspective view of another lamination construction of the lamination stack of the stator, carrying another constructive variant for the lock means, for affixing the electric connector to the stator; Figure 11 schematically represents a cross-sectional view of the stator carrying and affixing the electric connector, in the region in which the lock means is fitted to the lock receiving means, said lock means being constructed according to the embodiment of the present invention illustrated in figure 10; and Figure 12 schematically represents a partial cross- sectional view of other lock means construction of the present invention, actuating in a lock receiving means provided in the electric connector and constructed according to the present invention. Description of the Illustrated Embodiments

Although the concept described herein is applied for mounting, to a supporting structure, electric motors of the type presenting a stator 10 comprising a lamination stack 11, formed of overlapped laminations housing coil windings 12, the present solution will be described considering a supporting structure in the form of a shell 1 of a refrigerating compressor. It should be understood that this does not restrict the applicability or the scope of the present invention. The same can be said in relation to the embodiment presented in the drawings . The invention aims to protect the principle and not the specific application or constructive form. The electric motor is fed by electric current from a power source (not illustrated) , through an electric connector 20 which receives each copper wire from the coils 12 of the stator 10, housing each of said wires in a respective contact cradle (not illustrated) of said electric connector 20, and makes the electric connection of said copper wires of the coils 12 with a wiring electrically connected to the power source of the electric motor. In the constructions in which the electric motor is mounted inside the usually hermetic shell 1 of the compressor, the winding wires of the coils 12 of the stator 10 are connected to a plug 2 mounted outside the shell 1 of the compressor and which is electrically connected to the stator 10 of the electric motor.

The electric connector 20 usually comprises a nonelectric conducting base body 21 particularly obtained in electric insulating material to be seated against an end lamination 11a of the lamination stack 11 of the stator 10. The base body 21 defines contact cradles, for joining electric wires of the coil 12 with the electric wires of the power source, and retaining means (not illustrated) which affix the electric connector 20 to the windings of the coils 12 of the stator 10. In a way of carrying out the present invention, the electric connector 20 is provided in plastic material, injected in a single piece, defining the base body 21 and a lower portion 22, which is, for example, seated onto the end lamination 11a of the lamination stack 11. The electric connector 20 presents a closing portion defined, for example, by a lid which can be affixed or incorporated to the base body 21 of the electric connector 20. In a way of carrying out the present invention, the lower portion 22 is incorporated in a single piece to the base body 21.

According to the present invention, the electric connector 20 is affixed to the stator 10 through a system for affixing an electric connector to an electric motor of the above-presented type, said system comprising: a lock means 30 carried by at least one of the laminations of the lamination stack 11, externally to an adjacent end lamination 11a of said lamination stack 11; and a lock receiving means

40 carried by the electric connector 20 and to be fitted in the lock means 30, so as to immobilize the electric connector 20 seated against said adjacent end lamination 11a of the lamination stack 11. In a constructive option of the present invention, the electric connector 20 is forcedly seated against the end lamination 11a of the lamination stack 11, by action of the lock means 30. In some constructions of the present invention, the lock means 30 is forcedly coupled to the lock receiving means 40 for example, by elastic deformation of at least one of the parts of lock means 30 and lock receiving means 40. This forced coupling defines an engagement between the lock means 30 and the lock receiving means 40 which continually forces the electric connector 20 against the lamination stack 11 and, more particularly, against the end lamination 11a of the latter. In a way of carrying out of this constructive option of the present invention, the lock means 30 has the form of a tongue 31 incorporated to the part that carries it, the lock receiving means 40 having the form of a housing 41 provided in the electric connector 20 and which receives and couples the tongue 31, upon fixation of said electric connector 20 to the stator 10. In a constructive particularity, the tongue 31 is carried by the end lamination 11a or by an adjacent lamination of the lamination stack 11, internal to the end lamination 11a. In this construction, the tongue 31 can be affixed or incorporated, in a single piece, to said end lamination lla or to a lamination of the lamination stack 11, internal to said end lamination lla. In a constructive variant of this solution, the tongue 31 projects from a plane containing an outer face of the adjacent end lamination lla of the lamination stack 11, opposite to that turned to and seated against an adjacent inner lamination of the lamination stack 11. In the case of the tongue 31 being affixed or incorporated to a lamination of the lamination stack 11 other than the end lamination lla, the projection of said tongue 31 beyond the plane containing the outer face of the end lamination lla occurs with the passage of said tongue 31 through a channel provided in the lamination stack 11 and defined by the alignment of a plurality of windows, each defined in a lamination of the lamination stack 11, external to that carrying the tongue 31. The tongue 31 presents a free end 31a that is fitted in a housing 41 defined in the lower portion 22 of the base body 21 of the electric connector 20, said tongue 31 being, for example, configured to be elastically deformed for introduction in the housing 41 and maintained therein, immobilizing and continually forcing the electric connector 20 against the lamination stack 11 of the stator 10.

According to a way of carrying out the present invention, illustrated in figures 10 and 11, the lock means 30 is defined by at least one lamination portion lie of at least one lamination of the lamination stack 11, each said lamination portion lie axially projecting beyond the end lamination 11a of said lamination stack 11 and defining, for example, a corresponding tongue 31. In the illustrated construction, at least one end lamination 11a of the lamination stack 11 presents, in its construction, lamination portions lie defined by a cutout in its surface, each cutout defining a respective opening and a tongue 31 of the lock means 30, said tongue 31 being incorporated, in a single piece, to a respective lamination of the lamination stack 11.

Each tongue 31 projects from the adjacent end lamination 11a of the lamination stack 11, to be fitted in a respective housing 41 of the lock receiving means 40, as already discussed above.

In a constructive option of the present invention to be described ahead, the lock means 30 is carried by a support member 50 affixed to the lamination stack 11 of the stator 10, seated against the end lamination 11a of said lamination stack 11 and which, in an illustrated constructive variant, is coupled to the supporting structure of the electric motor and, in other construction, also to be discussed ahead, defines a stop for the electric motor. In the constructions in which the lock means 30 is carried by the support member 50, as illustrated in figures 4-9, said lock means 30 comprises at least one tongue 31, which is affixed or incorporated, in a single piece, to said support member 50, projecting from a plane containing an outer face of the support member 50, opposite to that facing the lamination stack 11. As previously described, the tongue 31 is fitted in a housing 41 of the lock receiving means 40, defined in the electric connector 20. The support member 50 can be obtained, for example, in a material that is highly resistant to deformations caused by impacts, load, etc. such as a metallic material (iron, steel, etc.) . In the constructions in which the support member 50 is defined by one of the pieces usually employed in the compressor, such as a spring support or a stop for protecting the motor against impacts with- the shell, said support member is made of metallic material. The tongue 31 is, for example, provided in the form of a projection defined from a rear peripheral edge portion of the support member 50, facing the coil windings 12 of the stator 10, having a free end facing said coils 12 of the stator 10 and an opposite end coupled to the support member 50, for example, incorporated thereto.

In the construction in which the support member 50 is coupled to the supporting structure of the electric motor, said support member 50 is configured to receive and, for example, to secure, coupling means which allow mounting said support member 50 to the supporting structure.

In a way of carrying out the present invention, the support member 50 is the one that mounts the electric motor to the supporting structure thereof (figures 4- 7 and 9) , said mounting being effected through a suspension system 60 defining the means for coupling the support member 50 to the supporting structure of the electric motor. In this construction, the support member 50 sustains the electric motor, said assembly formed by the electric motor and by the support member 50 being seated onto the suspension system 60, which is seated on or affixed to the supporting structure. In a particular construction illustrated in the enclosed drawings, the suspension system 60 comprises an assembly of helical springs 61, each having an end seated on the supporting structure and an opposite end mounted to the support member 50. In the construction in which the supporting structure defines a shell 1, which surrounds a refrigerating compressor mounted therewithin and affixed to a lower portion of said shell 1, the suspension system 60 comprises helical springs 61, each having an opposite end to be coupled in a respective fitting portion 51 defined in the support member 50. In these constructions of support member 50, in which the compressor rests on an assembly of helical springs 61, said support member 50 comprises an elongated body 50a, presenting two end portions 50b, laterally spaced from one another, in each end portion 50b being defined a fitting portion 51 to receive an opposite end of a helical spring 61 of the suspension system 60. In this construction, the support member 50 is affixed to the stator 10 of the electric motor by appropriate means, such as screws 52, said support member 50 being obtained in a high-resistance material, such as metallic material (iron, steel, etc.) , so as to be able to sustain at least one electric motor in a reliable manner and without suffering deformations. In a construction for the support member 50 described herein, this incorporates each fitting portion 51, in a single piece, to the end portions 50b, further incorporating, in a single piece, to the elongated body 50a, the lock means 30 which comprises at least one tongue 31, for example, projecting from a plane containing an outer face of the elongated body 50a of the support member 50, opposite to that facing the lamination stack 11, for seating said support member 50 onto an adjacent end lamination 11a of the lamination stack 11.

The tongue 31 of the lock means 30 fits in a housing 41 of the lock receiving means 40, defined in the electric connector 20, such as already previously described.

In the illustrated construction, the refrigerating compressor is of the type which presents a vertical crankshaft, said compressor being provided with a suspension system 60, generally constituted by an assembly of helical springs 61, in order to insulate the vibrations of an assembly formed by the cylinder block 3 and the electric motor of said compressor, from the shell 1 of the latter. In the construction of support member 50 illustrated in the enclosed drawings (figures 4-9) , said support member 50 also actuates as a stop to prevent impacts of the electric motor against the supporting structure of the electric motor. In the case the supporting structure is the shell 1 of the compressor, said stop prevents impacts of the electric motor against the shell 1. In this case, the support member 50 is provided with side projections 53 each, for example being provided in the region of an end portion 50b of the support member 50 that defines a widening in the elongated body 50a of the support member 50, in a direction opposite to that facing the lock means 30, said side projections 53 radially projecting beyond a projection of the peripheral contour of the electric motor, defining a peripheral contour to the electric motor-support member 50 assembly, external to that of the electric motor and surrounding the latter, so that, in a condition of impact with the shell 1, said side projections 53 contact said shell 1 without allowing the contact of the electric motor with said shell 1. The suspension systems 60 of the motor-cylinder block assembly, for a refrigerating compressor with a vertical shaft, can be divided in two groups: damping using suspension springs and damping using compression springs.

In the constructive arrangement using suspension springs, the motor-cylinder block assembly is affixed to the shell 1 of the compressor, through metallic suspension springs, operating under tension. In the illustrated constructive arrangement, the suspension system 60 uses compression helical springs 61, which are mounted in an inner lower portion of the shell 1 of the hermetic compressor and disposed beneath an anchorage point of the motor-cylinder block assembly.

The anchorage points of the springs in the electric motor/cylinder block mechanical assembly 3 and in the shell 1 can present conceptions other than those illustrated regarding damping by compression. In the constructions in which the motor-cylinder block assembly is mounted suspended in the interior of the shell, the support member 50 takes the form of a stop (figure 8) usually seated on and affixed to an adjacent end lamination 11a of the lamination stack 11 of the stator 10 and used to avoid collisions of the stator 10 with the shell 1 of the compressor, during movements of the latter, or resulting from vibration coming from the compressor operation. In this construction, the support member 50 presents the side projections 53, but it may not present the fitting portions 51 in the constructions in which said support member 50 is not coupled to the helical springs 61 of the suspension system 60. On the other hand, in the constructions in which the support member 50 actuates for mounting the electric motor to the supporting structure and also actuates as a stop, the elongated body 50a of said support member 50 carries the fitting portions 51 and also the side projections 53. In the cases in which the support member 50 actuates only as an element for mounting the electric motor to the supporting structure, but not as a stop, the elongated body 50a of said support member 50 does not necessarily need to carry the side projections 53. According to a way of carrying out the present invention illustrated in the enclosed drawings, the support member 50 incorporates, in a single piece, the lock means 30 which comprises, for example, at least one tongue 31 incorporated to the support member 50 and which is adjacent and turned to the stator 10 and fitted in the lock receiving means 40. This embodiment of support member 50 occurs, in any of its possible constructive solutions, such as: the construction in which said support member actuates as an element for coupling the electric motor to the supporting structure, said support member 50 being, for example, a spring support usually employed for mounting, onto springs, the electric motor inside the shell of a refrigerating compressor; and the constructions in which said support member 50 actuates as a stop element to avoid impacts of the electric motor with the supporting structure. The tongue 31 is, for example, provided in the form of a projection defined from a rear peripheral edge portion of the support member 50, having a free end 31a facing the stator 10 and an opposite end coupled to the support member 50, for example, incorporated thereto. Although not illustrated, it should be understood that the lock means 30 can be in the form of a tongue 31 provided from the electric connector 20, or in the form of a tongue 31 defined from at least one end lamination 11a, or also considering other adjacent laminations internal to the end lamination 11a of the lamination stack 11.

In the constructive option illustrated in figures 4- 9, the lock means 30 comprises a single tongue 31 which is cut out and projects from a peripheral edge portion of the support member 50, which is spaced back in relation to the remainder of an adjacent peripheral edge of the support member 50 which defines the contour of the latter, said peripheral edge portion of the support member 50 being spaced back so that the free end 31a of the tongue 31 is at maximum contained in a plane defined by the remainder of the adjacent peripheral edge of the support member

50.

In these constructive options for a single tongue 31, the lock receiving means 40 is defined by a single housing 41 provided in the electric connector 20, for example, in the form of a blind or through hole defined in the lower portion 22 of the base body 21 of said electric connector 20, to receive and house a respective tongue 31. In the construction illustrated in figures 4-9, the tongue 31 projects from a plane containing an outer face of the support member 50, to be fitted in the housing 41 of the lock receiving means 40 defined in the electric connector 20, which is configured to receive and tightly fit the tongue 31 of the lock means 30, without a radial or an axial gap, forcing the electric connector 20, which is seated onto an adjacent end lamination 11a of the lamination stack 11 of the stator 10, against the coils 12 of the stator 10 and the end lamination 11a. The housing 41 is defined in the base body 21 of the electric connector 20, by a determined distance from a seating end of the lower portion 22 of said base body 21 to the lamination stack 11, which is for example slightly inferior to the distance between the free end 31a of the tongue 31 in relation to the plane containing the outer face of the support member 50, from which said tongue 31 projects. The small height difference between the housing 41 and the tongue 31 is determined so as to maintain unaltered the fitting between said parts .

With the construction of the present invention, the electric connector 20 affixed to the stator 10 is immobilized in relation thereto, avoiding the deficiencies existing in the prior art constructions. For affixing the electric connector 20 to the stator 10, said electric connector 20 is initially seated against the end lamination 11a of the lamination stack 11 (figure 3), and means for retaining said electric connector 20 to the stator 10 maintain the electric connector 20 coupled to the windings of the coils 12 of the stator 10 or to the lamination stack 11 of the latter.

According to the present invention, after the electric connector 20 is mounted to the stator 10, the support member 50 is taken to a mounting condition to the lamination stack 11 of the stator

10, as illustrated in figures 4 and 6, in which at least part of the extension of said support member 50 is seated against the end lamination 11a of the lamination stack 11. Upon seating the support member 50 on the end lamination 11a of the lamination stack

11, the tongue 31 of the lock means 30 carried by said support member 50 is fitted in the housing 41 of the lock receiving means 40 defined in the lower portion 22 of the base body 21 of the electric connector 20. In this fitting position between the lock means 30 and the lock receiving means 40, the support member 50 is affixed to the lamination stack 10, for example, through screws 52, defining a tight fixation between the electric connector 20 and the stator 10.

In another way of carrying out the present invention illustrated in the enclosed drawings (figure 12), the lock means 30 is defined by a lock element disposed through at least part of the axial extension defined by the seating of the laminations of the lamination stack 11, said lock element projecting beyond the end lamination 11a of said lamination stack 11, so as to receive and affix the lock receiving means 40. The lock element of this construction can be defined in the form of an end portion of a clamp 70, for affixing the laminations of the lamination stack 11, said end portion defining a tongue 31 of the lock means 30, to be fitted in a housing 41 of the lock receiving means 40, as already previously described. In another variant of this construction, the lock element is defined by an extension portion of the clamp 70, which affixes the laminations of the lamination stack 11, external to the end lamination 11a of the latter, said extension portion of the fixation clamp being in the form of a handle which receives and fits a coupling projection extending from the lower portion 22 of the electric connector 20 and which defines the lock receiving means.

With the construction of the system for affixing an electric connector to an electric motor of the present invention, the actuation of the lock means 30 in relation to the lock receiving means 40 results in immobilization of said electric connector 20 in relation to the stator 10, preventing relative movements between said parts of electric connector 20 and stator 10, in planes parallel and orthogonal to a plane containing the end lamination 11a of the lamination stack 11 and against which is generally seated said electric connector 20, guaranteeing permanently, the maintenance of the electric connections effected between the electric motor and the electric power source. With this construction, the electric connector 20 is affixed to the stator

10, with no need of providing a housing in the latter to receive said electric connector 20, as it occurs in some known prior art constructions which require the removal of conducting material for obtaining the desired fixation of the electric connector 20 to the stator 10. Moreover, for the fixation obtained with the present invention, there is no need to provide elements besides those already used for mounting the electric motor, or for mounting the latter to a supporting structure thereof, since in these cases it is common to use a support member 50 in one of the embodiments discussed herein.

Claims

1. System for affixing an electric connector to an electric motor of the type mounted in a supporting structure and having a stator (10) formed by a lamination stack (11) of overlapped laminations housing coil windings (12), said electric connector

(20) comprising an electric insulating base body

(21) seated against an end lamination (Ha) of the lamination stack (11) , characterized in that it comprises: a lock means (30) carried by at least one of the laminations of the lamination stack (11) , externally to an adjacent end lamination (Ha) of the lamination stack (11) ; and a lock receiving means (40) carried by the electric connector (20) and to be fitted in the lock means (30) , so as to immobilize the electric connector (20) seated against said adjacent end lamination (Ha) of the lamination stack (11) .

2. System, as set forth in claim 1, characterized in that the electric connector (20) is forcedly seated against said adjacent end lamination (Ha) of the lamination stack (11) by the lock means (30) .

3. System, as set forth in claim 1, characterized in that the lock means (30) comprises at least one tongue (31) incorporated to the part that carries it, the lock receiving means (40) being defined by a housing (41) provided in the electric connector (20), said tongue (31) being fitted in the housing (41) of the electric connector (20) .

4. System, as set forth in claim 3, characterized in that the housing (41) is provided in a lower portion

(22) of the electric connector (20) .

5. System, as set forth in claim 1, characterized in that it comprises a support member (50) affixed to the lamination stack (11) of the stator (10) and seated against an end lamination (Ha) of said lamination stack (11) , said support member (50) carrying the lock means (30) .

6. System, as set forth in claim 5, characterized in that the lock means (30) comprises at least one tongue (31) incorporated to the support member (50), the lock receiving means (40) being defined by a housing (41) provided in the electric connector (20) , said tongue (31) being fitted in the housing (41) of the electric connector (20) .

7. System, as set forth in claim 6, characterized in that the tongue (31) projects from a plane containing an outer face of the support member (50) opposite to that facing the lamination stack (11) .

8. System, as set forth in claim 6, characterized in that the housing (41) is provided in a lower portion (22) of the electric connector (20), seated onto the adjacent end lamination (Ha) of the lamination stack (H) •

9. System, as set forth in claim 5, characterized in that the support member (50) is coupled to the supporting structure of the electric motor.

10. System, as set forth in claim 9, characterized in that the support member (50) of the electric motor is coupled to the supporting structure through a suspension system (60) onto which is seated the support member (50) .

11. System, as set forth in claim 10, said electric motor being of the type used in a refrigerating compressor, characterized in that the supporting structure is defined by a hermetic shell (1) surrounding the compressor.

12. System, as set forth in claim 10, characterized in that the support member (50) defines fitting portions (51) for coupling the suspension system ( 60 ) .

13. System, as set forth in claim 12, characterized in that the suspension system (60) comprises helical springs (61) each having a mounting end to be coupled in a respective fitting portion (51) of the support member (50).

14. System, as set forth in claim 9, characterized in that the lock means (30) comprises at least one tongue (31) incorporated to the support member (50) , the lock receiving means (40) being defined by a housing (41) provided in the electric connector (20) , said tongue (31) being fitted in the housing (41) of the electric connector (20) .

15. System, as set forth in claim 14, characterized in that the tongue (31) projects from a plane containing an outer face of the support member (50) opposite to that facing the lamination stack (11) .

16. System, as set forth in claim 14, characterized in that the housing (41) is provided in a lower portion (22) of the electric connector (20), which is seated onto the adjacent end lamination (lla) of the lamination stack (11) .

17. System, as set forth in claim 5, characterized in that the support member (50) defines a stop for protecting the electric motor against impacts with the supporting structure of said electric motor.

18. System, as set forth in claim 17, said electric motor being of the type used in a refrigerating compressor, characterized in that the supporting structure is defined by a hermetic shell (1) surrounding the compressor.

19. System, as set forth in claim 17, characterized in that the lock means (30) comprises at least one tongue (31) incorporated to the support member (50), the lock receiving means (40) being defined by a housing (41) provided in the electric connector (20) , said tongue (31) being fitted in the housing (41) of the electric connector (20) .

20. System, as set forth in claim 19, characterized in that the tongue (31) projects from a plane containing an outer face of the support member (50) .

21. System, as set forth in claim 19, characterized in that the housing (41) is provided in a lower portion (22) of the electric connector (20), which is seated onto the adjacent end lamination (lla) of the lamination stack (11) .

22- System, as set forth in claim 5, characterized in that the support member (50) incorporates, in a single piece, the lock means (30) .

23- System, as set forth in claim 1, characterized in that the lock means (30) is defined by a lamination portion (lie) of at least one lamination of the lamination stack (11), said lamination portion (lie) axially projecting beyond the end lamination (Ha) of said lamination stack (11) .

24. System, as set forth in claim 23, characterized in that the lamination portion (lie) defines at least one tongue (31) incorporated to the lamination from which it projects, the lock receiving means (40) being defined by a housing (41) provided in the electric connector (20) , said tongue (31) being fitted in the housing (41) of the electric connector (20) .

25. System, as set forth in claim 24, characterized in that the tongue (31) projects from the adjacent end lamination (Ha) .

26. System, as set forth in claim 24, characterized in that the housing (41) is provided in a lower portion (22) of the electric connector (20) .

27. System, as set forth in claim 1, characterized in that the lock means (30) is defined by a lock element disposed through at least part of the axial extension defined by the seating of the laminations of the lamination stack (11) , said lock element projecting beyond the end lamination (lla) of said lamination stack (11) .

28. System, as set forth in claim 27, characterized in that the lock element is defined by an extension portion of a clamp (70) for affixing of the laminations of the lamination stack (11) .

29. System, as set forth in claim 28, characterized in that the lock element is defined by an extension portion of the clamp (70) , in the form of a tongue

(31) , externally projecting from a plane containing the adjacent end lamination (Ha) of the lamination stack (11) .

30. System, as set forth in claim 29, characterized in that the lock receiving means (40) is defined by a housing (41) provided in a lower portion (22) of the electric connector (20) and in which is fitted the tongue (31) of the clamp (70) for affixing the laminations of the lamination stack (11) .

31. System, as set forth in claim 1, characterized in that the electric connector (20) comprises a base body (21) which incorporates, in a single piece, a lower portion (22) in which is defined the lock receiving means (40) .

32. System, as set forth in claim 31, characterized in that the lock means (30) comprises at least one tongue (31) incorporated to the part which carries it, the lock receiving means (40) being defined by a housing (41) provided in the lower portion (22) of the electric connector (20) , said tongue (31) being fitted in the housing (41) of the electric connector (20) .

33. System, as set forth in claim 32, characterized in that the tongue (31) projects from a plane containing an outer face of the adjacent end lamination (Ha) .