WO2010049334A2

WO2010049334A2 - Segmented stator

Info

Publication number: WO2010049334A2
Application number: PCT/EP2009/063821
Authority: WO
Inventors: Ozkan Dalkilic; Hakan Gedik
Original assignee: Arcelik Anonim Sirketi
Priority date: 2008-10-30
Filing date: 2009-10-21
Publication date: 2010-05-06
Also published as: TR201102178T1; WO2010049334A3

Abstract

The present invention relates to a stator (1) which is the stationary part of the electric motor, comprising an exterior laminated stack (2) formed of laminations aligned one on the top of the other and an interior laminated stack (3) grouped concentrically inside the exterior laminated stack (2), a cylindrically configured yoke (4) forming the main body of the exterior laminated stack (2), pole teeth (5) arranged at regular intervals along the inner periphery of the yoke (4), main stator windings (7) placed at the pole teeth (5), a cylindrically configured core (8) forming the main body of the interior laminated stack (3), second pole teeth (9) arranged at regular intervals along the outer periphery of the core (8) and auxiliary stator windings (107) placed at second pole teeth (9).

Description

SEGMENTED STATOR

[0001] The present invention relates to the stator of an electric motor.

[0002] Electric motors are formed of a stationary part called the stator and a rotating part called the rotor. The stator comprises a magnetic laminated stator stack and stator windings made of copper wires wound around or placed in the winding slots. When the stator windings are placed in the slots, a substantial amount of the windings project out of the slots due to the structure of the slots and these windings named as end-windings create a considerable hindrance in the production of electric motors. In order to solve this problem, in some embodiments the stator is produced to be multi-pieced so that the processes of coiling - placing the windings is made easier, thereby aiming to keep the entire or a substantial amount of windings in the stator stack without projecting outside; but this time the volume allocated for the windings in the stator stack is insufficient or the volume allocated for the windings cannot be utilized efficiently. In the state of the art, when the stator (1 ') is produced in two pieces, with a laminated yoke (2') and a laminated star (3'), the stator windings (S) are either placed in the laminated yoke (2') or the laminated star (3') and spaces remain between the laminated yoke (2') and the laminated star (3'), in the section (B') wherein the windings (S) are assembled due to limitations in coiling or placing the windings (Figures 1 , 2).

[0003] The stator described in the European patent application no EP0849857, is made up of two pieces, an outer yoke laminations stack and an inner star package. The stator windings are placed on the pole teeth of the star package.

[0004] In the United States of America patent application no US20050012413, the stator used in the electric motors comprises a star-shaped stator core at the interior and a laminated yoke at the exterior. The stator windings are placed on the pole teeth of the inner star-shaped core.

[0005] The aim of the present invention is the realization of a stator wherein the stator windings are easily assembled.

[0006] The stator realized in order to attain the aim of the present invention is explicated in the claims.

[0007] The stator of the present invention is composed of two pieces and comprises an exterior laminated stack, formed by laminations aligned one on the top of the other, and an interior laminated stack which is assembled into the exterior laminated stack. The exterior laminated stack is comprised of a cylindrically configured yoke and pole teeth that extend inwardly from the inner periphery to the center in the radial direction and slots are provided between the pole teeth. The interior laminated stack is star shaped and is comprised of a cylindrically configured core and pole teeth that extend outwardly from the outer periphery of the core in the radial direction so as to be inserted between the pole teeth on the exterior laminated stack and channels are provided between the pole teeth.

[0008] In the stator of the present invention, the stator windings are placed in the pole teeth of both the exterior laminated stack and the pole teeth of the interior laminated stack, whereby the pole teeth in the exterior laminated stack are inserted into the channels opposite thereto and the pole teeth in the interior laminated stack are inserted into the opposite slots, traversing all along, the windings placed in the pole teeth extend by passing between one another, radially in opposite directions to one another in the windings section between the yoke and the core and fill in the said section between the yoke and the core such that almost no space is left therein.

[0009] The exterior laminated stack and the interior laminated stack forming the stator are grouped concentrically by the snap-fitting method. The stator comprises more than one recess on the inner surface of the yoke and at the end of the first pole teeth and more than one protrusion on the outer surface of the core at the end of the second pole teeth. As the exterior laminated stack and the interior laminated stack are grouped, the protrusions on the interior laminated stack are seated in the recesses on the exterior laminated stack and a strong connection is obtained.

[0010] In another embodiment of the present invention, the stator is the component of a single phase electric motor which requires a main winding for continuous operation and an auxiliary winding, with a different configuration than the main winding for start-up whereby the first winding at the exterior laminated stack functions as the main winding and the second winding at the interior laminated stack functions as the auxiliary winding.

[0011] In another embodiment of the present invention, the stator is a component of an electric motor with multi-phase characteristics, whereby the first windings at the exterior laminated stack are used for one or more of the said phases and the second windings at the interior laminated stack are used for the remaining phases.

[0012] In an embodiment of the present invention, the first and second windings at the exterior and interior laminated stacks of the stator are wound directly over the pole teeth at the exterior and interior laminated stacks with winding machines.

[0013] In another embodiment of the present invention, the first and second windings at the exterior and interior laminated stacks of the stator are wound previously by special windings apparatus forming coils and these windings kept in the wound position are assembled to the pole teeth.

[0014] In another embodiment of the present invention, the first and second windings at the exterior and interior laminated stacks of the stator are previously wound on coil formers produced of a non-conducting material such as plastic or the like and are assembled to the pole teeth as wound on the coil formers.

[0015] In the stator of the present invention, the windings are oppositely inserted into one another thereby almost entirely filling the cylindrical windings section between the yoke and the core between the exterior and interior laminated stacks thereby minimizing the unwound spaces.

[0016] The stator realized in order to attain the aim of the present invention is illustrated in the attached figures, where:

[0017] Figure 1 - is the schematic view of a stator known in the prior art.

[0018] Figure 2 - is the schematic view of another type of stator known in the prior art.

[0019] Figure 3 - is the schematic view of the stator of the present invention.

[0020] Figure 4 - is the perspective view of an exterior laminated stack of the stator. [0021] Figure 5 - is the schematic view of an interior laminated stack of the stator. [0022] Figure 6 - is the perspective view of an exterior laminated stack of the stator with the placed windings. [0023] Figure 7 - is the perspective view of an interior laminated stack of the stator with the placed windings. [0024] Figure 8 - is the perspective view of the stator composed with the grouping of the exterior and interior laminated stacks in Figure 6 and Figure 7 respectively. [0025] Figure 9 - is the perspective view of an exterior laminated stack of the stator with the assembled coil formers. [0026] Figure 10 - is the perspective view of an interior laminated stack of the stator with the assembled coil formers. [0027] Figure 11 - is the perspective view of the stator composed with the grouping of the exterior and interior laminated stacks in Figure 9 and

Figure 10 respectively. [0028] The elements illustrated in the figures are numbered as follows:

1. Stator

2. Exterior laminated stack

3. Interior laminated stack

4. Yoke

5. , 105. Pole teeth

6. Slot

7. , 107. Winding

8. Core

9. Channel

10. Recess

11. Protrusion

[0029] The stator (1) forming the stationary part in electric motors, comprises an exterior laminated stack (2) formed by laminations aligned one on the top of the other and an interior laminated stack (3) assembled inside the exterior laminated stack (2).

[0030] The stator (1) of the present invention comprises a cylindrically configured yoke (4) forming the main body of the exterior laminated stack (2), more than one first pole teeth (5) arranged at regular intervals along the inner periphery of the yoke (4) and extending inwardly to the center in the radial direction from the inner periphery, more than one slot (6) disposed between the first pole teeth (5) and more than one first winding (7) placed in the first pole teeth (5) (Figures 4 and 6).

[0031] The stator (1) of the present invention furthermore comprises a cylindrically configured core (8) forming the main body of the interior laminated stack (3), more than one second pole teeth (105) forming a star-shape and arranged at regular intervals along the outer periphery of the core (8), extending outwardly in the radial direction so as to pass therebetween the first pole teeth (5), more than one channel (9) situated between the second pole teeth (105) and more than one second winding (107) placed in the second pole teeth (105) (Figures 5 and 7).

[0032] The first and second pole teeth (5, 105) and the first and second windings (7, 107) placed in these pole teeth (5, 105) are disposed inside the windings section (B) between the core (8) and the yoke (4) (Figure 3).

[0033] Each of the first pole teeth (5) passes through the center of the channel (9) opposite thereto and extends up to the outer periphery of the core (8).

[0034] Each of the second pole teeth (105) passes through the center of the slot (9) opposite thereto and extends up to the inner periphery of the yoke (4).

[0035] The first and second windings (7, 107) placed to the first and second pole teeth (5, 105) extend inside the windings section (B) by passing between one another in radially opposite directions to one another.

[0036] The windings (7, 107) that extend inside the windings section (B) of the stator (1) by passing oppositely into one another fill in the windings section (B) such that a minimum space is left therein and thus the windings section (B) is utilized in the maximum amount for emplacing the windings (7, 107). By comparison with the conventional technique, particularly wherein the stator windings are wound only on the exterior laminated stack or only on the interior laminated stack, the volume of the windings section (B) is utilized more efficiently, the possible unused spaces left between the windings (7, 107) are minimized.

[0037] The exterior laminated stack (2) and the interior laminated stack (3) are grouped together concentrically by the snap-fitting method. The stator (1) comprises more than one recess (10) disposed at the inner surface of the yoke (4) and at the apex of the first pole teeth (5) and more than one protrusion (11 ) on the outer surface of the core (8) and at the apex of the second pole teeth (105) and which are seated in the recesses (10) (Figures 4 and 5). While the exterior laminated stack (2) and the interior laminated stack (3) are grouped, the protrusions (11) of the interior laminated stack (3) are seated in the recesses (10) of the exterior laminated stack (2) and thereby a strong connection is obtained.

[0038] In the production of the stator (1) of the present invention, the exterior laminated stack (2) and the interior laminated stack (3) are forged in the lamination mould as different stacks and made ready for placing the windings (J, 107). Afterwards, the first windings (7) are placed in the first pole teeth (5) of the exterior laminated stack (2) and the second windings (107) are placed in the second pole teeth (105) of the interior laminated stack (3) and the exterior laminated stack (2) and the interior laminated stack (3) are grouped by the snap-fitting method while the windings (7, 107) are emplaced on the first and second pole teeth (5, 105) such that the windings (7, 107) pass into one another.

[0039] In another embodiment of the present invention, the stator (1) is a component of a single phase electric motor which requires a main winding for continuous operation and an auxiliary winding, with a different feature than the main winding for start-up, whereby the first winding (7) functions as the main winding and the second winding (107) functions as the auxiliary winding.

[0040] In this embodiment, when for example the start-up moment value of the electric motor, whereof the stator (1) is a component, is desired to be changed, second windings (107) with a different feature are emplaced only at the interior laminated stack (3), without making any modifications at the first windings (7) of the exterior laminated stack (2) that function as the main winding, thereby decreasing the consumption of material and labor costs.

[0041] In another embodiment of the present invention, the stator (1) is a component of an electric motor with multi-phase characteristics, whereby the first windings (7) are used for one or more of the said phases and the second windings (107) are used for the remaining phases.

[0042] In an embodiment of the present invention, the first and second windings (7, 107) are wound directly over the pole teeth (5, 105) at the exterior and interior laminated stacks (2, 3) with winding machines (Figures 6 and 7).

[0043] In another embodiment of the present invention, the first and second windings (7, 107) are wound previously by special windings apparatus to form coils and these windings (7, 107) kept in the wound position are assembled to the first and second pole teeth (5, 105).

[0044] In another embodiment of the present invention, the first and second windings (J, 107) are previously wound on coil formers produced of a non-conductive material such as plastic or the like and are assembled to the first and second pole teeth (5, 105) being in the wound position on the coil formers (Figures 9, 10 and 11).

[0045] In another embodiment of the present invention, the exterior laminated stack (2) and the interior laminated stack (3) constituting the stator (1) are produced in a segmented configuration. The yoke (4) at the exterior laminated stack (2) and the core (8) at the interior laminated stack (3) are produced in half or quarter cylindrical segments formed of laminations aligned one on the top of the other and the segments are attached by inserting, wedging or welding thereby forming the whole cylindrical configurations.

[0046] In the stator (1) of the present invention, the windings (7, 107) are passed oppositely into one another thereby almost entirely filling in the windings section (B) between the exterior laminated stack (2) and the interior laminated stack (3) and the unwound empty spaces are minimized.

[0047] The windings (J, 107) with different properties from one another are wound on the exterior laminated stack (2) and on the interior laminated stack (3) independently from each other, and only the exterior laminated stack (2) or only the interior laminated stack (3) is taken out and the winding (7, 107) thereon are replaced when the start-up moment or the rotation speed parameters of the electric motor, whereof the stator (1) of the present invention is a component, are desired to be changed. [0048] The distances between the consecutive first pole teeth (5) and the consecutive second pole teeth (105) at the exterior and interior laminated stacks (2, 3), that is, the width dimensions of the slots (6) and the channels

(9) can be increased thereby the process of coiling the windings or emplacing the windings is made easier. [0049] The present invention is not limited to the embodiments disclosed above and a skilled person in the art can easily introduce different embodiments.

These should be considered within the scope of the protection disclosed by the claims of the present invention.

Claims

1. A stator (1) comprising an exterior laminated stack (2) formed of laminations aligned one on the top of the other and an interior laminated stack (3) assembled inside the exterior laminated stack (2), a cylindrically configured yoke (4) forming the main body of the exterior laminated stack (2), and characterized by more than one first pole teeth (5) arranged at regular intervals along the inner periphery of the yoke (4) and extending inwardly to the center in the radial direction, more than one slot (6) disposed between the first pole teeth (5), more than one first winding (7) placed in the first pole teeth (5), a cylindrically configured core (8) forming the main body of the interior laminated stack (3), more than one second pole teeth (105) arranged at regular intervals along the outer periphery of the core (8), extending outwardly in the radial direction so as to be inserted therebetween the first pole teeth (5), more than one channel (9) situated between the second pole teeth (105) and more than one second winding (107) placed in the second pole teeth (105).

2. A stator (1) as in Claim 1 , characterized in that each of the first pole teeth (5) passes through the center of the channel (9) opposite thereto and extends up to the outer periphery of the core (8).

3. A stator (1) as in Claim 1 or 2, characterized in that each of the second pole teeth (105) passes through the center of the slot (6) opposite thereto and extends up to the inner periphery of the yoke (4).

4. A stator (1) as in Claim 3, characterized by the first and second windings (7, 107) assembled to the first and second pole teeth (5, 105), extending inside the windings section (B) between the core (8) and the yoke (4) by passing between one another and in radially opposite directions to one another.

5. A stator (1) as in any one of the Claims 1 to 4, characterized by more than one recess (10) disposed at the inner surface of the yoke (4) and at the apex of the first pole teeth (5) and more than one protrusion (11) on the outer surface of the core (8) and at the apex of the second pole teeth (105) and which are seated in the recesses (10).

6. A stator (1) as in any one of the above Claims, which is a component of a single-phase electric motor that requires a main winding for continuous operation and an auxiliary winding, with a different feature than the main winding for start-up and characterized in that the first winding (7) functioning as the main winding and the second winding (107) functioning as the auxiliary winding.

7. A stator (1) as in any one of the Claims 1 to 5, which is a component of a multi-phase electric motor characterized by the first windings (7) being used for one or more of the phases and the second windings (107) being used for the remaining phases.

8. A stator (1) as in any one of the above Claims, characterized by the first and second windings (7, 107) being wound directly over the first and second pole teeth (5, 105) at the exterior and interior laminated stacks (2, 3).

9. A stator (1) as in any one of the Claims 1 to 7, characterized by the first and second windings (7, 107) being wound previously to form coils and assembled to the first and second pole teeth (5, 105).

10. A stator (1) as in any one of the Claims 1 to 7, characterized by the first and second windings (7, 107) being wound previously on coil formers and being assembled to the first and second pole teeth (5, 105) in the wound position on the coil formers.

11. A stator (1) as in any one of the above Claims, characterized by the exterior laminated stack (2) and the interior laminated stack (3) which are produced in the segmented configuration.

12. An electric motor characterized by a stator (1) as in any one of the above Claims.