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Title:
AN ARRANGEMENT FOR ALTERNATORS OR ELECTRIC MOTORS
Document Type and Number:
WIPO Patent Application WO/2022/115058
Kind Code:
A1
Abstract:
The invention relates to a system (1) that comprises the following so as to convert at least one electrical and mechanical energy into another, a body (10); a stator (20) that is fixedly arranged in the body (10) such that a primary space (B1) is formed between said body (10) and the same; a rotor (30) that is fixedly arranged in the stator (20) and rotatable on its axis, such that a secondary space (B2) is formed between said stator (20) and the same and a shaft (40) that is fixedly connected to said rotor (30); at least one fan that is arranged to generate an air flow in said primary and secondary space (B1, B2); inner fins (111) that extend from the inner surface (11) of the body (10) to the primary space (B1) so as to provide heat transfer from the airflow formed.

Inventors:
DERELİ İZZET (TR)
Application Number:
PCT/TR2020/051195
Publication Date:
June 02, 2022
Filing Date:
November 30, 2020
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DERELI IZZET (TR)
International Classes:
H02K9/18; H02K9/08
Foreign References:
US20120248908A12012-10-04
EP2573906A22013-03-27
US20200153300A12020-05-14
Attorney, Agent or Firm:
BİLEN SINAİ MÜLK. HİZ. DAN. MÜH. İTH. İHR. TİC. LTD. ŞTİ. (TR)
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Claims:
CLAIMS

1. The invention relates to a system (1) that has the following so as to convert at least one electrical and mechanical energy into another, a body (10), a stator (20) that is fixedly arranged in the body (10) such that a primary space (B1) is formed between said body (10) and the same; a rotor (30) that is fixedly arranged in the stator (20) and rotatable on its axis, such that a secondary space (B2) is formed between said stator (20) and the same and a shaft (40) that is fixedly connected to said rotor (30), characterized by comprising; at least one fan that is arranged to generate an air flow in said primary and secondary space (B1 , B2); inner fins (111) that extend from the inner surface (11 ) of the body (10) into the primary space (B1) so as to provide heat transfer from the airflow generated.

2. A system (1 ) according to claim 1 , characterized in that, inner surface (11 ) said body (10) is arranged in cylindrical form.

3. A system (1 ) according to claim 1 or 2, characterized in that, said inner fins (111) extend towards the stator (20) in the radial direction.

4. A system (1) according to any one of the preceding claims, characterized in that, said inner fins (111) are arranged in a manner such that the width from the body (10) towards the stator (20) reduces.

5. A system (1) according to any one of the preceding claims, characterized in that, it comprises a fixing protrusion (13) that extends from the inner surface (11) of the body (10) towards the stator (20) and contacts the same so as to fix said stator (20).

6. A system (1) according to claim 5, characterized in that; said fixing projection (13) extends in the same direction with the inner fins (111).

7. A system (1) according to any one of the preceding claims, characterized in that, said fan is a primary fan (50) that is fixedly connected to the shaft (40).

8. A system (1) according to any one of the preceding claims, characterized in that, it comprises outer fins (121) that are arranged on the outer surface (12) of said body (10).

9. A system (1) according to claim 8, characterized in that; it comprises a secondary fan (60) so as to create an airflow that passes by contacting said outer fins (121).

10. A system (1) according to claim 9, characterized in that; said secondary fan (60) is engaged with the shaft (40).

11. A system (1) according to any one of claim 9 or 10, characterized in that; it comprises a housing (70) that is arranged to direct the airflow provided by said secondary fan (60) to the outer fins (121 ) and to cover at least a part of the body (10).

12. The invention is an alternator comprising a system (1) according to any one of the preceding claims.

13. The invention is an electric motor comprising a system (1) according to any one of the claims 1-11.

Description:
AN ARRANGEMENT FOR ALTERNATORS OR ELECTRIC MOTORS

TECHNICAL FIELD

The invention relates to an arrangement for cooling a system which has stators and rotors arranged in a body and configured to convert at least one of electrical and mechanical energy into the other and a system in which said arrangement is carried out.

PRIOR ART

Heating is experienced in alternators that produce electrical energy from mechanical energy or in electrical motors that produce mechanical energy from electrical energy during operation thereof. Excessive heat may decrease efficiency of products, in some cases, permanently may degauss magnets and damage the insulation of the coils. For these reasons, it is crucial to eliminate the generated heat and to optimize the cooling efficiency.

In general, the part where the electric motors or alternators and stator and rotor are located is completely isolated and cooled by the fins on the outer surface of the body by means of an external fan and in this method, only the stator is cooled by means of conduction from the outer surface and thus the rotor cannot be cooled since there is no contact. The heat source is substantially formed in the copper coils in the stator grooves in the electrical machines. In systems where the system is closed and only the body is cooled from the outer surface, it is required to reach the fins on the outer surface by means of conduction and thus progressing on a very long path until this heat formed on the copper coils is eliminated, thus this reduces the heat transfer efficiency.

In a system described in document with publication number US6639334B2, a solution is proposed so as to obtain a fluid (liquid or gas) contact in a strong manner with a jet system over the copper coils. Herein, while a requirement for an extra device in the system occurs, this device also leads to extra power consumption.

In another system described in the document with publication number US6727609B2, a solution is proposed in terms of channels extending in the rotor towards the coils and a shaft that is provided in hollow form and has channels thereon. Herein, coolant is fed through the shaft and this coolant cools the coils by means of passing through the channels. Herein, since the shaft is hollow and perforated, the shaft is structurally weakened.

In another document with publication number US9413208B2, axial holes on the rotor as well as fins on the shaft is proposed as a more efficient cooling solution. Herein, the fins are arranged so as to provide heat transfer. The blades mentioned here that are arranged on the shaft causes the axial elongation of the structure and leads to a non compact structure since the parts with fin can only be arranged on the right or left side of the rotor. Furthermore, although the axial holes provided on the rotor are useful for cooling, also herein the amount of path does not change until the heat is eliminated and thus the required efficiency cannot be obtained yet.

As a result, all above-mentioned problems have made it necessary to make an improvement in the relevant technical field.

AIM OF THE INVENTION

The present invention aims to eliminate the above-mentioned problems and to make a development in the relevant technical field.

The main aim of the invention is to provide a system structure that can be arranged as an alternator or an electric motor, provided to increase the cooling performance in both the rotor and the stator so as to eliminate the heat generated during the conversion of at least one of the electrical and mechanical energy into the other.

It is aimed to provide a cooling system that can provide more power and durability in the alternator and electric motors compared to its substitutes with an improved cooling efficiency.

BRIEF DESCRIPTION OF THE INVENTION

In order to fulfil all aims mentioned above and that will be achieved from the detailed description herein below, the present invention is a system that comprises the following so as to convert at least one electrical and mechanical energy into another, a body; a stator that is fixedly arranged in the body such that a primary space is formed between said body and the same; a rotor that is fixedly arranged in the stator and rotatable on its axis, such that a secondary space is formed between said stator and the same and a shaft that is fixedly connected to said rotor. Accordingly, the present invention comprises; at least one fan that is arranged to generate an air flow in said primary and secondary space; inner fins that extend from the inner surface of the body into the primary space so as to provide heat transfer from the air flow generated.

Therefore, the heat transfer area is significantly increased by arranging the fins extending inwardly on the body where the main heat transmission is provided, the removal of the air flow in the shortest path of the air flow is possible without using extra devices in any way or disrupting the structure of the system.

In a preferred embodiment of the invention, said body inner surface is arranged cylindrically.

In another preferred embodiment of the invention, said inner fins extend radially towards the stator.

In a preferred embodiment of the invention, said inner fins are arranged in a manner such that their width decreases from the body towards the stator.

Another preferred embodiment of the invention comprises a fixing protrusion that extends from the inner surface of the body towards the stator and contacts the same for fixing said stator.

In a preferred embodiment of the invention, the fixing protrusion extends in the same direction with the inner fins.

In another preferred embodiment of the invention, said fan is a primary fan that is fixedly coupled to the shaft.

A preferred embodiment of the invention comprises outer fins that are arranged on the outer surface of the body.

Another preferred embodiment of the invention comprises a secondary fan so as to create an air flow that passes by contacting said outer fins.

In a preferred embodiment of the invention, said secondary fan is connected to the shaft.

Another preferred embodiment of the invention comprises a housing that is arranged to direct the air flow provided by said secondary fan to the outer fins and to cover at least a part of the body. The present invention is an alternator according to any of the embodiments according to claim 1-11 or will be obtained from the detailed description so as to fulfill all aims mentioned above and will be obtained from the following detailed description.

The present invention is an electric motor according to any of the embodiments according to claim 1-11 or will be obtained from the detailed description so as to fulfill all aims mentioned above and will be obtained from the following detailed description.

BRIEF DESCRIPTION OF DRAWINGS

In Figure 1 , a representative schematic view of the inventive alternator is given.

In Figure 1.A, a representative schematic view of another embodiment of the inventive alternator is given.

In Figure 1.B, a representative schematic view of another embodiment of the inventive alternator is given.

In Figure 2, a representative isometric view of an embodiment of the inventive alternator is given.

In Figure 3, the top view of the embodiment in Figure 2 is given.

In Figure 3. A, an exploded view of the embodiment in Figure 2 is given.

In Figure 3.B, the section view of the embodiment in Figure 3 according to the A axis is given.

In Figure 3.C, the section view of the embodiment in Figure 3 according to the B axis is given.

In Figure 3.D, the body in Figure 3.C is given alone.

In Figure 3.D, isometric view of the body alone in Figure 3.C is given.

The figures are not required to be scaled and the details which are not necessary for understanding the present invention may be neglected. Moreover, the elements that are at least substantially identical or have at least substantially identical functions are shown by the same number. DESCRIPTION OF THE REFERENCES IN FIGURES

1. System

10. Body

11. Inner Surface 111. Inner fin

12. Outer Surface 121. Outer fin

13. Fixing protrusion

14. Cover 20. Stator 30. Rotor 40. Shaft

50. Primary fan 60. Secondary fan 70. Housing 80. Connection element B1. Primary space B2. Secondary space H1. Primary airflow H2. Secondary air flow

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the inventive arrangement for the alternator or electric motors is described by means of examples only for clarifying the subject matter such that no limiting effect is created.

The invention relates to a system (1 ) that has the following so as to convert at least one electrical and mechanical energy into the other; a body (10), a stator (20) that is fixedly arranged in the body (10) such that a primary space (B1 ) is formed between said body (10) and the same; a rotor (30) that is fixedly arranged in the stator (20) and rotatable on its axis, such that a secondary space (B2) is formed between said stator (20) and the same and a shaft (40) that is fixedly connected to said rotor (30), characterized by comprising; at least one fan that is arranged to generate an air flow in said primary and secondary space (B1 , B2); inner fins (111 ) that extend from the inner surface (11 ) of the body (10) into the primary space (B1 ) so as to provide heat transfer from the air flow formed.

The system (1 ) stated here can be arranged as both the alternator and the electric motor, and thus the scope of the invention should be interpreted to cover both of these embodiments. In other words, it is possible to produce electrical energy by the rotation of the shaft (40), or to arrange the shaft (40) to be rotated by the interaction of the rotor and stator.

Referring to Figure 1 or 1.A; the inventive system (1 ) is configured on a body (10). The body (10) may be made of aluminum or it is possible to prefer different materials.

The body (10) is provided in the form of a shell, and preferably its inner surface (11) is arranged cylindrically. Besides, in a preferred embodiment, the outer surface (12) of the body (10) is also arranged in a cylindrical shape and thus a cylindrical shell form is obtained.

A stator (20) is arranged fixedly in the inner section of the body (10) and a rotor (30) is arranged in the inner section of said stator (20) such that it can rotate about its axis. The shaft (40) is fixedly connected to the center of the rotor (30) and can rotate together with the rotor (30). The shaft (40) is preferably supported from both ends thereof.

Here, particularly, there must be primary and secondary spaces (B1 , B2) respectively between the body (10) and the stator (20) and between the stator (20) and the rotor (30) and. Herein, the term” space”' shall not be interpreted as there is no element between said elements. Here, as will be explained later, there are inner fins (111) that extend in the primary space (B1 ).

The system (1) comprises at least one fan, and said fan must be arranged so as to provide a primary air flow (H1 ) that are particularly provided on the primary and secondary spaces (B1 , B2). Said fan is preferably a primary fan (50) that is fixedly connected to the shaft (40) and can rotate together with the shaft (40). There are inner fins (111 ) in the invention that are provided on the inner surface (11 ) of the body (10) such that they contact with said primary air flow (H1 ). Herein, both the cooling efficiency is increased and the cooling efficiency particularly in the rotor (30) is significantly increased, since the primary air stream (H1 ) passes through the rotor (30) as well as the stator (20) by means of increasing the heat transfer surface with the inner fins (111) on the inner surface (11 ) of the body (10) that contacts with the primary air flow (H1 ) having a relatively shorter path.

Furthermore, the invention also comprises outer fins (121 ) that are provided on the outer surface (12) of the body (10). Said outer fins (121 ) are arranged so as to increase the heat transfer surface on the outer surface (12).

The inventive system (1) may comprise a secondary fan (60) so as to form a secondary air flow (H2) that will pass over the outer fins (121 ). Said fan is preferably a secondary fan (60) that is fixedly connected to the shaft (40) and can rotate together with the shaft (40).

Said secondary fan (60) can be arranged on mutual sides with respect to each other with respect to the rotor (30) in Figure 1 , as well as on the same side as in Figure 1 .A.

Said secondary fan (60) is preferably provided to be larger than the first fan (50) and therefore the air flow on the outer surface (12) has become more efficient.

The system (1 ) comprises a housing (70) for directing said air so as to cause the air supplied by the secondary fan (60) to create a secondary air flow (H2) to contact the outer blades (121 ).

Said housing (70) can be arranged so as to allow the shaft (40) to exit and otherwise, it can be arranged as a fully closed structure such that it completely surrounds the body (10). Hereby, the air flow can be provided more efficiently but the size of the system increases.

Furthermore, as in Figure 1.B, the housing (70) can be arranged so as to cover only a part of the body. Herein, the casing (70) is arranged particularly on the side of the body

(10) and to surround the secondary fan (60) Herein, most of the air flow provided by the secondary fan (60) contacts with the outer fins (12), but a healthy circulation cannot be obtained since the remaining section is open. For this reason, the requirement of the technical benefit provided by the inner fins (111) is greater in this partially closed system. With reference to Figure 2 and 3; said body (10) is arranged in a cylindrical form and outer fins (121 ) are flattened from its outer surface (12). A housing (70) is positioned so as to form a partially closed system at the base of the cylindrical structure, and the shaft (40) exit is provided from the ceiling section. In addition to this, connection elements (80) extending from the body are arranged so as to allow said system (1 ) to be easily connected to various surfaces.

Preferably, the connecting elements (80) comprise a plate and arms that connect the plate to the body (10). The connection elements (80) can be arranged according to the surface where connection is required.

Referring to Figures 3. A and 3.B; covers (14) are connected to the two open ends of the body (10). Said covers (14) are arranged in compliance with the passage of the shaft (40). Wherein, the primary fan (50) is provided between the cover (14) and the rotor (30), the secondary fan (60) is provided between the cover (14) and the housing (70), and both fans are engaged with the shaft (40). These covers (14) may also be arranged to have bearings to support the shaft (40).

Referring to Figure 3.C-3.E ; said outer fins (121 ) do not extend in the same direction with each other. It is preferably arranged to extend in a vertical and horizontal plane.

In addition to this, the inner fins (111 ) are preferably arranged to extend in the same direction. Particularly it extends towards the stator (20) in the radial direction in a body (10) with a cylindrical inner surface (11 ). Said inner fins (111) preferably extend from the body (10) to the stator (20) such that their widths decrease in particular so as to form a triangular cross section.

Furthermore, fixing protrusions (13) are provided from the inner surface (11 ) of the body (10). Said fixing protrusions (13) have a thicker structure compared to the inner fins (111 ). The stator (20) is provided to remain fixed by pressing the outer surfaces directly on the stator (20). Said end surface can preferably be provided in a curved geometry in compliance with the outer surface of the stator (20). Flerein, although the fixing protrusions (13) also contribute to the cooling process by providing heat transfer partially between the stator (20) and the body (10) but not as much as the inner fins (111 ) do.

Although there are four fixing protrusions (13) shown in Figure 3.C and 3.D, such that two of which will apply lateral and two of which will apply vertical pressure, this number can be provided to be less or more as required. Preferably, equal distance is required to be provided between the fixing protrusions. For example, if four fixing protrusions (13) are provided at 90° intervals in the figures, 120° intervals shall be provided when three fixing protrusions (13) are used.

The protection scope of the invention is specified in the appended claims and cannot be limited to the description made for illustrative purposes in this detailed description. Likewise, it is clear that a person skilled in the art can present similar embodiments in the light of the above descriptions without departing from the main theme of the invention.