Rotating electrical machine including coil holder

Abstract

The present disclosure provides a rotating electrical machine including a coil holder, including: a stator; and a salient pole rotor (7) rotatably arranged in the stator, the salient pole rotor (7) comprising: salient poles (9), each salient pole (9) comprising a protruding body (9a) and a rotor coil (11) wound on the protruding body (9a); and coil supports (15) arranged between adjacent salient poles (9) configured to hold the rotor coils (11) of adjacent salient poles (9) in position, where each coil support (15) comprises a structure (15a) configured to enable an air flow in a radial direction of the salient pole rotor (7) and in a longitudinal axial direction of the salient pole rotor (7), where the structure (15a) is a lattice structure.

Description

Technical Field

[0001] The present disclosure generally relates to rotating electric machines having salient pole rotors. Background Art

[0002] A rotating electrical machine with a salient pole rotor has rotor coils wound around rods that protrude from a central axis.

[0003] The coil supports on salient pole rotors prevent the rotor coils from deforming due to centrifugal forces. However, the coil supports also prevent cooling air from freely passing through the rotor coils. This can result in insufficient axial center cooling of the rotor and stator.

[0004] DE1205182 B and US20050212373 A1 disclose examples of coil supports. However, these coil supports are quite heavy and do not provide effective cooling of the rotor coils. Summary of the invention

[0005] Therefore, in view of the above, an object of the present disclosure is to provide a rotating electric machine to solve or at least alleviate the problems of the prior art.

[0006] Therefore, a rotating electric machine is provided, comprising: a stator and a salient pole rotor rotatably arranged in the stator, the salient pole rotor comprising: a salient pole, each salient pole comprising a protrusion and a rotor coil wound on the protrusion, and a coil support arranged between adjacent salient poles and configured to hold the rotor coils of adjacent salient poles in appropriate positions, wherein each coil support comprises a structure configured to enable air flow in the radial direction of the salient pole rotor and in the longitudinal axial direction of the salient pole rotor.

[0007] Through the structure, cooling flow can be provided in both the longitudinal axial direction and the radial direction, so that the rotor coil can be cooled more effectively.

[0008] According to one embodiment, each coil support has an opening arranged to allow an air flow to enter and / or leave the structure in a radial direction and / or a longitudinal axial direction and / or a tangential direction.

[0009] According to one embodiment, the structure is made by additive manufacturing.

[0010] According to one embodiment, the structure is a lattice structure. Due to the transparent lattice structure, the coil support can be made lighter, thereby reducing the load on the coil support bolts with which the coil support is attached to the body of the salient pole rotor.

[0011] According to one embodiment, the structure comprises a plurality of unit cells configured to enable air flow in a radial direction and in a longitudinal axial direction.

[0012] According to one embodiment, the unit cells are configured to enable air flow in a tangential direction of the salient pole rotor. Thus, the cooling air can be directed directly onto the rotor coils.

[0013] The unit cells can be arranged in an ordered or disordered manner.

[0014] According to one embodiment, the unit cells form flow channels in the radial direction, the longitudinal axial direction and the tangential direction of the salient pole rotor, enabling air flow in the radial direction, the longitudinal direction and the tangential direction.

[0015] According to one embodiment, the flow channels in the radial direction, the longitudinal axial direction and the tangential direction are fluidly connected, enabling the air flows in the radial direction, the longitudinal axial direction and the tangential direction to mix and intersect each other.

[0016] According to one embodiment, the structure consists of a non-ferromagnetic material.

[0017] For example, the structure may include a non-ferromagnetic metal such as aluminum, an aluminum alloy, austenitic stainless steel, a titanium alloy, or a polymer material or a polymer composite.

[0018] One embodiment includes at least one fan, wherein each coil support is arranged to receive an air flow from the at least one fan into the structure.

[0019] According to one embodiment, one of the at least one fan is arranged coaxially with the salient pole rotor, and wherein the coil support is arranged to receive an air flow from the fan along the longitudinal axis of the salient pole rotor into the structure of the coil support.

[0020] According to one embodiment, one of the at least one fan is arranged along a radial axis of the salient pole rotor, and wherein the coil support is arranged to receive an air flow from the fan along the radial axis of the salient pole rotor into the structure of the coil support.

[0021] According to one embodiment, at least one of the openings of each coil support faces at least one fan.

[0022] According to one embodiment, each coil support comprises a frame, wherein the structure is arranged in the frame.

[0023] According to one embodiment, the frame consists of a non-ferromagnetic material.

[0024] For example, the frame may comprise a non-ferromagnetic metal, such as aluminum, an aluminum alloy, austenitic stainless steel, a titanium alloy, or a polymer material or a polymer composite material.

[0025] One embodiment includes a plurality of coil support electrical insulations arranged to provide electrical insulation between the coil support and the rotor coils, wherein the coil support electrical insulations have a lattice design.

[0026] The coil support electrical insulation may be integral with the coil support, or they may be separate plates.

[0027] For example, the coil support electrical insulation can be produced by additive manufacturing.

[0028] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise. All references to "a / an / the element, device, component, member", etc. should be openly interpreted as referring to at least one instance of an element, device, component, member, etc., unless explicitly stated otherwise. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Some example embodiments will now be described with reference to the accompanying drawings, in which:

[0030] Figure 1 schematically shows a side view of an example of a rotating electrical machine;

[0031] Figure 2 is a perspective view of an example of a salient pole rotor;

[0032] Figure 3 is a perspective view of an example of a coil support; and

[0033] Figure 4 is a perspective view of another example of a coil holder. DETAILED DESCRIPTION

[0034] The inventive concept will now be described more fully below with reference to the accompanying drawings, in which exemplary embodiments are shown. However, the inventive concept may be embodied in many different forms and should not be construed as limited to the embodiments described herein; rather, these embodiments are provided by way of example so that the present disclosure is comprehensive and complete and fully conveys the scope of the inventive concept to those skilled in the art. Throughout this specification, like numbers refer to like elements.

[0035] Figure 1 An example of a rotating electrical machine 1 is shown. The rotating electrical machine 1 may be a generator or a motor.

[0036] The rotating electrical machine 1 may have a frame 3. Further, the rotating electrical machine 1 includes a stator. Figure 1 According to the example, the stator is arranged inside the frame 3.

[0037] The rotating electrical machine 1 further comprises a rotor. Figure 1 The rotating electrical machine 1 comprises a rotor shaft 5 on which a rotor is mounted.

[0038] The rotor is rotatably arranged in the stator. Therefore, the rotor is configured to rotate relative to the stator inside the stator.

[0039] The rotor is a salient pole rotor 7, Figure 2 An example of the salient pole rotor 7 is shown. The salient pole rotor 7 has a plurality of salient poles 9. The salient poles 9 protrude from the rotor shaft 5 in respective radial directions. Adjacent salient poles 9 are arranged at an angle of less than 180° relative to each other. Typically, the angle is 90° or less.

[0040] The salient poles 9 may be made of laminated metal sheets such as steel.

[0041] The salient pole rotor 7 includes a plurality of rotor coils 11. The rotor coils 11 form parts of respective salient poles 9. Each salient pole 9 is formed by a protrusion 9a and a rotor coil 11 wound around the protrusion 9a. Each rotor coil 11 is wound so that it extends along the side edges of the protrusion 9a, with two side edges along the longitudinal axis A of the salient pole rotor 7.

[0042] The space between two adjacent salient poles 9 is referred to herein as an intermediate channel 13. The salient pole rotor 7 includes the same number of intermediate channels 13 as the number of salient poles 9. In this example, the salient pole rotor 7 has four 9 and four intermediate channels 13. According to some examples, the salient pole rotor may have more than four salient poles.

[0043] The salient pole rotor 7 includes a plurality of coil supports 13. The coil supports 15 are arranged in the space between two adjacent salient poles 9. The coil supports 15 are arranged in the middle channel 13. The coil supports 13 may be wedge-shaped in the cross section of the salient pole rotor 7 so as to fit into the middle channel 13.

[0044] A plurality of coil supports 15 may be arranged in each intermediate passage 13. The coil supports 15 may be arranged in the intermediate passage 13 in sequence.

[0045] The coil support 15 holds the rotor coil 11 in place. The coil support 15 provides pressure on the rotor coil 11, especially when the salient pole rotor 7 rotates.

[0046] The salient pole rotor 7 includes a plurality of fasteners 17 , such as bolts or screws. The coil support 15 is attached to the body of the salient pole rotor 7 by the fasteners 17 .

[0047] The salient pole rotor 7 may include a coil support electrical insulation (not shown) arranged to electrically insulate the rotor coil 11 from the coil support 15. The coil support electrical insulation may be integral with the coil support 15, or they may be in the form of a separate plate arranged between the coil support 15 and the rotor coil 11. Thus, if the coil support electrical insulation forms an integral part of the coil support 15, the coil support 15 is in direct contact with the rotor coil 11. Otherwise, the coil support 15 is in indirect contact with the rotor coil 11 via the coil support electrical insulation arranged as a separate plate.

[0048] Figure 3 An example of a coil support 15 is shown. The coil support 15 comprises a structure 15a. The structure 15a may form most of the volume of the coil support 15. According to one example, as much of the coil support 15 as possible is composed of the structure 15a in view of mechanical strength requirements.

[0049] The structure 15a comprises or consists of a non-ferromagnetic material.

[0050] The structure 15a may preferably be produced by additive manufacturing.

[0051] The structure 15a may be a lattice structure.

[0052] The structure 15a is configured to enable the air flow 15b to pass through the structure 15a in the radial direction of the salient pole rotor 7. The structure 15a is configured to enable the air flow 15b to pass through the structure 15a in the radial direction. In operation of the rotating electrical machine 1, the radial direction of the air flow may be, for example, Figure 3 The radially inward direction and / or the radially outward direction are shown. This generally depends on the configuration of the cooling system of the rotating electrical machine 1 .

[0053] The structure 15a is configured to enable an air flow 15c in the longitudinal axial direction of the salient pole rotor 7. The structure 15a is configured to enable an air flow 15c to pass through the structure 15a in the longitudinal axial direction.

[0054] The structure 15 a may be configured to enable air flow in a tangential direction of the salient pole rotor 7 .

[0055] The structure 15a may include a plurality of unit cells. A unit cell is the smallest building block of the lattice structure 15a, and the smallest building block may be repeated multiple times to form the structure 15a.

[0056] The unit cell may be configured to enable air flow 15b in the radial direction. The unit cell may be configured to enable air flow 15c in the longitudinal axial direction. The unit cell may be configured to enable air flow 15d in the tangential direction. The unit cell may form flow channels in the radial direction, the longitudinal axial direction, and the tangential direction of the salient pole rotor 7, enabling air flow in the radial direction, the longitudinal direction, and the tangential direction.

[0057] According to one example, the flow channels in the radial direction, the longitudinal axial direction and the tangential direction are fluidly connected. This enables the air flows to mix and intersect each other in the radial direction, the longitudinal axial direction and the tangential direction.

[0058] The coil support 15 may include a frame 15e. Alternatively, the coil support 15 may be frameless. In the latter case, the structure 15a may form the entire coil support 15.

[0059] The frame 15e is made of a non-ferromagnetic material.

[0060] The frame 15e has openings arranged to allow air flow to enter or leave the structure 15a in radial and longitudinal axial directions. The frame 15e may also have openings to allow air to leave the structure 15a in a tangential direction.

[0061] Each coil support 15 includes one or more fastener openings 15 f. Each fastener opening 15 f is configured to receive a fastener 17 for attaching the coil support 15 to the body of the salient pole rotor 7.

[0062] The rotating electrical machine 1 comprises at least one fan. The fan or fans form part of a cooling system of the rotating electrical machine 1 .

[0063] According to one example, a fan can be arranged concentrically with the rotor shaft 5. In this case, the fan will blow air along the longitudinal axis A of the salient pole rotor 7. The air blown by the fan enters the lattice structure 15a along the longitudinal axis A and enables the air flow in the longitudinal axial direction of the salient pole rotor 7 within the coil support 15. The structure 15a can then redistribute this air flow through the structure of its unit cells so that the air leaves in a radial direction (e.g., radially outward and / or inward). The structure 15a can redistribute the air flow through the design of its unit cells so that the air leaves in the opposite tangential direction, toward the rotor coil 11. If the coil support 15 has a frame 15e, an opening in the frame 15e faces the fan.

[0064] According to one example, one or more fans may be arranged along the radial axis of the salient pole rotor 7. In this case, one or more fans are fixedly arranged in the stator and are configured to blow air in a radial direction toward the salient pole rotor 7. In this case, the coil support 15 may be arranged to receive an air flow from such a radially blowing fan into the structure 15a. The radial air flow entering the lattice structure 15a may then be redistributed to provide an air flow in a tangential direction and / or a longitudinal axial direction toward the rotor coil 11.

[0065] Figure 4Another example of a coil support 15' is shown. The coil support 15' is generally Figure 3 The coil support 15 shown is very similar.

[0066] The inventive concept has mainly been described above with reference to a few examples. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the inventive concept as defined in the appended claims.

Claims

1. A rotating electrical machine (1), comprising: stator, and A salient pole rotor (7) is rotatably arranged in the stator, and the salient pole rotor (7) comprises: salient poles (9), each salient pole (9) comprising a protrusion (9a) and a rotor coil (11), the rotor coil being wound around the protrusion (9a), and A coil support (15) is arranged between adjacent salient poles (9) and is configured to hold the rotor coil (11) of the adjacent salient poles (9) in an appropriate position, wherein each coil support (15) includes a structure (15a), the structure (15a) being configured to enable air flow in a radial direction of the salient pole rotor (7) and in a longitudinal axial direction of the salient pole rotor (7), wherein the structure (15a) is a lattice structure.

2. A rotating electrical machine (1) according to claim 1, wherein each coil support (15) has an opening arranged to allow air flow to enter and / or leave the structure (15a) along the radial direction and / or the longitudinal axial direction and / or the tangential direction.

3. A rotating electrical machine (1) according to claim 1, wherein the structure (15a) is produced by additive manufacturing.

4. A rotating electrical machine (1) according to any one of the preceding claims, wherein the structure (15a) comprises a plurality of unit cells configured to enable the air flow in the radial direction and in the longitudinal axial direction.

5. The rotating electrical machine (1) according to claim 4, wherein the unit cells are configured to enable air flow in a tangential direction of the salient pole rotor (7).

6. The rotating electrical machine (1) according to claim 5, wherein the unit cells form flow channels in the radial direction, the longitudinal axial direction and the tangential direction of the salient pole rotor (7) so that the air flow can flow in the radial direction, the longitudinal direction and the tangential direction.

7. The rotating electrical machine (1) according to claim 6, wherein the flow channels in the radial direction, the longitudinal axial direction and the tangential direction are fluidly connected, allowing air flows to mix and intersect each other in the radial direction, the longitudinal axial direction and the tangential direction.

8. A rotating electrical machine (1) according to any one of the preceding claims, wherein the lattice structure (15a) consists of a non-ferromagnetic material.

9. A rotating electrical machine (1) according to any one of the preceding claims, comprising at least one fan, wherein each coil support (15) is arranged to receive an air flow from the at least one fan into the lattice structure (15a).

10. A rotating electrical machine (1) according to claim 9, wherein one of the at least one fans is arranged coaxially with the salient pole rotor (7), and wherein the coil support (15) is arranged to receive an air flow from the fan along the longitudinal axis (A) of the salient pole rotor (7) into the lattice structure (15a) of the coil support (15).

11. A rotating electrical machine (1) according to claim 9, wherein one of the at least one fans is arranged along the radial axis of the salient pole rotor (7), and wherein the coil support (15) is arranged to receive an air flow from the fan along the radial axis of the salient pole rotor into the lattice structure (15a) of the coil support (15).

12. A rotating electrical machine (1) according to any one of the preceding claims, wherein each coil support comprises a frame (15e), wherein the lattice structure (15a) is arranged in the frame (15e).

13. A rotating electrical machine (1) according to claim 10, wherein the frame (15e) consists of a non-ferromagnetic material.

14. A rotating electrical machine (1) according to any one of the preceding claims, comprising a plurality of coil support electrical insulations arranged to provide electrical insulation between the coil support (15) and the rotor coil (11), wherein the coil support electrical insulation has a lattice design.

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