Stator coil and method for manufacturing the same

Abstract

A simple method ensures high insulation performance in the coil at the coil end. [Solution] After winding the stator coil, radial compression pressure is applied to the coil end portion to cause deformation at the coil contact point. Then, the compression pressure is released to release the coil contact. When the compression pressure is released, the deformed coil contact point retains its deformation and springs back, creating a space between the coils. This space between the coils provides high insulation performance to the coils.

Description

Technical Field

[0001] The present disclosure relates to a stator coil and a method for manufacturing the same, and more particularly to a stator coil of a rotating electrical machine having a stator coil wound around a stator core and a method for manufacturing the same.

Background Art

[0002] Conventionally, as this type of stator coil, a stator coil wound around a stator core is configured by connecting a plurality of segment coils with a plurality of connecting members (see, for example, Patent Document 1). In this stator coil, the manufacturing process is simplified by the above method.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, with the increase in the voltage of motor systems, high insulation performance has been required for the stator coils of rotating electrical machines. In a modular stator, since the coils are open at the coil ends, their insulation performance is particularly required.

[0005] The main object of the stator coil and the manufacturing method thereof according to the present disclosure is to ensure high insulation performance for the coil at the coil ends by a simple method.

Means for Solving the Problems

[0006] The stator coil of the present disclosure has adopted the following means to achieve the above main object.

[0007] The stator coil of the present disclosure is A stator coil for a rotating electric machine having a stator core and a stator coil wound around the stator core, After winding the stator coil, a radial compressive pressure is applied to the coil end to cause deformation at the coil contact point, and then the compressive pressure is released to release the coil contact. It is characterized by the following:

[0008] In the stator coil of this disclosure, radial compressive pressure is applied to the coil end portion after winding the stator coil to cause deformation at the coil contact points. Subsequently, the compressive pressure is released to release the coil contact. When the compressive pressure is released, the deformed coil contact points retain their deformation and spring back, creating a space between the coils. This space between the coils provides high insulation performance to the coils. In this way, high insulation performance can be ensured at the coil end portion of the coil by a simple method of applying and releasing radial compressive pressure at the coil end portion.

[0009] The stator coil of this disclosure may be a stator coil in an assembled stator having a plurality of segment coils and a plurality of connecting members, wherein the plurality of segment coils are connected to the stator core by the plurality of connecting members.

[0010] The method for manufacturing a stator coil according to this disclosure is: A method for manufacturing a stator coil of a rotating electric machine having a stator core and a stator coil wound around the stator core, The first step involves applying radial compression pressure to the coil end portion after winding the stator coil to cause deformation at the coil contact point, After the first step, a second step is taken to release the compression pressure and disengage the coil contact, It is characterized by having the following features.

[0011] In the method for manufacturing a stator coil according to this disclosure, radial compression pressure is applied to the coil end portion after winding the stator coil to cause deformation at the coil contact points. Subsequently, the compression pressure is released to release the coil contact. When the compression pressure is released, the deformed coil contact points retain their deformation and spring back, creating a space between the coils. This space between the coils provides high insulation performance to the coils. Thus, high insulation performance can be ensured at the coil end by a simple method consisting of a first step of applying radial compression pressure to the coil end portion and a second step of releasing the compression pressure after the first step.

[0012] In the method for manufacturing a stator coil according to the present disclosure, the stator coil may have a plurality of segment coils and a plurality of connecting members, and the method may include a step of assembling the stator core by connecting the plurality of segment coils with the plurality of connecting members. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram illustrating how the stator coil 30, as one embodiment of the present disclosure, is assembled to the stator 20. [Figure 2] This is a schematic diagram illustrating a portion of the stator 20 with the stator coil 30 wound around teeth 26 (slot 28). [Figure 3] This is a perspective view of the entire stator 20. [Figure 4] This is a schematic diagram illustrating the changes in the state of the segment coil 32 when compression pressure is applied and when the compression pressure is released. [Modes for carrying out the invention]

[0014] Next, embodiments for implementing this disclosure will be described. Figure 1 is a schematic diagram illustrating how a stator coil 30 is assembled to a stator 20 as one embodiment of this disclosure. The stator 20 has a rotor (not shown) positioned in its center and constitutes a circular electrical system.

[0015] The stator 20 comprises a stator core 22 and a stator coil 30 wound around the stator core 22. The stator core 22 is constructed by laminating multiple electromagnetic steel sheets and consists of a substantially annular core back 24 and a plurality of teeth 26 formed to protrude radially inward from the inner circumferential surface of the core back 24. Slots 28 are formed between each tooth 26, and the stator coil 30 is wound around these slots.

[0016] The stator coil 30 is wound around the teeth 26 (slots 28) of the stator core 22 in a star or delta connection, according to the specifications of the rotating electric machine, and consists of U-phase, V-phase, and W-phase coils. The stator coil 30 is composed of multiple segment coils 32 connected together.

[0017] The segment coil 32 is obtained by cutting the stator coil 30 to a manageable length. In this embodiment, it consists of a U-shaped first segment coil 32a, a V-shaped second segment coil 32b, and a tubular connecting member 34 that connects the first segment coil 32a and the second segment coil 32b. The first segment coil 32a and the second segment coil 32b are made of a wire with a substantially rectangular cross-section covered with a coating of insulating material, and both ends are tapered to be thinner by the thickness of the connecting member 34. The connecting member 34 is made by coating the surface of a tubular member made of conductive material with a coating of insulating material.

[0018] FIG. 2 is an explanatory diagram schematically showing a part of the stator 20 around which the stator coil 30 is wound on the teeth 26 (slots 28). FIG. 3 is a perspective view perspective of the entire stator 20. As shown in the figure, the stator coil 30 is wound so that the space of the slot 28 of the stator core 22 is filled (so that the wire filling factor is increased).

[0019] In an embodiment, with respect to the end coil portion of the stator coil 30 wound around the stator 20 thus configured, as shown by the white arrows in FIGS. 2 and 3, a pressing force (compressive pressure) is applied from the inner peripheral side and the outer peripheral side in the radial direction to abut adjacent coils and cause deformation in their cross-sectional shapes. Then, the compressive pressure applied to the coil end portion is released. FIG. 4 is a schematic explanatory diagram schematically showing the state change of the segment coil 32 when the compressive pressure is applied and when the compressive pressure is released. When a radial compressive pressure is applied to the coil end portion, adjacent segment coils 32 abut, and deformation due to the pressure occurs at the abutting portion (the left side in FIG. 4). When the compressive pressure is released from this state, the abutment of the abutting deformed portion of the segment coil 32 is disengaged due to springback, creating a slight space between the abutting deformed portions. This space imparts high insulation performance to the coil end portion.

[0020] In the stator coil 30 of the embodiment described above, after winding around the teeth 26 (slots 28) of the stator core 22 to form the stator 20, a radial compressive pressure is applied to the coil end portion of the stator coil 30 to abut adjacent segment coils 32 and cause deformation in the abutting portion, and then the compressive pressure is released to disengage the abutment of the abutting deformed portions of the adjacent segment coils 32 and create a slight space between the abutting deformed portions. Since this space imparts high insulation performance to the coil end portion, high insulation performance can be ensured at the coil end portion by a simple method.

[0021] The correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem will be explained. In the embodiment, the stator core 22 corresponds to the "stator core," and the stator coil 30 corresponds to the "stator coil."

[0022] Furthermore, the correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem is merely an example to specifically explain the form in which the embodiment implements the invention described in the section on means for solving the problem, and does not limit the elements of the invention described in the section on means for solving the problem. In other words, the interpretation of the invention described in the section on means for solving the problem should be based on the description in that section, and the embodiment is merely one specific example of the invention described in the section on means for solving the problem.

[0023] Although the present disclosure has been described above using embodiments, the present disclosure is not limited in any way to these embodiments, and can of course be implemented in various forms without departing from the gist of the present disclosure. [Industrial applicability]

[0024] This disclosure is applicable to industries such as the manufacturing of rotating electric machines with stators. [Explanation of Symbols]

[0025] 20 Stator, 22 Stator core, 24 Core back, 26 Teeth, 28 Slots, 30 Stator coil, 32, 32a, 32b Segment coil, 32a First segment coil, 32b Second segment coil, 34 Connecting member.

Claims

1. A stator coil for a rotating electric machine having a stator core and a stator coil wound around the stator core, After winding the stator coil, a radial compressive pressure is applied to the coil end portion to cause deformation at the coil contact point, and then the compressive pressure is released to release the coil contact. A stator coil characterized by the following features.

2. A stator coil according to claim 1, It has multiple segment coils and multiple connecting members, In the case of an assembled stator in which the plurality of segment coils are assembled on the stator core by connecting the plurality of connecting members, Stator coil.

3. A method for manufacturing a stator coil of a rotating electric machine having a stator core and a stator coil wound around the stator core, The first step involves applying radial compressive pressure to the coil end portion after winding the stator coil to cause deformation at the coil contact point, After the first step, a second step is taken to release the compression pressure and disengage the coil contact, A method for manufacturing a stator coil, characterized by having the following features.

4. A method for manufacturing a stator coil according to claim 3, The stator coil has several segment coils and multiple connecting members. The process includes assembling the stator core by connecting the plurality of segment coils with the plurality of connecting members. A method for manufacturing a stator coil.

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