Phase ring support structure and rotating electrical machine

Abstract

The present invention improves, as compared with a conventional insulation construction to ground, a long-term reliability with a phase ring (1) for connecting the armature windings of a rotating electric machine at a stator end portion and a structure in which a metal support structure (2) is disposed on the phase ring outer diameter side and an insulator (3) for ensuring an insulation distance to ground is inserted between the phase ring (1) and the metal support structure (2). The phase ring (1) and the metal support structure (2) are also constructed with an insulation thickness less than or equal to a thickness necessary for insulation to ground by ensuring the insulation distance to ground by the insulator (3), thereby enabling to improve the cooling performance of the phase ring (1) and the metal support structure (2). In addition, the occurrence of induction current occurring in the metal support structure (2) is suppressed, and a simple fastening structure such as, for example, a metal bolt (4) is applicable to a stator frame (5).

Description

Technical Field

[0001] The present application relates to a phase ring support structure and a rotating electrical machine.

Background Art

[0002] As a phase ring support structure, there is known a structure in which a phase ring having a conductor connecting different stator coil ends or between a stator coil end and a rotating electrical machine terminal and a ground insulation layer around the conductor is fixed to a phase ring support with a binding string (see, for example, Patent Document 1). In order to firmly fix the phase ring even if the binding string loosens due to long-term operation, a disc spring is installed between the phase ring and the phase ring support and tightened with a binding string.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the disc spring of Patent Document 1 is made of metal, and discharge may occur between the phase ring and the phase ring support, and there is a risk of breaking the insulation of the phase ring and the phase ring support due to aging deterioration or overvoltage.

[0005] Also, Patent Document 1 discloses a structure in which a disc spring is sandwiched between insulating plates. However, since the disc spring is made of metal, when discharge occurs between the phase ring and the phase ring support, the discharge may bypass the insulating plate and reach the phase ring and the phase ring support, destroying the insulation.

[0006] In addition, it is inevitable that the insulation design of the stator end of the armature winding of a rotating electrical machine with a complex structure due to increased voltage becomes more difficult, or that the vibration design of the phase ring for connecting at the stator end of the armature winding of a rotating electrical machine becomes more difficult due to an increase in electromagnetic vibration force caused by increased current.

[0007] That is, in the vibration design of the phase ring, there is a case where a metal support structure is adopted from the viewpoint of ensuring support rigidity, and insulation is provided between the phase ring and the metal support structure. However, problems such as temperature rise of the phase ring and the metal support structure, inefficient assembly workability of the metal support structure, and low support rigidity at the fixing part of the metal support structure arise.

[0008] In particular, the temperature rise of the phase ring and the metal support structure is caused by the increase in the insulation thickness provided as ground insulation with the increase in voltage, the increase in thermal resistance, and the deterioration of heat dissipation.

[0009] In addition, for the case where the metal support structure is arranged on the inner diameter side of the phase ring, the phase ring physically penetrates through the electrical closed circuit formed by the metal support structure and the stator frame, and it is a structure in which the generation of induced current in the closed circuit cannot be avoided. As a result, a large electrical loss occurs in the metal support structure, which may be more disadvantageous from the viewpoint of temperature rise. In order to suppress this induced current, it is necessary to cut off the closed circuit. For example, an insulating plate is sandwiched between the metal support structure and the stator frame, and components such as an insulating tube, an insulating washer, and a disc spring for insulating creep countermeasures are required around the metal bolt that realizes the fastening function. Therefore, there is a problem that the number of parts during assembly increases and the assembly workability deteriorates.

[0010] In addition, in the case where the metal support structure is arranged on the inner diameter side of the phase ring, since it has to be arranged among densely arranged structures such as the stator coil, the series connection plate, and the phase ring, which are components of the stator end portion of the armature winding, it is difficult to secure a working space when detaching and attaching the metal support structure. In addition, due to the limited space, there are problems such that the shape of the end portion of the metal support structure becomes complicated and it is difficult to secure a predetermined support rigidity due to dimensional constraints.

[0011] The present application has been made to solve the above-described problems, and provides a phase ring support structure for a rotating electric machine with improved cooling performance, shortened working time, and fewer parts.

Means for Solving the Problems

[0012] The phase ring support structure disclosed in the present application supports a phase ring for connecting an armature winding of a rotating electric machine at a stator end portion, and is arranged on the outer diameter side of the phase ring and and includes a support structure made of a metal material and and an insulator arranged between the support structure and the phase ring and formed to secure an insulation distance to ground and and a fixing member that integrally fixes the phase ring, the support structure, and the insulator and and is characterized by including , the support structure has a columnar shape with the axial direction of the phase ring as the longitudinal direction, and both ends in the longitudinal direction are fixed to the stator frame the above.

Advantages of the Invention

[0013] According to the phase ring support structure disclosed in the present application, by inserting an insulator between the phase ring and the support structure, it becomes possible to secure a required insulation distance. As a result, the phase ring and the support structure can be made to be equal to or less than the insulation thickness required for insulation to ground, the cooling performance is improved, and the working time can be shortened and the number of parts can be reduced.

Brief Description of the Drawings

[0014] [[Figure 1]] It is a perspective view of a phase ring support structure according to Embodiment 1. [[Figure 2]] It is a radial cross-sectional view of FIG. 1. [[Figure 3]] It is an axial cross-sectional view of FIG. 1. [[Figure 4]] It is a perspective view of the phase ring support structure according to Embodiment 2. [[Figure 5]] It is a radial cross-sectional view of FIG. 4. [[Figure 6]] It is an axial cross-sectional view of FIG. 4.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, preferred embodiments of the phase ring support structure according to the present application will be described with reference to the drawings. Note that the same reference numerals are assigned to the same content and corresponding parts, and detailed descriptions thereof are omitted.

[0016] Embodiment 1. FIG. 1 is a perspective view of the phase ring support structure according to Embodiment 1, FIG. 2 is a cross-sectional view of the phase ring 1 in the diameter (Y) direction of FIG. 1, and FIG. 3 is a cross-sectional view of the phase ring 1 in the axis (Z) direction of FIG. 1.

[0017] In FIGS. 1 and 2, the phase ring support structure is disposed at the end of the stator winding of the rotating electrical machine and is composed of a phase ring 1, a metal support structure 2, and an insulator 3. The phase ring 1 is for connecting the armature winding of the rotating electrical machine at the stator end. The metal support structure 2 made of a metal material is disposed on the outer diameter side of the phase ring 1. The phase ring 1 is fixed by inserting an insulator 3 between it and the metal support structure 2 and using fixing members such as a binding wire 10. The insulator 3 has a dimension capable of ensuring an insulation distance to the ground.

[0018] In FIG. 3, both ends of the metal support structure 2 disposed on the outer diameter side of the phase ring 1 are fastened and fixed to the stator frame 5 with metal bolts 4. Note that the fixing method is not limited to fastening with metal bolts 4 and may also be welding.

[0019] With such a structure, since the insulator 3 can secure a distance where no discharge occurs, it becomes possible to make the insulation thickness between the phase ring 1 and the metal support structure 2 less than the ground insulation, reducing the number of windings of the insulating taping wound around the phase ring 1 and the metal support structure 2. By reducing the insulation thickness, the cooling performance of the phase ring 1 and the metal support structure 2 is improved. Furthermore, the reduction in the number of taping windings enables a shortening of the working time.

[0020] Also, the structure of inserting the insulator 3 between the phase ring 1 and the metal support structure 2 to secure the required insulation distance between the phase ring and the ground improves the long-term reliability of the insulation compared to the conventional ground insulation construction.

[0021] Also, by arranging the metal support structure 2 on the outer diameter side with respect to the phase ring 1, the phase ring 1 can be passed outside the electrical closed circuit formed by the metal support structure 1 and the stator frame 5. Thereby, the electrical loss in the metal support structure 2 caused by the induced current can be minimized, and it is not necessary to cut off the closed circuit. Along with this, it is not necessary to incorporate a structure having electrical insulation by a plurality of components, and simple fastening with metal bolts or the like having no electrical insulation becomes possible, realizing a shortening of the assembly work time.

[0022] Also, by arranging the metal support structure 2 on the outer diameter side of the phase ring 1, it is possible to secure the assembly work space at the end of the armature winding stator and the space for the structure at the end of the metal support structure 2. Thereby, the assembly workability when detaching the metal support structure 2 is improved, and the complete restraint of the translation and rotation of the end structure of the metal support structure 2 is possible, enabling the exhibition of the flexural rigidity corresponding to a simple simply supported beam at both ends.

[0023] Actual form 2. FIG. 4 is a perspective view showing a phase ring support structure according to the second embodiment, FIG. 5 is a cross-sectional view in the diameter (Y) direction of FIG. 4, and FIG. 6 is a cross-sectional view in the axis (Z) direction of FIG. 4. Since the configuration is the same as that of the first embodiment except for the insulator 6 composed of a plurality of laminated structures, the description thereof is omitted.

[0024] The insulator 6 is inserted between the phase ring 1 and the metal support structure 2 in the same manner as the insulator 3 described in the first embodiment, and is fixed by the binding cord 10. The insulator 6 is configured in a plurality of laminated structures with a size that can ensure the insulation distance between the ground and the ground.

[0025] With such a configuration, in addition to achieving the effects described in the first embodiment, it is possible to easily adjust the gap between the phase ring 1 and the metal support structure 2 during winding, and improve the assembly workability.

[0026] Although various exemplary embodiments and examples are described in the present application, the various features, aspects, and functions described in one or more of the embodiments are not limited to the application of a specific embodiment, but can be applied to the embodiments alone or in various combinations. Therefore, an infinite number of variations not illustrated are envisioned within the scope of the technology disclosed in the present specification. For example, it includes the case where at least one component is deformed, added, or omitted, and further, the case where at least one component is extracted and combined with the components of other embodiments.

Description of Reference Numerals

[0027] 1: Phase ring, 2: Metal support structure, 3, 6: Insulators, 4: Metal bolt, 5: Stator frame, 10: Binding cord.

Claims

1. In a support structure for a phase ring for connecting armature windings of a rotating electrical machine at the stator end, a support structure body made of a metallic material and arranged on the outer diameter side of the phase ring; an insulator arranged between the support structure body and the phase ring and formed so as to secure an insulation distance to the ground; a fixing member for integrally fixing the phase ring, the support structure body, and the insulator; characterized in that the support structure body has a columnar shape with the axial direction of the phase ring as the longitudinal direction, and both ends in the longitudinal direction are fixed to the stator frame. A phase ring support structure.

2. The phase ring support structure according to claim 1, characterized in that the support structure body is fixed to the stator frame by a fastening structure having no electrical insulation property.

3. The phase ring support structure according to claim 1 or 2, characterized in that the insulator has a laminated structure of a plurality of layers.

4. A rotating electrical machine comprising the phase ring support structure according to any one of claims 1 to 3.

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