JP2018088791A - Installation structure for exciter stator and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation structure for an exciter stator and a rotary electric machine, which can improve workability in installation of an exciter stator.SOLUTION: A dynamo-electric generator 1 comprises: a frame 2; a bracket 5 that is fixed to an end part of the frame 2 and supports a bearing 4; and an exciter 10 that includes an exciter stator 11 formed in an annular shape. An installation structure for the exciter stator 11 comprises: a projection 27 that is formed on the bracket 5, projects toward an inner side of the frame 2, and has a support part 28 supporting the exciter stator 11; and a fixing member 40 that fixes the exciter stator 11 to the support part 28.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an exciter stator installation structure of an exciter installed in a rotating electrical machine, and to the rotating electrical machine.

  An example of a rotating electrical machine is an AC generator. An alternator has a stator that is arranged in a frame and is fixed to the frame, and a rotor that is arranged in the stator, and a rotating shaft fixed to the rotor is rotated by a prime mover. Thus, an alternating current is generated in the stator.

  In the AC generator, a technique of a brushless generator having an exciter that excites the rotor coil using an iron core having a coil wound around the rotor is known. The exciter includes an exciter stator that is fixed within the frame of the generator and generates a magnetic field by external excitation, and an exciter rotor that is fixed to a rotating shaft. The alternating current generated in the exciter rotor due to the rotation of the exciter rotor is rectified by the rectifier to become a direct current and is supplied to the rotor coil of the generator.

  As a means for installing the exciter stator on the frame, a technique using an annular exciter frame is known (for example, see Patent Document 1). The exciter stator is fixed to an exciter frame arranged in the frame and fixed to the frame. The exciter stator is fixed to the exciter frame by, for example, shrink fitting.

Japanese Utility Model Publication No. 60-2357

  The above-described installation of the exciter stator has the following problems. That is, since the exciter frame is used, the exciter stator installation process requires a step of fixing the exciter stator to the exciter frame and a step of fixing the exciter frame to the frame. In the case where the exciter stator is fixed to the exciter frame by shrink fitting, a process for heating the exciter frame with a furnace is required, and the number of processes is further increased.

  Furthermore, the exciter stator is fixed to the frame via the exciter frame, the exciter rotor is fixed to the rotating shaft, and the bearing supporting the rotating shaft is attached to the frame via the bearing bracket. In many cases, the center of the stator and the center of the exciter rotor do not coincide with each other, and a step of adjusting the gap between the exciter stator and the exciter rotor is necessary. As described above, there is a problem that the number of steps for installing the exciter stator increases. Furthermore, since the exciter frame to which the exciter stator is fixed is inserted into the frame and fixed to the frame, the crane cannot be used when inserting the exciter frame into the frame.

As described above, since the number of steps for installing the exciter stator in the frame is large and a crane cannot be used for this installation work, it takes time to install the exciter stator in the frame. There is a problem.
Therefore, an object of the present invention is to provide an exciter stator installation structure and a rotating electrical machine that can improve the workability of installing the exciter stator in a frame.

  In order to solve the above problems and achieve the object, the exciter stator installation structure of the present invention is configured as follows. As one aspect of the present invention, a rotating electrical machine including a frame having openings at both ends, a bracket that is fixed to an end of the frame and supports a bearing, and an exciter having an exciter stator formed in an annular shape. In the installation structure of the exciter stator, the projecting portion formed on the bracket and projecting toward the inside of the frame, and having a support portion for supporting the exciter stator, and the exciter stator A fixing member that is fixed to the support portion.

  As one aspect of the present invention, a rotating electrical machine includes a frame having openings at both ends, an exciter having an exciter stator disposed in the frame, and a bracket that is fixed to an end of the frame and supports a bearing. A projecting portion formed on the bracket and projecting toward the inside of the frame, and having a support portion that supports the exciter stator, and a fixing member that fixes the exciter stator to the support portion. Prepare.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the installation structure of an exciter stator, and a rotary electric machine with few steps which install an exciter stator in a flame | frame.

Sectional drawing which shows the principal part structure of the generator which concerns on one Embodiment of this invention. The side view which shows the edge part of the generator. Explanatory drawing which shows a lower bracket and exciter stator part of the exciter of the generator. The perspective view which shows a part of same lower bracket and the same exciter stator. Sectional drawing which shows the structure of the modification of the generator.

  Hereinafter, the generator 1 which concerns on the 1st Embodiment of this invention is demonstrated using FIG. 1 thru | or FIG. The generator 1 is an example of a rotating electrical machine. FIG. 1 is a cross-sectional view showing a main configuration of the generator 1. FIG. 2 is an explanatory view showing an end portion of the generator 1. FIG. 3 is an explanatory view showing a state where a part of the lower bracket 20 and the exciter stator 11 is viewed from the frame 2 side. FIG. 4 is a perspective view showing a part of the lower bracket 20 and the exciter stator 11.

  As shown in FIG. 1, the generator 1 includes a frame 2 and a plurality of ribs arranged along the axial direction of the rotary shaft 3 on the circumference of the opening 2 c on the inner surface of the end wall portion 2 b of the frame 2. The stator fixed at 2a, the rotor arranged in the stator, the rotating shaft 3 arranged in the frame 2 and fixed to the rotor, the bearing 4, and the frame 2 fixed to the bearing 4 A bracket 5 that supports the frame 2, a cover 6 fixed to the end of the frame 2, a prime mover connected to the end of the rotary shaft 3, an exciter 10 provided at the end of the frame 2, have.

  The frame 2 has openings at both ends thereof. The frame 2 is composed of a plurality of members, for example. In the present embodiment, the frame 2 includes a pair of annular end wall portions 2b and a plurality of ribs 2a that are provided between the pair of end wall portions 2b and fix the pair of end wall portions 2b to each other. ing. The pair of end wall portions 2b are formed in an annular shape by having an opening 2c inside. The pair of end wall portions 2b are arranged coaxially. The plurality of ribs 2a are arranged side by side in the circumferential direction on the edge of the opening 2c on the inner surface of the pair of end walls 2b, and are fixed to the edge of the opening 2c by fixing means such as welding. For example, five ribs 2a are used. The plurality of ribs 2a extend in the axial direction of the opening 2c. The stator is fixed to the plurality of ribs 2a. The stator has a plurality of coils. The stator is configured such that an alternating current can be generated in a plurality of coils by the magnetic field generated by the rotor and the rotation of the rotor. The rotor is composed of an iron core wound with a coil. The rotor is configured to generate a magnetic field by a direct current supplied from the exciter 10.

  The rotating shaft 3 is rotated by a prime mover. When the rotating shaft 3 rotates, the rotor fixed to the rotating shaft 3 rotates integrally. A part of the rotating shaft 3 is disposed outside the end of the frame 2.

  The bearing 4 is, for example, a slide bearing. The bearing 4 is provided at a part of a portion of the rotating shaft 3 that is disposed outside the end of the frame 2. The bearing 4 is formed in a cylindrical shape, and a part of the rotating shaft 3 is disposed inside thereof.

  As shown in FIGS. 1 and 2, the bracket 5 has a pair of members that sandwich the bearing 4 in the vertical direction. Specifically, the bracket 5 includes a lower bracket 20 in which a lower part of the bearing 4 and a part of the rotary shaft 3 in a state where the generator 1 is installed at the installation location, and the bearing 4. And an upper bracket 30 in which a part of the rotary shaft 3 is disposed inside.

  The lower bracket 20 constitutes a lower part of the bracket 5. The lower bracket 20 includes a bearing housing portion 21 formed in a semi-cylindrical shape, and a flange 22 formed at an end portion of the bearing housing portion 21 and fixed to the end portion of the frame 2.

  The bearing accommodating portion 21 has a lower portion of the bearing 4 disposed therein. The bearing accommodating portion 21 has a lower bearing support portion 23 that supports the bearing 4 by contacting the bearing 4. The lower bearing support portion 23 is a protruding portion formed on the inner surface of the bearing accommodating portion 21. The lower bearing support portion 23 extends, for example, from one circumferential end to the other end of the inner surface of the bearing accommodating portion 21. The front end surface 24 of the lower bearing support portion 23 is formed in an arcuate curved surface with which the outer peripheral surface of the bearing 4 comes into surface contact.

  The flange 22 protrudes radially outward from one end of the bearing accommodating portion 21. The flange 22 is formed in a semi-annular shape, and has a size capable of covering the lower portion of the one end opening of the frame 2. As shown in FIG. 2, the periphery of the flange 22 is fixed to the end surface of the frame 2 by a plurality of fixing members 25 such as bolts. The flange 22 covers a lower portion that is a part of one end opening of the frame 2.

  A projecting portion 27 to which the exciter stator 11 of the exciter 10 is fixed is formed on a surface 26 facing the inside of the frame 2 in the flange 22. As shown in FIG. 3, for example, a plurality of protrusions 27 are formed. The plurality of protrusions 27 are arranged side by side in the circumferential direction of the center line C passing through the center of curvature of the tip surface 24 of the lower bearing support portion 23. The protruding portion 27 protrudes from the surface 26 and is disposed in the frame 2.

  A support portion 28 is formed at the end portion of the protruding portion 27 in the protruding direction and at the end portion of the protruding portion 27 on the center line C side. The support unit 28 supports the exciter stator 11 on the frame 2 by contacting the exciter stator 11. The support portion 28 is formed in a shape in which a part of the surface on the center line C side of the protruding portion 27 is recessed. Specifically, the support portion 28 includes a first surface 28a that is in contact with the surface 11d facing the bracket 5 of the exciter stator 11 and a second surface 28b that is in contact with the outer peripheral surface 11c of the exciter stator 11. And have.

  The first surface 28 a is formed on a plane orthogonal to the center line C. A screw hole 29 into which the fixing member 40 is screwed is formed in the first surface 28a. The fixing member 40 is, for example, a bolt. The 2nd surface 28b is formed in the circular-arc-shaped curved surface centering on the centerline C with which the outer peripheral surface 11c of the exciter stator 11 surface-contacts. The center line passing through the center of curvature of the second surface 28b is the same as the center line C. That is, the second surface 28 b is disposed coaxially with the tip surface 24. In the lower bracket 20, the second surface 28 b and the tip surface 24 are formed by processing with a lathe, for example.

  The upper bracket 30 constitutes an upper part of the bracket 5. The upper bracket 30 is formed in a semi-cylindrical shape. The upper bracket 30 is fixed to the lower bracket 20 by a fixing member such as a bolt. The upper bracket 30 has an upper bearing support portion 31 that supports the bearing 4 by contacting the upper portion of the bearing 4 on the inner surface thereof. The upper bearing support portion 31 is a protruding portion formed on the inner surface of the upper bracket 30. The tip end surface 32 of the upper bearing support portion 31 is formed in an arcuate curved surface that is in contact with the peripheral surface of the bearing 4.

  As shown in FIG. 2, the cover 6 covers a portion of the opening of the frame 2 other than the portion covered with the bracket 5. The cover 6 is formed in a semi-annular shape. The cover 6 is fixed to the upper bracket 30 and the edge of the frame 2 by a fixing member 7 such as a bolt. Thus, the one end opening of the frame 2 is covered with the cover 6 and the bracket 5.

  As shown in FIG. 1, the exciter 10 is disposed in the frame 2, and is disposed in the exciter stator 11, which is disposed in the exciter stator 11. It has a fixed exciter rotor 12 and a rectifier 13 fixed to the rotating shaft 3.

  The exciter stator 11 is supplied with a direct current from the outside. Specifically, the exciter stator 11 includes an exciter stator core 11a formed in an annular shape and a plurality of exciter stator coils 11b provided on the exciter stator core 11a. . The exciter stator 11 forms a magnetic field by a direct current supplied from the outside to a plurality of exciter stator coils 11b.

  The exciter stator 11 is fixed to the support portion 28 of the protruding portion 27 of the lower bracket 20. The outer peripheral surface of the exciter stator 11 has a circular cross section. Specifically, as shown in FIGS. 1, 3, and 4, the exciter stator iron core 11 a has a part of the outer peripheral surface 11 c and a part of the surface 11 d on the bracket 5 side, which are protruding portions 27. In a state of being supported by the supporting portion 28, the fixing portion 40 is fastened and fixed to the supporting portion 28. More specifically, the exciter stator core 11 a is formed with a hole 11 e that communicates with the screw hole 29 formed in the first surface 28 a of the support portion 28. The exciter stator 11 is fixed to the support portion 28 by the fixing member 40 in a state where the outer peripheral surface 11c is in surface contact with the second surface 28b and the surface 11d is in surface contact with the first surface 28a. The In FIG. 4, the fixing member 40 is omitted.

  As shown in FIGS. 1 and 2, the exciter rotor 12 includes an exciter rotor core 12a fixed to the rotary shaft 3, and a plurality of exciter rotor coils 12b provided on the exciter rotor core 12a. And have. The exciter rotor 12 is configured to generate an alternating current in the exciter rotor coil 12b by rotating and by the magnetic field of the exciter stator 11. The exciter rotor 12 has a predetermined gap between the outer peripheral surface 12 c and the inner peripheral surface 11 f of the exciter stator 11.

  The rectifier 13 rectifies the alternating current generated in the exciter rotor coil 12 b of the exciter rotor 12 into a direct current and supplies it to the rotor of the generator 1.

  Next, an example of an installation process of the exciter stator 11 in the frame 2 will be described. First, the exciter stator 11 is fixed to the support portion 28 of the protruding portion 27 of the lower bracket 20. Specifically, as shown in FIG. 3, the exciter stator 11 is placed on the second surface 28 b of the support portion 28, and the surface 11 d of the exciter stator 11 is placed on the first surface of the support portion 28. The surface 11a is brought into contact with the hole 11e of the exciter stator core 11a and the screw hole 29 of the first surface 28a is opposed to each other.

  Next, in this state, the exciter stator 11 is fixed to the support portion 28 by screwing the fixing member 40 into the screw hole 29 through the hole 11e of the exciter stator core 11a. Next, the integrated body of the lower bracket 20 and the exciter stator 11 is fixed to the frame 2 by the fixing member 25. At this time, the lower bracket 20 can be used as a part to be hung on the crane with respect to the integrated body of the exciter stator 11 and the lower bracket 20. For this reason, a crane can be utilized for the process of conveying these integrals, and the process of fixing these integrals to the frame 2.

  In the installation structure of the exciter stator 11 configured as described above, the exciter stator 11 is fixed to the support portion 28 of the protruding portion 27 of the lower bracket 20, so that the lower bracket 20 is fixed to the frame 2. Thus, the exciter stator 11 can be installed in the frame 2 at the same time. For this reason, the number of steps for installing the exciter stator 11 on the frame 2 can be reduced.

  Further, since the protruding portion 27 and the lower bearing support portion 23 are formed on the lower bracket 20, the second surface 28b of the protruding portion 27 and the front end surface 24 of the lower bearing support portion 23 are processed by a lathe. Can be arranged coaxially. For this reason, the process of adjusting the gap between the exciter stator 11 and the exciter rotor 12 becomes unnecessary.

  Thus, according to the generator 1, the number of steps of installing the exciter stator 11 on the frame 2 can be reduced. Moreover, according to the generator 1, the process of adjusting the gap between the exciter stator 11 and the exciter rotor 12 becomes unnecessary. Furthermore, according to the generator 1, a crane can be used for the operation | work which installs the exciter stator 11 in the flame | frame 2. FIG. From these things, the generator 1 can install the exciter stator 11 in the frame 2 with high workability.

  Further, a plurality of protrusions 27 are formed on the flange 22 along the circumferential direction of the exciter stator 11. For this reason, since the exciter stator 11 is stabilized in a state where the exciter stator 11 is placed on the protruding portion 27, the work for fixing the exciter stator 11 to the lower bracket 20 is facilitated. The workability of the assembly work of the machine 1 can be improved.

  Next, a modification of the generator 1 will be described with reference to FIG. As shown in FIG. 5, the generator 1 </ b> A according to the modification includes a support member 50 that supports the exciter stator 11 on the frame 2. The support member 50 is formed so that the upper part of the exciter stator 11 that is not fixed to the lower bracket 20 in the exciter stator 11 can be supported by the frame 2. In the present embodiment, the support member 50 fixes the upper end of the exciter stator 11 to the frame 2.

  For example, the support member 50 has an L-shaped cross section. One end 51 of the support member 50 is fixed to the upper end of the exciter stator 11 by a fixing member 54. The fixing member 54 is, for example, a bolt. The other end 52 of the support member 50 is fixed to the upper end of the frame 2 by a fixing member 54. Specifically, the other end 52 is fixed to a part of the upper end of the end wall 2b by a fixing member 54.

  At the upper end of the exciter stator 11, a fixing portion 53 to which one end portion 51 of the support member 50 is fixed is provided. The fixing portion 53 is formed by, for example, fixing a member different from the exciter stator 11 to the exciter stator core 11a by welding, and has a screw hole into which the fixing member 54 is screwed.

  The support member 50 is fixed to the exciter stator core 11 a by a fixing member 54 before or after the exciter stator 11 is fixed to the lower bracket 20. The support member 50 is configured so that the edge of the frame 2 and the lower bracket are fixed after the integrated body of the exciter stator 11 and the lower bracket 20 is fixed to the frame 2 and before the cover 6 is fixed to the frame 2. 20 is fixed to the end wall 2b of the frame 2 by a fixing member 54 through an opening between the frame 20 and the frame 20. In the generator 1A of such a modification, in addition to the effect of the generator 1, the exciter stator 11 is also fixed to the frame 2, so that the vibration of the exciter stator 11 can be reduced.

  In the present embodiment, the plurality of projecting portions 27 are formed on the surface 26 of the flange 22 of the lower bracket 20, but the present invention is not limited to this. In another example, the protrusion 27 may be formed as one extending in the circumferential direction of the flange 22.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.

  DESCRIPTION OF SYMBOLS 1 ... Generator (rotary electric machine), 2 ... Frame, 3 ... Rotating shaft, 4 ... Bearing, 5 ... Bracket, 10 ... Exciter, 11 ... Exciter stator, 11a ... Exciter stator core, 11b ... Exciter Stator coil, 12 ... exciter rotor, 12a ... exciter rotor core, 12b ... exciter rotor coil, 20 ... lower bracket, 22 ... flange, 27 ... projection, 30 ... upper bracket, 40 ... fixed Member, 50 ... support member.

In order to solve the above problems and achieve the object, the exciter stator installation structure of the present invention is configured as follows. As one aspect of the present invention, a rotating electrical machine including a frame having openings at both ends, a bracket that is fixed to an end of the frame and supports a bearing, and an exciter having an exciter stator formed in an annular shape. In the installation structure of the exciter stator, a projecting portion formed on a lower portion of the bracket and projecting toward the inside of the frame and having a support portion for supporting the exciter stator, and the excitation And a fixing member for fixing the machine stator to the support portion.

As one aspect of the present invention, a rotating electrical machine includes a frame having openings at both ends, an exciter having an exciter stator disposed in the frame, and a bracket that is fixed to an end of the frame and supports a bearing. And a protrusion formed on a lower portion of the bracket and protruding toward the inside of the frame, and having a support portion for supporting the exciter stator, and fixing the exciter stator to the support portion. A fixing member.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.
The invention described in the initial claims of the present application will be appended below.
[1]
The exciter stator of a rotating electrical machine comprising a frame having openings at both ends, a bracket fixed to an end of the frame and supporting a bearing, and an exciter having an exciter stator formed in an annular shape. In the installation structure of
A protrusion formed on the bracket and protruding toward the inside of the frame, and having a support portion for supporting the exciter stator;
A fixing member for fixing the exciter stator to the support;
Exciter stator installation structure comprising
[2]
The bracket includes a bearing accommodating portion that accommodates the bearing and supports the bearing; a lower support member that includes a flange that is fixed to the frame and covers a part of one end opening of the frame; and an upper side of the bearing An upper support member that accommodates the portion,
A plurality of the protrusions are provided on the surface of the flange facing the frame, and are arranged side by side in the circumferential direction of the exciter stator.
The support portion is formed at a tip portion of the protrusion and supports an outer peripheral surface of the exciter stator.
The exciter stator installation structure according to [1].
[3]
A support member for supporting the exciter stator on the frame;
The exciter stator installation structure according to [1].
[4]
A frame having openings at both ends;
An exciter having an exciter stator disposed in the frame;
A bracket fixed to an end of the frame and supporting a bearing;
A protrusion formed on the bracket and protruding toward the inside of the frame, and having a support portion for supporting the exciter stator;
A fixing member for fixing the exciter stator to the support;
A rotating electrical machine.

Claims (4)

The exciter stator of a rotating electrical machine comprising a frame having openings at both ends, a bracket fixed to an end of the frame and supporting a bearing, and an exciter having an exciter stator formed in an annular shape. In the installation structure of
A protrusion formed on the bracket and protruding toward the inside of the frame, and having a support portion for supporting the exciter stator;
A fixing member for fixing the exciter stator to the support;
Exciter stator installation structure comprising The bracket includes a bearing accommodating portion that accommodates the bearing and supports the bearing; a lower support member that includes a flange that is fixed to the frame and covers a part of one end opening of the frame; and an upper side of the bearing An upper support member that accommodates the portion,
A plurality of the protrusions are provided on the surface of the flange facing the frame, and are arranged in the circumferential direction of the exciter stator.
The exciter stator installation structure according to claim 1, wherein the support portion is formed at a tip end portion of the projecting portion and supports an outer peripheral surface of the exciter stator. The exciter stator installation structure according to claim 1, further comprising a support member that supports the exciter stator on the frame. A frame having openings at both ends;
An exciter having an exciter stator disposed in the frame;
A bracket fixed to an end of the frame and supporting a bearing;
A protrusion formed on the bracket and protruding toward the inside of the frame, and having a support portion for supporting the exciter stator;
A fixing member for fixing the exciter stator to the support;
A rotating electrical machine.