JPH04150747A - Stator structure for electric rotating machine - Google Patents

Abstract

PURPOSE:To reduce the size and the weight by disposing a cylindrical frame, having outer diameter substantially same as that of a stator core, on a stator core retainer oppositely to the core and to enhance impact resistance by providing a space for disposing a coil support. CONSTITUTION:A stator core 102, a stator core retainer 103 and a yoke board 16 are secured integrally through welding and a stator coil 4 is fitted into a slot 102a made in the inner peripheral part of the stator core 102. Bolt fixing flanges 21a, 22a for split frames 21, 22 to be fitted to the stator core retainer 103 are then fixed by means of fixing bolts 19, where the outer diameter d22 of the split frames 21, 22 is set substantially as large as the outer diameter d1 of the stator core 102 Notches 21b 22b are made at parts of the split frames 21, 22 interfering with the fixing bolts 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application) The present invention relates to a stator structure in a rotating electric machine mainly used as a main motor for a vehicle.

(Prior Art) Conventionally, the stator structure of this type of rotating electrical machine for a vehicle has been used as shown in FIGS. 5 to 8. FIG. 5 is a diagram showing a longitudinal section including the center line of the rotating shaft of the rotating electric machine for a vehicle, FIG. 6 is a cross-sectional view perpendicular to the center line of the rotating shaft, and FIG. 7 is a partial view of FIG. FIG. 8 is a diagram showing a cross section taken along line IX-IX in FIG. 7.

In the figure, reference numeral 1 indicates a stator assembly, and its constituent parts are, as shown in FIG. These are integrated by welding in the stacking direction as shown by X in FIGS. 7 and 8. And stator core 2
The stator coil 4 is configured to be fitted into a slot 2a on the inner circumference so that the end portions of the stator coil 4 extend to both ends of the stator core 2. Reference numeral 5 denotes a frame constituting the outer shell of the rotating electric machine, which has a hollow cylindrical shape integrally having an end plate 5a at one end, and has noses 7a, 7b and a stopper on the outer periphery that are attached to the bogie frame 6. -8 and legs 9 are provided protrudingly. The stator assembly 1 is inserted into the frame 5 from the open end side of the frame 5 at the other end and is fixed with assembly bolts 10. In addition, in order to prevent the stator coil 4 from being damaged by the load caused by the strong impact that occurs when the vehicle passes over the step between the rail joints while the vehicle is running on the rails, the coils are moved from the stator core holder 3 as shown in FIG. Support 12
are arranged in a ring shape and extend in the direction of the rotation axis, and the end portion of the stator coil 4 is securely fixed via the ring-shaped bind ring 13.

Further, a crossover bar 14 for electrically connecting the end portions of the stator coil 4 is disposed on one end side of the end portion of the stator coil 4, and is firmly attached to the stator coil 4 supported by the coil support 12. It is fixedly supported by a fixing string 15.

Reference numeral 11 shown in FIG. 6 is an axle that is rotated by the rotational force of the rotating electric machine via a gear type drive device (not shown).

In the stator structure configured in this way, the outer diameter d+ of the stator assembly 1 (outer diameter of the stator core 2) is determined based on the capacity and characteristics of the rotating electric machine, and this outer diameter d1 is determined at the same time as the outer diameter of the frame 5. This is the inner diameter dimension. Therefore, the outer diameter of the entire rotating electric machine (
The outer diameter d2 of the frame 5 is the sum of the outer diameter d1 of the stator assembly 1 and the wall thickness of the frame 5. The wall thickness of the frame 5 is not restricted from the viewpoint of characteristics, but is determined from the viewpoint of mechanical strength.

By the way, in recent years there has been an increasing demand for smaller and lighter rotating electric machines in order to improve the performance and save energy of vehicles.
The rotating electric machine using the cylindrical frame 5 described above can be downsized and
Weight reduction has reached its limit.

Therefore, recently, a stator structure shown in FIGS. 9 and 10 has been adopted as a means of reducing the size and weight of rotating electric machines. This stator structure includes a stator core presser 10 having fittings Y that can be connected to both ends of the stator core 102.
3, and this stator core presser 103. The joint plates 16 are passed between each other, and these stator cores 102 are
The stator core holder 103 and the connecting plate 1B are fixed together by welding a and b, and in this state, the stator coil 4 is attached by fitting it into the slot 102a on the inner circumference of the stator core 102, and the ring shaped binding ring 13
is attached to fix the stator coil 4, and furthermore, the crossing bar 14 is fixedly supported by a fixing string 15. Further, the noses 107a and 107b, the stopper 108, and the legs 109, which are attachment parts to the truck, protrude from the joint plate 1B to the outer periphery.

In order to configure the stator structure configured in this manner as a frame, split frames 17 and 18 are provided to be fitted into the fitting portion Y of the stator core holder 103, and in order to fix these to each other, mounting bolts are provided. 19 to form a stator assembly 101 having the same function as the stator assembly 1 shown in FIG.

With such a stator structure, the split frame 17.11
The outer diameter d21 of the stator core 102 can be made smaller than the outer diameter d1 of the stator core 102, making it possible to downsize the frame and reduce the weight of the frame. Since the parts other than plate 1B are frameless, weight reduction can also be achieved.

(Problems to be Solved by the Invention) However, the above-mentioned frame-split type rotating electric machine has the following problems. In order to secure the split frames 17 and 18 to the fitting portion Y of the stator core holder 10B with the mounting bolts 19, the bolts are attached to the flanges 17a and 1.
8a, a space e for bolt tightening is required.

In order to secure this bolt tightening space C, the gap f between the stator coil 4 and the inner surface of the split frame 17.18 is reduced, and the coil support 1 that firmly supports the stator coil 4 is
2 (see Figure 5) cannot be installed. Due to this situation, the stator structure shown in Fig. 9 is
Although this is effective in reducing size and weight, its use has been limited to areas where the vehicle is subject to less vibration when running than the stator structure shown in FIG.

In consideration of the above problems, the systems shown in FIGS. 11 and 12 were partially considered. This is because the split frames 171, 1
The outer diameter d22 of the stator core 102 is increased to about 63rd outer diameter of the stator core 102, and the bolt tightening space e is partially provided outside of dl and only at the part (41 locations) of the joint plate IB shown in Fig. 10. A method of configuring the rib 20 by providing the stator core holder 1031 and the split frame 171 was also considered.
Since the number of tightening bolts 19 of , 181 is limited because the rib 20 is attached to only one position, sufficient strength cannot be ensured.

The present invention has been made in view of the above-mentioned problems, and it is possible to reduce the size and weight of a rotating electrical machine, strengthen the support structure of the stator coil, and furthermore, ensure sufficient rotational strength for the attachment of the stator core and frame. The purpose is to provide a stator structure for electrical machinery.

[Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the present invention provides a stator core formed by laminating a plurality of magnetic plates, and a stator core having both end faces in the lamination direction of the stator core. A ring-shaped stator core holder for holding the respective stator core holders, a joint plate that interconnects both stator core holders on their outer periphery sides, and a joint plate provided on the side opposite to the core of each of the stator core holders and connected to the stator core outer periphery. A hollow cylindrical frame having approximately the same outer circumference and connected to the stator core presser and its end face with bolts, and the joint portion of the cylindrical frame using the bolts is provided inside the outer circumference of the cylindrical frame. It is.

(Function) With the above configuration, the cylindrical frame has approximately the same size as the outer periphery of the stator core, and the bolt portion is housed inside the cylindrical frame. The bolt part can secure the necessary space inside the cylindrical frame for its operation, and the outer circumference of the cylindrical frame and the outer circumference of the stator core are almost the same.
The gap f shown in FIG. 9 between the inner surface of the cylindrical frame and the stator coil is secured in a necessary manner. As a result, the stator structure can be made smaller and lighter, and the stator coil support structure and bolt portions can have sufficient strength to withstand vibrations while the vehicle is running.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First, a first embodiment will be explained with reference to FIGS. 1 to 3. Figure 1 is a vertical drawing including the center line of the rotation axis, Figure 2 is a three-dimensional view of the divided frame, and Figure 3 is a z-Z diagram of Figure 2.
It is a detailed view of a cross section. In the figure, 101 indicates a stator assembly, which is a stator core 102 similar to that shown in FIG.
A stator core holder 103 having a connectable fitting portion Y is disposed on both ends of the stator core holder 103.
Pass the connecting plate IB between each other, and connect these stator cores 1.
02, stator core holder 103, and joint plate 16 are welded a,
b (b is the same as that shown in FIG. 1O), and in this state, the stator coil 4 is installed by being fitted into the slot 102a on the inner circumference of the stator core 102.

In order to configure the stator assembly 101 as a frame, the fitting portion Y (third
(Refer to figure) To attach the bolts of the split frame 21.22 to be fitted, attach the flanges 21a and 22a with the bolts 19, and adjust the outer diameter d2□ of the split frame 21.22 to the outer diameter of the stator core 102 at about 61st. It is arranged to make it larger. At this time, notch holes 21b and 22b are provided in the portions of the split frames 21 and 22 that interfere with the bolts 19 for attachment. These notched holes 21b and 22b are for mounting bolts 19.
It is sufficient to have the minimum amount of space necessary to mount the device, as shown in Figure 2. FIG. 2 is a three-dimensional view showing the divided frame 22 shown in FIG. 1, and the divided frame 21 has a cylindrical shape. Further, it is sufficient to secure a space in the direction of the rotating shaft for attaching or removing the mounting bolt 19, and this situation is shown at position 191 in FIG. 3.

If the stator assembly 101 has such split frames 21 and 22, the gap f can be secured in the same way as shown in FIG. It can be attached via 13. Moreover, the outer diameter d22 of the split frame 21.22 is not larger than the stator core d1, and the number of mounting bolts 19 to be installed is not limited, so a configuration in which the required number of bolts can be installed is possible. .

In the above configuration, the inside and outside of the rotating electric machine are open to each other through the small through holes of the notch holes 21b and 22b.
1b, 22b may be closed from the outside to provide a sealed installation type. Furthermore, since the stator assembly 101 is configured to be integrated with the split frames 21 and 22 and will be used as shown in FIG. It will be a good thing. By adopting the first embodiment in this way, the coil support 12 of the stator coil 4 can be arranged in consideration of earthquake resistance.

Further, it is possible to configure the split frame 21.22 without making the outer diameter d22 larger than the outer diameter d1 of the stator core 102.

Moreover, since the number of mounting bolts 19 for fitting and tightening the stator core holder 103 can be arranged without being restricted, the split frames 21 and 22 with sufficient strength can be mounted.

FIG. 4 shows a second embodiment of the present invention, in which the outer diameter d2+ of the split frame 221 is made smaller than the outer diameter d1 of the stator core 102, and a thin plate is formed so as to close the cutout hole 22b. 24, and is suitable when there is sufficient clearance f shown in FIG. Furthermore, in this embodiment, since the outer diameters of the split frames 21 and 22 are reduced, a structure that can reduce weight can be realized.

In addition, the thin plate 23 and the split frame 21°22 shown in FIG.
A packing or sealant may be inserted or filled between the two. Further, the thin plate 23 may be fixed using bolts, welding, or other fittings.

Furthermore, the present invention is not limited to the structure for tightening the mounting bolts shown in FIG. 1, and a structure that combines the structure shown in FIG. 11 with the present invention may be used. In this case, the present invention can be implemented at bolt mounting positions other than the four bolt mounting positions in FIG. 12.

[Effects of the Invention] As is clear from the above description, the present invention provides a cylindrical frame having an outer diameter approximately the same as the outer diameter of the stator core on the side opposite to the core of the stator core holder, and The bolts that connect the child core holder and the cylindrical frame are placed inside the outer periphery of the cylindrical frame to reduce size and weight.Additionally, a space for supporting the coil is provided to improve impact resistance. We can provide stator structures for electrical machines.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a cross section including the center line of the rotating shaft representing the first embodiment of the present invention, FIG. 2 is a three-dimensional view of the divided frame of FIG. 1, and FIG. A Z-section diagram showing the bolt joints between the stator core holder and the split frame;
FIG. 4 is a diagram showing a bolt joint between a stator core presser and a split frame according to a second embodiment of the present invention, and FIG. 5 is a longitudinal cross-sectional view of a conventional example taken along a cross section including the center line of the rotating shaft. 6 is a sectional view taken in a direction perpendicular to the center line of the rotating shaft shown in FIG. 5; FIG. 7 is a partial view of FIG. 5, showing the stator assembly;
Fig. 8 is a cross-sectional view taken along I 11 is a partial view of a longitudinal sectional view taken along a cross section including the center line of the rotating shaft representing another conventional example; FIG. 12 is a rib of the split frame of FIG. 11; 101... Stator assembly, 102... Stator core, 102a... Slot, 103... Stator core presser, 4 ... Stator coil, 12 ... Coil support, 13 ... Bind ring, 14 ... Transition bar 15 ... Fixed string, 16 ... Joint plate, 19
...Mounting bolt, 21.22...Split frame, 21a, 22a...Bolt mounting flange, 21b,
22b...notch hole, 23.24...thin plate. Applicant's representative Patent attorney Takehiko Suzue No. 1 No. L゛1 No. O

Claims (1)

[Scope of Claims] A stator core made of a plurality of laminated magnetic plates, a ring-shaped stator core holder that presses both end faces in the stacking direction of the stator core, and a stator core holder that holds both stator core holders together. joint plates that are interconnected on the outer circumferential side; and joint plates that are provided on the side opposite to the core of each of the stator core holders and have approximately the same outer periphery as the stator core outer periphery, and are joined to the stator core holder by bolts at their end faces. 1. A stator structure for a rotating electric machine, comprising: a hollow cylindrical frame, wherein a joint portion of the cylindrical frame using the bolt is provided inside an outer periphery of the cylindrical frame.