JP2002010590A - Stator for rotary electric machine and rotary electric machine using the stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for high precision rotary electric machine which can be manufactured easily. SOLUTION: The inner radial surface of end plates 3 arranged on both sides of a laminated stator iron core 2 is machined and thereby this surface can be formed as the reference surface to execute machining for a stator frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a rotating electric machine,
In particular, the present invention relates to a structure and a manufacturing technique of a stator of a rotating electric machine.

[0002]

2. Description of the Related Art A stator of a rotating electric machine is generally manufactured as follows.

[0003] As shown in FIGS. 8 and 9, a stator frame 1 constituting a stator 10 includes a stator core 2 on which electromagnetic steel sheets are laminated.
An end plate 3 in which thin steel plates are laminated is arranged on both sides of the stator frame 1, and furthermore, the stator frame side plate 1b is pressed from both sides thereof, and the stator frame member 1a passing the center is welded to form the stator frame 1. .
The stator frame 1 performs stress relief annealing after the welding of each member is completed, and further performs machining of each part.

[0004] The machining of each part of the stator frame 1 is performed by placing the stator frame 1 after the stress relief annealing on a machining table 30 via a support member 31 and three points of the inner diameter of the stator core 2, ie, direct connection. The center position, which is an imaginary line, is determined with reference to the side, the center, and the opposite side, and fixed to the machining table 30 with the fixing member 32. Machine processing of the bracket fitting part 15 and other parts are performed based on the center position to complete the stator frame 1.

After the stator frame 1 is completed, a varnish process is performed by incorporating a stator winding (not shown). Heat drying is performed after the varnish treatment, and the bracket fitting portion 15 deformed due to the heat history is machined again to complete the stator 10.

[0006]

However, the machining of the bracket fitting portion 15 performed after the stress relief annealing and the heating and drying is performed with reference to the three inner diameters of the stator core 2. Are laminated with thin plates, and there are minute irregularities on the inner diameter of the stator core 2.
Since after receiving the thermal history, deformation due to thermal stress and plate fall have occurred, and as a reference plane, it is unstable with precision.
Therefore, it takes time to determine the center position on the basis of the three inner diameters of the stator core 2, and the setup time for machining is increased, making the stator 10 difficult to manufacture. There is a problem that there is no.

[0007] Further, since it is unstable as a reference surface for performing machining, there is also a problem that machining accuracy is not good when machining each portion of the stator frame 1.

An object of the present invention is to provide a stator for a rotating electric machine which is easy to manufacture and has high accuracy, and a rotating electric machine using the same.

[0009]

In order to achieve the above object, a feature of a stator for a rotating electric machine according to the present invention is that an inner diameter surface of an end plate arranged on both sides of a laminated stator core is formed. , And to serve as a reference plane when machining the stator frame.

More specifically, the present invention provides the following stator and rotating electric machine.

[0011] The present invention provides a laminated stator core, end plates arranged on both sides of the stator core, a stator frame sandwiching both end plates including the stator core, and In a stator for a rotating electric machine having a stator winding incorporated therein, the inner diameter surfaces of the both end plates are machined and configured to be a reference surface when machining is performed on the stator frame. The present invention provides a stator for a rotating electric machine, characterized in that:

Further, the present invention provides a stator, a rotor rotatably opposed to the inner diameter surface of the stator with a predetermined gap, a bearing device for holding a rotor shaft of the rotor, In a rotating electric machine having the stator and a bracket supporting the bearing device, the stator is the stator for the rotating electric machine according to claim 1.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stator for a rotating electrical machine according to an embodiment of the present invention and a rotating electrical machine using the same will be described below with reference to the drawings.

FIG. 7 is a longitudinal sectional view of an induction motor incorporating a stator for a rotating electrical machine (hereinafter, abbreviated as a stator) according to an embodiment of the present invention. In the present embodiment, the stator frame 1 of the stator 10 is used as an induction motor for a railway vehicle.
And an induction motor having the brackets 4 and 5 as support members as separate members, that is, an induction motor having a divided frame structure will be described as an example.

The induction motor is roughly divided into a stator 10
, A rotor 20, bearing devices 8 and 9 for rotatably holding the rotor 20, and various brackets for supporting the stator frame 1 of the stator 10 and the bearing devices 8 and 9.

The stator 10 includes a cylindrical fixed frame 1, a stator core 2, an end plate 3, and a stator winding 6. Inside the stator frame 1, a cylindrical fixed frame is provided. An iron core 2 and end plates 3 are laminated on both sides thereof. A plurality of slots continuous in the axial direction are arranged in the stator core 2 and the end plate 3 at predetermined intervals in the circumferential direction, and the stator windings 6 are accommodated in the slots.

The rotor 20 includes a rotor core 13, a rotor shaft 12 in which the rotor core 13 is fitted, and a rotor winding 14.
It is composed of The rotor core 13 is provided with a plurality of slots continuous in the axial direction at predetermined intervals in the circumferential direction, and accommodates a rotor winding 14 in the slot. System.

The rotor core 13 fitted on the rotor shaft 12 is provided on the inner peripheral side of the stator core 2 and concentrically with the stator core 2 via a gap.

Both ends of the rotor shaft 12 are held by bearings 8 and 9, respectively.
Are supported by end brackets 16 and cartridge 11, respectively, and end brackets 16 and cartridge 11 are fixed to brackets 4, 5, respectively.

At the side end of the bracket 5, a speed sensor 7 for measuring a rotation speed and a rotation direction is mounted.

Next, the structure and manufacturing method of the stator 10 will be described.

FIG. 1 is a sectional view of a stator 10 according to an embodiment of the present invention. However, the stator winding 6 is not shown.

The stator frame 1 constituting the stator 10 has a stator core 2 on which electromagnetic steel sheets are stacked, and end plates 3 on which thin steel sheets are stacked on both sides, and a stator frame side plate 1b is further formed from both sides. Pressure is applied so as to sandwich both end plates 3, and thereafter, a stator frame member 1 a that bridges between both stator frame side plates 1 b is formed by welding. The stator frame 1 including the stator core 2 and the end plate 3 is subjected to stress relief annealing after the welding of each member.

Next, as shown in FIG. 2, the inner surface processed surface 3a of the both end plates 3 subjected to the stress relief annealing is subjected to machining, for example, finishing. FIG. 3 and FIG. 4 are views of the inner surface processing surface 3a of the end plate 3 as viewed from above.

Further, each part of the stator frame 1 is machined with reference to the finished inner surface 3a of the both end plates 3.

As shown in FIGS. 5 and 6, the machine processing of each part of the stator frame 1 is performed by mounting the stator frame 1 on which the inner surface processing surface 3a of the both end plates 3 is finished and the four support members 31. The center position of the stator frame 1 serving as an imaginary line is determined with reference to the inner diameter processing surfaces 3a of the finished end plates 3 via the machined table 30, and four pieces are placed on the machined table 30. Is fixed by the fixing member 32. Machine processing of the bracket fitting portion 15 and other parts are performed based on the center position, and the stator frame 1 is completed.

After the stator frame 1 is completed, a varnish process is performed by incorporating the stator windings 6 (not shown). Heat drying is performed after the varnish treatment, and the bracket fitting portion 15 deformed due to the heat history is again subjected to the inner surface 3a of the end plate 3.
And the stator 10 is completed.

As described above, when the stator frame 1 is machined after the stress relief annealing, the inner surface processed surface 3a of the both end plates 3 serving as the reference surface is finish-processed to stabilize the surface. Therefore,
In the final machining of the bracket fitting portion 15 performed after the heating and drying, it is easy to determine the center position based on the two inner diameters of the inner surface 3a of the both end plates 3, and as a result, The setup time required to determine the reference center position can be reduced.

Further, the machining of the bracket fitting portion 15 can be performed with high accuracy by referring to the finished inner surface 3a of the end plate 3 so that the machined stator frame 1 can be machined. Is incorporated in the induction motor, it is possible to secure a gap between the inner diameter surface of the stator core 2 and the outer diameter surface of the rotor core 13 with high accuracy.

Further, by using the inner surface 3a of the finished end plate 3 as a reference, the bracket fitting portion 15 to be installed after the stator winding 6 is assembled and after the varnish process is performed.
Final machining is also easier.

[0031]

According to the present invention, when machining each part of the stator frame after stress relieving annealing, the machined inner surface of the both end plates subjected to stress relieving annealing is machined. By using the two inner diameters as reference planes, it becomes easy to determine the center position as a reference for machining each part of the stator frame, and as a result, the setup work until the center position is determined The time is reduced, and the production efficiency of the stator frame and, consequently, the stator for the rotating electric machine can be improved.

Further, by using the inner diameter surfaces of the finished both end plates as a reference for machining of each portion of the stator frame, it is possible to accurately machine each portion of the stator frame. . As a result, a gap between the inner diameter surface of the stator core and the outer diameter surface of the rotor core can be ensured with high accuracy, and a highly accurate and highly reliable stator for a rotating electric machine and a rotation using the same. An electric machine can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a stator for a rotating electrical machine according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion P in FIG.

FIG. 3 is a top view of the rotating electric machine stator of FIG. 1;

FIG. 4 is an enlarged view of a portion S in FIG. 3;

FIG. 5 is a side view of the stator for the rotating electric machine in FIG. 1 in a stator frame machining setup state;

FIG. 6 is a top view of the stator frame machining setup state of FIG. 5;

FIG. 7 is a longitudinal sectional view of an induction motor incorporating the rotating electric machine stator of FIG. 1;

FIG. 8 is a side view of a stator frame machining setup state of a conventional rotary electric machine.

FIG. 9 is a top view of the stator frame machining setup state of FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stator frame, 1a ... Stator frame member, 1b ... Stator frame side plate, 2 ... Stator core, 3 ... End plate, 3a ... Inner diameter processing surface, 4
... bracket, 5 ... bracket, 6 ... stator winding, 7 ...
Speed sensor, 8: bearing device, 9: bearing device, 10: stator, 11: cartridge, 12: rotor shaft, 13: rotor core, 14: rotor winding, 15: bracket fitting portion , 16 ... end bracket, 20 ... rotor

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Hirofumi Ihara 3-1-1, Sakaimachi, Hitachi-shi, Ibaraki F-term in Hitachi Works, Hitachi Ltd. (reference) 5H002 AA07 AB05 AB06 AC02 AC06 5H605 AA08 CC02 CC03 CC10 EA06 EA15 FF01 GG02 GG14 GG20 5H615 AA01 BB14 PP01 PP06 PP28 SS05 SS08 SS16 SS25 SS55

Claims (2)

[Claims] 1. A laminated stator core, end plates disposed on both sides of the stator core, a stator frame sandwiching both end plates including the stator core, and a stator frame incorporated in the stator core. In the stator for a rotating electrical machine having a stator winding, the inner diameter surfaces of the both end plates are machined, and are configured to be a reference surface when performing machining on the stator frame. A stator for a rotating electrical machine. 2. A stator, a rotor rotatably facing the inner diameter surface of the stator with a predetermined gap, a bearing device for holding a rotor shaft of the rotor, the stator, A rotating electric machine having a bracket for supporting the bearing device, wherein the stator is the stator for the rotating electric machine according to claim 1.