JPS61210847A - Ac rotary electric machine - Google Patents

Abstract

PURPOSE:To suppress the transmission of the torus vibration of a stator core to a stator frame, by making an elastic member get out of a core supporting position in the circumferential direction by 90/pole quantity degrees, and by fitting the elastic member on the stator frame. CONSTITUTION:A stator winding is fitted on the inner peripheral face of a cylindrical stator core 1, and inside the winding, a rotor 11 is rotatably arranged. On the outer periphery of the stator core 1, dovetails are vertically and horizontally bonded to plural sections in the axial direction and are extended in the tangential direction, and a spring plate 6 an elastic member having spring effect is arranged in the radial direction. The spring plate 6 is fixed on a stator frame at the position 8 getting out of a core supporting position 6 by 90/pole quantity degrees, namely, by 45 deg. in the circumferential direction. As the result, an AC rotary electric machine suppressing the transmission of the torus vibration of the stator core to the stator frame can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an AC rotating electric machine in which a stator core is supported on a stator frame via an elastic member.

[Technical background of the invention and its problems]

As is well known, the cylindrical stator core of an AC rotating electrical machine undergoes circular vibration with nodes corresponding to the number of poles due to magnetic attraction during operation, and the amplitude of this vibration is particularly large in a two-pole machine. Therefore, in order to suppress vibration transmission to the stator frame,
Means for supporting the stator core on the stator frame via an elastic member is often adopted. Figure 3 is an example of an AC rotating electrical machine with a conventional stator core elastic support structure, and Figure 4 is an example of a
In the sectional view taken along the line IV-IV in the figure, the stator core (2) is supported by a spring plate (2), which is an elastic member, via a rib (2), and is housed in a stator frame (A).

FIG. 5 shows the conventional stator elastic support function as typified by FIG. 3, and the two-dot chain line shows the shape of the stator core (2) when it vibrates. If the radial spring constant of the spring mechanism (3a) is δ, the amplitude of the annular vibrating element of the iron core (1a) is δ, and the radial spring constant of the spring plate attachment part of the stator frame is K, then the stator frame (a) The radial force acting is due to the spring mechanism (3a)
/(k+K
).

However, recent stator frames 6) are generally smaller and lighter in size and weight, so their rigidity is generally lower and the spring constant is also smaller, so the above-mentioned effective ratio of the spring mechanism /(k+K) value becomes high. In other words, there is a tendency that a sufficient vibration transmission suppressing function cannot be obtained.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an AC rotating electrical machine that completely suppresses transmission of stator core vibration to a stator frame and reduces vibration and noise of the stator frame.

[Summary of the invention]

In the present invention, in an AC rotating electrical machine in which a stator core is supported by a plurality of elastic members disposed near the outer circumferential surface of the stator core, the elastic members extend from the core support position in the circumferential direction (90/
By installing it on the stator frame with an offset of (number of poles) degrees,
This completely suppresses the transmission of the annular vibration of the stator core to the stator frame.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a cross-sectional view of a two-pole AC rotating electric machine.

2 is a cylindrical stator core with stator windings (not shown) attached to its inner peripheral surface, and a rotor (11) is rotatably disposed inside the stator core. On the outer periphery of the stator core■,
Spring plates ■, which are elastic members that extend in the tangential direction and have a spring effect in the radial direction, are arranged at multiple locations in the axial direction with dovetail connections on the top and bottom, left and right sides, and this spring plate 0 supports the iron core. It is attached to the stator frame at position 0, which is shifted by (90/number of poles) degrees, that is, 45 degrees, in the circumferential direction from position (2).

Next, the effect will be explained.

FIG. 2 shows the stator core elastic support function of the rotating electrical machine configured as described above. In a two-pole rotating electric machine, the vibration phase of the iron core is reversed at 90 degrees, as shown by the two-dot chain line in FIG.

That is, the core support position (7a) of the first spring plate (6a)
When the second spring plate (6b) is displaced by δ toward the outer diameter, the core support position (7b) of the second spring plate (6b) is displaced toward the inner diameter by δ. These displacements act as spring forces Fa and Fb, respectively, on the spring plate mounting position of the stator frame. What should be noted here is that, as shown in the figure, the spring forces Fa and Fb have the same absolute amount and are 90 degrees apart in direction. Therefore, the stator core vibration does not act on the stator frame as a radial force, but ends up remaining as a moment M = FR that rotates the stator frame, but this moment also mutually cancels out around the entire circumference of the stator frame. Since the force is generated in the direction, as a result, no external force acts. That is, in the rotating electric machine configured as shown in FIG. 1, stator core vibration is completely suppressed without being transmitted to the stator frame.

Although the above example concerns a two-pole machine, the same effect can be achieved in any multi-pole machine by changing the circumferential positional deviation between the core support part of the spring mechanism and the attachment part to the stator frame. Obtainable.

〔Effect of the invention〕

As described above, according to the present invention, since the core support position of the elastic structure that supports the stator core and the mounting position to the stator frame are shifted by (90/number of poles) degrees in the circumferential direction, the stator core Therefore, it is possible to provide an AC rotating electric machine in which transmission of the annular vibration to the stator frame is completely suppressed.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the AC rotating electrical machine of the present invention, FIG. 2 is an explanatory diagram of the stator core elastic support mechanism of FIG. 1,
Figure 3 is a cross-sectional view of the conventional example, and Figure 4 is the TV-T shown in Figure 3.
FIG. 5 is a sectional view taken along line V and is an explanatory diagram of the core elastic support mechanism of FIG. 3. 1... Stator core 4... Stator frame 6...
Spring plate 7, which is an elastic member...core support position

Claims (1)

[Claims] In an AC rotating electric machine in which a stator core is supported by a stator frame via a plurality of elastic members disposed near the outer circumferential surface of the stator core, the elastic members extend in the circumferential direction from the core support position (90/number of poles). An AC rotating electrical machine characterized by being mounted on a stator frame with an offset of one degree.