JPS60125137A - Stator of rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent a rib from overheating due to the leakage magnetic flux behind a core by providing a sealed conductive bar on the outer periphery of the rib and shortcircuiting the vicinity of the end of a stator core of the bar with a shortcircuiting ring. CONSTITUTION:A stator core 1 is constructed by engaging a thin electric iron plate with a rib 2 having a dovetail key and laminating the plates in a cylindrical shape. This rib 2 is elastically secured by a spring plate 3 to a stator frame. The end of the core 1 is axially secured through a core retainer 4 by clamping the screw at the end of the rib 2 with a nut 5. Further, a sealed conductive bar 8 is secured to the outer periphery of the rib 2. A ring-shaped conductive shortcircuiting ring 9 is provided in the vicinity of the end of the stator core, and a plurality of sealed bars 8 are shortcircuited therebetween. Thus, since the induced current flows through the ring, a local overheat due to the improper contact between the rib 2 and the retainer 4 can be prevented.

Description

[Detailed description of the invention] [Invention Technology Division] The present invention relates to a stator-1 for a rotating electric machine.

[Technical background of the invention and its problems]

As shown in the first factor, the stator core 1 of a large-capacity rotating electric machine, particularly a tubular generator, is constructed by fitting thin fiberglass plates into a lip 2 having a dovetail key and stacking them in a cylindrical shape. The lip 2 is elastically supported by a spring plate 3 on a stator frame (not shown).

As shown in Figure 2, the end of the stator core 1 is fixed in the axial direction by tightening the nut 5 to the screw at the end of the lip 2 via the core holding plate 4. By the way, in such a configuration, when overexcitation occurs during operation as the turbine generator power 1 increases, magnetic saturation occurs in the stator iron core l, causing leakage to the outer diameter 0111 of the stator iron rl:, )l. There will be more magnetic flux. This magnetic flux C2 induces a voltage in the ribs 2, and the iron core holding plate 4F increases the thickness between the ribs. yi
There was a problem with 2 molds, 2 overheating, and 1 fire. In order to solve this problem, we installed electrically conductive members, such as copper shield bars, between 62 ribs arranged on the circumference, and installed shield bars (= deflection of most of the induced current). It is being considered that C21~ (Japanese Unexamined Patent Publication No. 57-78334).

However, in such a structure, the seal
The shielding effect will be on the circumference of the circle (-) and the seal tonneau (-) will increase the number of pieces by 1, (
If you place one seal between the ribs (-1" when all the ribs are arranged), it will take 1 time to assemble only the lip (92 times as much assembly time as the two round threads), which will significantly increase the assembly cost. In addition, since the spacing between the ribs and the shield pars becomes narrower, the working space force 'M' is slightly lowered, and the workability is reduced.Also, conventionally, the contact between the nut and the core holding plate 4 is not improved. In order to do this, a copper-plated washer 6 was used, but due to magnetic vibration during generator operation and expansion or contraction due to heat, the pressure when tightening with the nut 5 decreases, and the nut 5 does not necessarily connect to the nut 5. The contact between the iron core presser foot 4 was not always good.

[Purpose of the invention]

The present invention has been made to address the above-mentioned drawbacks of the prior art, and includes problems such as overheating of the C nipple, which makes mounting work difficult, and overheating between the nut and the core holding plate. The purpose is to provide the stator of electrical machinery in removed times.

[Summary of the invention]

In order to achieve the above object, in the stator of a rotating electric machine of the present invention, a conductive rod-like member is provided entirely along the outer surface of the lip, and the rod-like members are electrically connected to each other by C'' to connect the stator core to the stator core. Provide a short circuit ring surrounding the ring.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows a first embodiment of the present invention, in which a stator core 1
(: Lip 2 with a key to be fitted, Lip 2'?: Spring plate 3 elastically supported on the stator frame 7, and a guiding turtle part shrine fixed to the outer diameter side of the lip, for example, a copper shield par 8. This is a support structure for the stator core consisting of.

By providing a good 2!4 conductivity shield 8 behind the lip 2, the current caused by the stray magnetic flux behind the iron core flows between the low resistance shield 8 and prevents the lip from overheating.

Since the shield par 8 is provided behind the lip 2 and integrated with the lip, the shield par 8 is mechanically protected by the strong lip 2, and there is no fear of breakage.

Further, as shown in FIG. 3, a ring-shaped short-circuit ring 9 with good conductivity is provided near the end of the stator core.1. Shorten the distance between multiple shield pars 8. Since the current induced by f2 flows through the short circuit ring 9, local overheating due to poor contact between C2, lip 2 and core holding plate 4 is prevented. Furthermore, since the shorting ring is attached to the shield par 8 reinforced by the lip 2, the strength of the shorting ring itself is increased. Also,
No. 1 that integrates lip 2 and seal tonneau 5-8
The shield par 8 can be attached without any modification compared to the conventional method of assembling iron core support.

〔Effect of the invention〕

As explained above, the shield is provided on the outer diameter side of the shield with good conductivity, and the vicinity of the stator core end of the shield is short-circuited by the short-circuit ring. It is possible to prevent overheating of the rope due to leakage magnetic flux, and to provide a highly reliable stator for a rotating electric machine.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional stator core support structure;
183 is a sectional view showing an end of a conventional stator core, and FIG. 183 is a sectional view showing a stator according to an embodiment of the present invention. l... Circumferential constant core 2... Lip 3... Spring plate 4... Core holding plate 5... Nut 8... Shield par 9... Short circuit ring. Figure 2. Figure 3

Claims (1)

[Claims] A conductive rod-shaped member is installed along the outer surface of a core support rod attached to the outer periphery of a cylindrical stator core, and a metal circle that electrically connects the rod-shaped members to each other and surrounds the stator core. A stator for a rotating electrical machine characterized by comprising a ring.