JPS62236340A - Stator for rotary electric machine - Google Patents

Abstract

PURPOSE:To accurately detect the temperature of a stator for a rotary electric machine by providing temperature sensors in the vicinity on the inner and outer peripheral surfaces of a cylindrical partition plate mounted on the stator to surround the outer periphery of a rotor at part of the entire axial direction of an air gap between the stator and the rotor. CONSTITUTION:A cylindrical partition plate 14 is so mounted on a stator 3 as to surround the outer periphery of a rotor 7 at part of the axial length of an air gap 15 between a stator core 3 and the rotor 7 laminated through a gap 16. A plurality of temperature sensors 17 are mounted on the inner and outer peripheral surfaces of the plate 14. Cooling gas fed through the sub slot 12 of the rotor 7 flows through a gap of a coil ll as designated by an arrow in a peripheral direction, partly collides with the plate 14, and the residue flows directly to the gap 15. Cooling air flows inner and outer peripheral directions as designated by arrows inside the gap 16 of the core 3. Thus, the sensors 17 accurately separately measure the temperatures of the rotor and the stator.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to ventilation and cooling methods for rotating electric machines, and in particular, to rotors having a rotor in which cooling gas flows only from the inner diameter side of the rotor to the outer diameter side. The present invention relates to a stator of a rotating electrical machine suitable for measuring S degrees of cooling gas in an electrical machine.

[Prior Art] FIG. 2 shows a ventilation diagram of a turbine generator as an example of conventional internal ventilation of a rotating electric machine. A fan 6 attached to the rotor shaft 5 divides the cooling gas into three main directions. That is, one is from the end of the rotor body 7 in the rotor internal axial direction, and the other is the air gap 15 between the stator inner diameter and the rotor outer diameter.
and the other flows to the back of the stator core 2 on the outer diameter side.

The stator core has a section where the cooling gas flows toward the outer diameter and a section where the cooling gas flows toward the inner diameter, and each section is connected to each other by one ventilation pipe 8.

After cooling each part, these ventilation gases gather in the cooler 9, undergo heat exchange, and enter the machine again.

However, in this conventional ventilation method, the gas passes through the stator ventilation duct 16 at sections 7 ◎ and ■ in the same figure, flows toward the inner diameter of the stator core, and is discharged into the air gap, while the gas cools the rotor and is removed. Because the gas that flows to the diameter side and is discharged into the air gap collides within the air gap, even if you measure the gas gA degree at the air gap in this section, the temperature will be higher than that of the ventilation gas from the stator side. It is necessary to measure the temperature of the mixed gas of ventilation gas from the rotor side.

It was not possible to separate the two.

[Problem that the invention seeks to solve]

In the above conventional technology, as shown in Fig. 2, in sections O and (2) of the stator core 2, the stator iron core 2 is cooled by the gas that flows toward the inner diameter and discharged into the air gap, and the rotor tube is cooled to the outer diameter side. The gas flowing into the air gap and the gas discharged into the air gap collide with each other in the air gap.
7, it was not possible to separate the temperature of the exhaust gas from the rotor and the temperature of the exhaust gas that cooled the stator core.

1. The temperature of the stator and rotor, which is a limit in determining the physique of a turbine generator, is not always at the same temperature level, but one of them is set first [8 degrees higher], and the physique of the generator is determined. However, it is important in design to measure the independent temperature distribution of each of the stator and rotor, and in particular, attaching all measurement elements directly to the rotor of one rotor increases reliability and improves the data. There was a problem in taking it out, and it was very difficult.

The purpose of the present invention is to separate the σJ exhaust gas from one rotor and the exhaust gas from the stator side without mixing them, and measure the temperature of each in a section where cooling gas flows from the outer diameter side of the stator to the circular diameter side. The objective is to provide a device that

[Means for solving the problem] In order to achieve the above purpose, the exhaust gas from the stator and the exhaust gas from the rotor side should not interfere with each other within the Fi1 air gap. L cylindrical partition plates are arranged around the outer circumference of the rotor (or the inner circumference of the stator).

A VCC temperature measuring element is provided on the circumferential surface or outer circumferential surface.

[Effect]

Partition plate 14f1. Regarding the exhaust gas from the outer diameter side of the stator core, most of it does not collide with the exhaust gas from the 1st rotor in the air gap, and flows to sections 7 on both sides in the vc@ direction, ensuring smooth ventilation. It acts like this.

Similarly, the cooling gas discharged from the rotor into the air gap flows smoothly vcfL to both sides in the axial direction.

Therefore, since the exhaust gas from the stator side and the exhaust gas from the rotor do not mix in this section, the temperature of each exhaust gas can be measured without mutual influence.

〔Example〕

Embodiment 2 of the present invention will be explained below with reference to FIGS. 1(a) and 1(b).

In section O, the cooling gas passes through the stator ventilation duct 16 and is discharged into the air gap 15.

On the other hand, the cooling gas from the 1st rotor flows axially through the 1st rotor's subslot 2 and the 1st rotor coil 11 cleavage pipe a.
The gas 131 passes through the ventilation hole of the rotor wedge 1o and is discharged radially toward the outer diameter side of the rotor body 7.

These exhaust gases are separated by a partition plate 14 attached to the stator, so they are rarely mixed in one section. By attaching the temperature measuring element 17 to fMilI of the partition plate 14, it is possible to measure the temperature of the exhaust gas from the first rotor. In addition, partition plate 1
If a temperature measuring element is also installed on the outer circumference of the stator, the temperature of the exhaust gas from the stator side can be kept at a constant T.
In this case, it is also possible to omit the element 17 attached to the inner peripheral side of the stator core 2.

Furthermore, it is necessary to select a material for the partition plate that does not block the magnetic flux from the first rotor, and ll1pap is used in this embodiment.

〔Effect of the invention〕

According to the present invention, the cooling gas 6 flows from the outer diameter side of the stator to the inner diameter side.
Since the combined air gas from one rotor and the exhaust gas from the stator side do not mix with each other in the air gap in the Sfi section, the combined air rIA degree of each can be measured.

[Brief explanation of drawings]

FIG. 1(a) is a vertical cross-sectional view of an embodiment of the F1 rotor, and FIG. 1(b) is a cross-sectional view illustrating the ventilation of the F1 rotor. FIG. 2 shows a longitudinal sectional view illustrating the internal ventilation path of the rotating machine. l...Stator frame, 9...Cooler.

Claims (1)

[Scope of Claims] 1. A stator core that is stacked in the axial direction and is stacked at intervals for ventilation at substantially constant stacking thicknesses, and a cooling gas that flows from the inner diameter side of the rotor to the outer diameter side. In a rotating electric machine configured with a rotor that flows only to the side and discharges all of it into the gap between the circular diameter of the stator core and the outer diameter of the rotor, a part of the total axial length of the gap is A temperature measuring element is attached to the inner circumferential surface or outer circumferential surface of a cylindrical partition that surrounds the outer circumference of the rotor and is supported from the stator side in the middle of the radial length of the gap. A stator for a rotating electric machine characterized by: