JPH04101255U - Rotor of fully enclosed rotating electric machine - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the cooling efficiency of the rotor. [Structure] A rotor shaft hollow portion is provided and communicated with air holes provided in the rotor core and core holder, so that outside air passes through the rotor core.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a ventilation cooling structure for a rotor of a totally enclosed rotating electric machine.

0002

[Conventional technology]

FIG. 3 is a vertical cross-sectional view showing an example of a rotor of a conventional fully enclosed rotating electrical machine. , 1 is the rotor shaft, 2 is the rotor core, 3 is the core holder, and 4 is the rotor core 2 and the iron. This is an air hole that passes through the tail presser 3, and the rotor of the rotating electrical machine cannot directly contact the outside air. The rotor is mainly cooled by the gas inside the rotating electrical machine.

0003

[Problem that the idea aims to solve]

However, in such a configuration, the rotor cooling efficiency is not very good, and the capacity In order to increase the In addition, it is necessary to install ducts to cool the gas inside the rotating electric machine. This had the disadvantage of increasing the size of the rotating electric machine, such as the need to increase the size of the heat exchanger. Therefore, this invention aims to improve the cooling efficiency of the rotor in order to eliminate the above-mentioned drawbacks. This is the purpose.

0004

[Means to solve the problem]

As a means to achieve this purpose, the outer part of the rotor shaft is Both shaft ends of the rotor core are hollow, and ventilation passages are provided in the core holders provided on both end faces of the rotor core. This allows the hollow parts at both ends of the rotor shaft and some or all of the air holes in the rotor core to be sealed. This is because outside air is allowed to pass through the air holes in the rotor core.

[0005]

[Effect]

The action is that the rotor iron passes from the hollow part of the shaft end of the rotor shaft through the ventilation part of the core holder. The core is cooled and the temperature rise in the rotor core is kept lower than in conventional fully enclosed rotating electric machines. I can do it. Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

[0006]

【Example】

FIG. 1 is an explanatory diagram showing an embodiment of the rotor of a fully enclosed rotating electric machine according to the present invention, and FIG. FIG. 1 is an explanatory view taken along the line A-A of FIG. Both ends of rotor shaft 1 outside rotor core 2 is a hollow part 5, and the rotor iron is attached to core holders 3 provided on both end faces of the rotor iron core 2. A ventilation passage connecting the hollow part 5 and half of the air holes 4 in the same position as half of the air holes 4 in the core 2. to form one ventilation duct. This ventilation pipe has air flowing from one end of the rotor shaft. By letting out the rotor core 2, the rotor core 2 is cooled by the outside air inside the air hole 4. Gas inside the rotating electrical machine is passed through the air holes 4 in the remaining half of the rotor core 2. Make sure not to obstruct ventilation in the area. Here, the hollow part 5 is provided at both ends, but if it is completely penetrated Also included.

[0007]

[Effect of the idea]

As explained above, according to the present invention, the heat generated in the rotor core 2 passes through the air holes 4. The temperature rise in the rotor core 2 can be suppressed to a low level, and the rotation The child can be made smaller. Furthermore, by lowering the temperature rise of the rotor core, rotation Since the heat radiation from iron core 2 to the inside of the rotating electrical machine is also reduced, the fully enclosed rotating electrical machine with the same capacity If so, it will be smaller and lighter than conventional fully enclosed rotating electric machines. More capacity for the same external dimensions This means that a large rotating electric machine can be constructed. In addition, a part of the air hole 4 contains the inside of the rotating electric machine. By passing this gas, the rotor can be made smaller without impeding ventilation inside the rotating electric machine.

[0008]

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of a rotor of a rotating electric machine according to the present invention.

FIG. 2 is an explanatory diagram in the direction of arrows AA' in FIG. 1;

FIG. 3 is an explanatory diagram showing an example of a conventional rotor.

[0009]

[Explanation of symbols]

1 Rotor shaft 2 Rotor core 3 Iron core holder 4 Wind hole 5 Hollow part 6 Ventilation duct

Claims (1)

[Scope of utility model registration request] Claim 1: In a rotor of a totally enclosed rotating electric machine, in which a rotor core and core holders provided on both end faces of the rotor core are fitted onto the rotor shaft, and air holes are penetrated through the rotor core and the core holders. A rotor of a totally enclosed rotating electric machine, wherein the rotor shaft is configured to pass through a hollow portion in contact with outside air and the air hole.