JPH0347424Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a rotor core for a rotating electric machine, and particularly relates to a rotor core having ventilation holes for ventilation cooling formed in laminated steel plates forming the rotor core. .

B. Summary of the invention This invention proposes that in the rotor core of a rotating electrical machine, the laminated steel plate located in the center of the laminated steel plates forming the rotor core is not provided with an air hole, and the laminated steel plates located on both sides of the laminated steel plate are not provided with air holes. By providing a ventilation hole,
The cooling air that enters the air holes from both ends of the rotor core hits both sides of the laminated steel plates in the center and is smoothly discharged from the duct, increasing the cooling air volume by approximately 20% compared to the conventional rotor core with through-holes. It was possible to do so.

C. Prior Art A rotor in which a rotor core is directly fitted into a shaft has conventionally had the structure shown in FIG. 4. In the figure, 1
2 is a rotor core formed by laminating a large number of silicon steel plates, 2 is a coil housed in a slot, 3 is a plurality of axial cooling grooves (hereinafter referred to as air holes) provided in the rotor core at equal intervals in the circumferential direction, 4 is a duct piece forming a radial cooling groove (hereinafter referred to as duct) 5. The cooling air entering from both ends of the air hole 3 is cooled through ducts 5 provided at appropriate intervals in the rotor core 1.

D Problems to be solved by the invention The disadvantage of the above conventional structure is that the air holes 3 are located at the rotor core 1.
Because it penetrates in the axial direction, both ends 3 of the air hole 3
This means that the air that enters from the duct a collides with each other and loses pressure, and loses the force of blowing outward through the duct 5, resulting in a decrease in air volume and a decline in cooling capacity. The object of the present invention is to provide a rotor core that solves the above-mentioned drawbacks.

E. Means for solving the problem The present invention provides air holes in a rotor core made of laminated steel plates at equal intervals in the circumferential direction and parallel to the axis, and a plurality of ducts communicating with the air holes are formed in the radial direction. The rotating electric machine is characterized in that the air holes are formed in the laminated steel plates located on both sides of the laminated steel plate except for the laminated steel plate located in the center.

F Effect Cooling air entering from both ends of the air hole smoothly passes through the duct and exits in the radial direction without colliding with each other, allowing smooth cooling of the rotor core.

G. Embodiment The present invention will be explained below based on the embodiment shown in FIGS. 1, 2, and 3. It should be noted that the same parts as in the prior art will be described with the same reference numerals. As can be seen from the figure, in the rotor core 1 according to the present invention, no air holes 4 are provided in one stack of laminated steel plates 1a located in the center, and laminated steel plates 1b located on both sides thereof. Air holes 4 are formed only in the area. To construct the rotor core 1 according to the present invention, the laminated steel plate 1a located at the center is fitted onto the shaft 6 with its outer shape press-formed with a mold, and the laminated steel plates 1b located on both sides are fitted with the outer shape. After press-forming, the air hole 4 is pressed out using an air hole punching die, and then the shaft 6 is fitted.

Therefore, according to the above structure, since the central laminated steel plate 11a serves as the wall 7, the cooling air that enters from both ends of the air hole 4 collides with each other forcefully and cancels out, unlike the conventional through-hole air hole 3. The air is blown out smoothly through the duct 5 without any misalignment, and the cooling capacity of the rotor core 1 is improved. When the inventor conducted a prototype test, the amount of air discharged from the intake duct 5 from the air hole 3 was reduced by 20% compared to the conventional one.
I was able to pull it off.

H. Effects of the invention According to the invention, the cooling air that enters each air hole from both ends of the rotor core hits the wall of the laminated steel plate in the center and does not advance any further, so it passes smoothly through the duct that is sent into the air hole. Because it is discharged to the outside,
The air volume has been increased by approximately 20% compared to conventional air holes that penetrate in the axial direction of the rotor core. Due to this improvement in cooling capacity, the output can be increased by approximately 10% compared to a rotating electric machine of the same size and structure. In addition, with conventional axial through-holes, an unbalanced flow of air from both ends may result in axial ventilation in only one direction, which prevents air from being exhausted from the duct to the outside, leading to overheating accidents. However, the present invention could be a fundamental countermeasure against this problem.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the rotor core of a rotating electric machine according to the present invention, Figure 2 is a front view of the laminated steel plates located in the center, Figure 3 is a front view of the laminated steel plates located on both sides, and Figure 4. is an explanatory diagram of a conventional rotor core. 1... Rotor core, 1a... Laminated steel plate located in the center, 1b... Laminated steel plate located on both sides,
3... Wind hole.

Claims (1)

[Scope of utility model registration request] In a rotating electric machine in which air holes are provided in a rotor core made of laminated steel plates at equal intervals in the circumferential direction and parallel to the axis, and a plurality of ducts communicating with the air holes are formed in the radial direction, the air holes are located in the center. A rotor core for a rotating electric machine, characterized in that the core is formed of laminated steel plates located on both sides of the core except for the laminated steel plates located on the laminated steel plate.