JPH0648355U - Rotating machine rotor - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the cooling efficiency of the rotor of a rotating electrical machine. [Structure] Ventilation hole 4 tilted with respect to rotor shaft 1 with different distances L and M from the rotor shaft center of openings 4a and 4b at both ends of air hole 4 provided in rotor core 2 Is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotor of a rotary electric machine related to a ventilation cooling structure.

[0002]

[Prior art]

 FIG. 2 shows an example of a rotor of a conventional rotating electric machine. 1 is a rotor shaft, 2 is a rotor iron core, 3 is an iron core retainer, 4 is an air hole penetrating the iron core retainer 3 and the rotor iron core 2. is there. Here, an example in which a plurality of air holes 4 are provided in parallel to the rotor shaft 1 in the circumferential direction is shown. The rotor is cooled by the cooling air inside the rotating electric machine passing through the air holes 4.

[0003]

[Problems to be solved by the device]

 However, when such a structure is applied to a high-speed rotating electric machine, the ventilation effect is not sufficiently obtained, and the cooling efficiency in the rotor core is reduced, which may lead to an increase in the temperature of the rotor. The present invention is intended to improve the cooling efficiency of a rotor.

[0004]

[Means for Solving the Problems]

 As means for achieving such an object, a rotor core and a core presser are fitted to both end faces of the rotor core on the rotor shaft, and a plurality of air holes are circumferentially passed through the rotor core and the core presser. In a rotor of a rotary electric machine in which the rotor shaft is provided, the distance from the center of the rotor shaft of one opening of the air hole and the distance from the center of the rotor shaft of the other opening are different from each other. A plurality of air holes inclined with respect to each other are provided.

[0005]

[Action]

 The effect is that when the rotor rotates, dynamic pressure is generated in the gas flow due to the centrifugal force due to the rotation at the opening of the air hole, while the static pressure of the gas flow at the opening is opposite to the height of the dynamic pressure. It changes in proportion. That is, when the dynamic pressure increases, the static pressure decreases. This dynamic pressure increases in proportion to the centrifugal force of the gas flow, which increases in proportion to the rotational speed of the rotor and the distance from the rotor shaft center of the opening of the air hole, and the static pressure is inversely proportional to the dynamic pressure. Becomes lower.

Therefore, at the openings at both ends of the air hole having different distances from the center of the rotor shaft, the dynamic pressure at the openings of the air holes having a larger distance from the center of the rotor shaft is Is higher than the dynamic pressure at the opening of the air hole with a smaller distance, and conversely, the static pressure at the opening of the air hole with a greater distance from the rotor shaft center is the air pressure with a smaller distance from the rotor shaft center. It becomes lower than the static pressure at the opening. Because the gas flow has the property of flowing from the side with higher static pressure to the side with lower static pressure, the cooling air inside the rotating electrical machine is separated from the center of the rotor shaft by the distance from the opening of the air hole that is smaller than the center of the rotor shaft. And flow toward the opening of the large air hole. An embodiment of the present invention will be described below with reference to the drawings.

[0007]

【Example】

 FIG. 1 is a half sectional view showing an embodiment of a rotor of a rotary electric machine according to the present invention. In FIG. 1, reference numeral 4a represents one opening of the air hole 4, 4b represents the other opening of the air hole 4, L represents a distance from the center of the rotor shaft 1 of the opening 4a, and M represents a rotor of the opening 4b. Distances from the center of the shaft 1 and having the same reference numerals as those in FIG. 2 indicate the same mechanical parts.

In FIG. 1, the distance L is set smaller than the distance M, and the air holes 4 penetrating the iron core retainer 3 and the rotor iron core 2 are inclined with respect to the rotor shaft 1. The air holes 4 are formed by machined holes, or by laminating thin steel plates with punched holes having different distances from the rotor shaft 1.

[0009]

[Effect of device]

 As described above, according to the present invention, since the air holes 4 are inclined with respect to the rotor shaft 1, when the rotor rotates, the peripheral speed of the opening 4b is greater than that of the opening 4a. Since it becomes higher, the static pressure in the opening 4b becomes lower than that in the inter-opening 4a, and the cooling air in the rotating electric machine is guided into the air holes 4 from the opening 4a toward the opening 4b. The flow and temperature rise of the rotor core 2 are suppressed, and the cooling effect of the rotor is great especially at high speed rotation.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of a rotary electric machine rotor of the present invention.

FIG. 2 is a half sectional view showing an example of a conventional rotary electric machine rotor.

[Explanation of symbols]

 1 Rotor Shaft 2 Rotor Iron Core 3 Iron Core Presser 4 Air Vent 4a Opening 4b Opening L Distance M Distance

Claims (1)

[Scope of utility model registration request] 1. A rotary electric machine having a rotor shaft, a rotor core, and iron core retainers fitted to both end faces of the iron core, and a plurality of air holes extending circumferentially through the iron core retainer and the iron core. In the rotor, the rotor of the rotary electric machine is characterized in that the distance from one of the openings of the air hole from the center of the rotor axis is different from the distance from the center of the rotor axis of the other opening.