JPS6158440A - Rotor for high speed motor - Google Patents

Abstract

PURPOSE:To prevent generation of hissing air flow noise at plurality of radiator fins on a rotor by making them in ring shaped form respectively having different diameter, and in a concentrically arrangement to the rotational center of the motor at the end ring thereof. CONSTITUTION:Within slot 13 formed on peripheral portion of a rotor core 12 which is fixed on a rotor shaft 11, there is provided a conductor member 14 extending axially toward the shaft. An end ring 15 is provided at the end of the core 12, and both ends of the conductor member 14 are connected with the end ring 15 to constitute a cargo rotor winding. At the end face of the ring 15, there is provided a plurality of ring shaped radiator fins 16 respectively having different diameter in a concentric arrangement to the rotational center of the motor. With such a constitution, hissing air flow noise generated by the portion of the fins 16 is prevented even though the rotor rotates at high speed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotor of a high-speed motor, and more specifically,
This invention relates to a heat radiation structure for cooling a rotor.

[Prior art and problems]

As shown in FIGS. 3 and 4, in a conventional motor rotor, radiation fins 3 are arranged radially on the end surface of an end ring 2 fixed to an end of a rotor core 1. The heat generated as the rotor rotates is radiated by the heat radiation fins 3, but when the rotor is rotated at high speed (for example,
10,000 rpm or more), wind noise is generated at the radiation fins 3, and the noise increases. Furthermore, in the case of the radial heat dissipating fins 3, the resistance against the outside air increases during high speed rotation, so the motor wastes energy.

[Means for solving problems]

As a means for solving the above-mentioned problems, the present invention provides a plurality of ring-shaped radiation fins having different diameters arranged concentrically with respect to the rotation center of the rotor on the end face of an end ring fixed to the end of the rotor core. A rotor for a high-speed motor is provided.

[Effect]

According to the above means according to the present invention, the heat dissipation fins are ring-shaped and arranged concentrically with respect to the rotation center of the rotor, so even if the rotor rotates at high speed, the heat dissipation fins are free from air flow. Sound generation is prevented. Further, in the case of such a ring-shaped heat dissipating fin, the resistance to the high speed rotation of the outside air is extremely small, so that energy waste is prevented.

Furthermore, since a plurality of ring-shaped heat dissipation fins are used, the heat dissipation area of the entire heat dissipation fin increases, and cooling performance is improved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 and 2 of the drawings.

Referring to FIGS. 1 and 2, the rotor of the high-speed motor includes a rotor core 12 fixed to a rotating shaft 11. As shown in FIG. The rotor core 12 is made of a laminate of a large number of electromagnetic steel sheets. A plurality of slots (only one is shown in the figure) 1 extend in the axial direction on the outer periphery of the rotor core 12.
3 are formed at equal intervals in the circumferential direction, and a conductor member 14 extending in the axial direction is provided in each slot 13. End rings 15 are provided at both ends of the rotor core 12 (only one end is shown here), and both ends of each conductor member 14 are connected to the end rings 15 to form a squirrel-cage rotor winding. There is.

A plurality (here, three) of ring-shaped radiation fins 16 having different diameters are provided on the end face of the end ring 15 and arranged concentrically with respect to the rotation center of the rotor. Here, the radiation fins 16, the end ring 15, and the conductor member 14 are integrally formed with the rotor core 12 by casting aluminum.

In the rotor of a high-speed motor with the above configuration, the heat radiation fins 16 are ring-shaped and arranged concentrically with respect to the rotation center of the rotor, so even if the rotor rotates at high speed, the heat radiation fins 16 Wind noise is prevented from occurring at these locations. Further, in the case of such a ring-shaped heat dissipating fin 16, the resistance to the outside air during high-speed rotation is extremely small, so that energy waste is prevented. In addition, in the case of such a ring-shaped heat dissipation fin 16, the heat dissipation area of the entire heat dissipation fin is greatly increased compared to a radial heat dissipation fin, so that cooling performance during high-speed rotation of protons and protons is improved.

Although one embodiment has been described above, the present invention is not limited to the embodiment described above, and, for example, the number of ring-shaped radiation fins can be arbitrarily selected.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, wind noise is prevented from occurring at the ring-shaped radiation fins even if the rotor rotates at high speed. Therefore, it is possible to provide a rotor for a high-speed motor with less noise. In addition, in the case of such a ring-shaped radiation fin, the resistance against the outside air during high-speed rotation becomes extremely small, so that it is possible to provide a rotor for a high-speed motor that wastes less energy. Furthermore, in the case of such a ring-shaped heat dissipation fin, the heat dissipation area of the entire heat dissipation fin can be greatly increased compared to a radial heat dissipation fin, so that a rotor of a high-speed motor with high cooling performance can be provided.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a rotor of a high-speed motor showing an embodiment of the present invention, FIG. 2 is an end view of the rotor shown in FIG. 1, and FIG. 3 is a rotor of a conventional motor. FIG. 4 is an end view of the rotor shown in FIG. 3. FIG. 12--Rotor core, 15--End ring, 1
6-・-Radiating fin.

Claims (1)

[Claims] 1. A plurality of ring-shaped radiation fins having different diameters are arranged concentrically with respect to the rotation center of the rotor on the end face of an end ring fixed to the end of the rotor core. The rotor of a high-speed motor. 2. The rotor of a high-speed motor according to claim 1, wherein the radiation fins are integrally formed with the end ring by casting with respect to the rotor core.