JPH0937518A - Enclosed permanent magnet motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To isolate permanent magnets thermally from the inside air which is heated by the end parts of armature windings and radiate the heat of the inside air of a motor from side plates. SOLUTION: Nonmagnetic discs 11 which are attached to both the ends in the axial direction of a rotor core 8, nonmetallic rings 12 which are supported near the outer diameter sides of the discs 11 and protrude in the axial direction and fans 13 which are attached to the outer diameter sides of the rings 12 are provided to isolate permanent magnets 9 from the inside air which is heated by the heat of the ends 3 of armature windings and avoid the deterioration of the permanent magnets 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature fixed type permanent magnet motor which is hermetically sealed by a main frame and side plates.

[0002]

2. Description of the Related Art FIG. 5 is a vertical cross-sectional view of a conventional fixed armature-type hermetically sealed permanent magnet motor. In FIG. 5, the armature winding 2 is housed in the armature core 1, and the armature winding end portions 3 project to both sides in the axial direction. A rotor core 8 is provided on the shaft 7, and a permanent magnet 9 is attached to the outer diameter side of the rotor core 8. The entire motor is sealed by a main frame 4 and side plates 5, and a cooling water system 6 is provided in the main frame 4 to circulate the cooling water. The outer diameter side of the armature core 1 is in close contact with the main frame 4, and the heat generated from the armature winding 2 is dissipated to the outside via the armature core 1 and the cooling water system 6.

[0003]

In the conventional structure, most of the heat generated from the armature winding end portion 3 is released to the inside air, and the inside air heats the permanent magnet 9 to deteriorate the heat of the permanent magnet 9. Was sometimes invited.

An object of the present invention is to cut off the heat of the permanent magnets from the inside air heated by the armature winding ends and to dissipate the heat of the inside air of the motor from the side plate.

[0005]

In a closed permanent magnet motor having a permanent magnet on the surface of a rotor and sealed by a main frame and side plates, the permanent magnets are mounted on both ends of a rotor core in an axial direction. A non-magnetic disc-shaped disc, a non-metal ring supported near the outer diameter side of this disc and protruding in the axial direction to partition the armature side space and the rotor side space, and the outer diameter side of this ring. By providing a fan attached to the permanent magnet, the permanent magnet can be thermally shielded from the inside air heated by the heat generated at the end of the armature winding. Furthermore, the heat of the inside air can be dissipated through the side plate by stirring the inside air by the fan attached to the outer diameter side of the ring.

If the cooling fins projecting from the inner surface of the side plate are provided, it is suitable for exchanging the heat of the inside air of the motor through the side plate.

If the cooling fin is formed in a spiral pattern centered on the shaft through hole, it is suitable for exchanging heat of the inside air of the motor through the side plate.

If the cooling fin is formed in a radial pattern centered on the shaft through hole, it is suitable for exchanging heat of the inside air of the motor through the side plate.

Further, if the cooling fin is formed with a concavo-convex pattern consisting of a plurality of protrusions, it is suitable for exchanging heat of the inside air of the motor through the side plate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a vertical sectional view of a hermetically sealed permanent magnet motor showing an embodiment of the present invention. 1, the same parts as those in FIG. 5 are denoted by the same reference numerals. According to the present invention, the non-magnetic disk-shaped disk 11 is attached to both ends of the rotor core 8 in the axial direction, and the disk is supported near the outer diameter side of the disk 11 and projects in the axial direction to rotate with the armature-side space. A non-metal ring 12 that partitions the child space and a fan 13 that is attached to the outer diameter side of the ring 12 are provided. The disk 11 is provided to fix the ring 12, and is screwed to the rotor core 8. The ring 12 is made of, for example, epoxy glass, and may be screwed to the disk 11, adhered thereto, or formed integrally with the disk 11. The main frame 4 and the side plate 5 are made of aluminum. The fan 13 is configured by screwing a plurality of blades onto the ring 12. In this way, the permanent magnet 9 is thermally shielded from the inside air 10 heated by the heat generation of the armature winding end portion 3. Further, the inside air 10 near the armature winding end portion 3 is agitated by the fan 13 provided in the ring 12, and the inside air 10 is heat-exchanged with the inner surface 14 of the side plate. As a result, deterioration of the permanent magnet can be prevented.

Embodiment 2 FIG. 2A is a view taken in the direction of arrow A in FIG. 1, and FIG. 2B is B in FIG.
FIG. In FIG. 2 (A), the side plate 5 has a shaft through hole 15 in the center thereof, and a spiral pattern 16 as a cooling fin is provided on the inner surface 14 of the side plate. Spiral pattern 1
As shown in (B), 6 is a thin strip shape and is formed integrally with the side plate 5 made of aluminum. Inside air 1 swirling in the direction of rotation of the rotor by this spiral pattern 16
A turbulent flow is created at 0 to effectively exchange heat between the inside air 10 and the side plate 5.

Embodiment 3 FIG. 3 (A) is a view in the direction of arrow A showing another embodiment of FIG. 1, and FIG. 3 (B) is an enlarged sectional view of a portion B in (A). FIG.
In (A), the side plate 5 has a shaft through hole 15 in the center,
Radial patterns 17 as cooling fins on the inner surface 14 of the side plate
Was provided. The radial pattern 17 has a thin strip shape as shown in (B) and is formed integrally with the side plate 5 made of aluminum. This radial pattern 17 creates a turbulent flow in the inside air 10 that swirls in the direction of rotation of the rotor,
And heat exchange between the side plate 5 and the side plate 5.

Embodiment 4 FIG. 4 (A) is a view in the direction of an arrow A showing another embodiment of FIG. 1, and FIG. 4 (B) is an enlarged sectional view of a portion B in (A). FIG.
In (A), the side plate 5 has a shaft through hole 15 in the center,
A concavo-convex pattern 18 composed of a plurality of protrusions serving as cooling fins was provided on the inner surface 14 of the side plate. The uneven pattern 18 is (B)
As shown in FIG. 5, it has a truncated cone shape and is formed integrally with the side plate 5 made of aluminum. The uneven pattern 18 creates a turbulent flow in the inside air 10 that swirls in the rotation direction of the rotor, and makes the heat exchange between the inside air 10 and the side plate 5 effective.

[0014]

According to the present invention, a non-magnetic disk-shaped disk mounted on both axial ends of a rotor core, and an armature-side space supported near the outer diameter side of the disk and protruding in the axial direction. Since a non-metallic ring that separates the rotor from the rotor-side space and a fan attached to the outer diameter side of this ring are provided, the permanent magnet is heated from the inside air heated by the heat generated at the end of the armature winding. It can be shut off to prevent deterioration of the permanent magnet.

If the cooling fins projecting from the inner surface of the side plate are provided, heat exchange between the inside air heated by the heat generated at the end of the armature winding and the side plate can be effectively performed, and the armature winding end can be effectively exchanged. The heat generated from the part can be efficiently released to the outside.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a sealed permanent magnet motor showing an embodiment of the present invention.

FIG. 2 (A) is a view from the direction of arrow A in FIG. 1, (B) is (A).
It is a B section expanded sectional view.

3A is a view in the direction of arrow A showing another embodiment of FIG. 1, and FIG. 3B is an enlarged sectional view of a B part in FIG. 3A.

4A is a view in the direction of arrow A showing another embodiment of FIG. 1, and FIG. 4B is an enlarged sectional view of a B portion in FIG. 4A.

FIG. 5 is a vertical cross-sectional view of a conventional sealed permanent magnet motor.

[Explanation of symbols]

 1 Armature Iron Core 2 Armature Winding 3 Armature Winding End 4 Main Frame 5 Side Plate 6 Cooling Water System 7 Shaft 8 Rotor Iron Core 9 Permanent Magnet 10 Inside Air 11 Disk 12 Ring 13 Fan 14 Side Plate Inner Surface 15 Shaft Through Hole 16 Cooling Spiral pattern as fin 17 Radial pattern as cooling fin 18 Concavo-convex pattern as cooling fin

 ─────────────────────────────────────────────────── ─── Continued front page (72) Shigenori Kinoshita 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. (72) Hiroyuki Hirano 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Nissan Motor Incorporated (72) Inventor Shinichiro Kitada 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Yutaro Kaneko 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (5)

[Claims] 1. A hermetically sealed permanent magnet motor having a permanent magnet on the rotor surface and hermetically sealed by a main frame and side plates, and a non-magnetic disk attached to both axial ends of a rotor core. -Shaped disc, a non-metal ring supported near the outer diameter side of this disc and protruding in the axial direction to partition the armature side space and the rotor side space, and attached to the outer diameter side of this ring A hermetically sealed permanent magnet motor provided with a fan. 2. The closed permanent magnet motor according to claim 1, wherein cooling fins projecting from the inner surface of the side plate are provided. 3. The closed permanent magnet motor according to claim 2, wherein the cooling fins form a spiral pattern centered on the shaft through hole. 4. The closed permanent magnet motor according to claim 2, wherein the cooling fins form a radial pattern centered on the shaft through hole. 5. The hermetically sealed permanent magnet motor according to claim 2, wherein the cooling fins have an uneven pattern composed of a plurality of protrusions.