JPH03143247A - Cooler of permanent magnet synchronous machine - Google Patents

Abstract

PURPOSE:To cool the coil end of a stator winding efficiently by providing a yoke ring with water passage holes which pierce it in the axial direction, and arranging a water chamber on both ends of each water passage hole, and then making adjacent water passage communicate with each other so as to circulate cooling water continuously. CONSTITUTION:A cooler is composed of plural water passage hole, which pierce a yoke ring 5 in the axial direction, plural water chambers 7, which are positioned on both ends of the yoke ring 5 and make respective adjacent water passage holes 6 communicate with each other to circulate cooling water continuously, and cooling fins 8, which are attached to these water chambers 7. According to this constitution, the water chambers 7 and the cooling fins 8 absorb the heat generated from the coil end of a stator winding 4 by natural connection and circulate cooling water, so the coil end of a stator winding can be cooled efficiently.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a cooling device for cooling the coil ends of a stator winding of a permanent magnet synchronous machine that has a rotor equipped with a permanent magnet and that cools the stator with water.

[Conventional technology]

The permanent magnet distance 1υI machine with permanent magnets in the rotor field is
Since it is easy to maintain and has small dimensions, it is used in marine applications where installation space is limited. The rotor of a permanent magnet synchronous machine with a permanent magnet in the rotor field does not require excitation by the field winding, so it generates extremely little Joule heat, so there is no need to cool the rotor, but the stator is Water cooling is used for cooling. However, the method of directly cooling the windings by passing cooling water into the stator windings requires a complicated structure of the windings and is expensive. Therefore, water holes were drilled in the yoke ring that supported the stator core along the outer circumferential surface of the core, and cooling water was passed through the holes to cool the stator. Cooling water was circulated using a water tank, pump, and cooler.

[Problem to be solved by the invention]

However, with the method of drilling water holes in the stator yoke ring along the outer circumferential surface of the core and passing cooling water through the holes, there is a problem in that the coil ends of the stator windings are insufficiently cooled. Ta. An object of the present invention is to provide a cooling device for a permanent magnet synchronous machine that can cool the coil ends of a stator winding.

[Means to solve the problem]

The above object is to provide a permanent magnet synchronous machine in which a rotor is equipped with a permanent magnet and a stator is water-cooled, with a plurality of water passage holes extending axially through a yoke ring that supports a stator core, and a plurality of water passage holes in the yoke ring. It is distantly related by comprising a plurality of water chambers located at both ends in the axial direction and communicating with the adjacent water holes so as to allow cooling water to flow continuously, and cooling fins attached to the water chambers. .

[For use]

A plurality of water holes that axially pass through the yoke ring that supports the stator core, and water chambers located at both axial ends of the yoke ring allow adjacent water holes to communicate with each other to continuously supply cooling water. Since the cooling fins are attached to this water chamber, the heat generated from the coil ends is absorbed by natural convection, and the stator windings are cooled. The coil end can be cooled.

【Example】

The present invention will be described in detail below based on the drawings. FIG. 1 is a longitudinal sectional view of a permanent magnet synchronous machine equipped with a cooling device according to an embodiment of the present invention, and FIG. 2 is a developed view of the stator shown in FIG. 1. In Figure 1, a permanent magnet 2 is placed on the rotor shaft 1''.
Fix with adhesive. A stator core 3 and a stator winding 4 are provided facing the permanent magnet 2, and the stator core 3 is supported by a yoke ring 5 attached to the stator frame. A plurality of water holes 6 passing through the yoke ring 5 in the axial direction, and located at both ends of the yoke ring 5,
A cooling device was constructed from a plurality of water chambers 7 that communicated with adjacent water passage holes 6 and cooling fins 8 attached to the water chambers 7 so that cooling water could flow continuously. The cooling water is
It is circulated using a water tank, pump, and cooler (not shown). As shown in FIG. 2, a continuous water channel is formed by a plurality of axial water holes 6 passing through the yoke ring 5 and water chambers 7 arranged in a staggered manner at both ends of the water holes 6. Cooling fins 8 are provided on the outside of the water chamber 7 to enhance the cooling effect. Heat generated at the coil end of the stator winding 4 is absorbed by natural convection by the protruding water chamber 7 and cooling fins 8. Arrows indicate the flow of cooling water. FIG. 3 is a longitudinal sectional view of a permanent magnet synchronous machine equipped with a cooling device according to another embodiment of the present invention, and FIG. 4 is a developed view of the stator of FIG. 3. In FIG. 3, U-shaped pipes 9 having a large number of cooling fins 8 and located at both ends of the yoke ring 5 in the axial direction are used as water chambers to communicate adjacent water passage holes 6. Cooling water flows through the water passage hole 5 and the pipe 9 as shown by the arrow. The pipe 9 serving as a water chamber expands the heat transfer area and cools the coil ends of the stator winding 4 over a wide range.

【Effect of the invention】

This invention allows cooling water to flow continuously through a plurality of water holes passing through a yoke ring in the axial direction and a water chamber communicating with the water holes, and cooling fins are provided in the water chamber. Since the heat generated from the coil ends of the stator windings is absorbed by the water chamber and the cooling fins by natural convection and the cooling water is circulated, the coil ends of the stator windings can be cooled. Furthermore, since a U-shaped pipe having a large number of cooling fins is used as the water chamber, it is possible to effectively cool the :1 end of the stator winding.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a permanent magnet synchronous machine equipped with a cooling device according to an embodiment of the present invention, FIG. 2 is an exploded view of the stator of FIG. 1, and FIG. 3 is according to another embodiment of the present invention. A vertical cross-sectional view of a permanent magnet synchronous machine with a cooling device installed, Figure 4 is
FIG. 3 is a developed view of the stator shown in the figure. 1: Rotor shaft, 2: Permanent magnet, 3: Stator core, 4: Stator winding, 5: Yoke ring, 6: Water hole, 7: Water chamber, 8
: Cooling fin, 9: Pipe as water chamber.

Claims (1)

[Claims] 1) In a permanent magnet synchronous machine that includes a permanent magnet in the rotor and water cools the stator, a plurality of water holes that axially penetrate a yoke ring that supports the stator core, and a plurality of water holes that axially penetrate the yoke ring that supports the stator core; A permanent magnet synchronous machine characterized by comprising a plurality of water chambers located at both ends and communicating with the adjacent water holes so as to continuously circulate cooling water, and cooling fins attached to the water chambers. cooling system.