JPH089595A - Cooler for permanent magnet synchronizer - Google Patents

Abstract

PURPOSE:To efficiently cool the end of a stator winding by solidifying both ends in axial direction of stator winding with thermosetting resin, thereby uniting them, and also, bonding them to the inner face of a stator frame, too. CONSTITUTION:A permanent magnet 2 is attached to the rotor iron core coupled with a rotor shaft 1. A stator winding 4 is inserted into the groove of a stator iron core 3, and it is attached the inside periphery of the stator frame 5. A cooling pipe 6 is buried in circumferential direction of the stator frame 5 so as to circulate cooling water. This is put vertically in axial direction in condition that the stator iron core 3 is attached to the stator frame 5, and tubular frames are set at both ends 4a of the stator windings at both ends in axial directions, and thermosetting resin 7 is let flow to these frames, and are heated and hardened. The thermosetting resin 7 adheres to both end faces in axial direction of the stator iron core 3 and the inside periphery of the stator frame. After hardening of the resin 7, the tubular frame are removed. Hereby, the heat of the end of the stator winding is cooled efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for cooling a stator of a permanent magnet synchronous machine in which a rotor is provided with a permanent magnet and the stator is water-cooled.

[0002]

2. Description of the Related Art A permanent magnet synchronous machine having a permanent magnet in a rotor field is easy to maintain and has a small size. Therefore, it is used in a transportation system or the like where the space for installation is limited.
Since the rotor of a permanent magnet synchronous machine with permanent magnets in the rotor field does not require excitation by the field winding, the Joule heat is extremely small, so there is no need to cool the rotor, but the stator Water cooling that can be effectively cooled is adopted. But,
The method of directly cooling the windings by passing cooling water through the stator windings requires a complicated winding structure and is expensive. Therefore, a cooling pipe was embedded in the stator frame supporting the stator core along the outer peripheral surface of the stator core, and a cooling water was circulated by using a pump and a cooler in the cooling pipe.

[0003]

However, in the method of embedding a cooling pipe in the stator core along the outer peripheral surface of the stator core and circulating cooling water in this cooling pipe, the outer diameter side of the stator core is cooled. However, there is a problem that the cooling of the stator winding ends is insufficient. Further, although the outer diameter side of the stator core is cooled, there is a problem that the axial end surface of the stator core is not sufficiently cooled.

An object of the present invention is to provide a cooling device capable of cooling the stator winding ends of a permanent magnet synchronous machine.

Another object of the present invention is to provide a cooling device capable of cooling the axial end of the stator core of a permanent magnet synchronous machine.

[0006]

In a permanent magnet synchronous machine for cooling a stator, the rotor is provided with a permanent magnet and water is passed through a cooling pipe arranged in a stator frame that supports a stator core. The ends of the stator windings on both sides are fixed with a thermosetting resin, and the integrated thermosetting resin is adhered to the axial end surface of the stator iron core and the inner diameter surface of the stator frame. To achieve.

Further, the rotor is provided with a permanent magnet, and water is passed through a cooling pipe arranged in a stator frame which supports a stator core,
In a permanent magnet synchronous machine that cools a stator, a heat transfer member made of an annular metal that is arranged at both axial ends of the stator core and is in contact with the axial end surface of the stator core and the inner diameter surface of the stator frame is provided. By the provision, the above object is achieved.

[0008]

In the present invention, the ends of the stator windings on both sides in the axial direction are hardened with a thermosetting resin, and the integrated thermosetting resin is combined with the axial end face of the stator core and the stator frame. By adhering to the inner diameter surface, the stator winding ends are covered with thermosetting resin to fill the gap between adjacent stator windings,
The resin was hardened and integrated, and the hardened resin was adhered to the axial end surface of the stator core and the inner diameter surface of the stator frame, so the heat generated from the end of the stator winding is transferred to the stator frame through the resin. It is possible to cool the end portion of the stator winding by transmitting and absorbing it in the cooling water flowing through the cooling pipe.

Further, since the heat transfer members made of an annular metal which are disposed at both axial ends of the stator core and contact the axial end faces of the stator core and the inner diameter face of the stator frame are provided, the shaft of the stator core is The heat generated from the end portions in the direction can be transferred to the stator frame via the heat transfer member and absorbed by the cooling water flowing through the cooling pipe to cool the end portions of the stator core.

[0010]

Embodiment 1 FIG. 1 is a longitudinal sectional view of a permanent magnet synchronization equipped with a cooling device in which the end portions of a stator winding of the present invention are hardened with a thermosetting resin. In FIG. 1, a permanent magnet 2 is attached to a rotor core coupled to a rotor shaft. The stator winding 4 is inserted into the groove of the stator core 3 and attached to the stator frame 5. A cooling pipe 6 is embedded in the circumferential direction of the stator frame 5 to cool the stator. Cooling water is circulated in the cooling pipe 6 by using a pump and a cooler (not shown). According to the present invention, the stator winding 4 is inserted into the stator core 3, and the stator core 3 is attached to the stator frame 5 and placed vertically in the axial direction. A cylindrical frame is fitted in 4a, and a thermosetting resin 7 (for example, epoxy resin) is poured into this frame to heat and then cure. At that time, the thermosetting resin 7 is adhered to both axial end faces of the stator core 3 and the inner peripheral surface of the stator frame. After the resin has hardened, remove the tubular frame. In this way, the heat of the stator winding end is transferred to the inner circumference of the stator frame 5 via the thermosetting resin 7, and is absorbed by the cooling water flowing through the cooling pipe 6 here. As a result, the stator winding end portion 4a can be effectively cooled.

Embodiment 2 FIG. 2 is a longitudinal sectional view of a permanent magnet synchronous machine having a stator core of the present invention provided with a cooling device composed of a heat transfer member. 2, the same parts as those in FIG. 1 are designated by the same reference numerals. The rotor shaft 1, the permanent magnets 2, the stator core 3, the stator windings 4, the stator frame 6, and the cooling pipes 7 are the same as those in FIG. The example of FIG. 2 is made of a metal having a high thermal conductivity, which is arranged at both ends of the stator core 3 in the axial direction and is in contact with the axial end surface of the stator core 3 and the inner peripheral surface of the stator frame 5. Heat transfer member 8
When two stator cores 3 are attached to the stator frame 5, the stator frame 5 is sandwiched by the heat transfer members 8 and placed on both end faces of the stator core 3 and fixed to the stator frame 5. . At this time, the outer diameter side surface of the heat transfer member 8 contacts the stator frame 5.
With this configuration, the heat of the end portions of the stator core is not transferred to the heat transfer member 8
The heat is transmitted to the inner circumference of the stator frame via the heat exchanger, and the heat is absorbed by the cooling pipe 6 through which the cooling water flows. As a result, the end portions of the stator core can be effectively cooled.

[0012]

According to the present invention, the end portions of the stator windings on both sides in the axial direction are hardened with a thermosetting resin, and the integrated thermosetting resin is applied to the end surface of the stator core and the inner surface of the stator frame. The heat generated from the stator winding ends is transferred to the inner surface of the stator frame where it is effectively absorbed and can cool the stator winding ends. In addition, since annular heat transfer members made of metal with high thermal conductivity that are in contact with the axial end surface of the stator core and the inner peripheral surface of the stator frame are provided at both axial ends of the stator core, The heat generated by the parts is transferred to the inner surface of the stator frame, where it is effectively absorbed and can cool the ends of the stator core.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a permanent magnet synchronous machine including a cooling device according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of a permanent magnet synchronous machine including a cooling device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Rotor Axis 2 Permanent Magnet 3 Stator Iron Core 4 Stator Winding 4a Stator Winding End 5 Stator Frame 6 Cooling Pipe 7 Thermosetting Resin 8 Heat Transfer Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuki Ishikawa 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Masahiko Tahara 2, Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (2)

[Claims] 1. A permanent magnet synchronous machine in which a rotor is provided with a permanent magnet, and water is passed through a cooling pipe arranged in a stator frame that supports a stator core to cool the stator. The permanent magnet synchronization, characterized in that the winding end portion is hardened with a thermosetting resin, and the thermosetting resin integrated is adhered to the axial end surface of the stator core and the inner diameter surface of the stator frame. Machine cooling system. 2. A permanent magnet synchronous machine in which a rotor is provided with a permanent magnet and water is passed through a cooling pipe arranged in a stator frame supporting a stator core to cool the stator, the shaft of the stator core being provided. A cooling device for a permanent magnet synchronous machine, comprising heat transfer members, which are arranged at both ends in a direction and are in contact with an axial end surface of the stator core and an inner diameter surface of the stator frame, the heat transfer members being made of an annular metal.