Stator sealing structure of permanent magnet motor at high temperature

Abstract

The utility model discloses a stator sealing structure of a permanent magnet motor at high temperature. The stator sealing structure comprises a casing, a stator core and a cover plate, the stator core is installed in the casing, the casing is provided with a groove, the stator core is provided with a boss, the boss is fixedly installed in the groove, and the cover plate is fixedly installed in a gap between the casing and the stator core. According to the utility model, the fixing problem of the stator iron core and the casing at the high temperature of 240 DEG C is solved, and the matching reliability is improved; and secondly, the stator iron core, the cover plate and the casing are welded through laser, so that the stator achieves the purpose of sealing, and the permanent magnet motor meets the requirement of air tightness and can normally work at high temperature.

Description

Technical Field

[0001] The utility model belongs to the field of electric motors, in particular to a stator sealing structure of a permanent magnet motor under high temperature. Background Art

[0002] Permanent magnet motor is a motor that uses permanent magnets to generate the magnetic field of the motor. It has the advantages of high efficiency, energy saving and high reliability. The working principle of permanent magnet motor is to use permanent magnets to generate magnetic fields. The interaction between magnetic fields and currents generates torque to drive the motor to rotate. As a motor with high efficiency, energy saving and high reliability, permanent magnet motor has a wide range of application prospects, including industrial automation, automobiles, electric vehicles, wind power and solar energy.

[0003] The permanent magnet motor of the utility model needs to be installed in the pressure regulating valve of a large aircraft to perform stepless regulation of the pressure of the control chamber. Therefore, at a high temperature of 240°C, the permanent magnet motor of the utility model must not only work normally, but also meet the airtightness requirements. The regulating valve is located near the engine, and the working environment temperature can reach up to 240°C. Because the stator core and the casing wall are relatively thin, and the permanent magnet motor needs to be airtight, it cannot be fixed with fasteners such as screws and pins.

[0004] The stator core and the casing of the traditional permanent magnet motor are mostly matched in a circumferential manner, that is, an appropriate amount of adhesive is applied between the outer circle of the stator core and the inner hole of the casing for bonding or the hole-axis interference fit is adopted to prevent relative rotation. At high temperatures, the adhesive is prone to aging and failure, and the interference fit is affected by the different thermal expansion coefficients of different materials, which greatly reduces the reliability of the fit. Therefore, the permanent magnet motor of the utility model cannot meet the requirements using the traditional structure and process. Summary of the invention

[0005] The utility model aims to provide a stator sealing structure of a permanent magnet motor under high temperature, so as to solve the technical problem of low matching reliability of the existing sealing structure.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A stator sealing structure of a permanent magnet motor under high temperature, comprising a housing, a stator core and a cover plate;

[0008] The stator core is installed in the casing, a groove is arranged on the casing, a boss is arranged on the stator core, the boss is fixedly installed in the groove, and the cover plate is fixedly installed in the gap between the casing and the stator core.

[0009] Furthermore, a mounting groove is provided on the stator core, and a permanent magnet is embedded in the mounting groove.

[0010] Furthermore, the stator core is a block structure.

[0011] Furthermore, two stator cores are arranged in the casing, and the two stator cores constitute the stator.

[0012] Furthermore, the boss is arranged on the outer edge of the stator core, and the groove is arranged on the outer edge of the casing.

[0013] Furthermore, the boss is fully welded and fixed to the contact surface of the groove by laser welding.

[0014] Furthermore, the cover plate is fully welded and fixed to the contact surface of the casing by laser welding.

[0015] Furthermore, the laser welding method is laser energy welding with double-layer filler filling.

[0016] Furthermore, the cover plate is a wedge-shaped structure.

[0017] Furthermore, the material of the cover plate is the same as that of the casing.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model provides a stator sealing structure for a permanent magnet motor under high temperature. After the stator core and the casing are assembled, the boss on the outer circle of the stator core matches with the groove on the casing. After laser welding, the stator core and the casing are prevented from relative rotation. A wedge-shaped cover plate is used to fill the gap between the stator core and the casing, and finally the cover plate and the casing are laser welded. The utility model first solves the problem of fixing the stator core and the casing under high temperature of 240°C and improves the matching reliability. Second, the stator core, the cover plate and the casing are laser welded to achieve the purpose of sealing the stator, so that the permanent magnet motor meets the airtightness requirements and can work normally under high temperature.

[0020] Furthermore, the material of the cover plate is the same as that of the casing, and can be better integrated together during the welding process, thereby achieving fast, efficient, and high-quality welding and improving the reliability and stability of welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the stator sealing structure of the permanent magnet motor under high temperature of the utility model.

[0023] Among them: 1- housing, 2- stator core, 3- permanent magnet, 4- cover plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] The utility model is further described in detail below with reference to the accompanying drawings:

[0031] See also Figure 1 The utility model provides a stator sealing structure of a permanent magnet motor under high temperature, comprising a casing 1, a stator core 2 and a cover plate 4.

[0032] Two stator cores 2 are arranged in the housing 1. The stator cores 2 are block structures. The two stator cores 2 constitute the stator of the permanent magnet motor. The stator cores 2 are provided with mounting grooves, and the permanent magnets 3 are embedded in the mounting grooves. The two stator cores 2 and the two permanent magnets 3 are respectively installed in the housing 1.

[0033] A boss is provided on the outer edge of the stator core 2, and a groove is provided on the outer edge of the housing 1. The position of the groove corresponds to the position of the boss, so that the boss can fit into the groove to prevent the stator core 2 and the housing 1 from rotating relative to each other. The boss on the stator core 2 is inserted into the groove on the housing 1, and the boss of the stator core 2 and the groove of the housing 1 are fully welded and fixed by laser energy (power) welding with double-layer filler filling on the fitting surface.

[0034] The cover plate 4 is a wedge-shaped structure, which matches the remaining space after the stator core 2 and the housing 1 are welded. The cover plate 4 is fixedly installed in the gap between the housing 1 and the stator core 2 to fill the gap between the stator core 2 and the housing 1. The contact surface between the cover plate 4 and the housing 1 is fully welded and fixed by laser energy (power) welding with double-layer filler filling. The material of the cover plate 4 is the same as that of the housing 1. During the welding process, the cover plate 4 can be better integrated with the housing 1, which can achieve fast, efficient and high-quality welding, and improve welding strength and reliability.

[0035] In a specific embodiment of the present utility model, two bosses are provided on each stator core 2 , and four grooves are provided on the housing 1 to match the four bosses of the stator core 2 , and the four bosses are inserted into the four grooves of the housing 1 .

[0036] In another specific embodiment of the present invention, four cover plates 4 are installed in the gap between the casing 1 and the stator core 2 to fill the gap between the stator core 2 and the casing 1 .

[0037] The assembly process of the stator sealing structure of the permanent magnet motor under high temperature of the utility model is as follows:

[0038] Install two stator cores 2 and two permanent magnets 3 into the casing 1 respectively. During assembly, pay attention to inserting the boss of the stator core 2 into the groove of the casing 1. After assembly, the contact surface between the boss on the stator core 2 and the groove on the casing 1 is fully welded and fixed by laser energy (power) welding with double-layer filler filling by laser welding. After welding, any cover plate 4 is installed between the casing 1 and the stator core 2 to fill the gap between the stator core 2 and the casing 1, and then the contact surface between the cover plate 4 and the casing 1 is fully welded and fixed by laser welding. Then, the assembly and welding of the remaining cover plates 4 are completed in sequence. This structure can not only ensure structural reliability, but also meet the airtightness requirements.

[0039] The utility model solves the problem of fixing the stator core 2 and the casing 1 at a high temperature of 240°C, greatly improving the fixing reliability, and also achieves the purpose of sealing the stator by laser welding the stator core 2, the cover plate 4 and the casing 1, so that the airtightness of the permanent magnet motor can meet the requirements, thereby enabling the permanent magnet motor to operate normally at high temperatures.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stator sealing structure of a permanent magnet motor at high temperature, characterized in that: It comprises a casing (1), a stator core (2) and a cover plate (4); The stator core (2) is installed in the casing (1), the casing (1) is provided with a groove, the stator core (2) is provided with a boss, the boss is fixedly installed in the groove, and the cover plate (4) is fixedly installed in the gap between the casing (1) and the stator core (2).

2. The stator sealing structure of a permanent magnet motor at high temperature according to claim 1, characterized in that: The stator core (2) is provided with a mounting groove, and a permanent magnet (3) is embedded in the mounting groove.

3. The stator sealing structure of a permanent magnet motor at high temperature according to claim 1, characterized in that: The stator core (2) is a block structure.

4. The stator sealing structure of a permanent magnet motor at high temperature according to claim 1, characterized in that: Two stator cores (2) are arranged in the casing (1), and the two stator cores (2) constitute a stator.

5. The stator sealing structure of a permanent magnet motor at high temperature according to claim 1, characterized in that: The boss is arranged on the outer edge of the stator core (2), and the groove is arranged on the outer edge of the casing (1).

6. The stator sealing structure of a permanent magnet motor at high temperature according to claim 1, characterized in that: The boss is fully welded and fixed to the contact surface of the groove by laser welding.

7. The stator sealing structure of a permanent magnet motor at high temperature according to claim 1, characterized in that: The cover plate (4) is fully welded and fixed to the contact surface of the casing (1) by laser welding.

8. A stator sealing structure for a permanent magnet motor at high temperature according to claim 6 or 7, characterized in that: The laser welding method is double-layer filler-filled laser energy welding.

9. The stator sealing structure of a permanent magnet motor at high temperature according to claim 1, characterized in that: The cover plate (4) is a wedge-shaped structure.

10. The stator sealing structure of a permanent magnet motor at high temperature according to claim 1, characterized in that: The material of the cover plate (4) is the same as that of the casing (1).

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