阅读说明：本技术 一种基于高导热材料增强永磁电机冷却的系统及其工作方法 (System for enhancing cooling of permanent magnet motor based on high-heat-conductivity material and working method thereof ) 是由 阮炯明 罗城鑫 林达 赵大周 周宇昊 张海珍 于 2019-09-12 设计创作，主要内容包括：本发明公开了一种基于高导热材料增强永磁电机冷却的系统及其工作方法,主要用于高转速、小体积、高功率密度的永磁电机,包括定子绕组和定子铁芯,还包括高导热材料热量导出装置和冷却系统,高导热材料热量导出装置的一端与定子绕组接触,高导热材料热量导出装置的另一端与冷却系统连接；冷却系统包括冷却腔体,且冷却腔体上设置有冷却液出口和冷却液入口,冷却腔体内设置有高导热材料冷却段,且高导热材料热量导出装置与高导热材料冷却段连接；定子绕组包括线圈,且线圈的两侧接触设置有高导热材料体,高导热材料热量导出装置与高导热材料体连接。本发明结构简单,可以明显改善电机温度分布的均匀性,强化高速永磁电机定子绕组的散热能力。(The invention discloses a system for enhancing the cooling of a permanent magnet motor based on a high heat conduction material and a working method thereof, which are mainly used for the permanent magnet motor with high rotating speed, small volume and high power density, and comprise a stator winding and a stator core, and also comprise a high heat conduction material heat leading-out device and a cooling system, wherein one end of the high heat conduction material heat leading-out device is contacted with the stator winding, and the other end of the high heat conduction material heat leading-out device is connected with the cooling system; the cooling system comprises a cooling cavity, a cooling liquid outlet and a cooling liquid inlet are formed in the cooling cavity, a high-heat-conduction-material cooling section is arranged in the cooling cavity, and the high-heat-conduction-material heat guiding device is connected with the high-heat-conduction-material cooling section; the stator winding comprises a coil, high-heat-conducting material bodies are arranged on two sides of the coil in a contact mode, and the high-heat-conducting material heat guiding device is connected with the high-heat-conducting material bodies. The invention has simple structure, can obviously improve the uniformity of the temperature distribution of the motor and strengthen the heat dissipation capability of the stator winding of the high-speed permanent magnet motor.)

1. A system for enhancing cooling of a permanent magnet motor based on high heat conduction materials comprises a stator winding (1) and a stator core (4), wherein the stator winding (1) is wound on the stator core (4), and the stator winding (1) is supported in a groove of the stator core (4); the high-heat-conduction material heat conduction device is characterized by further comprising a high-heat-conduction material heat conduction device (2) and a cooling system (3), wherein one end of the high-heat-conduction material heat conduction device (2) is in contact with the stator winding (1), and the other end of the high-heat-conduction material heat conduction device (2) is connected with the cooling system (3); the cooling system (3) comprises a cooling cavity (19), a cooling liquid outlet (17) and a cooling liquid inlet (18) are formed in the cooling cavity (19), a high-heat-conduction-material cooling section (20) is arranged in the cooling cavity (19), and the high-heat-conduction-material heat guiding device (2) is connected with the high-heat-conduction-material cooling section (20); the stator winding (1) comprises a coil (12), high-heat-conducting material bodies (16) are arranged on two sides of the coil (12) in a contact mode, and the high-heat-conducting material heat exporting device (2) is connected with the high-heat-conducting material bodies (16).

2. The system for enhancing the cooling of the permanent magnet motor based on the high thermal conductivity material is characterized in that the stator winding (1) comprises two layers of spiral wound coils (12), the coils (12) are processed by F-grade insulating materials and epoxy resins, an interlayer gasket (13) is arranged between the upper layer of coils (12) and the lower layer of coils (12), an inter-row vertical partition plate (11) is arranged in the middle of each coil (12), and a main insulating layer (15) wraps the outer portion of each coil (12); a groove bottom gasket (14) is arranged in a groove of the stator core (4), and a main insulating layer (15) at the upper end of the upper-layer coil (12) is in contact with the groove bottom gasket (14); the slot wedge (9) is connected with a main insulating layer (15) at the lower end of the lower coil (12) through an adjusting gasket (10).

3. The system for enhanced cooling of permanent magnet machines based on highly thermally conductive materials as set forth in claim 1 wherein said body (16) of highly thermally conductive material has a thermal conductivity more than two orders of magnitude higher than pure copper.

4. A method for operating a system for enhancing cooling of a permanent magnet motor based on high thermal conductivity material according to any one of claims 1-3, characterized by the following steps: when the high-speed permanent magnet motor runs, heat loss is generated when current flows through a stator winding (1), through reasonable arrangement of a coil (12) and a high-heat-conducting material body (16), the heat quantity of the coil (12) is efficiently led out, the heat quantity is led out to a high-heat-conducting material heat leading-out device (2) positioned at two sides of the stator winding (1) and then led out to a cooling system (3), a cooling section (20) of the high-heat-conducting material is cooled by the cooling system (3), the temperature in a cooling cavity (19) is controlled by a constant temperature device, under the action of a micro pump, cooling liquid in the cooling system (3) ensures constant temperature through a cooling liquid inlet (18) and a cooling liquid outlet (17), the high-efficiency cooling capacity of the cooling system (3) is matched with the high-heat-conducting capacity of the high-heat-conducting material body (16), so that the temperature of the coil (12) of the high-, the safe, efficient and stable operation of the permanent magnet motor is ensured.

Technical Field

The invention relates to a cooling system, which is mainly used for a permanent magnet motor with high rotating speed, small volume and high power density, belongs to the technical field of motor heat dissipation, and mainly relates to a system for enhancing the cooling of the permanent magnet motor based on a high heat conduction material and a working method thereof.

Background

Because the high-speed permanent magnet motor does not need a speed reducing mechanism such as a gear and the like, the high-speed permanent magnet motor has the remarkable advantages of small motor volume, high power density, high efficiency and the like, and has wide application prospect in the aspects of high-speed compressors, energy storage flywheels, textiles, high-speed grinding machines and the like; the high-speed generator driven by the gas turbine has small volume, high efficiency and strong maneuverability, can be used as a standby power supply of important facilities, and also can be used as an independent power supply or a small power station, so that the high-speed permanent magnet motor has important practical value.

However, just because the high-speed permanent magnet motor has a small volume and a large power density, the high-speed permanent magnet motor is difficult to dissipate heat, and for example, in chinese patent application publication No. CN108258852A, published as 2018, 7 and 6, a stator insulating material is aged due to an excessively high temperature, and the insulating property of the insulating material is reduced, thereby causing a turn-to-turn short circuit of a motor winding. Therefore, the temperature rise of the motor restricts the development and application of the high-speed permanent magnet motor, a good cooling system of the high-speed permanent magnet motor is developed, the reasonable temperature rise of the motor can be controlled, the service life of a rotor permanent magnet and winding insulation is prolonged, and the long-term safe and stable operation of the high-speed permanent magnet motor is ensured.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a system for enhancing the cooling of a permanent magnet motor based on a high-thermal-conductivity material and a working method thereof. When the high-speed permanent magnet motor runs, because of the resistance, when the current flows through the stator winding, the heat loss is generated.

The technical scheme adopted by the invention for solving the problems is as follows: a system for enhancing cooling of a permanent magnet motor based on high heat conduction materials comprises a stator winding and a stator core, wherein the stator winding is wound on the stator core, and the stator winding is supported in a groove of the stator core; the high-heat-conduction material heat conduction device is characterized by further comprising a high-heat-conduction material heat conduction device and a cooling system, wherein one end of the high-heat-conduction material heat conduction device is in contact with the stator winding, and the other end of the high-heat-conduction material heat conduction device is connected with the cooling system; the cooling system comprises a cooling cavity, a cooling liquid outlet and a cooling liquid inlet are formed in the cooling cavity, a high-heat-conduction-material cooling section is arranged in the cooling cavity, and the high-heat-conduction-material heat guiding device is connected with the high-heat-conduction-material cooling section; the stator winding comprises a coil, high-heat-conducting material bodies are arranged on two sides of the coil in a contact mode, and the high-heat-conducting material heat guiding device is connected with the high-heat-conducting material bodies.

furthermore, the stator winding comprises two layers of spiral wound coils, the coils are processed by F-level insulating materials and epoxy resin, an interlayer filler strip is arranged between an upper layer coil and a lower layer coil, the middle part of each coil is provided with a row-spacing vertical partition plate, and the outside of each coil is wrapped with a main insulating layer; a groove bottom gasket is arranged in the groove of the stator core, and the main insulating layer at the upper end of the upper-layer coil is in contact with the groove bottom gasket; the slot wedge is connected with the main insulating layer at the lower end of the lower coil through an adjusting gasket.

Further, the stator winding is wound on a silicon steel sheet of the stator core; the stator core is formed by combining thin silicon steel sheets, and insulating paint is coated on two surfaces of each lamination.

Furthermore, the heat guiding device with the high heat conduction material is led out to the cooling system in a hole opening mode of the shell of the permanent magnet motor body; the cooling system adopts a liquid cooling mode.

Furthermore, the high-thermal-conductivity material body has extremely high thermal conductivity coefficient, and can efficiently lead out heat generated when a motor stator winding runs under load; the thermal conductivity of the high thermal conductivity material body is at least two orders of magnitude higher than that of pure copper; the high-thermal-conductivity material body has the characteristics of electric conduction and magnetic non-conduction, and in order to prevent electric leakage, the outside of the high-thermal-conductivity material body is treated by F-level material insulation and epoxy resin.

Further, the cooling section with high heat conduction material can be designed and processed into different shapes to enhance the cooling effect.

The working method of the system for enhancing the cooling of the permanent magnet motor based on the high heat conduction material is characterized by comprising the following steps of: when the high-speed permanent magnet motor operates, heat loss is generated when current flows through a stator winding, through reasonable arrangement of the coil and the high-heat-conducting material body, the heat of the coil is efficiently led out, the heat is led out to the high-heat-conducting material heat leading-out devices positioned on two sides of the stator winding and then led out to the cooling system, the cooling section of the high-heat-conducting material is cooled by the cooling system, the temperature in the cooling cavity is controlled by the constant temperature device, the cooling liquid in the cooling system is kept constant in temperature under the action of the micropump through the cooling liquid inlet and the cooling liquid outlet, and the high-efficiency cooling capacity of the cooling system is matched with the high-heat-conducting capacity of the high-heat-conducting material body, so that the temperature rise of the coil of the high-.

Compared with the prior art, the invention has the following advantages and effects: the stator winding of the main heating component of the permanent magnet motor is cooled through the high-heat-conducting material body, and heat generated by the stator winding when the permanent magnet motor normally operates is timely led out, so that the heat dissipation efficiency of the stator winding of the permanent magnet motor is greatly improved; meanwhile, the invention has simple structure, can obviously improve the uniformity of the temperature distribution of the motor, strengthens the heat dissipation capability of the stator winding of the high-speed permanent magnet motor and ensures the safe, efficient and stable operation of the permanent magnet motor.

Drawings

Fig. 1 is a schematic structural diagram of a system for enhancing cooling of a permanent magnet motor based on a high thermal conductive material in an embodiment of the invention.

Fig. 2 is a schematic diagram of an in-slot structure of a stator core in an embodiment of the present invention.

Fig. 3 is a schematic structural view of a cooling system in an embodiment of the present invention.

In the figure: the high-heat-conduction-material cooling structure comprises a stator winding 1, a high-heat-conduction-material heat exporting device 2, a cooling system 3, a stator iron core 4, a left bearing 5, a rotor shaft 6, a permanent magnet 7, a right bearing 8, a slot wedge 9, an adjusting gasket 10, a row-to-row vertical partition plate 11, a coil 12, an interlayer filler strip 13, a slot bottom gasket 14, a main insulating layer 15, a high-heat-conduction material body 16, a cooling liquid outlet 17, a cooling liquid inlet 18, a cooling cavity 19 and a high-heat-conduction-material cooling section 20.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.

Referring to fig. 1 to 3, the system for enhancing cooling of a permanent magnet motor based on a high thermal conductive material in the present embodiment includes a stator winding 1 and a stator core 4, wherein the stator winding 1 is wound on the stator core 4, and the stator winding 1 is supported in a groove of the stator core 4; the high-heat-conduction material heat conduction device comprises a high-heat-conduction material heat conduction device 2 and a cooling system 3, wherein one end of the high-heat-conduction material heat conduction device 2 is in contact with the stator winding 1, and the other end of the high-heat-conduction material heat conduction device 2 is connected with the cooling system 3; the cooling system 3 comprises a cooling cavity 19, a cooling liquid outlet 17 and a cooling liquid inlet 18 are arranged on the cooling cavity 19, a high-heat-conduction-material cooling section 20 is arranged in the cooling cavity 19, and the high-heat-conduction-material heat guiding device 2 is connected with the high-heat-conduction-material cooling section 20; the stator winding 1 comprises a coil 12, wherein two sides of the coil 12 are provided with a high heat conducting material body 16 in a contact mode, and the high heat conducting material heat exporting device 2 is connected with the high heat conducting material body 16.

In the embodiment, the stator winding 1 comprises two layers of spiral winding type coils 12, each coil 12 is composed of a plurality of small square copper wires, the coils 12 are processed by F-grade insulating materials and epoxy resin, an interlayer filler strip 13 is arranged between the upper layer coil 12 and the lower layer coil 12, the middle part of each coil 12 is provided with a row of vertical partition plates 11, and the outside of each coil 12 is wrapped with a main insulating layer 15; a groove bottom gasket 14 is arranged in a groove of the stator core 4, and a main insulating layer 15 at the upper end of the upper-layer coil 12 is in contact with the groove bottom gasket 14; the slot wedge 9 is connected to a main insulation layer 15 at the lower end of the lower coil 12 through a spacer 10.

In this embodiment, the cooling system 3 adopts a liquid cooling method, the cooling liquid mainly functions to cool the heat brought out by the high heat conduction material heat export device 2,

In this embodiment, although the cooling system 3 is also shown in the lower dotted line position of fig. 1, only one cooling system 3 is shown in the actual device, and the schematic diagram is shown to facilitate understanding that all the stator windings 1 are provided with the high thermal conductive material bodies 16 and conduct heat to the cooling system 3.

In this embodiment, the stator core 4 is formed by combining thin silicon steel sheets, two surfaces of each lamination are coated with insulating paint, and the stator winding 1 and the stator core 4 jointly form a permanent magnet motor stator.

In this embodiment, the rotor shaft 6 is fixed to the left bearing 5 and the right bearing 8, and the bearings are designed in consideration of the axial and radial running accuracy of the rotor. The permanent magnet 7 is arranged on the rotor shaft 6, a layer of interference-fit high-strength non-magnetic-conductive stainless steel sheath is additionally arranged on the outer surface of the permanent magnet 7, and the permanent magnet 7 generates a rotating magnetic field under the driving of the high-speed rotation of the rotor shaft 6.

In this embodiment, the high thermal conductive material body 16 is processed into a wire shape in the stator coil 12, the high thermal conductive material body 16 has the electrical and magnetic conductivity, and in order to prevent electric leakage, the heat conduction device 2 of high thermal conductive material needs to be insulated at both side ends of the stator winding 1 and at the portion led out to the cooling system 3.

In this embodiment, the surface of the cooling section 20 made of high thermal conductive material is processed into a ring rib structure to increase the contact area between the cooling section 20 made of high thermal conductive material and the cooling liquid and enhance the flow disturbance of the cooling liquid to enhance the cooling effect. In order to enhance the cooling capacity of the cooling system, the structure of the cooling section 20 of high thermal conductive material of the present invention can be designed into different structural forms, and the description of this embodiment is only one of the structural designs that can enhance the cooling, and the description of the other structural designs is omitted.

Specifically, the working method of the system for enhancing the cooling of the permanent magnet motor based on the high heat conduction material comprises the following steps: when the high-speed permanent magnet motor operates, heat loss is generated when current flows through a stator winding 1, through reasonable arrangement of a coil 12 and a high-heat-conducting material body 16, heat of the coil 12 is efficiently led out, the heat is led out to a high-heat-conducting material heat leading-out device 2 positioned on two sides of the stator winding 1 and then led out to a cooling system 3, a cooling section 20 of the high-heat-conducting material is cooled by the cooling system 3, the temperature in a cooling cavity 19 is controlled through a constant temperature device, under the action of a micro pump, constant temperature is ensured by a cooling liquid in the cooling system 3 through a cooling liquid inlet 18 and a cooling liquid outlet 17, and the high-efficiency cooling capacity of the cooling system 3 is matched with the high-efficiency heat-conducting capacity of the high-heat-conducting material body 16, so that the temperature rise of the coil 12 of the high.

Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.