Long-stator linear motor electromagnet

Abstract

The application belongs to the field of linear motors, and particularly relates to a long-stator linear motor electromagnet, which comprises an iron core, the iron core comprises a yoke part and a plurality of tooth parts arranged at equal intervals on the yoke part, and at least one cooling channel is arranged in the iron core, the cooling channel is arranged along the length direction of the yoke part and is arranged in a meandering manner towards the tooth part when passing through each tooth part. The application sets the cooling channel in the iron core, the cooling channel is arranged in a transverse direction of the yoke part of the iron core, and is arranged in a meandering manner towards the tooth part when passing through each tooth part, that is, the cooling channel is in a square wave shape as a whole. On the premise of not increasing the size of the iron core, the surface area of the cooling channel is ensured, more heat can be taken away after the cooling channel inputs cooling liquid, and the heat dissipation effect of the tooth part is greatly improved due to the meandering arrangement of the cooling channel when passing through each tooth part, the internal temperature of the coil installed on the tooth part can be greatly reduced, the current-carrying capacity of the coil is improved, and then the suspension capacity and the traction are improved.

Description

Technical Field

[0001] This invention belongs to the field of linear motors, specifically relating to an electromagnet for a long stator linear motor. Background Technology

[0002] Currently, ground transportation mainly relies on highways and railways. However, with societal development, their speed is increasingly lagging behind the times. Among these two major ground transportation systems, only the railway system can further improve transportation speed. Conventional wheel-rail systems, due to inherent adhesion and mechanical limitations, have significantly restricted their maximum speed. Maglev trains, for the first time in the history of ground transportation technology, achieve contactless, frictionless, and wear-free operation between the vehicle and the road surface, overcoming many drawbacks of traditional locomotives that require mechanical wheel-rail contact for train traction. Their maximum operating speed has reached over 500 km / h, and their vibration and noise are much lower than conventional wheel-rail systems; linear motor drive is one of their advantages. From an economic perspective, the investment per seat on a maglev train is half that of an airplane, while its speed is much faster than wheel-rail transportation, approaching that of airplanes, making it suitable for medium- and long-distance passenger transport. Therefore, maglev trains are considered the most ideal mode of transportation in the 21st century. The long stator linear motor electromagnet is one of the core components of high-speed maglev trains, determining the train's levitation and traction performance. Therefore, developing high-performance long stator linear motor electromagnets is key to improving train performance.

[0003] In a long stator linear motor, the electromagnet acts as both the mover and the levitation electromagnet, providing both the levitation magnetic field and the traction excitation magnetic field. As a result, the current load in the electromagnet excitation coil is relatively high. In addition, an integral potting structure is generally used to protect the coil. These factors lead to a higher coil temperature, which inhibits further improvement of levitation force and traction force. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a long stator linear motor electromagnet that can dissipate heat inside the iron core without affecting the overall size and structural strength.

[0005] The present invention includes an iron core, which includes a yoke and a plurality of teeth arranged at equal intervals on the yoke. At least one cooling channel is provided inside the iron core, which is arranged along the length of the yoke and meanders toward each tooth as it passes through it.

[0006] Furthermore, the yoke has a groove corresponding to each tooth.

[0007] Furthermore, the groove extends into the toothed portion along the yoke.

[0008] Furthermore, the cooling channel is arranged around the groove where it meanders.

[0009] Furthermore, heat dissipation fins are provided on the groove.

[0010] Furthermore, several heat dissipation fins are arranged parallel to each other along the width direction of the iron core.

[0011] Furthermore, the toothed portion has several heat dissipation grooves on the side opposite to the yoke.

[0012] Furthermore, a cooling pipe is provided inside the cooling channel.

[0013] Furthermore, thermally conductive adhesive is provided between the cooling pipe and the cooling channel.

[0014] Furthermore, the toothed portion includes end teeth at both ends and a standard tooth in the middle, the standard tooth being thicker than the end teeth.

[0015] The beneficial effects of this invention are as follows: By setting cooling channels inside the iron core, and having these channels extend laterally along the yoke of the iron core and meander towards each tooth, the cooling channels are generally square-wave shaped. This ensures the surface area of ​​the cooling channels without increasing the size of the iron core, allowing more heat to be carried away after coolant is introduced into the channels. Furthermore, the meandering design of the cooling channels as they pass through each tooth greatly improves the heat dissipation effect of the teeth, significantly reducing the internal temperature of the coils mounted on the teeth, increasing the current-carrying capacity of the coils, and thus improving levitation and traction. Compared to conventional air cooling or heat sinks that are attached to the outside of the iron core and coils, this invention effectively dissipates heat from the inside of the iron core and coils without occupying the space originally designed, facilitating coil installation. Cooling can be achieved in a smaller space without space constraints. In addition, the heat dissipation channels can be formed during the iron core production process, eliminating the need for additional assembly and reducing installation and maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a partial frontal sectional view of the present invention.

[0018] Figure 3 This is a partial cross-sectional view of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the present invention after the coil is installed.

[0020] Figure 5 This is a partial front sectional view of the present invention after the coil has been installed.

[0021] Figure 6 This is a partial cross-sectional view of the present invention after the coil has been installed.

[0022] In the diagram, 1-core; 11-tooth section; 111-end tooth section; 112-standard tooth section; 12-yoke section; 13-cooling channel; 14-groove; 15-heat dissipation fins; 16-heat dissipation slot; 2-cooling pipe; 3-coil. Detailed Implementation

[0023] The following detailed description of the invention will illustrate the general principles of the invention, examples of which are further illustrated in the accompanying drawings. In the drawings, similar reference numerals denote the same or functionally similar elements.

[0024] like Figure 1-6 As shown, the present invention includes an iron core 1, which includes a yoke 12 and a plurality of teeth 11 arranged at equal intervals on the yoke 12. At least one cooling channel 13 is provided in the iron core 1. The cooling channel 13 is arranged along the length of the yoke 12 and meanders toward each tooth 11 when passing through it. The cooling channel 13 has an arc-shaped transition at the bend where it meanders along the tooth 11, so as to avoid the loss of coolant flow pressure and stress concentration in the cooling channel 13, which would affect the overall structural strength.

[0025] The electromagnet of the long stator linear motor is one of the core components of high-speed maglev trains, determining the train's levitation and traction performance. Due to the limited battery capacity on maglev trains, the generated excitation magnetic field is also limited, restricting the potential for increasing the levitation force of the levitation poles. Patent "CN109802549A - An Excitation Magnetic Pole of a Synchronous Linear Motor for a High-Speed ​​Maglev Train" incorporates permanent magnets for auxiliary excitation in the levitation poles. This design provides both the motor's excitation magnetic field and the levitation magnetic field, thus increasing the burden on the excitation coil and causing severe heat generation. This invention addresses this by setting a cooling channel 13 within the core 1, extending laterally along the yoke 12 of the core 1 and meandering towards each tooth 11, forming a square wave shape. This ensures adequate cooling without increasing the size of the core 1. The surface area of ​​the cooling channel 13 allows it to carry away more heat after coolant is introduced into it. Furthermore, the meandering arrangement of the cooling channel 13 as it passes through each tooth 11 greatly enhances the heat dissipation effect of the tooth 11, significantly reducing the internal temperature of the coil 3 mounted on the tooth 11, increasing the current-carrying capacity of the coil 3, and consequently improving its levitation and traction. Compared to conventional air cooling or heat sinks that are attached to the outside of the core 1 and coil 3, this invention effectively dissipates heat from the inside of the core 1 and coil 3 without occupying the original design space, facilitating the installation of the coil 3. Cooling can be achieved in a smaller space without space constraints. Additionally, the cooling channel 13 can be formed during the core 1 production process, eliminating the need for additional assembly and reducing installation and maintenance costs.

[0026] The yoke 12 is provided with a groove 14 corresponding to each tooth 11, which can reduce the size and weight of the core 1, reduce material costs, and increase the surface area of ​​the core 1 to improve the heat dissipation area. Preferably, the groove 14 extends into the tooth 11 along the yoke 12. In this embodiment, the yoke 12 is divided into several parts. The multiple yokes 12 and teeth 11 make the core 1 as a whole also have a square wave shape. In addition, the cooling channel 13 is arranged around the groove 14 at its meandering part to avoid the arrangement of the cooling channel 13 from affecting the structural strength of the core 1.

[0027] The groove 14 is provided with heat dissipation fins 15, which further increases the heat dissipation area of ​​the core 1 without increasing the size of the core 1 or causing space constraints. Several heat dissipation fins 15 are arranged parallel to each other along the width of the core 1, which greatly increases the heat dissipation area and improves the heat dissipation efficiency. Preferably, the heat dissipation fins 15 are sheet-shaped and have several heat dissipation grooves on them, which greatly increases the heat dissipation area while reducing the overall weight.

[0028] The toothed portion 11 has several heat dissipation grooves 16 on the side away from the yoke portion 12. The heat dissipation grooves 16 are arranged parallel to each other at equal intervals, which reduces the weight and amount of iron core 1, reduces costs, and does not affect the structural strength of iron core 1. At the same time, it increases the surface area of ​​iron core 1. The heat dissipation fins 15 and heat dissipation grooves 16, together with air cooling or air cooling, greatly ensure the cooling effect on the outside of iron core 1.

[0029] The cooling channel 13 is equipped with a cooling pipe 2 to facilitate the flow of coolant, prevent the coolant from affecting the core 1, and facilitate the maintenance of the cooling structure and the resolution of blockage problems. The cooling pipe 2 is preferably made of copper, but other materials with good thermal conductivity can also be used.

[0030] Thermally conductive adhesive is provided between the cooling pipe 2 and the cooling channel 13 to ensure that the cooling pipe 2 can effectively remove heat.

[0031] The toothed portion 11 includes end teeth 111 at both ends and standard teeth 112 in the middle. The standard teeth 112 is thicker than the end teeth 111. In this embodiment, only the standard teeth 112 is provided with grooves 14 to ensure the structural strength of the core 1.

[0032] The invention has been described in detail with reference to specific embodiments thereof, and it will be apparent that various improvements and modifications may be made without departing from the concept of the invention as defined in the appended claims.

Claims

1. An electromagnet for a long stator linear motor, characterized in that, The core (1) includes a yoke (12) and a number of teeth (11) arranged at equal intervals on the yoke (12). The yoke (12) has a groove (14) corresponding to each tooth (11). The groove (14) extends into the tooth (11) along the yoke (12), so that the core (1) is square-wave shaped. The core (1) has at least one cooling channel (13) inside. The cooling channel (13) is arranged along the length of the yoke (12) and meanders toward the tooth (11) when passing through each tooth (11). The meandering part of the cooling channel (13) is arranged around the groove (14).

2. The electromagnet for a long stator linear motor as described in claim 1, characterized in that, The groove (14) is provided with heat dissipation fins (15).

3. The electromagnet for a long stator linear motor as described in claim 2, characterized in that, The heat dissipation fins (15) are arranged in parallel along the width direction of the iron core (1).

4. The electromagnet for a long stator linear motor as described in claim 1, characterized in that, The toothed part (11) has several heat dissipation grooves (16) on the side away from the yoke part (12).

5. The electromagnet for a long stator linear motor as described in claim 1, characterized in that, Cooling pipes (2) are installed inside the cooling channel (13).

6. The electromagnet for a long stator linear motor as described in claim 5, characterized in that, Thermally conductive adhesive is provided between the cooling pipe (2) and the cooling channel (13).

7. The electromagnet for a long stator linear motor as described in claim 1, characterized in that, The tooth (11) includes end teeth (111) at both ends and a standard tooth (112) in the middle, the standard tooth (112) being thicker than the end teeth (111).

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