Explosion-proof permanent magnet synchronous motor

Abstract

The invention discloses an explosion-proof permanent magnet synchronous motor, which comprises a motor assembly, which comprises a casing, a stator iron core, a rotor iron core, a rotating shaft, a front end cover, a rear end cover, a rotary transformer and a moisture-proof heating belt, and is characterized in that the moisture-proof heating belt is positioned in the casing and is arranged at the end part of a wiring winding of the stator iron core; the junction box comprises a box body, a switching support, an explosion-proof terminal integrated board and a box cover, the switching support is installed on the side face of the machine shell, the box body is connected with the switching support, the explosion-proof terminal integrated board is located in the box body and detachably installed on the switching support, and a high-voltage wire harness terminal and a low-voltage wire harness terminal are integrated on the explosion-proof terminal integrated board. Explosion-proof face joint faces are arranged at the installation connecting positions of the switching support and the box body and the installation connecting positions of the switching support and the explosion-proof terminal integrated board. A high-voltage leading-in device and a low-voltage leading-in device are arranged on the box body. The explosion-proof permanent magnet synchronous motor can solve the problems of large occupied space, high cost, complicated installation, insufficient protection and the like in the existing explosion-proof motor.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet synchronous motor technology, and more specifically to an explosion-proof permanent magnet synchronous motor. Background Technology

[0002] In recent years, with the rapid development of electric vehicle technology, domestic and foreign automobile companies have made electrification a key development direction. In my country, not only are passenger vehicles gradually undergoing electrification, but various engineering vehicles, especially traffic command vehicles and material transport vehicles used in special operating environments such as coal mines, are also actively promoting electrification. Explosion-proof permanent magnet synchronous motors, as the core power source for mining vehicles, have advantages such as strong power, low vibration, low noise, high energy efficiency, and stable operation, and have become the preferred drive device for mining electric vehicles.

[0003] Explosion-proof motors are designed with sufficient mechanical strength in their casing and appropriate explosion-proof joint surfaces to ensure that in the event of an internal flammable gas explosion caused by a malfunction, the explosion flames and high-temperature gases will not spread to the external environment, thus preventing the ignition of surrounding flammable gases. Furthermore, mining vehicles often operate in harsh environments such as dampness, dust, and even water wading, making the motor windings susceptible to moisture absorption, which can lead to a decrease in insulation resistance and, in severe cases, even winding burnout. Therefore, after a long period of inactivity or exposure to high humidity, the motor windings typically require drying to restore their insulation performance.

[0004] Currently, there are two main types of lead wire methods commonly used for explosion-proof motors: (1) Multi-terminal centralized introduction method: High-voltage power lines, resolver signal lines, temperature measuring lines, etc. are introduced into the same main junction box through multiple independent explosion-proof terminals. Although this method integrates into one junction box, there are many types of terminals, the structure is complex, the space is large, the manufacturing cost is high, the installation process is cumbersome, and the skill level of the operators is high.

[0005] (2) Multi-junction box distributed introduction method: The high-voltage wire harness and the low-voltage signal line are introduced into junction boxes in different locations, that is, high-voltage junction boxes and low-voltage junction boxes are set up. Although the electrical isolation is clear, this method increases the number of junction boxes, occupies more installation space, the wiring is complicated, the overall structure is not compact enough, and it is not conducive to the layout in mining vehicles with limited space.

[0006] In addition, the protection capabilities of existing explosion-proof motors in terms of moisture-proof, waterproof, and dust-proof properties still need to be improved. Especially in vehicles wading through water or in high-humidity environments, the inside of the motor is prone to moisture, which affects its insulation performance and operational reliability.

[0007] Therefore, existing technologies suffer from problems such as large space occupation, complex structure, high cost, inconvenient installation and maintenance, and insufficient protective performance. Summary of the Invention

[0008] In view of the shortcomings of the prior art, the present invention provides a safe, reliable, efficient and economical explosion-proof permanent magnet synchronous motor, which can solve the problems of large space occupation, high cost, complicated installation and insufficient protection of existing explosion-proof motors.

[0009] To achieve the above objectives, the present invention provides the following technical solution: An explosion-proof permanent magnet synchronous motor includes: The motor assembly includes a housing, a stator core, a rotor core, a shaft, a front cover, a rear cover, a rotary transformer, and a moisture-proof heating belt, wherein the moisture-proof heating belt is located inside the housing and installed at the end of the stator core winding. A junction box includes a box body, an adapter bracket, an explosion-proof terminal integrated plate, and a box cover. The adapter bracket is installed on the side of the housing, and the box body is connected to the adapter bracket. The explosion-proof terminal integrated plate is located inside the box body and is detachably installed on the adapter bracket. The explosion-proof terminal integrated plate integrates high-voltage wire harness terminals and low-voltage wire harness terminals. Explosion-proof mating surfaces are provided at the installation connection points between the adapter bracket, the box body, and the explosion-proof terminal integrated plate. The box body is provided with a high-voltage inlet device and a low-voltage inlet device for introducing high-voltage power lines and low-voltage signal lines, respectively. The box cover is installed on the box body.

[0010] Furthermore, the outer ring of the explosion-proof terminal integrated board is made of steel plate, and the inside is made of high-strength insulating material. The high-strength insulating material and the steel plate are injection molded into a single structure under high pressure.

[0011] Furthermore, both the high-voltage wiring harness terminal and the low-voltage wiring harness terminal include several copper rods, which are mounted on the explosion-proof terminal integrated plate and locked at both ends by locking nuts. An explosion-proof mating surface is provided between the several copper rods and the explosion-proof terminal integrated plate.

[0012] Furthermore, the adapter support is provided with three stop structures, which respectively contact and connect with the housing, the explosion-proof terminal integrated plate, and the box to form an explosion-proof mating surface.

[0013] Furthermore, the connections between the adapter bracket, housing, explosion-proof terminal integrated board, box body and box cover are all bolted.

[0014] It further includes a water-slinging ring and a skeleton oil seal. The skeleton oil seal is installed inside the front cover and forms a seal with the rotating shaft. The water-slinging ring is installed on the rotating shaft and located outside the front cover. The water-slinging ring and the front cover are fitted with a clearance. When the rotating shaft rotates, the water-slinging ring rotates coaxially with the rotating shaft and achieves relative motion with the stationary front cover to form a labyrinth seal.

[0015] Furthermore, an explosion-proof surface for the motor is provided at the connection between the housing and the front and rear covers, and a sealing ring is provided at the explosion-proof surface for the motor.

[0016] Furthermore, a planar mating surface is provided at the connection between the box body and the box lid.

[0017] Furthermore, the box cover is provided with several bolt mounting holes, and anti-collision protective rings are provided at the bolt mounting holes. The surface of the box cover is provided with an Ex explosion-proof mark.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. High integration and space optimization: The high-voltage power harness and low-voltage signal harness (such as rotary transformer and temperature measurement signal) are integrated into a single junction box by explosion-proof terminal integration board, which replaces the traditional multi-terminal or multi-junction box design, significantly reducing the space occupied and the number of components. This reduces material costs and installation complexity, and is especially suitable for mining vehicles with limited space.

[0019] 2. Excellent explosion-proof performance and safety: Multiple explosion-proof mating surfaces (such as the adapter support stop, motor explosion-proof surface, and terminal explosion-proof mating surface) meet explosion-proof standards, ensuring that internal explosions will not ignite the external environment. Combined with sealing rings and labyrinth sealing mechanisms, the overall protection level is high, making it suitable for flammable and explosive locations (such as coal mines).

[0020] 3. Enhanced environmental adaptability: The moisture-proof heating belt can actively dry the windings and prevent the insulation resistance from decreasing; the double seal of the water-slinging ring and the skeleton oil seal effectively resists moisture, dust and liquid intrusion, improving the reliability and life of the motor under harsh operating conditions (such as water immersion and high humidity).

[0021] 4. Convenient installation and maintenance: Modular design (such as detachable explosion-proof terminal integrated plate and bolt connection) makes assembly, debugging and maintenance easier; the junction box can rotate 360 ​​degrees to output wires, adapt to different wiring needs, and reduce on-site installation time and skill requirements.

[0022] 5. Standardization and Compliance: Standard explosion-proof components (such as A3 and A1 flared straight sections) are used and marked with the Ex explosion-proof mark to ensure that the products comply with domestic and international explosion-proof regulations, facilitating market promotion and application.

[0023] 6. Improved economy and efficiency: Integrated design reduces the number of parts and assembly steps, lowering production costs; detailed designs such as anti-collision guards extend product lifespan, reduce maintenance frequency, and improve overall equipment operating efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of an explosion-proof permanent magnet synchronous motor. Figure 2 This is a cross-sectional view of an explosion-proof permanent magnet synchronous motor; Figure 3 This is a schematic diagram of the junction box structure; Figure 4 for Figure 3 Sectional view of AA; Figure 5 Schematic diagram of the explosion-proof terminal integrated board Figure 1 ; Figure 6 for Figure 5 Sectional view of BB; Figure 7 Schematic diagram of the explosion-proof terminal integrated board Figure 2 .

[0025] The markings in the diagram are as follows: 1. Adapter support; 2. Explosion-proof terminal integrated board; 3. Box body; 4. Box cover; 5. High-voltage inlet device; 6. Low-voltage inlet device; 7. Bolt; 8. Shaft; 9. Water-slinging ring; 10. Front cover plate; 11. Front cover; 12. Housing; 13. Stator core; 14. Rotor core; 15. Bearing; 16. Sealing ring; 17. Rotary transformer cover plate; 18. Rotary transformer; 19. Moisture-proof heating belt; 20. Frame oil seal; 21. Rear cover; 22. Explosion-proof mating surface; 23. Explosion-proof mating surface; 24. Planar mating surface; 25. Copper rod; 26. Locking nut. Detailed Implementation

[0026] In the description of this invention, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this invention, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0028] An explosion-proof permanent magnet synchronous motor includes: The motor assembly includes a housing 12, a stator core 13, a rotor core 14, a shaft 8, a front cover 11, a rear cover 21, a rotary transformer 18, and a moisture-proof heating belt 19, wherein the moisture-proof heating belt 19 is located inside the housing 12 and installed at the end of the winding of the stator core 13. The junction box includes a box body 3, an adapter support 1, an explosion-proof terminal integrated plate 2, and a box cover 4. The adapter support 1 is installed on the side of the housing 12. The box body 3 is connected to the adapter support 1. The explosion-proof terminal integrated plate 2 is located inside the box body 3 and is detachably installed on the adapter support 1. The explosion-proof terminal integrated plate 2 integrates high-voltage wire harness terminals and low-voltage wire harness terminals. Explosion-proof mating surfaces 22 are provided at the installation and connection points of the adapter support 1, the box body 3, and the explosion-proof terminal integrated plate 2. The box body 3 is provided with a high-voltage inlet device 5 and a low-voltage inlet device 6, which are used to introduce high-voltage power lines and low-voltage signal lines, respectively. The box cover 4 is installed on the box body 3.

[0029] Preferably, the outer ring of the explosion-proof terminal integrated board 2 is made of steel plate material, the inside is made of high-strength insulating material, and the high-strength insulating material and steel plate material are injection molded into an integral structure by high pressure; Specifically, the explosion-proof terminal integrated board 2 adopts an outer steel plate and an inner high-strength insulating material through high-pressure injection molding to form an integral structure. The steel plate provides mechanical strength and rigidity of the explosion-proof shell, while the insulating material ensures electrical isolation and insulation performance. The injection molding process makes the two tightly bonded to form a stable explosion-proof barrier. The integrated design avoids loosening or gaps that may occur in traditional assembly, improving explosion-proof reliability and mechanical durability; at the same time, it simplifies the production process, reduces costs, and adapts to the integration requirements of high and low voltage wire harness terminals.

[0030] Preferably, both the high-voltage wiring harness terminal and the low-voltage wiring harness terminal include a plurality of copper rods 25, which are installed on the explosion-proof terminal integrated plate 2 and locked at both ends by locking nuts 26. An explosion-proof mating surface 23 is provided between the plurality of copper rods 25 and the explosion-proof terminal integrated plate 2. Specifically, the terminal is composed of multiple copper rods 25, which are fixed to the explosion-proof terminal integrated plate 2 by locking nuts 26. There is an explosion-proof mating surface 23 (such as a precision gap) between the copper rods 25 and the integrated plate. This design uses the explosion-proof principle to ensure that the flame will not spread through the gap when an internal explosion occurs. It provides reliable electrical connection and explosion-proof protection; the locking nut 26 facilitates installation and maintenance, and the explosion-proof mating surface 23 meets explosion-proof standards, enhancing safety; the integrated layout reduces the size of the junction box and simplifies wiring.

[0031] Preferably, the adapter support 1 is provided with three stop structures, which respectively contact and connect with the housing 12, the explosion-proof terminal integrated plate 2, and the box body 3 to form an explosion-proof surface mating surface 22. Specifically, the adapter support 1 is designed with three stops (which mate with the housing 12, the explosion-proof terminal integrated plate 2, and the box 3). Each stop forms a precise explosion-proof mating surface 22. The stop structure is machined to ensure that the mating gap is less than the explosion-proof requirement value to prevent the spread of explosion. It achieves seamless explosion-proof connection between multiple components, improving the overall explosion-proof performance; the modular design facilitates assembly and disassembly, reduces installation errors, and is suitable for different models of motors and junction boxes.

[0032] Preferably, the adapter support 1, housing 12, explosion-proof terminal integrated plate 2, box body 3 and box cover 4 are all connected to each other by bolts 7; Specifically, all key components (such as adapter support 1, housing 12, box 3, etc.) are fixed by bolts 7. Bolts 7 provide uniform clamping force to ensure that the explosion-proof surface mating surface 22 fits tightly. The connections are robust and reliable, easy to maintain and replace; standardized bolt connections reduce production costs and assembly complexity, and improve product consistency.

[0033] Preferably, the front cover 11 and the rotating shaft 8 form an explosion-proof mating surface through a radial clearance fit, and the front cover 11 and the housing 12 form an explosion-proof mating surface through a stop fit. The two parts together form an explosion-proof structure for the motor shaft extension end.

[0034] Preferably, it also includes a water-slinging ring 9 and a skeleton oil seal 20. The skeleton oil seal 20 is installed inside the front end cover 11 and forms a seal with the rotating shaft 8. The water-slinging ring 9 is installed on the rotating shaft 8 and located outside the front end cover 11. The water-slinging ring 9 and the front end cover 11 are in clearance fit. When the rotating shaft 8 rotates, the water-slinging ring 9 rotates coaxially with the rotating shaft 8 and achieves relative motion with the stationary front end cover 11 to form a labyrinth seal. Specifically, the skeleton oil seal 20 is installed inside the front cover 11 to form a static seal with the rotating shaft 8; the water-slinging ring 9 is installed on the rotating shaft 8 and is fitted with the front cover 11 with a clearance. When the rotating shaft 8 rotates, the water-slinging ring 9 rotates to form a labyrinth seal, and the liquid and dust are thrown out by centrifugal force. The double sealing mechanism significantly improves the motor's protection level (such as IP54 or higher), preventing moisture and dust from entering the motor; it is suitable for humid and dusty environments (such as water-crossing conditions in mining vehicles), extending the motor's lifespan.

[0035] Preferably, a motor explosion-proof surface is provided at the connection between the housing 12 and the front cover 11 and the rear cover 21, and a sealing ring 16 is provided at the motor explosion-proof surface. Specifically, an explosion-proof surface (such as a stop fit) is provided at the connection between the housing 12 and the front cover 11 and the rear cover 21, and a sealing ring 16 is installed. The explosion-proof surface is explosion-proof through a precision gap, and the sealing ring 16 provides an additional seal to prevent gas and liquid penetration. The overall explosion-proof performance and protection capability of the motor are enhanced; the sealing ring 16 compensates for machining tolerances, ensuring that the seal remains intact under vibration or temperature changes, thus improving reliability.

[0036] Preferably, a planar mating surface 24 is provided at the connection between the box body 3 and the box cover 4. Specifically, the box body 3 and the box cover 4 are connected through the planar mating surface 24. The mating surface is precision machined to ensure flatness, and is tightened by bolts 7 to form an explosion-proof seal. This simplifies the processing technology and reduces costs. The planar mating surface 24 is easy to maintain and inspect, ensuring the explosion-proof integrity of the junction box.

[0037] Preferably, the cover 4 is provided with a plurality of bolt mounting holes, and anti-collision protective rings are provided at the bolt mounting holes, and the surface of the cover 4 is provided with an Ex explosion-proof mark; Specifically, anti-collision guards (such as metal guards) are installed at the bolt mounting holes to protect the bolts 7 from external impacts; the Ex explosion-proof mark is marked on the surface of the box cover 4 to indicate that the product complies with explosion-proof standards; The anti-collision ring prevents damage to the explosion-proof surface caused by accidental collisions, thus improving safety; the Ex marking facilitates user identification and compliant use, enhancing market competitiveness.

[0038] Preferably, the high-voltage wiring harness terminals and the low-voltage wiring harness terminals adopt A3 flared straight-through joints and A1 flared straight-through joints, respectively. Both A3 and A1 flared straight-through joints are existing standard parts that can be directly purchased and used, and are connected to the housing 3 by welding. The A3 flared straight-through joint serves as a high-voltage three-phase line introduction device, and the A1 flared straight-through joint serves as a low-voltage wiring harness introduction device such as resolver signal leads and temperature measurement signal lines.

[0039] Preferably, the front cover 11 is further provided with a bearing mounting cavity and a front cover plate 10. A rotating bearing 15 is provided in the bearing mounting cavity. The rotating bearing 15 is in contact with the rotating shaft 8. The front cover plate 10 is installed at the opening of the bearing mounting cavity.

[0040] advantage: 1. High integration and space optimization: The explosion-proof terminal integration board 2 integrates high-voltage power harnesses and low-voltage signal harnesses (such as rotary transformer 18 and temperature measurement signals) into a single junction box, replacing the traditional multi-terminal or multi-junction box design. This significantly reduces the space occupied and the number of components, which reduces material costs and installation complexity, and is particularly suitable for mining vehicles with limited space.

[0041] 2. Excellent explosion-proof performance and safety: Multiple explosion-proof mating surfaces 22 (such as the stop of the adapter support 1, the explosion-proof surface of the motor, and the explosion-proof mating surface of the terminal 23) all meet the explosion-proof standards, ensuring that internal explosions will not ignite the external environment. Combined with the sealing ring 16 and the labyrinth sealing mechanism, the overall protection level is high and it is suitable for flammable and explosive places (such as coal mines).

[0042] 3. Enhanced environmental adaptability: The moisture-proof heating belt 19 can actively dry the windings and prevent the insulation resistance from decreasing; the double seal of the water-slinging ring 9 and the skeleton oil seal 20 effectively resists moisture, dust and liquid intrusion, improving the reliability and life of the motor under harsh operating conditions (such as water immersion and high humidity).

[0043] 4. Convenient installation and maintenance: Modular design (such as detachable explosion-proof terminal integrated plate 2 and bolt 7 connection) makes assembly, debugging and maintenance easier; the junction box can rotate 360 ​​degrees to output wires, adapt to different wiring needs, and reduce on-site installation time and skill requirements.

[0044] 5. Standardization and Compliance: Standard explosion-proof components (such as A3 and A1 flared straight sections) are used and marked with the Ex explosion-proof mark to ensure that the products comply with domestic and international explosion-proof regulations, facilitating market promotion and application.

[0045] 6. Improved economy and efficiency: Integrated design reduces the number of parts and assembly steps, lowering production costs; detailed designs such as anti-collision guards extend product lifespan, reduce maintenance frequency, and improve overall equipment operating efficiency.

[0046] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An explosion-proof permanent magnet synchronous motor, characterized in that, include: The motor assembly includes a housing, a stator core, a rotor core, a shaft, a front cover, a rear cover, a rotary transformer, and a moisture-proof heating belt, wherein the moisture-proof heating belt is located inside the housing and installed at the end of the stator core winding. A junction box includes a box body, an adapter bracket, an explosion-proof terminal integrated plate, and a box cover. The adapter bracket is installed on the side of the housing, and the box body is connected to the adapter bracket. The explosion-proof terminal integrated plate is located inside the box body and is detachably installed on the adapter bracket. The explosion-proof terminal integrated plate integrates high-voltage wire harness terminals and low-voltage wire harness terminals. Explosion-proof mating surfaces are provided at the installation connection points between the adapter bracket, the box body, and the explosion-proof terminal integrated plate. The box body is provided with a high-voltage inlet device and a low-voltage inlet device for introducing high-voltage power lines and low-voltage signal lines, respectively. The box cover is installed on the box body.

2. The explosion-proof permanent magnet synchronous motor according to claim 1, characterized in that: The outer ring of the explosion-proof terminal integrated board is made of steel plate, and the inside is made of high-strength insulating material. The high-strength insulating material and the steel plate are injection molded into a single structure under high pressure.

3. The explosion-proof permanent magnet synchronous motor according to claim 1, characterized in that: Both the high-voltage wiring harness terminal and the low-voltage wiring harness terminal include several copper rods. The copper rods are installed on the explosion-proof terminal integrated plate and both ends are locked with lock nuts. An explosion-proof mating surface is provided between the copper rods and the explosion-proof terminal integrated plate.

4. The explosion-proof permanent magnet synchronous motor according to claim 1, characterized in that: The adapter support is provided with three stop structures, which respectively contact and connect with the housing, the explosion-proof terminal integrated plate, and the box to form an explosion-proof mating surface.

5. The explosion-proof permanent magnet synchronous motor according to claim 1, characterized in that: The adapter support, housing, explosion-proof terminal integrated board, box body and box cover are all connected by bolts.

6. The explosion-proof permanent magnet synchronous motor according to claim 1, characterized in that: It also includes a water-slinging ring and a skeleton oil seal. The skeleton oil seal is installed inside the front cover and forms a seal with the rotating shaft. The water-slinging ring is installed on the rotating shaft and located outside the front cover. The water-slinging ring and the front cover are fitted with a clearance. When the rotating shaft rotates, the water-slinging ring rotates coaxially with the rotating shaft and achieves relative motion with the stationary front cover to form a labyrinth seal.

7. The explosion-proof permanent magnet synchronous motor according to claim 1, characterized in that: The connection between the housing and the front and rear covers is provided with a motor explosion-proof surface, and a sealing ring is provided at the motor explosion-proof surface.

8. The explosion-proof permanent magnet synchronous motor according to claim 1, characterized in that: The connection between the box body and the box lid is provided with a planar mating surface.

9. The explosion-proof permanent magnet synchronous motor according to claim 1, characterized in that: The box cover is provided with several bolt mounting holes, and anti-collision protective rings are provided at the bolt mounting holes. The surface of the box cover is provided with an Ex explosion-proof mark.

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