Induction asynchronous motor for electric flat car

Abstract

The utility model relates to induction asynchronous motor for electric flat car, including motor body, oil cooling shower cooling system, rotor assembly and stator assembly, the motor body includes casing, front end cover and rear end cover, the oil cooling shower cooling system system includes oil cooling circulation module and shower cooling module, the oil cooling circulation module includes oil tank, oil pump, cooler and the spiral oil channel connected in the inner wall of casing, the shower cooling module includes shower ring pipe and electromagnetic three -way valve, and the shower ring pipe annularly arranges in stator assembly end portion, can make cooling oil directly cover rotor bar root and end ring high heat area through the utility model, solves rotor heat dissipation blind area problem, and the cooperation oil collecting groove realizes the closed -loop recovery of cooling oil, and the synergy with oil cooling shower cooling system, and rotor overall loss reduces, avoids the bar softening and dynamic balance invalidation due to high temperature.

Description

Technical Field

[0001] This utility model relates to the technical field of electric flatbed cart drive equipment, and in particular to an induction asynchronous motor for electric flatbed carts. Background Technology

[0002] As a core piece of heavy-duty transport equipment in the industrial field, the performance of the drive motor of a large electric flatcar directly determines the flatcar's traction, load capacity, and operating costs.

[0003] However, the existing motor cooling system only covers the stator area. Under heavy load and high frequency start-stop conditions, the rotor bars and end rings are prone to local high temperature due to eddy current loss and frictional heat generation, which leads to softening of the bars and failure of rotor dynamic balance, resulting in increased motor vibration and noise and reduced load-bearing capacity. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing an induction asynchronous motor for electric flatbed carts. The specific technical solution is as follows: The induction asynchronous motor for electric flatbed carts includes a motor body, an oil-cooled spray cooling system, a rotor assembly, and a stator assembly. The motor body includes a housing, a front cover, and a rear cover. The oil-cooled spray cooling system includes an oil-cooling circulation module and a spray cooling module. The oil-cooling circulation module includes an oil tank, an oil pump, a cooler, and a spiral oil channel connected to the inner wall of the housing. The spray cooling module includes a spray ring pipe and an electromagnetic three-way valve. The spray ring pipe is arranged in a ring at the end of the stator assembly, with multiple spray holes evenly opened at the bottom of the pipe to spray cooling oil onto the end of the stator assembly. The inlet end of the spray ring pipe is connected to the oil pump via a pipe, and the outlet end is connected to the cooler. The spiral oil channel allows the cooling oil to flow from the inlet along a spiral path, absorbing heat from the housing and stator assembly. After being cooled by the cooler, the oil flows back to the oil tank, forming a cooling cycle.

[0005] Preferably, the stator assembly includes a stator core and a flat wire winding, the flat wire winding being made of copper flat wire. The rotor assembly includes a rotor core, a shaft, and rotor bars. The outer circumference of the rotor core has multiple pear-shaped slots. One end of the shaft is fitted with a bearing and a frame oil seal, and the other end is fitted with a bearing and a shaft retaining ring. The middle part of the shaft is interference-fitted with the rotor core.

[0006] Preferably, it also includes a rotor targeted cooling section, which includes a U-shaped axial main oil passage, a radial branch oil passage, an oil passage sealing plug, a turbine guide impeller and an oil inlet cover. The U-shaped axial main oil passage is two U-shaped structures symmetrically machined along the axial direction in the middle of the inner side of the rotating shaft. The inlet end of the U-shaped axial main oil passage is located on the inner side of the rotating shaft near the second bearing, and the outlet end extends to the middle of the rotor core.

[0007] Preferably, the radial branch oil passages are a set of oil passages opened every 120° circumferentially during rotor core stacking, with a total of three sets. One end is connected to the U-shaped axial main oil passage, and the other end extends to the root of the rotor guide bar. The inner wall is coated with polytetrafluoroethylene. The oil-cooled sealing plug is made of copper alloy and is interference-fitted into the openings at both ends of the U-shaped axial main oil passage. The inlet sealing plug has an oil inlet hole in the center. The turbine guide vane is shaped like a centrifugal turbine and is connected to the shaft by a flat key. It is located inside the oil inlet cover. The oil inlet cover is fixed to the inner side of the rear end cover, with an oil inlet in the center and a spiral oil guide groove machined on the inner wall.

[0008] Preferably, it also includes an oil collection trough, which is an annular groove machined inside the rear end cover, with an oil return hole at the bottom of the trough, and the oil return hole is connected to the oil tank of the oil cooling system through a pipe.

[0009] Preferably, the oil pump of the oil cooling circulation module is a CB-B63, the cooler is a plate heat exchanger, the spray ring pipe is arranged in a ring at the end of the stator assembly, and the spray holes are opened at the bottom of the pipe; the electromagnetic three-way valve is a VFS4100.

[0010] Preferably, it also includes a plug-in encoder and a wave spring, the wave spring being mounted between the bearing and the front end cover.

[0011] Preferably, a number of heat dissipation fins are fixedly connected to the outer circumferential side of the housing, and the two ends of the motor body are connected to the front cover and the rear cover by bolts.

[0012] Preferably, it also includes a controller and a temperature sensing unit. The temperature sensing unit includes a temperature sensor one and a temperature sensor two. Temperature sensor one is used to monitor the temperature of the stator assembly in real time, and temperature sensor two is used to monitor the temperature of the rotor assembly. Temperature sensor one, temperature sensor two, electromagnetic three-way valve and oil pump are all connected to the controller.

[0013] The beneficial effects of this utility model are: 1. No blind spots in rotor heat dissipation, significantly reduced temperature: The rotor targeted cooling section, through the precise layout of the U-shaped axial main oil passage and radial branch oil passage, combined with the active oil suction design of the turbine guide impeller, allows the cooling oil to directly cover the root of the rotor guide bars and the high-heat area of ​​the end ring, solving the problem of blind spots in rotor heat dissipation; in conjunction with the oil collection tank, the cooling oil is recycled in a closed loop, working in synergy with the oil-cooled spray cooling system, reducing the overall rotor loss and avoiding guide bar softening and dynamic balance failure caused by high temperature.

[0014] 2. High-efficiency cooling oil circulation: The oil-cooled spray cooling system seamlessly connects the stator circulation path of "oil pump-spiral oil passage-cooler-oil tank" with the rotor circulation path of "oil inlet shroud-turbine guide impeller-rotor oil passage-oil collection tank-oil tank", ensuring no waste or leakage of cooling oil within the system; the adaptive switching function of the electromagnetic three-way valve allows the cooling oil to be distributed to the stator and rotor as needed, saving oil consumption and reducing annual maintenance costs compared to traditional open cooling systems. Attached Figure Description

[0015] Figure 1 This is a partial cross-sectional view of the present invention. Figure 2 This is a front view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the overall structure of this utility model from the left side. Figure 4 This is a schematic diagram of the overall structure of this utility model from the right side.

[0016] Reference numerals: 1. Housing; 2. Rear cover plate; 3. Lifting ring; 4. Temperature sensing unit; 10. Insert rod encoder; 11. Rotating shaft; 100. Heat dissipation fins; 110. U-shaped axial main oil passage; 12. Skeleton oil seal; 13. Wave spring; 14. Front cover; 15. Bearing 1; 16. Stator; 17. Rotor; 20. Spray ring pipe; 21. Bearing 2; 22. Oil inlet hood; 23. Turbine guide impeller; 24. Sheath. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] Example For electric flatbed carts using induction asynchronous motors, please refer to [reference needed]. Figures 1-4 It includes the motor body, oil-cooled spray cooling system, stator and rotor 17 assembly, rotor 17 targeted cooling section, intelligent monitoring and adjustment assembly and auxiliary stabilization assembly. Each component is connected in coordination along the power transmission and cooling circulation path. The motor body provides the installation foundation for each functional component, ensuring compact structure and stable operation, while also assisting in heat dissipation. The housing 1 is made of 6061-T6 aluminum alloy die casting in a cylindrical shape. Multiple heat dissipation fins 100 are evenly arranged on the outer circumference of the housing 1. The surface of the fins is anodized to improve thermal conductivity. The inner wall of the shell 1 is machined with spiral oil channels for oil cooling circulation; the front cover 14 and the rear cover are connected at both ends of the shell 1 by M12 bolts, and fluororubber sealing rings are installed at the flange connection to adapt to the humid and dusty environment of the workshop.

[0019] Both the front cover 14 and the rear cover are made of aluminum alloy. The front cover 14 has a bearing mounting hole in the center (for bearing 15), and a skeleton oil seal 12 is installed in the hole. The rear cover has a lifting ring 3 welded on the outside (for easy motor hoisting), and a bearing mounting hole (for bearing 21) and an oil collection groove installation position are opened on the inside. A shaft retaining ring is installed in the hole to prevent the bearing from moving axially.

[0020] The oil-cooled spray cooling system realizes the recycling of cooling oil and coordinated cooling of stator 16 and rotor 17. It includes an oil-cooled circulation module and a spray cooling module. The cooling oil (model L-TSA46 turbine oil) circulates in a closed loop within the system. The oil-cooled circulation module includes an oil tank for storing cooling oil. A liquid level sensor and an oil temperature sensor are installed in the tank to monitor the oil level and oil temperature in real time. An alarm is triggered when the oil level is lower than 1 / 3. The outer wall of the tank is covered with a thick polyurethane insulation layer.

[0021] The oil pump is fixed to the top of the oil tank via a flange; the oil pump inlet is connected to the oil outlet at the bottom of the oil tank, and the outlet is connected to the inlet of the spiral oil passage of the casing 1 via a stainless steel pipe to provide power for the circulation of cooling oil; the oil pump motor adopts frequency conversion control and the flow rate can be adjusted according to the temperature.

[0022] The cooler uses a plate heat exchanger (model M3-050), which is fixed next to the oil tank by a bracket; the inlet end of the cooler is connected to the outlet end of the spiral oil passage through a pipe, and the outlet end returns to the oil tank through a pipe; the cooler is connected to the workshop's industrial cooling water system, and through heat exchange between the plates, the temperature of the cooling oil is reduced from 85℃ to below 45℃.

[0023] The spiral oil channel is integrally machined with the inner wall of the housing 1. After the cooling oil flows in from the inlet end, it flows along the spiral path and adheres to the housing 1, fully absorbing the heat of the housing 1 and the iron core of stator 16. Then it flows into the cooler through the outlet end to cool down, forming a stator 16 cooling cycle of "oil tank → oil pump → spiral oil channel → cooler → oil tank", ensuring that the temperature of stator 16 is ≤150℃.

[0024] The spray cooling module has a spray ring pipe 20 fixed to the inside of the front cover 14 by an L-shaped bracket (adjustable height) and arranged in a ring at the end of the stator 16 assembly. Twelve spray holes (atomization angle 60°) are evenly opened around the bottom of the pipe to accurately spray cooling oil at the end of the stator 16 winding. The inlet end of the spray ring pipe 20 is connected to the outlet end of the electromagnetic three-way valve through a Φ pipe.

[0025] The electromagnetic three-way valve, model VFS4100, has its inlet end connected to the oil pump outlet end (in parallel to the spiral oil passage inlet) via a pipeline, and the other two outlet ends connected to the spray ring pipe 20 and the bypass pipe (return oil tank) respectively. The electromagnetic three-way valve is electrically connected to the controller and can switch the oil circuit according to the temperature signal to achieve dual-mode cooling of "oil cooling only" or "oil cooling + spray".

[0026] The cooling oil output from the cooling oil circulation logic pump is divided into two paths: the main path flows to the spiral oil channel to cool the stator 16 and the housing 1, and the branch path flows to the spray ring pipe 20 through the electromagnetic three-way valve. The cooling oil that has completed heat exchange (flowing out from the spiral oil channel on the stator 16 side and dripping from the end of the stator 16 on the spray side) all flow into the oil collection tank of the rear end cover, and then return to the oil tank through the oil return hole and pipeline, realizing recycling and eliminating oil waste.

[0027] The 17 stator and rotor components feature optimized electromagnetic structure and material selection, improving power density and efficiency. The stator 16 assembly includes the stator 16 core: it is made of 25K130 amorphous alloy strip rolled and stacked (stack factor 0.92), which reduces eddy current loss by 70% compared with traditional 35W250 silicon steel sheets; the outer circle of the core is interference-fitted with the inner wall of the shell 1 and assembled by hot fitting process (heating temperature 200℃) to ensure tight fit; 48 semi-closed pear-shaped slots are evenly opened on the inner circle of the core to reduce air gap magnetic conduction harmonics and reduce cogging torque.

[0028] Flat wire winding: Oxygen-free copper flat wire is used and embedded into the stator slot 16 through hairpin winding process; the winding adopts double-layer short-pitch winding (pitch 1-10) with an end height of 25mm to reduce end leakage magnetic field; the entire winding is treated with vacuum pressure impregnation (VPI) to improve oil resistance and high pressure resistance; the winding lead wire is connected to the external controller through the sheath 24, which is made of silicone rubber.

[0029] The rotor 17 assembly includes a rotor 17 core, which is made of high silicon steel sheets stacked together. The outer circle of the core has 44 pear-shaped grooves evenly opened. Aluminum conductors with a purity of 99.7% are cast in the grooves (cast at 720℃ using a low-pressure casting process). The ends are integrally formed with cast aluminum end rings. The contact resistance between the conductors and the end rings is ≤5mΩ, ensuring stable current transmission.

[0030] The shaft 11 is made of 42CrMo alloy steel, heat-treated to HRC28-32, and chrome-plated for wear and corrosion resistance. One end of the shaft 11 is fitted with bearing 15, oil seal 12, and front cover 14 in sequence, while the other end is fitted with bearing 21 (cylindrical roller bearing with retaining ring), shaft retaining ring, and rear cover. The middle of the shaft 11 is interference-fitted with the iron core of the rotor 17, and the mating surfaces are coated with anaerobic adhesive (Loctite 243) to enhance the connection strength and ensure that the torque transmission is slip-free.

[0031] The rotor 17 conductor bar is interference-fitted with the rotor 17 core slot. The conductor bar has a trapezoidal cross-section, which increases the conductive cross-sectional area and reduces copper loss. The root of the conductor bar is tightly fitted to the wall of the rotor 17 core slot, which reduces the air gap and improves the electromagnetic conversion efficiency.

[0032] The rotor 17 targeted cooling section is designed for high-heat areas such as the rotor 17 guide bars and end rings. It works in conjunction with the oil cooling circulation system to achieve precise cooling of the rotor 17. The U-shaped axial main oil passage 110 has two U-shaped oil passages symmetrically machined along the axial direction in the middle of the rotating shaft 11. The inlet end of the oil passage is located on the inner side of the rotating shaft 11 near the bearing 21, and the outlet end extends to the middle of the rotor 17 core. The inner wall of the oil passage adopts a precision honing process to reduce the flow resistance of the cooling oil. The inlet end of the oil passage is aligned with the oil inlet cover 22 to ensure efficient intake of cooling oil.

[0033] During the stacking process of the rotor 17 core, a set of radial branch oil channels is opened every 120° along the circumference of the core, with the length adapted to the radius of the rotor 17 core (extending from the outer circle of the shaft 11 to the root of the rotor 17 guide bar). The inner wall of the oil channel is sprayed with a thick polytetrafluoroethylene coating to prevent the edge of the silicon steel sheet from scratching the oil channel and to reduce the amount of cooling oil residue. One end of the radial branch oil channel is connected to the U-shaped axial main oil channel 110, and the other end is aligned with the root of the rotor 17 guide bar to ensure that the cooling oil directly contacts the guide bar for heat dissipation.

[0034] The oil passage sealing plug is made of copper alloy and is inserted into the U-shaped axial main oil passage 110 with openings at both ends. The inlet end sealing plug has an oil inlet hole in the center (cooling oil flows in one direction), and the outlet end sealing plug has no hole, ensuring that the cooling oil flows only along "inlet → U-shaped main oil passage → radial branch oil passage" without reverse leakage.

[0035] The turbine guide impeller 23 is made of fiberglass and is shaped like a centrifugal turbine (6 blades, blade angle 30°). It is connected to the side of the shaft 11 near the end ring by a flat key. An annular sealing lip is machined on one side of the impeller to prevent cooling oil from leaking from the gap between the impeller and the end cover. When the rotor 17 rotates, the impeller generates negative pressure and actively draws in cooling oil without the need for additional power.

[0036] The oil inlet cover 22 is fixed to the inside of the rear end cover by four M5 bolts. An oil inlet is opened in the center of the cover (connected to the bypass pipe of the oil cooling circulation system, and the flow direction is controlled by a one-way valve). The inner wall of the cover is machined with a spiral oil guide groove to guide the cooling oil to flow along the groove to the turbine guide impeller 23, so as to avoid the oil impact and the generation of bubbles.

[0037] An annular oil collection groove is machined on the inner side of the rear end cover, and oil return holes (a total of 4, evenly distributed) are opened along the axial direction at the bottom of the groove. The oil return holes are connected to the oil tank through stainless steel pipes to collect the cooling oil thrown out from the rotor 17. The inner wall of the oil collection groove is polished to reduce oil residue and ensure smooth oil return.

[0038] To monitor the motor status in real time, dynamically adjust the cooling mode, and avoid overload and malfunction, this application includes a temperature sensing unit 4, comprising a temperature sensor one and a temperature sensor two. Temperature sensor one is fixed to the end of the stator 16 winding via a high-temperature resistant cable to monitor the stator 16 temperature in real time. Temperature sensor two is embedded in a reserved hole on the outside of the rotor 17 end ring to monitor the rotor 17 temperature. The sensor signals are transmitted to the controller via a shielded wire.

[0039] The controller uses an STM32H743 microcontroller and is installed in the electrical control cabinet next to the motor. The controller communicates with the oil pump, solenoid three-way valve, and temperature sensor 4 via CAN bus to implement the following control logic: When the temperature of stator 16 is ≤120℃ and the temperature of rotor 17 is ≤130℃, only the oil cooling circulation module is activated (the electromagnetic three-way valve closes the spray branch). When the temperature of stator 16 is greater than 120℃ or the temperature of rotor 17 is greater than 130℃, the electromagnetic three-way valve switches to spray mode, and the cooling oil is simultaneously cooled through the spiral oil passage and the spray ring pipe 20, improving the heat dissipation efficiency by 40%. When the temperature of stator 16 exceeds 180℃ or the temperature of rotor 17 exceeds 160℃, the overload protection is triggered, the motor power supply is cut off, and an alarm is triggered.

[0040] The plug-in type encoder, model E6B2-CWZ6C, is connected to the rear end of the rotating shaft 11 via a coupling. The encoder provides real-time feedback of motor speed and direction signals to the controller, adapting to the frequent start-stop and speed adjustment requirements of the flatcar.

[0041] To reduce vibration, extend component life, and ensure long-term stable operation of the motor, this application includes a wave spring 13: made of 65Mn spring steel, installed between bearing 15 and front cover 14; the spring provides continuous preload, compensates for bearing wear clearance, prevents axial movement of the bearing, and extends bearing life.

[0042] The rotor 17 assembly (shaft 11 + rotor 17 core + guide bar + end ring) is dynamically balanced; after the stator 16 assembly is assembled with the housing 1, the whole assembly is statically balanced to ensure low vibration speed during motor operation.

[0043] Working principle: When the motor is running, the controller receives the flatcar drive command and outputs three-phase AC power to the stator 16 flat wire winding through the inverter to generate a rotating magnetic field; the rotor 17 conductor bar cuts the magnetic field to generate induced current, forming electromagnetic torque, which drives the rotating shaft 11 to rotate, and then drives the electric flatcar drive wheel through the coupling (if an extended reducer is used, it is connected through a spline).

[0044] 1. Under normal operating conditions (stator 16 ≤ 120℃, rotor 17 ≤ 130℃): The controller only activates the oil cooling circulation module. The oil pump delivers the cooling oil in the oil tank to the spiral oil passage of the housing 1. Along the spiral path, it absorbs the heat of the housing 1 and the iron core of stator 16. After being cooled by the cooler, it flows back to the oil tank. At the same time, the rotation of rotor 17 drives the turbine guide impeller 23 to generate negative pressure, which draws in cooling oil from the oil inlet shroud 22. The oil flows through the U-shaped axial main oil passage 110 and the radial branch oil passage to the root of the rotor 17 guide bar. After absorbing heat, it is thrown to the oil collection tank by centrifugal force and flows back to the oil tank through the oil return hole, thus realizing synchronous oil cooling of stator 16 and rotor 17.

[0045] 2. Heavy load / high temperature conditions (stator 16 > 120℃ or rotor 17 > 130℃): The temperature sensor 4 transmits the signal to the controller, the electromagnetic three-way valve switches to spray mode, and the cooling oil output by the oil pump is divided into two paths: one path continues to flow through the spiral oil passage, and the other path is atomized and sprayed to the end of the stator 16 winding through the spray ring pipe 20 to enhance the heat dissipation of the stator 16; the rotor 17 targeted cooling section continues to work, and the cooling oil flow rate increases with the increase of the rotor 17 speed (the negative pressure of the turbine guide impeller 23 is enhanced) to ensure that the rotor 17 temperature does not exceed 130℃; 3. Shutdown phase: After the motor stops, the cooling system shuts down after a 5-minute delay. The oil pump continues to deliver cooling oil to remove residual heat from the stator 16 and rotor 17. When the temperature drops below ambient temperature +20℃, the oil pump stops, the solenoid three-way valve resets, and the shutdown is completed.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An induction asynchronous motor for electric flatbed carts, characterized in that, The system includes a motor body, an oil-cooled spray cooling system, a rotor assembly, and a stator assembly. The motor body includes a housing, a front cover, and a rear cover. The oil-cooled spray cooling system includes an oil-cooling circulation module and a spray cooling module. The oil-cooling circulation module includes an oil tank, an oil pump, a cooler, and a spiral oil channel connected to the inner wall of the housing. The spray cooling module includes a spray ring pipe and a solenoid three-way valve. The spray ring pipe is arranged in a ring at the end of the stator assembly, with multiple spray holes evenly opened at the bottom of the pipe to spray cooling oil onto the end of the stator assembly. The inlet end of the spray ring pipe is connected to the oil pump via a pipe, and the outlet end is connected to the cooler. The spiral oil channel allows the cooling oil to flow from the inlet along a spiral path, absorbing heat from the housing and stator assembly. After being cooled by the cooler, the oil flows back to the oil tank, forming a cooling cycle.

2. The induction asynchronous motor for electric flatbed carts according to claim 1, characterized in that: The stator assembly includes a stator core and a flat wire winding. The flat wire winding uses copper flat wire. The rotor assembly includes a rotor core, a shaft, and rotor bars. The outer circumference of the rotor core has multiple pear-shaped slots. One end of the shaft is equipped with a bearing and a frame oil seal, and the other end is equipped with a bearing and a shaft retaining ring. The middle part of the shaft is interference-fitted with the rotor core.

3. The induction asynchronous motor for electric flatbed carts according to claim 2, characterized in that: It also includes a rotor targeted cooling section, which includes a U-shaped axial main oil passage, a radial branch oil passage, an oil passage sealing plug, a turbine guide impeller and an oil inlet cover. The U-shaped axial main oil passage consists of two U-shaped structures symmetrically machined along the axial direction in the middle of the inner side of the shaft. The inlet end of the U-shaped axial main oil passage is located on the inner side of the shaft near the second bearing, and the outlet end extends to the middle of the rotor core.

4. The induction asynchronous motor for electric flatbed carts according to claim 3, characterized in that: The radial branch oil passages are a set of oil passages opened every 120° circumferentially during rotor core stacking, with a total of three sets. One end is connected to the U-shaped axial main oil passage, and the other end extends to the root of the rotor guide bar. The inner wall is coated with polytetrafluoroethylene. The oil-cooled sealing plug is made of copper alloy and is interference-fitted into the openings at both ends of the U-shaped axial main oil passage. The inlet end sealing plug has an oil inlet hole in the center. The turbine guide vane is shaped like a centrifugal turbine and is connected to the shaft by a flat key. It is located inside the oil inlet cover. The oil inlet cover is fixed to the inner side of the rear end cover, with an oil inlet in the center and spiral oil guide grooves machined on the inner wall.

5. The induction asynchronous motor for electric flatbed carts according to claim 1, characterized in that: It also includes an oil collection tank, which is an annular groove machined inside the rear end cover. The bottom of the groove has an oil return hole, which is connected to the oil tank of the oil cooling system through a pipe.

6. The induction asynchronous motor for electric flatbed carts according to claim 1, characterized in that: The oil pump of the oil cooling circulation module is model CB-B63, the cooler is a plate heat exchanger, the spray ring pipe is arranged in a ring at the end of the stator assembly, and the spray holes are opened at the bottom of the pipe; the electromagnetic three-way valve is model VFS4100.

7. The induction asynchronous motor for electric flatbed carts according to claim 2, characterized in that: It also includes a plug-in encoder and a wave spring, which is mounted between the bearing and the front cover.

8. The induction asynchronous motor for electric flatbed carts according to claim 1, characterized in that: Several heat dissipation fins are fixedly connected to the outer circumference of the housing, and the two ends of the motor body are connected to the front cover and the rear cover by bolts.

9. The induction asynchronous motor for electric flatbed carts according to claim 1, characterized in that, It also includes a controller and a temperature sensing unit. The temperature sensing unit includes a temperature sensor one and a temperature sensor two. Temperature sensor one is used to monitor the temperature of the stator assembly in real time, and temperature sensor two is used to monitor the temperature of the rotor assembly. Temperature sensor one, temperature sensor two, electromagnetic three-way valve and oil pump are all connected to the controller.

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