High-altitude working platform vehicle permanent magnet synchronous motor

Abstract

The utility model discloses a high -altitude operation platform car permanent magnet synchronous motor, including the casing and end cover, the casing inside is provided with rotor and stator, and the casing outer circle evenly is provided with the inclined heat dissipation rib, the inside of end cover is provided with annular heat dissipation cavity, the annular heat dissipation cavity is filled with heat -conducting silica gel, and the end cover outer surface is provided with radial fin, the stator includes the core no.

Description

Technical Field

[0001] This utility model belongs to the field of permanent magnet synchronous motor technology, and in particular relates to a permanent magnet synchronous motor for aerial work platform vehicles. Background Technology

[0002] As the core equipment for outdoor high-altitude operations, aerial work platforms place extremely high demands on the reliability, weather resistance, and long lifespan of their motors. The motors must frequently adapt to dynamic load changes such as lifting and rotation, and operate for extended periods in complex outdoor environments characterized by dust, strong vibration, and fluctuating temperatures (high temperatures in summer and low temperatures in winter). Currently, permanent magnet synchronous motors, due to their advantages of high efficiency, energy saving, and high power density, have gradually replaced traditional asynchronous motors as the mainstream drive component for aerial work platforms.

[0003] Existing permanent magnet synchronous motors tend to accumulate heat between the windings and permanent magnets during operation, leading to magnet demagnetization, winding insulation aging, and reduced motor lifespan. To address this, we propose a permanent magnet synchronous motor for aerial work platform vehicles. Utility Model Content

[0004] This utility model addresses the problems in the prior art by proposing the following technical solution: A permanent magnet synchronous motor for aerial work platform vehicles includes a housing and an end cover. The housing contains a rotor and a stator, and inclined heat dissipation fins are evenly distributed around the outer circumference of the housing. An annular heat dissipation cavity is opened on the inner side of the end cover, and the annular heat dissipation cavity is filled with thermally conductive silicone. Radial heat dissipation fins are provided on the outer surface of the end cover. The stator includes an iron core, which has axial ventilation holes that are evenly distributed along the circumference of the iron core.

[0005] As a preferred embodiment of the above technical solution, the angle between the heat dissipation fin and the axis of the casing is 30°-45°, and the spacing between adjacent heat dissipation fins is 15mm-20mm.

[0006] As a preferred embodiment of the above technical solution, the outer surface of the end cap is provided with radial heat sinks, the thickness of which is 2mm-3mm.

[0007] As a preferred embodiment of the above technical solution, the number of ventilation holes is 6-8, and the hole diameter is 8mm-10mm.

[0008] As a preferred embodiment of the above technical solution, the rotor includes: Iron core two: A U-shaped magnetic steel groove is opened on the outer circumference of iron core two, and positioning bosses are set on the inner walls of both sides of the magnetic steel groove, with a boss height of 2mm-3mm; The magnet is made of neodymium iron boron and is embedded in the magnet groove, engaging with the positioning boss. The gap between the magnet and the groove wall is filled with high-temperature resistant epoxy adhesive.

[0009] The beneficial effects of this utility model are as follows: 1. This utility model improves the heat dissipation efficiency of the motor by 20%-30% through the synergistic effect of inclined heat dissipation fins, annular heat dissipation cavity and axial ventilation holes, and can control the motor operating temperature below 120℃, effectively avoiding demagnetization of the magnets; 2. The dual fixing of the positioning boss and high-temperature resistant adhesive in this utility model reduces the risk of magnet detachment by more than 90%, and the magnetic retaining ring further improves the reliability of the rotor. Attached Figure Description

[0010] Figure 1 The diagram shown is a structural schematic of the permanent magnet synchronous motor used in the aerial work platform vehicle in this embodiment. Figure 2 The diagram shown is a structural schematic of the casing in the embodiment.

[0011] Explanation of reference numerals in the attached figures: 10. Housing; 101. Heat dissipation fins; 11. End cap; 111. Heat dissipation cavity; 112. Thermal conductive silicone; 12. Rotor; 13. Stator. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0013] Example like Figure 1 and Figure 2 As shown, the permanent magnet synchronous motor for aerial work platform vehicles includes a housing 10 and an end cover 11. The housing 10 is equipped with a rotor 12 and a stator 13. Inclined heat dissipation fins 101 are evenly distributed on the outer circumference of the housing 10. An annular heat dissipation cavity 111 is opened on the inner side of the end cover 11. The annular heat dissipation cavity 111 is filled with thermally conductive silicone 112. Radial heat dissipation fins are provided on the outer surface of the end cover 11. The stator 13 includes an iron core. The iron core has axial ventilation holes that are evenly distributed along the circumference of the iron core.

[0014] Specifically, compared with the traditional straight heat dissipation fins, the inclined structure of the inclined heat dissipation fins 101 can actively guide the air to flow along the inclined surface of the heat dissipation fins 101 when the motor is running or the external airflow is flowing, so as to avoid the airflow from stagnating between the heat dissipation fins 101. At the same time, the evenly distributed design maximizes the heat dissipation area of ​​the outer circumference of the housing, which can quickly transfer the heat inside the housing to the air, reduce the heat accumulation inside the housing 10, and alleviate the impact of the high temperature inside the housing 10 on the windings and magnets.

[0015] Thermally conductive silicone 112 has excellent thermal conductivity, with a thermal conductivity coefficient much higher than that of metal and air. It can fit tightly against the inner wall of the end cover 11, quickly conducting the heat from the stator 13 and rotor 12 ends in contact with the inner side of the end cover 11 to the annular heat dissipation cavity 111. The cavity structure of the heat dissipation cavity 111 can expand the volume of the "intermediate carrier" for heat conduction, avoiding local heat accumulation in the end cover 11. The heat is then transferred to the external heat sink through the end cover 11 body, forming a closed loop of "internal heat absorption - intermediate conduction - external heat dissipation" for the end cover 11 heat dissipation.

[0016] The radial heat sink design can evenly distribute the heat transferred by the end cover 11 from the center to the surrounding area, greatly increasing the contact area between the outer surface of the end cover 11 and the air. Compared with the end cover 11 without heat sink, the heat dissipation area can be increased by 30%-50%, accelerating the radiation and convection of heat to the surrounding environment, avoiding the end cover 11 from overheating due to heat accumulation, and thus protecting the stability of the connection between the end cover 11 and the housing 10 and the rotor 12.

[0017] The ventilation holes are evenly distributed along the circumference, forming an axial airflow channel. When the motor is working, the heat generated by the stator 13 winding and iron core will heat the internal air. The hot air can be discharged axially through the ventilation holes, while external cold air can be supplemented from the ventilation holes at the other end, forming "active convection heat dissipation". This directly removes the heat from the core heating area of ​​the stator 13 winding and iron core, effectively solving the problem of heat accumulation in the stator 13 and slowing down the aging rate of the winding insulation.

[0018] like Figure 1 and Figure 2 As shown, the angle between the heat dissipation fin 101 and the axis of the casing 10 is 30°-45°, and the spacing between adjacent heat dissipation fins 101 is 15mm-20mm.

[0019] Specifically, when the angle is less than 30°, the slope of the heat dissipation fin 101 is too gentle, and the "guiding" of the airflow along the slope is weakened, making it easy for airflow to stagnate; when the angle is greater than 45°, the "airflow channel" between the heat dissipation fins 101 becomes narrower, and the airflow resistance increases, which in turn reduces the convection efficiency; 30°-45° can maximize the contact area between the heat dissipation fin 101 and the air, and guide the airflow smoothly through the gaps between the heat dissipation fins 101, improving the convection heat dissipation efficiency by about 15%-20%, while avoiding the structural strength of the heat dissipation fin 101 to decrease due to the excessive angle, and preventing the heat dissipation fin 101 from breaking when the aerial work platform vehicle bumps.

[0020] A spacing of less than 15mm between the heat dissipation fins 101 will result in narrow airflow space between them, obstructed airflow exchange, and even a "hot air envelopment" phenomenon. A spacing of more than 20mm will reduce the total number of heat dissipation fins 101 on the outer circumference of the casing 10, resulting in a significant reduction in heat dissipation area. A spacing of 15mm-20mm can ensure sufficient airflow space between adjacent heat dissipation fins 101, while ensuring the number of heat dissipation fins 101 per unit length of casing 10, approximately 5-7 fins / 100mm casing length, balancing "airflow" and "heat dissipation area", avoiding material waste while maximizing heat dissipation efficiency.

[0021] like Figure 2 As shown, radial heat sinks are provided on the outer surface of the end cap 11, with a thickness of 2mm-3mm.

[0022] It should be noted that when aerial work platform vehicles are operating outdoors, the motor may be subjected to bumps, vibrations, or minor collisions. If the thickness of the heat sink is less than 2mm, it may deform or break due to insufficient structural strength, thereby damaging the heat dissipation structure. A thickness of 2mm-3mm can ensure that the heat sink is not easily damaged when subjected to normal vibrations and minor impacts, ensuring the long-term stability of the heat dissipation structure.

[0023] The heat transfer efficiency of a heat sink shows a "first increase, then decrease" trend with its thickness. When the thickness is less than 2mm, the heat sink's own heat capacity is small and it cannot quickly receive the heat transferred by the end cover 11. When the thickness is greater than 3mm, the internal thermal resistance of the heat sink will increase, and the distance for heat to be transferred from the root of the heat sink to the surface will be too long, causing heat to accumulate inside the heat sink and reducing the heat dissipation efficiency. A thickness of 2mm-3mm allows heat to be quickly transferred from the root of the heat sink to the surface with minimal thermal resistance, while ensuring the heat capacity of the heat sink, matching the heat output rate of the end cover 11, and preventing the heat sink from "overheating and failing".

[0024] like Figure 1 As shown, the number of ventilation holes should be 6-8. If the number is less than 6, there are too few ventilation channels inside the stator 13, resulting in insufficient ventilation and an inability to effectively remove heat from the windings and core, easily leading to excessively high local temperatures in the stator 13. If the number is greater than 8, it will significantly weaken the structural strength of the stator 13 core. Too many ventilation holes will reduce the effective magnetic permeability area of ​​the core and may also affect the winding space of the stator 13 windings, reducing the motor's output torque. A number of 6-8 holes can provide sufficient ventilation channels while ensuring the structural strength of the core, ensuring an internal ventilation volume of approximately 0.2-0.3 m³. 3 / min, effectively reducing the temperature of stator 13 winding by 8-12℃. When the aperture is less than 8mm, the ventilation holes are easily blocked by dust and winding insulation debris inside the motor, causing the ventilation channel to fail and lose its heat dissipation function. When the aperture is greater than 10mm, it will further weaken the core structure strength and may also increase the clearance between the stator 13 winding and the core, affecting the motor's magnetic performance. An aperture of 8mm-10mm reduces the risk of blockage, prevents dust accumulation, and allows for easy cleaning with compressed air, while also preventing excessive reduction in core strength, thus balancing "ventilation efficiency" and "core performance".

[0025] like Figure 1 and Figure 2 As shown, the rotor 12 includes an iron core and a magnet. A U-shaped magnet groove is opened on the outer circumference of the iron core. Positioning bosses are provided on the inner walls of both sides of the magnet groove. The height of the bosses is 2mm-3mm. The magnet is made of neodymium iron boron material and is embedded in the magnet groove and engaged with the positioning bosses. At the same time, the gap between the magnet and the groove wall is filled with high-temperature resistant epoxy glue.

[0026] Specifically, the U-shaped structure can "wrap" the magnet on three sides, restricting the radial (direction of centrifugal force when the motor is running) and circumferential (direction of motor rotation) displacement of the magnet. This prevents the magnet from falling off the surface of the rotor 12 due to centrifugal force when the motor is running at high speed (the motor speed of the aerial work platform vehicle is usually 1500-3000 r / min), thus ensuring the operational safety of the rotor 12.

[0027] When the boss height is less than 2mm, the magnet cannot be effectively clamped, and the magnet is prone to wobbling in the slot; when the height is greater than 3mm, it will occupy the effective space of the magnet slot, reducing the volume of the magnet. The reduction in magnet volume will reduce the magnetic flux of the rotor, thereby reducing the output power of the motor; a height of 2mm-3mm can accurately clamp the magnet, and the magnet will not wobble significantly in the slot. At the same time, it will not occupy the effective working space of the magnet, ensuring the magnetic flux of rotor 12 and ensuring that the output torque of the motor meets the power requirements of the aerial work platform vehicle.

[0028] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A permanent magnet synchronous motor for aerial work platform vehicles, comprising a housing (10) and an end cover (11), characterized in that: The housing (10) is provided with a rotor (12) and a stator (13), and inclined heat dissipation fins (101) are evenly provided on the outer circumference of the housing (10). An annular heat dissipation cavity (111) is provided on the inner side of the end cover (11), and the annular heat dissipation cavity (111) is filled with thermally conductive silicone (112). Radial heat dissipation fins are provided on the outer surface of the end cover (11). The stator (13) includes an iron core, which has axial ventilation holes that are evenly distributed around the circumference of the iron core.

2. The permanent magnet synchronous motor for aerial work platform vehicles according to claim 1, characterized in that, The angle between the heat dissipation fin (101) and the axis of the casing (10) is 30°-45°, and the spacing between adjacent heat dissipation fins (101) is 15mm-20mm.

3. The permanent magnet synchronous motor for aerial work platform vehicles according to claim 1, characterized in that, The outer surface of the end cap (11) is provided with radial heat sinks, the thickness of which is 2mm-3mm.

4. The permanent magnet synchronous motor for aerial work platform vehicles according to claim 1, characterized in that, The number of ventilation holes is 6-8, and the hole diameter is 8mm-10mm.

5. The permanent magnet synchronous motor for aerial work platform vehicles according to claim 1, characterized in that, The rotor (12) includes: Iron core two: A U-shaped magnetic steel groove is opened on the outer circumference of iron core two, and positioning bosses are set on the inner walls of both sides of the magnetic steel groove, with a boss height of 2mm-3mm; The magnet is made of neodymium iron boron and is embedded in the magnet groove, engaging with the positioning boss. The gap between the magnet and the groove wall is filled with high-temperature resistant epoxy adhesive.

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