Self-circulation cooling structure, self-circulation cooling system and direct-drive permanent magnet synchronous mining lifting motor

Abstract

The invention belongs to the technical field of direct-drive permanent magnet synchronous motors, and relates to a self-circulation cooling structure, a self-circulation cooling system and a direct-drive permanent magnet synchronous mining lifting motor. Comprising a rotor self-circulation cooling structure and a stator self-circulation cooling system, and the rotor self-circulation cooling structure cools the outer wall of a rotor magnet yoke and the inner wall of a winch drum; the stator water jacket cooling structure is arranged between the stator bracket and the stator iron core, and the stator iron core is cooled through the stator water jacket cooling structure; the stator self-circulation cooling system cools a motor winding and a magnetic pole through wind path self-circulation under the driving of the rotor. The temperature gradient distribution from the magnet yoke to the winch drum can be realized, so that the temperature isolation is realized, and the influence of the magnet yoke temperature on the winch drum is avoided; the rotor self-circulation cooling system carries out cooling through self-rotation, a rotor cooling system does not need to be independently arranged, the part structure is simplified, the reliability of the rotor assembly is improved, and the cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of direct-drive permanent-magnet synchronous motors, and relates to a self-circulating cooling structure, a self-circulating cooling system, and a direct-drive permanent-magnet synchronous mining hoisting motor. Background Art

[0002] To actively respond to national development requirements, the project focuses on energy conservation, emission reduction, and efficiency improvement in raw coal transportation, striving to achieve a "green, intelligent, safe, economical, and efficient" transportation system upgrade. Electric motors drive mining trucks along the track ramp directly to the crushing station steps, shortening transportation distances and reducing fuel consumption, tire wear, and carbon emissions at the source.

[0003] However, due to the high dust levels in mining areas, the harsh cooling environment, and the temperature sensitivity of various motor components, mining has become a technical challenge. In view of this, the inventors have proposed a direct-drive permanent magnet synchronous mining hoist motor with a self-circulating cooling structure, which effectively solves the problems of mining hoist motors. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a self-circulating cooling structure, a self-circulating cooling system, and a direct-drive permanent magnet synchronous mining hoisting motor.

[0005] In the first aspect, the present invention provides a self-circulating cooling structure, including a rotor self-circulating cooling structure and a stator self-circulating cooling system, wherein the rotor self-circulating cooling structure cools the outer wall of the rotor yoke and the inner wall of the winch drum; the stator self-circulating cooling system includes a stator water jacket cooling structure, wherein the stator water jacket cooling structure is arranged between the stator bracket and the stator core, and the stator core is cooled by the stator water jacket cooling structure; the stator self-circulating cooling system cools the motor windings and magnetic poles through self-circulation of the air path under the drive of the rotor.

[0006] Furthermore, the rotor self-circulation cooling structure includes a rotor yoke, a first flange and a second flange are respectively provided at both ends of the rotor yoke, a ventilation structure is provided on the outer surface of the rotor yoke, the ventilation structure includes a plurality of annular ribs and a plurality of axial ribs, each of the annular ribs is perpendicular to the axial ribs, and an axial ventilation hole is provided on the annular rib between each two adjacent axial ribs; an outer cylinder is provided on the outside of the ventilation structure, the winch drum is located outside the outer cylinder, a first air guide plate is provided between the first end of the ventilation structure and the first flange, and a second air guide plate is provided between the second end of the ventilation structure and the second flange.

[0007] Furthermore, magnetic poles are provided on the inner wall of the rotor yoke.

[0008] Furthermore, the first air guide plate and the second air guide plate are in opposite directions.

[0009] Furthermore, the stator water jacket cooling structure includes a cooling water jacket arranged outside the stator bracket, a fixed axis is provided at the center position of the stator bracket, and the cooling water jacket is provided with a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe are connected to the outside through the cavity of the fixed axis.

[0010] Furthermore, the stator self-circulation cooling system includes a heat sink, which is located above the stator bracket, and a wind spoiler is provided on the rotor end cover.

[0011] Furthermore, both ends of the stator bracket are provided with ring plates, and axial ventilation holes are provided on the ring plates.

[0012] Furthermore, a wind spoiler and a sealing contact ring are provided on the rotor end cover, and the sealing contact ring cooperates with a dynamic seal installed on the stator bracket.

[0013] In a second aspect, the present invention provides a self-circulating cooling system, including any one of the self-circulating cooling devices described above.

[0014] In a third aspect, the present invention provides a direct-drive permanent magnet synchronous mining hoisting motor, comprising a self-circulating cooling system.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, through the direct ventilation structure design between the rotor yoke and the winch drum, a temperature gradient distribution from the yoke to the winch drum is realized, thereby achieving temperature isolation and avoiding the influence of the yoke temperature on the winch drum; the rotor self-circulation cooling system cools through its own rotation, without the need to set up a separate rotor cooling system, simplifying the component structure, improving the reliability of the rotor assembly, and reducing costs.

[0016] Second, the present invention incorporates a water jacket cooling structure inside the core and a dynamic seal between the stator bracket and end caps, isolating the temperature inward and reducing the impact of winding temperature on the stator bearings. The stator's self-circulating cooling system utilizes its own rotation for cooling, eliminating the need for a separate rotor cooling system. This simplifies component structure, improves stator assembly reliability, and reduces costs.

[0017] Third, the present invention uses a contact sealing structure, which can isolate the temperature of the core temperature area and reduce the impact of temperature rise on bearings and fixed shafts.

[0018] In summary, the present invention proposes a self-circulating cooling structure for a direct-drive permanent magnet synchronous mining hoisting motor, which utilizes the rotation of the motor itself to realize air circulation on the outside of the rotor and air flow on the back of the stator and in the air gap between the stator and rotor, thereby achieving heat dissipation and cooling of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the invention.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 This is a schematic diagram of the overall structure of the self-circulating cooling structure of the present invention; Figure 2 This is a schematic diagram of the rotor self-circulating cooling structure of the present invention; Figure 3 A side view of the rotor self-circulating cooling structure of the present invention; Figure 4 A cross-sectional view of the rotor self-circulating cooling structure of the present invention; Figure 5 Schematic diagram of wind direction when the rotor of the present invention rotates clockwise; Figure 6 Schematic diagram of the wind path when the rotor of the present invention rotates clockwise; Figure 7 Schematic diagram of wind direction when the rotor of the present invention rotates counterclockwise; Figure 8 Schematic diagram of the wind path when the rotor of the present invention rotates counterclockwise; Figure 9 A schematic diagram of the positions of the stator water jacket cooling structure and the heat sink of the present invention; Figure 10 Schematic diagram of the stator water jacket cooling structure of the present invention; Figure 11 is a schematic diagram of the rotor end cover of the present invention; Figure 12 It is a schematic diagram of the air path of the rotor self-circulation cooling structure and the stator self-circulation cooling system of the present invention.

[0022] Among them: 1 is the yoke; 2-1 is the first flange; 2-2 is the second flange; 3-1 is the first air guide plate; 3-2 is the second air guide plate; 4 is the axial ventilation hole; 5 is the axial rib plate; 6 is the ring rib; 7 is the winch drum; 8-1 is the water inlet pipe; 8-2 is the water outlet pipe; 9 is the stator bracket; 9-1 is the ring plate; 10 is the heat sink; 11 is the cooling water jacket; 12 is the wind spoiler; 13 is the sealing contact ring; 14 is the rotor bracket inner component; 15 is the stator core; 16 is the rotor end cover. DETAILED DESCRIPTION

[0023] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Example

[0025] like Figure 1 As shown, a self-circulating cooling structure includes a rotor self-circulating cooling structure and a stator self-circulating cooling system. The rotor self-circulating cooling structure cools the outer wall of the rotor yoke 1 and the inner wall of the winch drum 7; the stator self-circulating cooling system includes a stator water jacket cooling structure, which is arranged between the stator bracket 9 and the stator core 15, and the stator core 15 is cooled by the stator water jacket cooling structure; the stator self-circulating cooling system cools the motor windings and magnetic poles through self-circulation of the air path under the drive of the rotor.

[0026] In this embodiment, the motor utilizes its own rotation to achieve air circulation outside the rotor, as well as air flow around the back of the stator and in the stator-rotor air gap, thereby achieving heat dissipation and cooling. A water jacket cooling structure inside the core and a dynamic seal between the stator bracket and end caps isolate the temperature inward, minimizing the impact of winding temperature on the stator bearings.

[0027] like Figure 2 As shown, the rotor self-circulation cooling structure includes a rotor yoke 1, and a first flange 2-1 and a second flange 2-2 are respectively provided at both ends of the rotor yoke 1. A ventilation structure is provided on the outer surface of the rotor yoke 1, and the ventilation structure includes a plurality of annular ribs 6 and a plurality of axial ribs 5. Each of the annular ribs 6 is perpendicular to the axial ribs 5, and an axial ventilation hole 4 is provided on the annular ribs 6 between each two adjacent axial ribs 5; an outer cylinder is provided on the outside of the ventilation structure, and a first air guide plate 3-1 is provided between the first end of the ventilation structure and the first flange 2-1, and a second air guide plate 3-2 is provided between the second end of the ventilation structure and the second flange 2-2.

[0028] In this embodiment: through the direct ventilation structure design between the rotor yoke and the winch drum, a temperature gradient distribution from the yoke to the winch drum is realized, thereby achieving temperature isolation and avoiding the influence of the yoke temperature on the winch drum; the rotor self-circulation cooling system cools through its own rotation, and there is no need to set up a separate rotor cooling system, which simplifies the component structure, improves the reliability of the rotor assembly, and reduces costs.

[0029] like Figure 3-4As shown, the rotor self-circulating cooling system consists of a yoke 1, two end flanges (first flange 2-1, second flange 2-2), axial ribs 5, annular ribs 6, a winch drum 7, and air deflectors (first air deflector 3-1, second air deflector 3-2). The yoke 1, two end flanges (first flange 2-1, second flange 2-2), axial ribs 5, and annular ribs 6 together form the rotor support inner assembly 14. There are 24 axial ribs 5, uniformly welded to the outer circumference of the yoke 1 and welded to the flanges at both ends. There are six annular ribs 6, uniformly welded axially to the outer circumference of the yoke. The annular ribs 6 and axial ribs 5 are perpendicular to each other, and circular ventilation holes are provided on the axial annular ribs 5 between each pair of annular ribs 6. The rotor support inner assembly 14 and the winch drum 7 directly form an axial ventilation duct structure.

[0030] During the operation of the motor, there are clockwise and counterclockwise rotation conditions. Figure 5-6 As shown, when the motor rotates clockwise, under the action of the air guide plate, the outer surface of the yoke 1 is cooled through the axial ventilation duct to avoid the influence of the temperature of the yoke 1 on the winch drum 7; Figures 7 and 8 As shown, when the motor rotates counterclockwise, under the action of the air guide plate, the outer surface of the yoke 1 is cooled through the axial ventilation duct to avoid the influence of the temperature of the yoke 1 on the winch drum 7. Through this structural design, the motor can achieve cooling effect whether it runs clockwise or counterclockwise.

[0031] Furthermore, the outside of the outer cylinder is a winch drum 7 , and magnetic poles 4 are provided on the inner wall of the rotor yoke 1 .

[0032] In this embodiment, the rotor support inner component 14 and the winch drum 7 are interference fit, the axial length of the winch drum 7 is consistent with the width of the annular ribs 6 on both sides of the rotor support inner component 14, and the two ends are welded together with the annular ribs 6.

[0033] Furthermore, the first air guide plate 3 - 1 and the second air guide plate 3 - 2 are in opposite directions.

[0034] In this embodiment, air guide plates are installed on the axial ribs 5 of the rotor bracket inner component 14 near the flanges at both ends, and the air guide plates at both ends are in opposite directions, which facilitates the entry of cold air and the discharge of hot air, thereby increasing the cooling efficiency.

[0035] Furthermore, if Figures 9 and 10 As shown, the stator water jacket cooling structure includes a cooling water jacket 11 arranged outside the stator bracket 9, a fixed axis is provided at the center position of the stator bracket 9, and the cooling water jacket 11 is provided with an inlet pipe 8-1 and an outlet pipe 8-2. The inlet pipe 8-1 and the outlet pipe 8-2 are connected to the outside through the cavity of the fixed axis.

[0036] In this embodiment, the stator water jacket cooling structure is integrated with the stator support 9 and located on the outer circumference of the stator support 9. The cooling water jacket 11 is equipped with inlet and outlet pipes. Heat sinks 10 are welded to the side of the cooling water jacket 11 near the center. Forty-eight heat sinks 10 are evenly distributed around the circumference, arranged in two layers. These heat sinks 10 are enclosed in a cavity formed by ring plates 9-1 on either side of the stator support 9 and the cover plate of the stator support 9. Axial ventilation holes 4 are provided in the ring plates 9-1.

[0037] Furthermore, the stator self-circulation cooling system includes a heat sink 10 , and the heat sink 10 is located above the stator bracket 9 .

[0038] Furthermore, both ends of the stator bracket 9 are provided with an annular plate 9 - 1 , and the annular plate 9 - 1 is provided with an axial ventilation hole 10 .

[0039] In this embodiment, the cooling water jacket 11 is connected to an external cooling water circuit, cooling the stator core 15 while simultaneously reducing the temperature of the heat sink 10. Under the action of the rotor's rotation, the wind spoiler 12 acts as a centrifugal fan, driving air outward, forming a circulating air path. This centrifugal fan forces the cold air outward, entering the stator-rotor air gap and cooling it. This hot air then converges between the two cores. This hot air then flows through the axial ventilation holes 4 of the stator support 9 into the cavity of the stator support 9, where it is cooled by the heat sink 10, completing the entire circulation process.

[0040] In addition, the stator self-circulating cooling system can be combined with the stator water jacket cooling structure, and the cooling water jacket can reduce the temperature of the heat sink.

[0041] Furthermore, if Figure 11 As shown, a spoiler plate 12 and a sealing contact ring 13 are provided on the rotor end cover 16 .

[0042] In this embodiment, the rotor end cap is equipped with a spoiler plate 12 and a sealing contact ring 13. When the motor rotates, the spoiler plate 12 drives air flow. The sealing contact ring 13 cooperates with the dynamic seal mounted on the stator bracket 9 to seal the core winding and magnetic poles within the cavity.

[0043] In a second aspect, the present invention provides a self-circulating cooling system, comprising any one of the self-circulating cooling devices described above.

[0044] In a third aspect, the present invention provides a direct-drive permanent magnet synchronous mining hoisting motor, comprising a self-circulating cooling system.

[0045] Specific cooling method: Rotor self-circulation cooling structure: Under the action of the wind guide plate, the wind passes through the axial ventilation holes 4, through the axial ventilation channel formed by the axial ribs 5 and the ring ribs 6, and cools the outer surface of the yoke; Stator water jacket cooling structure: The stator water jacket is connected to an external cooling water circuit. The water inlet and outlet pipes of the cooling water circuit are connected to the outside through the cavity of the stator shaft. The cooling water circuit flows over the stator core and is mainly used to cool the stator core.

[0046] Stator self-circulating cooling system: Figure 12 As shown, under the action of the rotor rotation, the spoiler 12 is equivalent to a centrifugal fan, driving the wind to flow outward, forming a circulating air path structure. Figure 12 As shown by the blue arrow in the middle, the cold air flows outward under the action of the spoiler 12, enters the gap between the stator and rotor, cools it, and forms hot air, as shown in the figure. Figure 12 As shown by the green arrow in the figure, the hot air gathers in the middle of the two stator cores 15, enters the cavity of the stator bracket 9 through the axial ventilation holes 4 of the stator bracket, and is cooled by the heat sink 10. The cooled cold air re-circulates under the action of the wind spoiler 12, completing the entire circulation process. In addition, the stator water jacket cooling structure can be combined with the stator self-circulating cooling system to cool the heat sink 10.

Claims

1. A self-circulating cooling structure, characterized in that: The invention comprises a rotor self-circulating cooling structure and a stator self-circulating cooling system, wherein the rotor self-circulating cooling structure cools the outer wall of the rotor yoke (1) and the inner wall of the winch drum (7); the stator self-circulating cooling system comprises a stator water jacket cooling structure, wherein the stator water jacket cooling structure is arranged between the stator bracket (9) and the stator core (15), and the stator core (15) is cooled by the stator water jacket cooling structure; the stator self-circulating cooling system cools the motor windings and magnetic poles by self-circulating the air path under the drive of the rotor.

2. A self-circulating cooling structure according to claim 1, characterized in that: The rotor self-circulation cooling structure comprises a rotor yoke (1), wherein a first flange (2-1) and a second flange (2-2) are respectively provided at both ends of the rotor yoke (1), and a ventilation structure is provided on the outer surface of the rotor yoke (1), wherein the ventilation structure comprises a plurality of annular ribs (6) and a plurality of axial rib plates (5), wherein each annular rib (6) is perpendicular to the axial rib plate (5), and an axial ventilation hole (4) is provided on the annular rib (6) between each two adjacent axial rib plates (5); an outer cylinder is provided on the outside of the ventilation structure, and the winch drum (7) is located outside the outer cylinder; a first air guide plate (3-1) is provided between the first end of the ventilation structure and the first flange (2-1), and a second air guide plate (3-2) is provided between the second end of the ventilation structure and the second flange (2-2).

3. A direct-drive permanent magnet synchronous mining hoisting motor self-circulation cooling structure according to claim 2, characterized in that: The first air guide plate (3-1) and the second air guide plate (3-2) are in opposite directions.

4. The self-circulating cooling structure according to claim 1, characterized in that: Magnetic poles (4) are provided on the inner wall of the rotor yoke (1).

5. The self-circulating cooling structure according to claim 1, characterized in that: The stator water jacket cooling structure comprises a cooling water jacket (11) arranged outside a stator bracket (9), a fixed axis is arranged at the center of the stator bracket (9), and the cooling water jacket (11) is provided with a water inlet pipe (8-1) and a water outlet pipe (8-2), and the water inlet pipe (8-1) and the water outlet pipe (8-2) are connected to the outside through a cavity of the fixed axis.

6. The self-circulating cooling structure according to claim 1, characterized in that: The stator self-circulating cooling system comprises a heat sink (10), the heat sink (10) is located above the stator bracket (9), and a wind spoiler (12) is provided on the rotor end cover (16).

7. The self-circulating cooling structure according to claim 6, characterized in that: Both ends of the stator bracket (9) are provided with ring plates (9-1), and the ring plates (9-1) are provided with axial ventilation holes (10).

8. The direct-drive permanent magnet synchronous mining hoisting motor self-circulation cooling structure according to claim 6 is characterized in that: A sealing contact ring (13) is provided on the rotor end cover (16), and the sealing contact ring (13) cooperates with a dynamic seal installed on the stator bracket.

9. A self-circulating cooling system, characterized in that: The self-circulating cooling device comprises the self-circulating cooling device according to any one of claims 1 to 8.

10. A direct drive permanent magnet synchronous mining hoisting motor, characterized in that: Includes the self-circulating cooling system according to claim 9.

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