A permanent magnet direct drive top drive motor and its installation method

Abstract

The present invention discloses a permanent magnet direct drive top drive motor and its installation method, which belongs to the technical field of direct drive permanent magnet motors and aims to solve the technical problem of poor heat dissipation performance of permanent magnet direct drive top drive motors in the prior art. It includes a main shaft, a stator assembly, a rotor assembly, a cooling assembly and a housing; the rotor assembly includes a rotor core and a rotor bracket, and the main shaft is connected to the rotor core through the rotor bracket; the cooling assembly includes a fan, an air guide connected to the output end of the fan, and air guide vanes arranged in the housing; the air guide vanes and the inner wall of the housing form a first cooling channel; the housing includes an upper end cover and a lower end cover, and the lower end cover is provided with a plurality of ventilation holes; the cooling air is input by the fan, passes through the air guide and the first cooling channel, and is output from the ventilation holes. The permanent magnet direct drive top drive motor provided by the present invention is easy to assemble, has strong reliability, good overall heat dissipation efficiency, and a long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of direct-drive permanent magnet motors, and in particular to a permanent magnet direct-drive top-drive motor. Background Art

[0002] During motor operation, heat dissipation is directly related to the motor's performance and service life. In order to prevent the permanent magnet from irreversibly demagnetizing at high temperatures, the motor's heat dissipation structure design is particularly important.

[0003] In the existing technology, the heat dissipation solution is mostly suction-type air cooling. The cooling fan draws the hot air inside the motor and discharges it into the surrounding atmosphere. The hot air in the motor flows from bottom to top, forming a negative pressure, the air density becomes lower, and the cooling effect becomes worse. In addition, the fan volute and the wind tube are usually connected with bolts, but the bolts may loosen during long-term operation, thereby changing the tightness of the connection between the volute and the wind tube, thereby destroying the normal flow path and flow of the cooling air, and thus reducing the heat dissipation efficiency. At the same time, it may also cause abnormal conditions such as friction and collision between the fan and motor components, increasing the risk of equipment failure.

[0004] Therefore, there is an urgent need for a permanent magnet direct-drive top drive motor with good heat dissipation performance. Summary of the Invention

[0005] The object of the present invention is to provide a permanent magnet direct drive top drive motor and an installation method thereof, so as to solve the technical problem of poor heat dissipation performance of the permanent magnet direct drive top drive motor in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] The present invention provides a permanent magnet direct drive top drive motor, comprising a main shaft, a stator assembly, a rotor assembly, a cooling assembly and a housing;

[0008] The rotor assembly includes a rotor core and a rotor bracket, and the main shaft is connected to the rotor core through the rotor bracket;

[0009] The cooling assembly includes a fan, an air guide tube connected to the output end of the fan, and an air guide plate arranged in the shell; the air guide plate and the inner wall of the shell form a first cooling channel;

[0010] The shell includes an upper end cover and a lower end cover, and the lower end cover is provided with a plurality of ventilation holes 1; the cooling air is input by the fan, passes through the air guide tube and the first cooling flow channel, and is output from the ventilation holes 1.

[0011] By providing a cooling component, the fan introduces external cooling air, which is then output from the ventilation hole after passing through the corresponding cooling flow channel, thereby increasing the heat exchange area and improving the heat dissipation efficiency.

[0012] Optionally or preferably, the rotor core comprises a plurality of punching sheets, and end plates are provided at both ends of the plurality of punching sheets and fixed by screws and first nuts;

[0013] A sealing plate is provided on the outer side of the end plate, and the sealing plate is fixed to the screw rod through a second nut;

[0014] The sealing plate is further provided with a balancing block, which is used to balance the rotor, thereby reducing the offset of the rotor's center of mass.

[0015] By providing the end plates, warping and deformation of the punching sheets can be avoided, thereby increasing the rigidity of the rotor core.

[0016] Optionally or preferably, a plurality of magnets are embedded in the rotor core, and magnetic isolation plates are provided at both end portions of the magnets, and the magnetic isolation plates are made of non-magnetic material.

[0017] By providing a magnetic isolation plate at the end of the magnet, the influence of external factors on the magnetic domains at the four corners of the magnet can be reduced, thereby avoiding demagnetization at the four corners of the magnet;

[0018] Optionally or preferably, a plurality of ventilation holes 2 are provided on the rotor core;

[0019] The inner cavity of the shell is communicated with the second ventilation hole and forms a second cooling flow channel.

[0020] Optionally or preferably, the rotor support comprises an inner cylinder and an outer cylinder;

[0021] A plurality of supporting ribs are provided along the axial direction of the inner cylinder, and the inner cylinder and the outer cylinder are fixedly connected via the plurality of supporting ribs;

[0022] A plurality of reinforcing ribs are provided along the circumference of the inner cylinder, and both ends of the reinforcing ribs are fixedly connected to the adjacent supporting ribs.

[0023] Optionally or preferably, the inner cylinder is provided with a web plate in the circumference thereof, and the web plate is provided with a plurality of ventilation holes three;

[0024] A third cooling channel is formed between the rotor bracket and the rotor core.

[0025] Optionally or preferably, the inner cylinder and the main shaft are connected via an expansion sleeve or a spline;

[0026] A keyway is provided on the supporting rib, and a key is correspondingly provided on the inner side of the rotor core. The rotor core and the rotor bracket are connected via the keyway.

[0027] Optionally or preferably, a U-shaped notch is provided on the outer cylinder, and the U-shaped notch and the support rib are arranged in an alternating manner.

[0028] By opening a U-shaped notch on the outer cylinder, welding is facilitated on the one hand, and the installation of the expansion sleeve is facilitated on the other hand, thereby reducing weight.

[0029] Optionally or preferably, the fan volute and the air guide cylinder are integrally arranged;

[0030] The fan air inlet is provided with a filter element, and the filter element includes a steel plate mesh and a filter mesh arranged in sequence.

[0031] The integrated design of the fan and air guide tube optimizes the air flow path and avoids the impact of vibration on the tightness of the connection; the provision of filters can prevent impurities from entering the motor through the fan and affecting the motor's performance and life.

[0032] A method for installing a permanent magnet direct drive top drive motor comprises the following steps:

[0033] S1. Assemble the spindle and housing and place them upside down on the platform;

[0034] S2. Hoist the stator assembly and connect it to the housing;

[0035] S3. The rotor bracket and the main shaft are fitted with clearance, the rotor core is positioned through the rotor bracket and the main shaft, and is installed into the stator assembly from top to bottom;

[0036] S4. Fix the rotor bracket and the main shaft through the expansion sleeve, and install the upper end bearing and the upper end cover;

[0037] S5. Install the cooling assembly.

[0038] Based on the above technical solution, the present invention can produce at least the following technical effects:

[0039] The permanent magnet direct-drive top drive motor provided by the present invention changes the traditional negative pressure suction cooling method by providing a cooling assembly and corresponding cooling channels. External cooling air is introduced by a fan and output through the corresponding cooling channels through the ventilation holes, thereby increasing the heat exchange area and improving the heat dissipation efficiency. At the same time, the integrated design of the fan and air guide tube optimizes the air flow path and avoids the influence of vibration on the tightness of the connection.

[0040] By providing a magnetic isolation plate at the end of the magnet, the influence of external factors on the magnetic domains at the four corners of the magnet can be reduced, thereby avoiding demagnetization at the four corners of the magnet;

[0041] The provision of a rotor bracket can effectively transmit the main shaft torque on the one hand, and on the other hand, when the rotor bracket and the main shaft are loosely matched and connected using an expansion sleeve, it can effectively prevent the stator and rotor from adsorbing during installation of the motor;

[0042] The present invention provides a permanent magnet direct drive top drive motor installation method, which can avoid the adsorption of the stator and rotor without the need for special tooling, thereby facilitating the disassembly and assembly of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the overall structure of the permanent magnet direct drive top drive motor of the present invention. Figure 1 ;

[0044] Figure 2 This is a schematic diagram of the overall structure of the permanent magnet direct drive top drive motor of the present invention. Figure 2 ;

[0045] Figure 3 It is a side sectional view of the main shaft and rotor assembly (expansion sleeve connection) in the permanent magnet direct drive top drive motor of the present invention;

[0046] Figure 4 yes Figure 3 A partial enlarged view of part A in the middle;

[0047] Figure 5 Schematic diagram of the structure of the rotor assembly in the permanent magnet direct drive top drive motor of the present invention;

[0048] Figure 6 Schematic diagram of the cross-sectional structure of the rotor assembly in the permanent magnet direct-drive top drive motor of the present invention;

[0049] Figure 7 yes Figure 6 A partial enlarged view of part B in the middle;

[0050] Figure 8 It is a structural schematic diagram of the rotor bracket (expansion sleeve connection) in the permanent magnet direct drive top drive motor of the present invention;

[0051] Figure 9 2. It is a structural schematic diagram of the middle plate of the permanent magnet direct drive top drive motor of the present invention;

[0052] Figure 10 This is a schematic diagram of the connection structure between the fan and the air guide tube in the permanent magnet direct drive top drive motor of the present invention;

[0053] Figure 11 This is a cross-sectional view of the permanent magnet direct drive top drive motor of the present invention;

[0054] Figure 12 1. It is a top view of the permanent magnet direct drive top drive motor of the present invention;

[0055] Figure 13 1 is a schematic diagram of the state of step S1 of the permanent magnet direct drive top drive motor installation method of the present invention;

[0056] Figure 14 2 is a schematic diagram of the state of step S2 of the permanent magnet direct drive top drive motor installation method of the present invention;

[0057] Figure 15 It is a state diagram of steps S3 to S4 of the permanent magnet direct drive top drive motor installation method of the present invention.

[0058] In the figure: 10, main shaft; 20, stator assembly; 30, rotor assembly; 31, rotor core; 311, punching sheet; 312, end plate; 313, screw; 314, first nut; 315, sealing plate; 316, second nut; 317, magnet; 318, magnetic isolation plate; 319, vent two; 32, rotor bracket; 321, inner cylinder; 322, outer cylinder; 322a, U-shaped notch; 323, support rib; 323a, keyway; 324, reinforcing rib; 325, web; 325a, vent three; 40, cooling assembly; 41, fan; 42, air guide tube; 43, air guide vane; 44, filter element; 50, housing; 51, upper end cover; 52, lower end cover; 53, vent one; A1, first cooling channel; A2, second cooling channel; A3, third cooling channel. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work shall fall within the scope of protection of the present invention.

[0060] Example 1:

[0061] See also Figures 1 to 2 , a permanent magnet direct drive top drive motor, which includes a main shaft 10, a stator assembly 20, a rotor assembly 30, a cooling assembly 40 and a shell 50; the hollow arrows in the figure indicate the direction of cooling air flow.

[0062] In this embodiment, the stator assembly 20 is a prior art, including a stator core, a stator winding, a base and other structures, and technicians can select and set them according to actual work needs.

[0063] See also Figures 3 to 9 In this embodiment, the rotor assembly 30 includes a rotor core 31 and a rotor bracket 32, and the main shaft 10 is connected to the rotor core 31 through the rotor bracket 32; specifically, the main shaft 10 and the rotor bracket 32 ​​are connected by an expansion sleeve or a spline, and the rotor bracket 32 ​​and the rotor core 31 are connected by a key.

[0064] The rotor core 31 includes multiple punching sheets 311. In order to prevent the punching sheets 311 from warping and deformation and to increase the rigidity of the rotor core 31, in this embodiment, the two end covers of the rotor core 31 are provided with end plates 312, and the two end plates 312 are fixed by screws 313 and first nuts 314.

[0065] In addition, a sealing plate 315 is provided on the outside of the end plate 312, and the sealing plate 315 is fixed to the screw 313 through a second nut 316; a balancing block is also integrally provided on the sealing plate 315, and the balancing block is used to balance the rotor, reduce the offset of the rotor center of mass, and increase the operating stability.

[0066] A plurality of magnets 317 are embedded in the rotor core 31. The magnets 317 are generally rectangular blocks. Since the magnetic domains inside the magnets 317 are arranged at the corners and are affected by boundary conditions, the stability of the magnetic domain structure is relatively weak. In order to avoid demagnetization at the four corners of the magnets 317, in this embodiment, magnetic isolation plates 318 are provided at both end portions of the magnets 317. The magnetic isolation plates 318 are made of non-magnetic material, thereby reducing the influence of external factors on the magnetic domains at the four corners and avoiding demagnetization at the corners of the magnets 317.

[0067] In this embodiment, the rotor support 32 includes an inner cylinder 321 and an outer cylinder 322. At least four support ribs 323 are arranged axially along the inner cylinder 321, and the inner cylinder 321 and the outer cylinder 322 are fixedly connected by the support ribs 323; at least four reinforcing ribs 324 are arranged circumferentially along the inner cylinder 321, and the two ends of the reinforcing ribs 324 are fixedly connected to adjacent support ribs 323.

[0068] By providing the above-mentioned support ribs 323 and reinforcement ribs 324, the support strength of the rotor bracket 32 ​​is improved; in addition, in order to ensure the strength of the rotor bracket 32 ​​while reducing the mass of the rotor bracket 32, in this embodiment, a U-shaped notch 322a is opened on the outer cylinder 322, and the U-shaped notch 322a is staggered with the above-mentioned support ribs 323.

[0069] In this embodiment, a key slot 323 a is provided on the support rib 323 , and a flat key is correspondingly provided on the inner side of the rotor core 31 . The rotor core 31 and the rotor bracket 32 ​​are key-connected via the key slot 323 a and the flat key.

[0070] In order to improve the heat dissipation performance of the motor, a cooling assembly 40 is further provided in this embodiment.

[0071] Specifically, the cooling assembly 40 includes a fan 41 , an air guide tube 42 connected to an output end of the fan 41 , and an air guide plate 43 disposed in the housing 50 .

[0072] See also Figures 10 to 12 , the hollow arrows in the figure indicate the direction of cooling air flow; in order to increase the heat exchange area of ​​the motor, in this embodiment, a plurality of cooling channels are provided.

[0073] Specifically, a first cooling channel A1 is formed between the air guide plate 43 and the inner wall of the shell 50; a plurality of ventilation holes 319 are provided on the rotor core 31, and the inner cavity of the shell 50 is connected to the ventilation holes 319 to form a second cooling channel A2; a web 325 is circumferentially arranged on the inner cylinder 321, and a plurality of ventilation holes 325a are provided on the web 325; a third cooling channel A3 is formed between the rotor bracket 32 ​​and the rotor core 31.

[0074] The cooling air is input by the fan 41, and enters the first cooling channel A1, the second cooling channel A2 and the third cooling channel A3 after passing through the air guide 42, and is finally discharged through the ventilation hole 53 on the lower end cover 52 to complete the cooling.

[0075] In this embodiment, the cooling air in the first cooling channel A1 is used to absorb heat from the stator core and stator winding; the cooling air in the second cooling channel A2 and the third cooling channel A3 is used to absorb heat from the rotor part, and is finally discharged together through the ventilation hole 53.

[0076] In order to improve reliability and avoid the influence of vibration on the tightness of the connection, in this embodiment, the fan 41 and the air guide tube 42 are connected in an integrated manner.

[0077] In order to prevent impurities from entering the motor through the fan and affecting the motor performance and life, in this embodiment, a filter element 44 is further provided at the air inlet of the fan 41. The filter element 44 includes a steel plate mesh and a filter mesh arranged in sequence.

[0078] Example 2:

[0079] See also Figures 13 to 15 Based on the first embodiment, this embodiment provides a motor installation method, thereby avoiding the assembly difficulty problem caused by the stator and rotor being easily adsorbed together during installation of the motor, and includes the following steps:

[0080] S1, assemble the main shaft 10 and the housing 50, and place them upside down on a platform;

[0081] S2. Hoist the stator assembly 20 and connect it to the housing 50;

[0082] S3, the rotor bracket 32 ​​and the main shaft 10 are clearance-fitted, the rotor core 31 is positioned by the rotor bracket 32 ​​and the main shaft 10, and is installed into the stator assembly 20 from top to bottom;

[0083] S4, fix the rotor bracket 32 ​​and the main shaft 10 by means of an expansion sleeve, and install the upper end bearing and the upper end cover 51;

[0084] S5. Install the cooling assembly 40.

[0085] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0086] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet direct drive top drive motor, characterized in that: It includes a main shaft (10), a stator assembly (20), a rotor assembly (30), a cooling assembly (40) and a housing (50); The rotor assembly (30) comprises a rotor core (31) and a rotor bracket (32), and the main shaft (10) is connected to the rotor core (31) via the rotor bracket (32); The cooling assembly (40) includes a fan (41), an air guide tube (42) connected to the output end of the fan (41), and an air guide plate (43) disposed in the housing (50); the air guide plate (43) and the inner wall of the housing (50) form a first cooling channel (A1); The housing (50) includes an upper end cover (51) and a lower end cover (52), and the lower end cover (52) is provided with a plurality of ventilation holes (53); cooling air is input by the fan (41), passes through the air guide tube (42) and the first cooling flow channel (A1), and is output from the ventilation holes (53); The rotor core (31) is provided with a plurality of ventilation holes (319); The inner cavity of the shell (50) is in communication with the second ventilation hole (319) and forms a second cooling channel (A2); The rotor support (32) comprises an inner cylinder (321) and an outer cylinder (322); a web (325) is circumferentially provided on the inner cylinder (321); and a plurality of ventilation holes (325a) are provided on the web (325); A third cooling channel (A3) is formed between the rotor bracket (32) and the rotor core (31); The volute of the fan (41) and the air guide tube (42) are integrally arranged; The air inlet of the fan (41) is provided with a filter element (44), and the filter element (44) comprises a steel plate mesh and a filter mesh arranged in sequence.

2. The permanent magnet direct drive top drive motor according to claim 1, characterized in that: The rotor core (31) comprises a plurality of punching sheets (311), and end plates (312) are provided at both ends of the plurality of punching sheets (311) and are fixed by screw rods (313) and first nuts (314); A sealing plate (315) is provided on the outside of the end plate (312), and the sealing plate (315) is fixed to the screw rod (313) via a second nut (316); A balancing block is also integrally provided on the sealing plate (315), and the balancing block is used to balance the rotor, thereby reducing the offset of the rotor's center of mass.

3. The permanent magnet direct drive top drive motor according to claim 1, characterized in that: A plurality of magnetic steels (317) are embedded in the rotor core (31), and magnetic isolation plates (318) are provided at both end portions of the magnetic steels (317). The magnetic isolation plates (318) are made of non-magnetic conductive material.

4. The permanent magnet direct drive top drive motor according to claim 1, characterized in that: The inner cylinder (321) is provided with a plurality of support ribs (323) along the axial direction, and the inner cylinder (321) and the outer cylinder (322) are fixedly connected via the plurality of support ribs (323); A plurality of reinforcing ribs (324) are provided along the circumference of the inner cylinder (321), and both ends of the reinforcing ribs (324) are fixedly connected to adjacent supporting ribs (323); A third cooling channel (A3) is formed between the rotor bracket (32) and the rotor core (31).

5. The permanent magnet direct drive top drive motor according to claim 4, characterized in that: The inner cylinder (321) and the main shaft (10) are connected via an expansion sleeve or a spline; A keyway (323a) is provided on the support rib (323), a key is correspondingly provided on the inner side of the rotor core (31), and the rotor core (31) and the rotor bracket (32) are connected via the keyway (323a).

6. The permanent magnet direct drive top drive motor according to claim 4, characterized in that: A U-shaped notch (322a) is provided on the outer cylinder (322), and the U-shaped notch (322a) and the supporting ribs (323) are arranged in an alternating manner.

7. A method for installing a permanent magnet direct drive top drive motor, characterized in that: The method for installing the permanent magnet direct drive top drive motor according to any one of claims 1 to 6 comprises the following steps: S1, assemble the main shaft (10) and the housing (50), and place them upside down on the platform; S2, hoisting the stator assembly (20) and connecting it to the housing (50); S3, the rotor bracket (32) and the main shaft (10) are clearance-matched, the rotor core (31) is positioned through the rotor bracket (32) and the main shaft (10), and is installed into the stator assembly (20) from top to bottom; S4, fixing the rotor bracket (32) and the main shaft (10) by means of an expansion sleeve, and installing the upper end bearing and the upper end cover (51); S5. Install the cooling assembly (40).

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