A high-voltage permanent magnet direct-drive stirring motor

Abstract

The present invention discloses a high-voltage permanent magnet direct-drive stirring motor, comprising a casing, a cover, an output shaft, a stator frame, a stator, and a rotor. The casing is provided with a cover tightly fixed by bolts, and the casing is provided with an output shaft, a stator frame, a stator, and a rotor. The stator frame is fixed to the casing via a base, and the stator frame is rotatably connected to the output shaft via an inner bearing. An iron core assembly is installed on the outer side of the stator frame. The high-voltage permanent magnet direct-drive stirring motor adopts an outer rotor high-voltage direct drive technology, the rotor portion adopts a multi-pole surface-mounted structure, a flange and a drive shaft are installed at the bottom of the rotor, and the drive shaft is directly connected to the stirring device. The stator portion adopts a high-voltage formed coil, thereby reducing current and transmission pressure. The interaction between the magnetic field of the rotor permanent magnet and the rotating magnetic field generated by the stator winding generates torque, thereby directly driving the stirring device.

Description

Technical Field

[0001] The present invention relates to the technical field of special motor design and manufacturing, in particular to a high-voltage permanent magnet direct-drive stirring motor. Background Art

[0002] Since my country launched the "Large-Scale Equipment Renewal Action Plan", all parts of the country have promoted equipment renewal and transformation in the direction of intelligent upgrading, safe production, loss reduction and efficiency improvement. Among industrial equipment, permanent magnet direct drive motors have received widespread attention due to their advantages in energy efficiency improvement and low-carbon emission reduction.

[0003] With the continuous development of my country's rare earth resource refining technology and high-voltage power electronics technology, permanent magnet direct-drive motors currently have advantages in output performance, control accuracy, and intelligent control.

[0004] The stirring transmission device in the food additive bio-fermentation industry currently uses the traditional asynchronous motor + reducer method, which is heavy, complex to install and has high requirements. It is prone to oil leakage during operation and does not meet the food safety requirements of food additives.

[0005] Technical defects and their causes

[0006] 1. The traditional mixing drive system consists of an asynchronous motor and a reducer. This drive form has low overall efficiency due to the large number of transmission links. At the same time, there is a risk of leakage in the reducer and other equipment, which may contaminate the product, and the daily maintenance workload is large.

[0007] 2. The internal space of the existing high-power inner rotor permanent magnet direct-drive stirring motor rotor is only used to transmit torque, and the internal space of the motor is not fully utilized, resulting in a large motor volume, which is not conducive to equipment installation and maintenance.

[0008] 3. The existing air-cooled outer rotor high-voltage permanent magnet direct-drive stirring motor has a large motor size due to its high insulation thickness and limited air-cooling heat dissipation capacity, which is not conducive to equipment installation and maintenance. Summary of the Invention

[0009] The object of the present invention is to provide a high-voltage permanent magnet direct-drive stirring motor to solve the problems raised in the above background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A high-voltage permanent magnet direct-drive stirring motor comprises a casing, a cover, an output shaft, a stator frame, a stator, and a rotor. The casing is provided with a cover tightly fixed by bolts. The casing is provided with an output shaft, a stator frame, a stator, and a rotor. The stator frame is fixed to the casing via a base. The stator frame is rotatably connected to the output shaft via an inner bearing. An iron core assembly is mounted on the outside of the stator frame. A coil is wound around the outside of the iron core assembly. A permanent magnet located outside the iron core assembly is mounted inside the rotor.

[0012] An oil cooler and a micro oil pump are installed in the engine cover, an oil guide groove is opened in the core assembly, and the coolant in the oil cooler circulates in the oil guide groove of the core assembly through the micro oil pump.

[0013] As a further solution of the present invention: the iron core assembly is composed of silicon steel sheets stacked on each other, and the silicon steel sheets include a front cover plate, a rear cover plate, a stacking plate and an oil return plate. The front cover plate and the rear cover plate are located on both sides, the stacking plate is located in the middle, and the oil return plate is located between the stacking plate and the rear cover plate. Longitudinally arranged oil distribution grooves are provided on both sides of the stacking plate, and an oil return hole is provided in the middle position of the top. An oil collecting cavity covering the oil distribution grooves and the distribution positions of the oil return holes is provided in the oil return plate, and two oil inlet terminals connected to the oil distribution grooves are provided on the rear cover plate.

[0014] As a further solution of the present invention: the stator frame is equipped with an end cover fixed by bolts, and the front cover plate, the rear cover plate, the superposition plate and the oil return plate are compressed and sealed by locking the end cover.

[0015] As a further solution of the present invention: the iron core assembly is an integrated silicon steel core, an oil guide groove is provided in the silicon steel core, the oil guide groove is arranged close to the periphery of the silicon steel core, an oil return hole is provided inside for returning oil, and ports are provided at both the oil inlet and outlet ends.

[0016] As a further solution of the present invention: the iron core assembly is fixed on the oil separator seat, the iron core assembly is an integrated silicon steel core, an oil guide groove is provided in the silicon steel core, the oil guide groove is arranged close to the periphery of the silicon steel core, an oil return hole is provided inside to return oil, and a port connected to the oil guide groove and the oil return hole of the iron core assembly is provided on the oil separator seat.

[0017] As a further solution of the present invention: the port is divided into an oil inlet terminal and an oil return hole, the oil inlet terminal is connected to the oil cooler through an oil inlet pipeline, the oil return hole is connected to the oil inlet end of the micro oil pump through an oil discharge pipeline, and the oil outlet end of the micro oil pump is connected to the oil cooler to form a circulation.

[0018] As a further solution of the present invention: a filter plate is provided on the machine cover, one side of the oil cooler is fitted with the filter plate, a partition is provided inside the casing, the partition separates the cold oil area of ​​the oil cooler from the driving area of ​​the stator and the rotor, and the output shaft is fixed with a linkage shaft extending to the cold oil area, centrifugal fan blades are installed on the outside of the linkage shaft, and an air outlet hole is opened on the outside of the centrifugal fan blades.

[0019] As a further solution of the present invention: the outer sides of the output shaft and the linkage rotating shaft are respectively connected to the corresponding carriers through external bearings, and are equipped with labyrinth seals.

[0020] As a further solution of the present invention, the connection between the rotor and the output shaft is connected through an inclined guide plate, and the inclined guide plate drives the air flow to circulate during the rotation process.

[0021] As a further solution of the present invention: the oil cooler is provided with an oil port for exhausting air and changing oil, and the oil port is sealed by a bolt.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This high-voltage permanent magnet direct-drive stirring motor adopts outer rotor high-voltage direct-drive technology. The rotor part adopts a multi-pole surface-mount structure. The bottom of the rotor is equipped with a flange and a drive shaft. The drive shaft is directly connected to the stirring equipment. The stator part adopts a high-voltage formed coil to reduce the current and transmission pressure. The torque is generated by the interaction between the magnetic field of the rotor permanent magnet and the rotating magnetic field generated by the stator winding, thereby directly driving the stirring equipment.

[0024] 2. This high-voltage permanent magnet direct-drive stirring motor innovatively utilizes high-voltage direct-drive oil cooling technology. Oil circuits are provided between the rotor permanent magnets and the stator coils, as well as on the stator yoke. Direct contact of the cooling oil with the permanent magnets and coils improves the heat dissipation of the coils and magnets, thereby increasing the motor's power density and reducing its size.

[0025] 3. This high-voltage permanent magnet direct-drive stirring motor utilizes the closed space of the cup-shaped rotor structure to design a closed oil cooling path, avoiding the hidden danger of oil leakage caused by dynamic sealing problems, thereby eliminating product contamination during equipment operation and meeting food safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a high-voltage permanent magnet direct-drive stirring motor;

[0027] Figure 2 This is a schematic diagram of the oil circuit connection in a high-voltage permanent magnet direct-drive stirring motor;

[0028] Figure 3This is a schematic diagram of the silicon steel sheet assembly structure of the iron core assembly in a high-voltage permanent magnet direct-drive stirring motor;

[0029] Figure 4 This is an exploded diagram of the silicon steel sheet assembly structure of the iron core assembly in a high-voltage permanent magnet direct-drive stirring motor;

[0030] Figure 5 This is a schematic diagram of the structure of an integrated silicon steel core in a high-voltage permanent magnet direct-drive stirring motor;

[0031] Figure 6 This is a structural diagram of an oil separator in a high-voltage permanent magnet direct-drive stirring motor;

[0032] Figure 7 This is a structural schematic diagram of an inclined guide plate in a high-voltage permanent magnet direct-drive stirring motor.

[0033] In the figure: 1. Casing; 2. Machine cover; 3. Output shaft; 4. Base; 5. Inner bearing; 6. Stator frame; 7. Core assembly; 701. Front cover; 702. Rear cover; 703. Stacking plate; 704. Oil distribution groove; 705. Oil return hole; 706. Oil inlet terminal; 707. Oil collecting chamber; 708. Oil return plate; 8. Rotor; 9. End cover; 10. Filter plate; 11. Oil cooler; 12. Micro oil pump; 13. Partition; 14. Centrifugal fan blade; 15. Coil; 16. Linkage shaft; 17. Inclined guide plate; 18. Outer bearing; 19. Oil port; 20. Air outlet hole; 21. Oil inlet pipeline; 22. Oil discharge pipeline; 23. Oil distributor. DETAILED DESCRIPTION

[0034] See also Figures 1 to 7 In an embodiment of the present invention, a high-voltage permanent magnet direct-drive stirring motor includes a casing 1, a cover 2, an output shaft 3, a stator frame 6, a stator 7 and a rotor 8. The casing 1 is provided with a cover 2 tightly fixed by bolts, and the casing 1 is provided with an output shaft 3, a stator frame 6, a stator 7 and a rotor 8. The stator frame 6 is fixed to the casing 1 through a base 4, and the stator frame 6 is rotatably connected to the output shaft 3 through an inner bearing 5. An iron core assembly 7 is installed on the outside of the stator frame 6, and a coil 15 is wound around the outside of the iron core assembly 7. A permanent magnet located on the outside of the iron core assembly 7 is installed inside the rotor 8. In the present invention, the motor adopts an outer rotor 8 high-voltage direct drive technology, and the rotor 8 adopts a multi-pole surface-mounted structure. The bottom of the rotor 8 is directly connected to the output shaft 3, and the output shaft 3 is directly connected to the stirring equipment. The stator 7 adopts a high-pressure formed coil 15, thereby reducing the current and transmission pressure, and the torque is generated by the interaction between the magnetic field of the permanent magnet of the rotor 8 and the rotating magnetic field generated by the stator winding, thereby directly driving the stirring equipment.

[0035] An oil cooler 11 and a micro oil pump 12 are installed in the cover 2. An oil guide groove is opened in the core assembly 7. The coolant in the oil cooler 11 circulates in the oil guide groove of the core assembly 7 through the micro oil pump 12. The present invention innovatively adopts high-voltage direct-drive oil cooling technology. Oil circuits are set between the permanent magnets of the rotor 8 and the formed coils of the stator 7 and on the yoke of the stator 7. The direct contact between the cooling oil and the permanent magnets and the formed coils improves the heat dissipation capacity of the formed coils and permanent magnets, thereby improving the power density of the motor and reducing the size of the motor.

[0036] The present invention utilizes the closed space of the cup-shaped rotor structure to design a closed oil cooling path, avoiding the hidden danger of oil leakage caused by dynamic sealing problems, thereby eliminating product contamination during equipment operation and meeting food safety requirements.

[0037] In a preferred embodiment, the core assembly 7 is composed of silicon steel sheets stacked on each other, and the silicon steel sheets include a front cover plate 701, a rear cover plate 702, a stacking plate 703 and an oil return plate 708. The front cover plate 701 and the rear cover plate 702 are located on both sides, the stacking plate 703 is located in the middle, and the oil return plate 708 is located between the stacking plate 703 and the rear cover plate 702. A longitudinally arranged oil distribution groove 704 is provided on both sides of the stacking plate 703, an oil return hole 705 is provided in the middle of the top, and an oil return plate 708 is provided inside. An oil collecting chamber 707 is provided to cover the oil distribution groove 704 and the oil return hole 705. Two oil inlet terminals 706 connected to the oil distribution groove 704 are provided on the rear cover 702. Different types of oil circuits need to be opened according to different core styles. The oil circuits need to be as close to the coil 15 as possible for better heat exchange. The silicon steel sheets are combined to have a length that can better adapt to the use of motors of various specifications. The silicon steel sheets are tightly connected by pressing and coating to minimize oil leakage and improve sealing.

[0038] In a preferred embodiment, the stator frame 6 is equipped with an end cover 9 fixed by bolts. The front cover plate 701, the rear cover plate 702, the stacking plate 703 and the oil return plate 708 are compressed and sealed by locking the end cover 9. The end cover 9 serves to increase the pressure and improve the sealing between the silicon steel sheets.

[0039] In a preferred embodiment, the core assembly 7 is an integrated silicon steel core, and an oil guide groove is provided inside the silicon steel core. The oil guide groove is arranged close to the periphery of the silicon steel core, and an oil return hole 705 is provided inside for oil return. Ports are provided at both the oil inlet and the oil outlet. The oil guide groove provided inside the integrated silicon steel core will have better sealing performance.

[0040] In a preferred embodiment, the core assembly 7 is fixed on the oil separator 23. The core assembly 7 is an integrated silicon steel core. An oil guide groove is provided in the silicon steel core. The oil guide groove is arranged close to the periphery of the silicon steel core. An oil return hole 705 is provided inside to return oil. A port communicating with the oil guide groove of the core assembly 7 and the oil return hole 705 is provided on the oil separator 23. The technical solution of the invention can be used corresponding to different motor coil arrangements.

[0041] In a preferred embodiment, the port is divided into an oil inlet terminal 706 and an oil return hole 705. The oil inlet terminal 706 is connected to the oil cooler 11 through an oil inlet pipeline 21. The oil return hole 705 is connected to the oil inlet end of the micro oil pump 12 through an oil discharge pipeline 22. The oil outlet end of the micro oil pump 12 is connected to the oil cooler 11 to form a circulation. The present invention provides power for the circulation of cooling oil by extracting through the micro oil pump 12, and at the same time generates negative pressure in the oil circuit to avoid leakage of cooling oil due to positive pressure in the oil circuit, causing food contamination.

[0042] In a preferred embodiment, a filter plate 10 is provided on the cover 2, one side of the oil cooler 11 is fitted with the filter plate 10, a partition 13 is provided inside the casing 1, the partition 13 separates the cold oil area of ​​the oil cooler 11 from the drive area of ​​the stator 7 and the rotor 8, and the output shaft 3 is fixed with a linkage shaft 16 extending to the cold oil area, a centrifugal fan blade 14 is installed on the outside of the linkage shaft 16, and an air outlet hole 20 is opened on the casing 1 located on the outside of the centrifugal fan blade 14. The oil cooler 11 is a prior art, and the oil cooler 11 can be a plate type oil cooler. Its heat dissipation principle is also through heat exchange. Therefore, the oil cooler 11 is arranged on the machine cover 2 and in contact with the outside air. During the driving process of the equipment, the output shaft 3 will drive the linkage shaft 16 to rotate together. The diameter of the linkage shaft 16 is smaller than the diameter of the output shaft 3. This can reduce the size of the sealing area. The linkage shaft 16 drives the centrifugal fan blades 14 to rotate, and the air flow is discharged from the air outlet holes 20 through centrifugal force. Negative pressure is generated in the machine cover 2, and air enters the gap of the oil cooler 11 for heat exchange, forming an external air circulation, which accelerates the cooling speed of the cooling oil.

[0043] In a preferred embodiment, the outer sides of the output shaft 3 and the linkage shaft 16 are respectively connected to the corresponding carriers through external bearings 18, and are equipped with labyrinth seals. The cold oil area of ​​the oil cooler 11 is separated from the driving area of ​​the stator 7 and the rotor 8 by the partition 13. The labyrinth seal and the external bearing 18 can effectively improve the sealing performance, prevent external dust or water from entering the driving area, and improve the operating stability and safety of the equipment.

[0044] In a preferred embodiment, the connection between the rotor 8 and the output shaft 3 is connected through an inclined guide plate 17. The inclined guide plate 17 drives the air circulation during rotation, circulates the internal airflow to the outside, contacts the casing 1, and dissipates heat through the heat sink on the casing 1. During the circulation process, the airflow around the coil 15 can be dredged to the outside of the rotor 8, thereby improving the heat dissipation efficiency of the equipment.

[0045] In a preferred embodiment, the oil cooler 11 is provided with an oil port 19 for exhaust and oil change. The oil port 19 is sealed by bolts. Since the cooling oil is extracted and circulated under negative pressure, there is a probability that gas will enter the oil circuit. The cooling oil reserve and the amount of air are checked in a fixed period, and the cooling oil is exhausted or replaced and filled through the oil port 19.

[0046] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For any details not described in individual embodiments, reference may be made to the description in other embodiments.

[0047] The above-described embodiments merely illustrate the implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A high-voltage permanent magnet direct-drive stirring motor, comprising a housing (1), a cover (2), an output shaft (3), a stator frame (6), a stator and a rotor (8), wherein the housing (1) is provided with a cover (2) tightly fixed by bolts, and the housing (1) is provided with an output shaft (3), a stator frame (6), a stator and a rotor (8), characterized in that: The stator frame (6) is fixed to the housing (1) via the base (4), the stator frame (6) is rotatably connected to the output shaft (3) via the inner bearing (5), an iron core assembly (7) is installed on the outside of the stator frame (6), a coil (15) is wound around the outside of the iron core assembly (7), and a permanent magnet located on the outside of the iron core assembly (7) is installed inside the rotor (8); An oil cooler (11) and a micro oil pump (12) are installed in the engine cover (2), an oil guide groove is provided in the core assembly (7), and the coolant in the oil cooler (11) circulates in the oil guide groove of the core assembly (7) through the micro oil pump (12); The port is divided into an oil inlet terminal (706) and an oil return hole (705), the oil inlet terminal (706) is connected to the oil cooler (11) through an oil inlet pipeline (21), the oil return hole (705) is connected to the oil inlet end of the micro oil pump (12) through an oil discharge pipeline (22), and the oil outlet end of the micro oil pump (12) is connected to the oil cooler (11) to form a circulation; The cover (2) is provided with a filter plate (10), one side of the oil cooler (11) is fitted with the filter plate (10), a partition (13) is provided inside the housing (1), the partition (13) separates the cold oil area of ​​the oil cooler (11) from the drive area of ​​the stator and the rotor (8), and the output shaft (3) is fixed with a linkage shaft (16) extending to the cold oil area, the outer side of the linkage shaft (16) is installed with a centrifugal fan blade (14), and the housing (1) is provided with an air outlet hole (20) located on the outer side of the centrifugal fan blade (14).

2. A high-voltage permanent magnet direct-drive stirring motor according to claim 1, characterized in that: The core assembly (7) is composed of silicon steel sheets stacked on each other, and the silicon steel sheets include a front cover plate (701), a rear cover plate (702), a stacking plate (703) and an oil return plate (708). The front cover plate (701) and the rear cover plate (702) are located on both sides, the stacking plate (703) is located in the middle, and the oil return plate (708) is located between the stacking plate (703) and the rear cover plate (702). The stacking plate (703) is provided with longitudinally arranged oil distribution grooves (704) on both sides, and an oil return hole (705) is provided in the middle of the top. An oil collecting cavity (707) covering the distribution positions of the oil distribution grooves (704) and the oil return holes (705) is provided in the oil return plate (708). Two oil inlet terminals (706) connected to the oil distribution grooves (704) are provided on the rear cover plate (702).

3. A high-voltage permanent magnet direct-drive stirring motor according to claim 2, characterized in that: The stator frame (6) is equipped with an end cover (9) fixed by bolts, and the front cover plate (701), the rear cover plate (702), the superimposed plate (703) and the oil return plate (708) are compressed and sealed by locking the end cover (9).

4. A high-voltage permanent magnet direct-drive stirring motor according to claim 1, characterized in that: The iron core assembly (7) is an integrated silicon steel core, an oil guide groove is provided in the silicon steel core, the oil guide groove is arranged close to the periphery of the silicon steel core, an oil return hole (705) is provided inside for oil return, and ports are provided at both the oil inlet and the oil outlet.

5. A high-voltage permanent magnet direct-drive stirring motor according to claim 1, characterized in that: The iron core assembly (7) is fixed on the oil distribution seat (23). The iron core assembly (7) is an integrated silicon steel core. An oil guide groove is provided in the silicon steel core. The oil guide groove is arranged close to the periphery of the silicon steel core. An oil return hole (705) is provided inside for returning oil. A port is provided on the oil distribution seat (23) that is connected to the oil guide groove of the iron core assembly (7) and the oil return hole (705).

6. A high-voltage permanent magnet direct-drive stirring motor according to claim 1, characterized in that: The outer sides of the output shaft (3) and the linkage rotating shaft (16) are respectively connected to corresponding carriers via outer bearings (18) and are provided with labyrinth seals.

7. A high-voltage permanent magnet direct-drive stirring motor according to claim 1, characterized in that: The connection between the rotor (8) and the output shaft (3) is connected via an inclined guide plate (17), and the inclined guide plate (17) drives the air flow to circulate during the rotation process.

8. The high-voltage permanent magnet direct-drive stirring motor according to claim 1, characterized in that: The oil cooler (11) is provided with an oil port (19) for exhausting air and changing oil, and the oil port (19) is sealed by a bolt.

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