Direct drive device of marine permanent magnet motor

Abstract

The utility model relates to a direct drive device of a marine permanent magnet motor. The direct drive device comprises a shaft, a conducting ring, a front bearing outer cover, a cylindrical roller bearing, a deep groove ball bearing, an end cover, a bearing inner cover, a bearing sleeve, a rear bearing outer cover, a round nut, a rotary transformer, a protruding panel type flat welding steel flange, a bearing support and a machine base. According to the utility model, the mechanical strength is ensured; effective heat dissipation of the motor is facilitated; the deep groove ball bearing arranged on the shaft in advance is effectively protected from being extruded, so that the bearing clearance is prevented from being damaged; the problem that a rotor part needs to be effectively supported when the cylindrical roller bearing is assembled is effectively solved; the later maintenance of the motor is facilitated; the generation of shaft current is effectively isolated and inhibited; the service life and the safe working period of the whole motor are prolonged by a double-insurance bearing insulation structure; therefore, the motor can bear the impact load of the MW-level direct-drive permanent magnet rotor.

Description

Technical Field

[0001] This utility model relates to the field of marine permanent magnet motor technology, specifically to structural components of a marine direct-drive permanent magnet synchronous motor. Background Technology

[0002] Aiming at the national "dual-carbon" strategy and the green and low-carbon development needs of the Yangtze River shipping industry, and accelerating the implementation of the Yangtze River Shipping Group's "dual-carbon" strategy special plan and "one enterprise, one policy" approach, the primary goal is to support the improvement of the economy and safety of Yangtze River vessels with the technological advantages of new power systems. Based on the functional requirements and operating environment characteristics of Yangtze River vessels, research on integrated electric propulsion systems is being conducted to determine the optimal overall scheme for ship electric propulsion systems. Typical marine direct-drive permanent magnet motors are being developed and standardized product lines are being established. This will comprehensively enhance the overall innovation and R&D design capabilities and key equipment manufacturing capabilities of the Yangtze River Shipping Group, strengthen the company's core competitiveness, and continuously lead the high-quality development of Yangtze River shipping. Marine direct-drive permanent magnet motors will become the development direction of green power systems for inland waterway vessels in my country. This practical marine direct-drive permanent magnet motor has no reduction gearbox, directly drives the propeller, and propels 10,000-ton Yangtze River vessels, achieving optimized matching between ship, engine, and propeller. It supports energy saving, consumption reduction, and efficiency improvement for Yangtze River vessels, and has advantages such as low-speed high torque, high efficiency, high power factor, low vibration, and low noise. The marine direct-drive permanent magnet motor uses built-in permanent magnets with an excellent magnetic circuit structure and good field weakening speed regulation capability. Currently, commercial ships are powered by main propulsion diesel engines, with diesel generator sets supplying electricity to the entire ship. This presents problems such as large peak capacity, power quality stability, and safety and reliability. Marine direct-drive permanent magnet motors have replaced diesel engine propulsion motors, enabling low-speed navigation. This is more conducive to energy conservation and emission reduction, saving transportation costs and contributing to the sustainable development of shipping companies.

[0003] The shortcomings of existing technology are:

[0004] 1. The lack of bearing sleeves makes bearing installation inconvenient; the use of a single conductive ring structure poses a safety hazard in terms of shaft current discharge; and a single bearing at the front and rear cannot withstand the impact of large load torque.

[0005] 2. Without a bearing bracket, when repairing the motor, after removing the end cover, the stator and rotor will stick together, making it impossible to replace the bearing.

[0006] 3. The existing end caps do not have magnetic isolation holes for assembly. When the stator and rotor are assembled, they will also stick together, making it impossible to complete the later assembly.

[0007] 4. Existing end caps without reinforcing ribs may deform under high stress, leading to vibration or sealing failure, and the motor is not easy to dissipate heat. Summary of the Invention

[0008] This utility model addresses the aforementioned problems by providing structural components for a marine direct-drive permanent magnet synchronous motor. Its purpose is to ensure mechanical strength; facilitate effective heat dissipation for the motor; effectively protect the pre-installed deep groove ball bearings on the shaft from compression, thus preventing damage to the bearing clearance; effectively solve the problem of effective support for rotor components during cylindrical roller bearing assembly; facilitate subsequent motor maintenance and repair; effectively isolate and suppress shaft current generation; ensure bearing safety; and extend the overall lifespan and safe operating cycle of the motor through a double-layered bearing insulation structure. Furthermore, it enables the motor to withstand the impact loads of a MW-level direct-drive permanent magnet rotor.

[0009] To solve the above problems, the technical solution provided by this utility model is as follows:

[0010] The direct drive unit of a marine permanent magnet motor includes a shaft, conductive ring, front bearing outer cover, cylindrical roller bearing, deep groove ball bearing, end cover, bearing inner cover, bearing sleeve, rear bearing outer cover, round nut, rotary transformer, raised-panel flat-welded steel flange, bearing bracket, and base, wherein:

[0011] The conductive ring is installed on the outside of the front bearing outer cover; the cylindrical roller bearing is provided at the motor load shaft extension end near the front bearing outer cover; the deep groove ball bearing is provided near the bearing inner cover; the cylindrical roller bearing is provided at the non-load end near the bearing inner cover; both the front bearing outer cover and the rear bearing outer cover are provided with oil inlet and outlet pipes; the bearing inner cover is provided with an oil storage groove; the rotary transformer is installed on the outside of the rear bearing outer cover; the bearing sleeve is installed on the outer ring of the front bearing outer cover and the outer ring of the rear bearing outer cover; the outer ring of the bearing sleeve mates with the bearing seat inner ring of the end cover; the cylindrical roller bearing has a round nut at its front end, which is rotatably positioned on the shaft; the front and rear ends of the side of the machine base are each provided with a protruding plate-type flat welded steel flange for the user to connect the motor cooling water inlet and outlet pipes; the front and rear ends of the inner side of the bearing inner cover are each provided with a bearing bracket.

[0012] Preferably, four first reinforcing ribs are evenly distributed on the inner side of the end cap in the directions of 0 degrees, 90 degrees, 180 degrees, and 270 degrees.

[0013] Preferably, the width of the first reinforcing rib is 30mm to 50mm.

[0014] Preferably, four second reinforcing ribs are evenly distributed on the inner side of the end cap in the directions of 45 degrees, 135 degrees, 225 degrees, and 315 degrees.

[0015] Preferably, the width of the second reinforcing rib is 12mm to 18mm.

[0016] Preferably, four sets of third reinforcing ribs are evenly distributed on the outer side of the end cap in the directions of 45 degrees, 135 degrees, 225 degrees, and 315 degrees.

[0017] Preferably, each of the third reinforcing rib groups is an inverted triangular structure composed of 5 third reinforcing ribs; the width of each third reinforcing rib is 6mm to 8mm.

[0018] Preferably, four sets of fourth reinforcing ribs are evenly distributed on the outer side of the end cap in the directions of 0 degrees, 90 degrees, 180 degrees, and 270 degrees.

[0019] Preferably, each of the fourth reinforcing rib groups is a columnar structure composed of five parallel fourth reinforcing ribs; the spacing between each fourth reinforcing rib is 30mm to 40mm, and the width is 6mm to 8mm.

[0020] Preferably, the end cap has eight magnetic isolation holes evenly distributed along the circumference, which are used to insert magnetic isolation strips into the air gap when the stator and rotor are assembled.

[0021] Compared with the prior art, this utility model has the following advantages:

[0022] 1. The inner and outer reinforcing ribs of the end cap of this utility model ensure mechanical strength, and the outer reinforcing ribs can also help the motor to dissipate heat effectively.

[0023] 2. The magnetic isolation hole and magnetic isolation strip structure of this utility model can prevent the strong magnetic force of the permanent magnet rotor from attracting the stator core to each other, and also effectively protect the deep groove ball bearing pre-installed on the shaft from being squeezed, so as to avoid damaging the bearing clearance.

[0024] 3. The circumferentially distributed magnetic shielding strips of this utility model can effectively solve the problem of effective support for rotor components during the assembly of cylindrical roller bearings.

[0025] 4. The bearing bracket of this utility model supports the entire rotor assembly, preventing the stator and rotor from attracting each other. The abnormal bearing can be directly replaced from the shaft, and the rotor assembly does not need to be removed from the stator core, which facilitates the maintenance and repair of the motor in the future.

[0026] 5. The bearing sleeve and bearing contact surface of this utility model adopt a polymer electroplated insulating layer, thereby effectively isolating and suppressing the generation of shaft current.

[0027] 6. The bearing cover of this utility model is inlaid with a conductive ring. As a safety discharge device, the conductive ring is used to divert the shaft current and discharge it to the ground, thereby preventing the shaft current from flowing through the bearing and ensuring the safety of the bearing. The double-protection bearing insulation structure extends the life of the entire motor and the safe working cycle.

[0028] 7. The entire motor bearing adopts a two-column, one-ball structure, with a deep groove ball bearing and a cylindrical roller bearing at the load end, and a cylindrical roller bearing at the rear end, which can withstand the impact load of a MW-level direct-drive permanent magnet rotor. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structural components assembly structure of a marine direct-drive permanent magnet synchronous motor according to a specific embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the inner structure of the end cap according to a specific embodiment of the present utility model;

[0031] Figure 3 This is a schematic diagram of the outer structure of the end cap according to a specific embodiment of the present utility model;

[0032] Figure 4 This is a schematic diagram of the end cap and magnetic strip installation structure according to a specific embodiment of the present invention;

[0033] Figure 5a This is a schematic front view of a bearing bracket according to a specific embodiment of the present utility model;

[0034] Figure 5b This is a cross-sectional schematic diagram of a specific embodiment of the bearing bracket of this utility model;

[0035] Figure 5c This is a side view schematic diagram of a bearing bracket according to a specific embodiment of the present utility model.

[0036] The components include: 1. Shaft, 2. Conductive ring, 3. Front bearing outer cover, 4. Cylindrical roller bearing, 5. Deep groove ball bearing, 6. End cover, 9. Bearing inner cover, 10. Bearing sleeve, 11. Rear bearing outer cover, 12. Round nut, 13. Rotary transformer, 14. Raised-panel flat-welded steel flange, 15. Bearing bracket, 16. Machine base, 501. First reinforcing rib, 502. Second reinforcing rib, 503. Third reinforcing rib group, 503a. Third reinforcing rib, 504. Fourth reinforcing rib group, 504a. Fourth reinforcing rib, 505. Magnetic shielding hole, 506. Magnetic shielding strip. Detailed Implementation

[0037] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0038] like Figure 1 As shown, the direct drive unit of the marine permanent magnet motor includes a shaft 1, a conductive ring 2, a front bearing outer cover 3, a cylindrical roller bearing 4, a deep groove ball bearing 5, an end cover 6, a bearing inner cover 9, a bearing sleeve 10, a rear bearing outer cover 11, a round nut 12, a rotary transformer 13, a raised-panel flat-welded steel flange 14, a bearing bracket 15, and a base 16, wherein:

[0039] Conductive ring 2 is installed on the outside of front bearing outer cover 3; a cylindrical roller bearing 4 is provided near the front bearing outer cover 3 at the motor load shaft extension end; a deep groove ball bearing 5 is provided near the bearing inner cover 9; a cylindrical roller bearing 4 is provided near the bearing inner cover 9 at the non-load end; both the front bearing outer cover 3 and the rear bearing outer cover 11 are provided with oil inlet and outlet pipes; the bearing inner cover 9 is provided with an oil storage groove; a rotary transformer 13 is installed on the outside of the rear bearing outer cover 11; a bearing sleeve 10 is installed on the outer ring of the front bearing outer cover 3 and the outer ring of the rear bearing outer cover 11; the outer ring of the bearing sleeve 10 mates with the bearing seat inner ring of the end cover 6; a round nut 12 is provided at the front end of the cylindrical roller bearing 4 and is rotatably positioned on the shaft 1; a raised panel type flat welded steel flange 14 for users to connect the inlet and outlet water pipes for motor cooling is provided at the front and rear ends of the side of the machine base 16; a bearing bracket 15 is provided at the front and rear ends of the inner side of the bearing inner cover 9.

[0040] In this specific embodiment, the end cap 6 has a wall thickness of 20mm.

[0041] like Figure 2 , 3 As shown, it should be noted that there are four first reinforcing ribs 501 evenly distributed in the 0°, 90°, 180° and 270° directions on the inner side of the end cap 6.

[0042] In this specific embodiment, the width of the first reinforcing rib 501 is 40mm.

[0043] It should be further explained that there are four second reinforcing ribs 502 evenly distributed in the 45-degree, 135-degree, 225-degree and 315-degree directions on the inner side of the end cap 6.

[0044] In this specific embodiment, the width of the second reinforcing rib 502 is 15mm.

[0045] It should be further explained that there are four groups of third reinforcing ribs 503 evenly distributed on the outer side of the end cap 6 in the directions of 45 degrees, 135 degrees, 225 degrees and 315 degrees.

[0046] In this specific embodiment, each third reinforcing rib group 503 is an inverted triangular structure composed of 5 third reinforcing ribs 503a; the width of each third reinforcing rib 503a is 6mm.

[0047] It should be further explained that there are four groups of fourth reinforcing ribs 504 evenly distributed on the outer side of the end cap 6 in the directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees.

[0048] In this specific embodiment, each fourth reinforcing rib group 504 is a columnar structure composed of five parallel fourth reinforcing ribs 504a; the spacing between each fourth reinforcing rib 504a is 40mm and the width is 6mm.

[0049] It should be further explained that there are 8 magnetic isolation holes 505 evenly distributed along the circumference of the end cover 6, which are used to insert magnetic isolation strips 506 into the air gap when the stator and rotor are assembled.

[0050] like Figure 4 , Figure 5a , 5b As shown in Figure 5c, it should be noted that the inner and outer reinforcing ribs of the end cover 6 ensure mechanical strength, while the outer reinforcing ribs also help the motor to effectively dissipate heat. The end cover 6 has eight magnetic isolation holes 505 distributed around its circumference, facilitating the insertion of magnetic isolation strips 506 into the air gap during stator and rotor assembly. The thickness of the magnetic isolation strips 506 is slightly less than the motor's air gap by 1mm. During end cover 6 assembly, the rotor's set screw holes need to be temporarily removed. Inserting the magnetic isolation strips 506 into the air gap beforehand prevents the strong magnetic force of the permanent magnet rotor from attracting it to the stator core, and also effectively protects the deep groove ball bearings 5 ​​pre-installed on the shaft from compression, preventing damage to the bearing clearance. Since the cylindrical roller bearings 4 are separable bearings, effective support for the rotor components is even more crucial during assembly. The circumferentially distributed magnetic isolation strips 506 precisely solve the above problems. After the end covers 6 are assembled, the eight magnetic isolation strips 506 are removed from the magnetic isolation holes 505 and finally sealed with metal caps. These become internal inspection holes after the motor is put into service. The bearing bracket 15 is a maintenance device. When a bearing malfunctions and needs replacement, after removing the front or rear cover 6, the bearing bracket 15 supports the entire rotor assembly, preventing the stator and rotor from attracting each other. The malfunctioning bearing can be directly replaced from the shaft without removing the rotor assembly from the stator core, facilitating future motor maintenance and repair. After replacing the bearing, the upper cover 6 and bearing sleeve 10 are installed. The inner ring of the bearing bracket 15 is in clearance fit with the shaft 1 and does not function during normal motor operation. Both front and rear bearings have bearing sleeves 10 in the radial direction for easy assembly, and round nuts are provided in the axial direction to prevent axial movement. The contact surface between the bearing sleeve 10 and the bearing is made of a high-polymer electroplated insulating layer, effectively isolating and suppressing the generation of shaft current. The outer cover of the bearing is inlaid with a conductive ring 2, which acts as a safety discharge device. Its function is to divert shaft current and discharge it to the ground, thereby preventing shaft current from flowing through the bearing and ensuring bearing safety. This double-protection bearing insulation structure extends the life of the entire motor and its safe operating cycle. Both the front bearing outer cover 3 and the rear bearing outer cover 11 have oil injection and drainage holes, and the inner cover has an oil storage groove; the rear bearing outer cover 11 is equipped with a rotary transformer 13 at the tail end, which facilitates the detection and protection of the motor. The entire motor bearing adopts a two-column and one-ball structure, with a deep groove ball bearing 5 and a cylindrical roller bearing 4 at the load end, and a cylindrical roller bearing 4 at the rear end, which can withstand the impact load of a MW-level direct-drive permanent magnet rotor.

[0051] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the disclosed individual embodiments. Therefore, the appended claims are hereby clearly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.

[0052] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0053] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0054] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A direct drive device of a marine permanent magnet motor, characterized in that: Includes a shaft (1), a conductive ring (2), a front bearing outer cover (3), a cylindrical roller bearing (4), a deep groove ball bearing (5), an end cover (6), a bearing inner cover (9), a bearing sleeve (10), a rear bearing outer cover (11), a round nut (12), a rotary transformer (13), a raised-panel flat-welded steel flange (14), a bearing bracket (15), and a machine base (16), wherein: The conductive ring (2) is installed on the outside of the front bearing outer cover (3); the cylindrical roller bearing (4) is provided at the motor load shaft extension end near the front bearing outer cover (3); the deep groove ball bearing (5) is provided at the load end near the bearing inner cover (9); the cylindrical roller bearing (4) is provided at the non-load end near the bearing inner cover (9); both the front bearing outer cover (3) and the rear bearing outer cover (11) are provided with oil inlet and outlet pipes; the bearing inner cover (9) is provided with an oil storage groove; the rotary transformer (13) is installed on the outside of the rear bearing outer cover (11); the The outer ring of the front bearing outer cover (3) and the outer ring of the rear bearing outer cover (11) are fitted with the bearing sleeve (10); the outer ring of the bearing sleeve (10) is engaged with the bearing seat inner ring of the end cover (6); the front end of the cylindrical roller bearing (4) is provided with the round nut (12), which is rotatably positioned on the shaft (1); the front and rear ends of the side of the machine base (16) are each provided with a protruding plate type flat welded steel flange (14) for users to connect the inlet and outlet water pipes for motor cooling; the front and rear ends of the inner side of the bearing inner cover (9) are each provided with a bearing bracket (15).

2. The direct drive device of the marine permanent magnet motor according to claim 1, characterized in that: Four first reinforcing ribs (501) are evenly distributed on the inner side of the end cap (6) in the directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees.

3. The direct drive device of the marine permanent magnet motor according to claim 2, characterized in that: The width of the first reinforcing rib (501) is 30mm to 50mm.

4. The direct drive device of the marine permanent magnet motor according to claim 3, characterized in that: Four second reinforcing ribs (502) are evenly distributed on the inner side of the end cap (6) in the directions of 45 degrees, 135 degrees, 225 degrees and 315 degrees.

5. The direct drive device of the marine permanent magnet motor according to claim 4, characterized in that: The width of the second reinforcing rib (502) is 12mm to 18mm.

6. The direct drive device of the marine permanent magnet motor according to claim 5, characterized in that: Four sets of third reinforcing ribs (503) are evenly distributed on the outer side of the end cap (6) in the directions of 45 degrees, 135 degrees, 225 degrees and 315 degrees.

7. The direct drive device of a marine permanent magnet electric machine according to claim 6, characterized in that: Each of the third reinforcing rib groups (503) is an inverted triangular structure composed of 5 third reinforcing ribs (503a); the width of each third reinforcing rib (503a) is 6mm to 8mm.

8. The direct drive device of a marine permanent magnet electric machine according to claim 7, characterized in that: Four sets of fourth reinforcing ribs (504) are evenly distributed on the outer side of the end cap (6) in the directions of 0 degrees, 90 degrees, 180 degrees and 270 degrees.

9. The direct drive device of a marine permanent magnet electric machine according to claim 8, characterized in that: Each of the fourth reinforcing rib groups (504) is a columnar structure composed of five parallel fourth reinforcing ribs (504a); the spacing between each fourth reinforcing rib (504a) is 30mm to 40mm, and the width is 6mm to 8mm.

10. The direct drive device of a marine permanent magnet electric machine according to claim 9, characterized in that: The end cap (6) has eight magnetic isolation holes (505) evenly distributed along the circumference, which are used to insert magnetic isolation strips (506) into the air gap when the stator and rotor are assembled.

Images