Semi-direct-drive permanent magnet motor

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a semi-direct-drive permanent magnet motor which comprises a permanent magnet motor and a planetary gear box, the permanent magnet motor and the planetary gear box are connected through an outer gear sleeve, an inner gear sleeve and a connecting shell, and the connecting shell is connected between the permanent magnet motor and the planetary gear box. A motor shaft of the permanent magnet motor is connected with an outer gear sleeve, the outer gear sleeve is sleeved with an inner gear sleeve, the inner gear sleeve is rotationally connected into a connecting shell, the inner gear sleeve is connected with a sun gear, closest to the permanent magnet motor, in the planetary gearbox, and a sealing device is arranged between the connecting shell and the permanent magnet motor. The permanent magnet motor and the sun gear are connected through the outer gear sleeve and the inner gear sleeve, when the spline connection position is abraded, the abraded parts are changed into the inner gear sleeve and the outer gear sleeve, damage to a motor shaft is reduced, the service life of the motor is prolonged, only the inner gear sleeve and the outer gear sleeve need to be replaced when replacement is needed, and maintenance cost is lower.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a semi-direct drive permanent magnet motor. Background Technology

[0002] Semi-direct drive permanent magnet drives are widely used in metallurgy, mining, hoisting and transportation, petrochemicals, wind power generation, cement, and building materials industries. Their high operating efficiency, lightweight design, intelligent control, and load-start capability have led to their increasingly widespread application.

[0003] In existing permanent magnet motors, the motor shaft and sun gear are typically connected directly via splines when connected to the gearbox. However, under heavy loads and frequent forward and reverse rotation, wear at the spline connection is inevitable, directly causing wear on the motor shaft. Furthermore, motor bearings are usually grease-lubricated. With the motor and sun gear directly connected via splines, if the oil seal at the motor output end fails, lubricating oil from the gearbox will enter the motor bearings, leading to motor failure, and the oil leak cannot be detected. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a semi-direct drive permanent magnet motor that reduces wear on the motor shaft, extends the motor's service life, and lowers maintenance costs.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a semi-direct drive permanent magnet motor, including a permanent magnet motor and a planetary gearbox, wherein the permanent magnet motor and the planetary gearbox are connected by an outer gear sleeve, an inner gear sleeve and a connecting housing, the connecting housing being connected between the permanent magnet motor and the planetary gearbox, the motor shaft of the permanent magnet motor being connected to the outer gear sleeve, the inner gear sleeve being fitted outside the outer gear sleeve, the inner gear sleeve being rotatably connected inside the connecting housing, the inner gear sleeve being connected to the sun gear of the planetary gearbox closest to the permanent magnet motor, and a sealing device being provided between the connecting housing and the permanent magnet motor.

[0006] Preferably, the motor shaft of the permanent magnet motor and the outer gear sleeve are connected by a double flat key, with the two flat keys arranged 180° apart circumferentially.

[0007] Preferably, the inner gear sleeve and the outer gear sleeve are connected by a spline, and the inner gear sleeve and the sun gear are also connected by a spline.

[0008] Preferably, a leak detection plug is provided on the connecting housing, and the leak detection plug is made of transparent material.

[0009] Preferably, the leak detection plug is made of plexiglass.

[0010] Preferably, a cooling assembly is provided between the permanent magnet motor and the planetary gearbox.

[0011] Preferably, the cooling component is a water-cooled coil, the planetary gearbox is connected to the connecting housing via an intermediate flange, the water-cooled coil is fixedly installed on the side of the intermediate flange near the connecting housing, the water-cooled coil is arranged around the inner gear sleeve, and the water inlet and outlet of the water-cooled coil are both located on the intermediate flange.

[0012] Preferably, the planetary gearbox is a single-stage planetary gearbox, which includes a sun gear, planet gears, an internal gear ring, a planet carrier, and an output flange. The internal gear ring is installed between the intermediate flange and the output flange. The intermediate flange is connected to the connecting housing. The planet gears mesh in the internal gear ring. The sun gear meshes with the planet gears. The planet gears are installed on the planet carrier. The planet carrier is installed on the intermediate flange and the output flange. An output shaft is integrally provided on the side of the planet carrier away from the permanent magnet motor.

[0013] Preferably, a sealing device is also provided on the side of the output flange near the output shaft.

[0014] Preferably, the sealing device is a double-frame oil seal.

[0015] Preferably, the outer gear sleeve is made of 18CrNiMo7-6 material and is subjected to carburizing and quenching treatment, while the inner gear sleeve is made of 42CrMo material and is subjected to nitriding treatment.

[0016] Compared with existing technologies, the above technical solution has the following beneficial effects:

[0017] 1. This utility model connects the permanent magnet motor and the planetary gearbox via an outer gear sleeve, an inner gear sleeve, and a connecting housing. The outer and inner gear sleeves connect the motor shaft and the sun gear of the permanent magnet motor. Under heavy load and frequent forward and reverse operation, when wear occurs at the spline connection, the worn parts become the inner and outer gear sleeves, reducing damage to the motor shaft and extending the service life of the motor. When replacement is needed, only the inner and outer gear sleeves need to be replaced, resulting in lower maintenance costs. Furthermore, when lubricating oil leaks from the planetary gearbox, it leaks into the inner and outer gear sleeves instead of directly into the permanent magnet motor, avoiding motor failure.

[0018] 2. Setting a leak test plug can detect whether the oil seal at the input end of the planetary gearbox has failed during operation. When lubricating oil appears in the leak test plug, it indicates that the oil seal has failed and maintenance is required. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the water-cooled coil structure.

[0021] The components include: 1. Permanent magnet motor; 2. Input flange; 3. Water-cooled coil; 4. Intermediate flange; 5. Internal gear ring; 6. Output flange; 7. Planetary carrier; 8. External gear sleeve; 9. Internal gear sleeve; 10. Sun gear; 11. Planetary gear; 12. Planetary gear bearing; 13. Leakage plug; 14. Output shaft; 15. Internal gear sleeve bearing; 16. Pipe clamp; 17. Water outlet; 18. Water inlet; 19. Compression fitting; 20. Connecting hole. Detailed Implementation

[0022] Figures 1-2 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-2 The present invention will be further described below.

[0023] like Figure 1 As shown, this utility model discloses a semi-direct drive permanent magnet motor, including a permanent magnet motor 1 and a planetary gearbox. The permanent magnet motor 1 and the planetary gearbox are connected by an outer gear sleeve 8, an inner gear sleeve 9, and a connecting housing. The connecting housing is bolted between the permanent magnet motor 1 and the planetary gearbox. The motor shaft of the permanent magnet motor 1 is connected to the outer gear sleeve 8. An inner gear sleeve 9 is fitted outside the outer gear sleeve 8 and is rotatably connected inside the connecting housing. The inner gear sleeve 9 is connected to the sun gear 10 of the planetary gearbox that is closest to the permanent magnet motor 1. Compared with the traditional direct connection between the motor shaft and the planetary gearbox, this utility model provides an outer gear sleeve 8 and an inner gear sleeve 9 between the motor shaft and the planetary gearbox. The wear parts are changed from the motor shaft to the inner gear sleeve 9 and the outer gear sleeve 8, reducing the damage to the motor shaft. A sealing device is provided between the connecting housing and the permanent magnet motor 1 to prevent the lubricating oil in the planetary gearbox from leaking into the permanent magnet motor 1 and causing the permanent magnet motor 1 to malfunction.

[0024] In this embodiment, the motor shaft of the permanent magnet motor 1 is connected to the outer gear sleeve 8 by a double flat key. The two flat keys are arranged 180° apart along the circumference of the motor shaft. The flat keyway is easy to process and has a short processing cycle. The inner gear sleeve 9 is connected to the outer gear sleeve 8 by a spline. The inner gear sleeve 9 is also connected to the sun gear 10 by a spline. When the spline connection wears due to heavy load and frequent forward and reverse operation, the motor shaft in this application is connected to the sun gear 10 through the outer gear sleeve 8 and the inner gear sleeve 9. The wear parts become the outer gear sleeve 8 and the inner gear sleeve 9. At the same time, the outer gear sleeve 8 is made of 18CrNiMo7-6 material and is carburized and quenched. The inner gear sleeve 9 is made of 42CrMo material and is nitrided to improve the surface hardness and wear resistance of the spline.

[0025] In this embodiment, the connecting housing is the input flange 2, which is bolted between the permanent magnet motor 1 and the planetary gearbox. The inner gear sleeve 9 is installed inside the input flange 2 through the inner gear sleeve bearing 15. The sealing device is a double-skeleton oil seal, which is located at the output end of the permanent magnet motor 1 and is sleeved on the outside of the inner gear sleeve 9. The double-skeleton oil seal is fixed to the input flange 2 by bolts. The double-skeleton oil seal provides a reliable seal and is suitable for high dust conditions.

[0026] The double-frame oil seal is located on the side of the input flange 2 near the permanent magnet motor 1. A leak test plug 13 is provided on the input flange 2. The leak test plug 13 is made of transparent material. In this embodiment, the leak test plug 13 is located on the lower side of the input flange 2 near the permanent magnet motor 1. The leak test plug 13 is made of plexiglass. The leak test plug 13 can be used to detect whether the oil seal of the planetary gearbox has failed during operation. When lubricating oil appears in the leak test plug 13, it indicates that the oil seal has failed and maintenance is required.

[0027] In this embodiment, the planetary gearbox is a single-stage planetary gearbox. The planetary gearbox includes a sun gear 10, planet gears 11, an internal gear ring 5, a planet carrier 7, and an output flange 6. The internal gear ring 5 is installed between the intermediate flange 4 and the output flange 6. The intermediate flange 4 is connected to the input flange 2. The planet gears 11 mesh with the internal gear ring 5. The sun gear 10 meshes with the planet gears 11. The planet gears 11 are installed on the planet carrier 7. The planet carrier 7 is installed on the intermediate flange 4 and the output flange 6. An output shaft 14 is integrally provided on the side of the planet carrier 7 away from the permanent magnet motor 1. The motor shaft of the permanent magnet motor 1 transmits power to the sun gear 10 through the outer gear sleeve 8 and the inner gear sleeve 9. The sun gear drives the planet gears 11 to rotate. The planet gears 11 are installed on the planet carrier 7 through the planet gear bearing 12, thereby causing the planet carrier 7 to rotate and then transmit power to the output shaft 14. In this embodiment, the sun gear 10 adopts a floating load-sharing setting. Compared with the load-sharing method where the sun gear 10 is fixed and the planet carrier 7 is floating, the sun gear 10 has a smaller mass and is more sensitive to floating, making it suitable for heavy-load conditions. A double-skeleton oil seal is also provided on the side of the output flange 6 near the output shaft 14.

[0028] like Figure 2As shown, a cooling assembly is installed between the permanent magnet motor 1 and the planetary gearbox. Specifically, the cooling assembly is a water-cooled coil 3. The planetary gearbox is connected to the input flange 2 via an intermediate flange 4. The water-cooled coil 3 is fixedly installed on the side of the intermediate flange 4 near the input flange 2 by several pipe clamps 16. The water-cooled coil 3 is arranged around the inner gear sleeve 9. The inlet 18 and outlet 17 of the water-cooled coil 3 are both located on the intermediate flange 4. The water-cooled coil 3 is connected to the inlet 18 and outlet 17 via compression fittings 19. Cooling water enters from the inlet 18 of the intermediate flange 4, passes through the compression fittings 19 and the water-cooled coil 3, and finally flows out from the outlet 17 of the intermediate flange 4. The special annular spiral winding method of the water-cooled coil 3 significantly increases the heat exchange area of ​​the water-cooled coil 3, and it is easy to install and has a reliable sealing. It can greatly improve the thermal power and operational reliability of the planetary gearbox in a small installation space. The oil chambers on both sides of the intermediate flange 4 are connected through several connecting holes 20 on the intermediate flange 4.

[0029] The permanent magnet motor 1 of this invention has its motor shaft connected to the outer gear sleeve 8 via a double flat key. An inner gear sleeve 9 is fitted outside the outer gear sleeve 8. The inner gear sleeve 9, the outer gear sleeve 8, and the sun gear 10 are all connected via splines. Under heavy load and frequent forward and reverse rotation conditions, when the spline connection wears, the worn parts become the inner gear sleeve 9 and the outer gear sleeve 8, reducing damage to the motor shaft and improving the service life of the permanent magnet motor 1. When replacement is needed, only the inner gear sleeve 9 and the outer gear sleeve 8 need to be replaced, resulting in lower maintenance costs. Furthermore, when the lubricating oil in the planetary gearbox leaks, it leaks into the inner gear sleeve 9 and the outer gear sleeve 8 instead of directly into the permanent magnet motor 1, thus avoiding motor failure.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A semi-direct drive permanent magnet motor, characterized in that: The device includes a permanent magnet motor (1) and a planetary gearbox. The permanent magnet motor (1) and the planetary gearbox are connected by an outer gear sleeve (8), an inner gear sleeve (9) and a connecting housing. The connecting housing is connected between the permanent magnet motor (1) and the planetary gearbox. The motor shaft of the permanent magnet motor (1) is connected to the outer gear sleeve (8). An inner gear sleeve (9) is fitted on the outside of the outer gear sleeve (8). The inner gear sleeve (9) is rotatably connected inside the connecting housing. The inner gear sleeve (9) is connected to the sun gear (10) of the planetary gearbox that is closest to the permanent magnet motor (1). A sealing device is provided between the connecting housing and the permanent magnet motor (1).

2. A semi-direct drive permanent magnet motor according to claim 1, characterized in that: The motor shaft of the permanent magnet motor (1) is connected to the outer gear sleeve (8) by a double flat key, with the two flat keys arranged 180° apart in the circumferential direction.

3. A semi-direct drive permanent magnet motor according to claim 1, characterized in that: The inner gear sleeve (9) and the outer gear sleeve (8) are connected by a spline, and the inner gear sleeve (9) and the sun gear (10) are also connected by a spline.

4. A semi-direct drive permanent magnet motor according to claim 1, characterized in that: A leak test plug (13) is provided on the connecting housing. The leak test plug (13) is made of transparent material.

5. A semi-direct drive permanent magnet motor according to claim 1, characterized in that: A cooling assembly is provided between the permanent magnet motor (1) and the planetary gearbox.

6. A semi-direct drive permanent magnet motor according to claim 5, characterized in that: The cooling component is a water-cooled coil (3). The planetary gearbox is connected to the connecting housing via an intermediate flange (4). The water-cooled coil (3) is fixedly installed on the side of the intermediate flange (4) near the connecting housing. The water-cooled coil (3) is arranged around the inner gear sleeve (9). The water inlet (18) and water outlet (17) of the water-cooled coil (3) are both located on the intermediate flange (4).

7. A semi-direct drive permanent magnet motor according to claim 1, characterized in that: The planetary gearbox is a single-stage planetary gearbox. The planetary gearbox includes a sun gear (10), planet gears (11), an internal gear ring (5), a planet carrier (7), and an output flange (6). The internal gear ring (5) is installed between the intermediate flange (4) and the output flange (6). The intermediate flange (4) is connected to the connecting housing. The planet gears (11) mesh in the internal gear ring (5). The sun gear (10) meshes with the planet gears (11). The planet gears (11) are installed on the planet carrier (7). The planet carrier (7) is installed on the intermediate flange (4) and the output flange (6). An output shaft (14) is integrally provided on the side of the planet carrier (7) away from the permanent magnet motor (1).

8. A semi-direct drive permanent magnet motor according to claim 7, characterized in that: A sealing device is also provided on the side of the output flange (6) near the output shaft (14).

Images