Efficient cooling motor rotor and oil-water composite cooling motor

Abstract

The utility model discloses an efficient cooling motor rotor and an oil-water composite cooling motor, n axial oil ducts and inclined oil ducts corresponding to the axial oil ducts are arranged in the motor rotor, and the n axial oil ducts are parallel to the axis direction of the rotor and are arranged in the rotor by taking the axis of the rotor as a central symmetry line; a central oil duct is arranged at the central position of a rotating shaft of the rotor, and the axial oil duct and the central oil duct are communicated through the inclined oil duct; a rear cover plate of the motor is provided with an oil outlet and an oil inlet, the oil inlet is right opposite to one end of the central oil duct, and the other end of the rotor is provided with an output shaft. According to the utility model, the cooling efficiency of the motor can be greatly improved, and the size and weight of the motor are reduced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a high-efficiency cooled motor rotor and an oil-water composite cooled motor. Background Technology

[0002] Electric motors are widely used in various industrial and everyday equipment. During operation, they generate heat. If this heat is not dissipated in time, it can lead to overheating, affecting the motor's efficiency and lifespan, and even causing malfunctions. The task of motor cooling is to dissipate the heat generated by internal losses, maintaining the temperature rise of various parts of the motor within the standard specified range and striving for uniform internal temperature. Therefore, motor cooling is essential to ensure stable operation and extend its service life.

[0003] Existing motor cooling solutions mainly include two types: air cooling and liquid cooling. Generally, open-type motors use ambient air for cooling, with the cool air carrying away the heat and dissipating it into the surrounding environment. Liquid cooling systems typically involve designing closed water channels inside the motor, using liquid circulation to remove heat. For example, Chinese patent application number 2017711083873.3, entitled "Motor, Powertrain, Power Equipment and Motor Cooling Method," belongs to the traditional liquid cooling method.

[0004] However, for motors with special requirements such as those used in aerial platforms, which need to be compact and lightweight, they generate a lot of heat and cannot be cooled using traditional methods. Utility Model Content

[0005] This invention provides a technical solution for a highly efficient cooled motor rotor and a corresponding motor, which can greatly improve the cooling efficiency of the motor, thereby reducing the size and weight of the motor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-efficiency cooling motor rotor has n axial oil passages and corresponding oblique oil passages inside the rotor. The n axial oil passages are parallel to the rotor axis and are arranged symmetrically inside the rotor with the rotor axis as the center line. A hollow shaft hole is provided at the center of the rotor shaft, and the oblique oil passages connect the axial oil passages and the hollow shaft hole. The rear cover plate of the motor is provided with an oil outlet and an oil inlet. The oil inlet is directly opposite one end of the hollow shaft hole, and an output shaft is provided at the other end of the rotor.

[0008] In the aforementioned high-efficiency cooled motor rotor, the oil inlet port of the inclined oil passage is located at the tail end of the axial oil passage, and the oil outlet port is located at the front end of the rotor hollow shaft hole.

[0009] In the aforementioned high-efficiency cooled motor rotor, an annular groove is provided at the intersection of the oil outlet port of the inclined oil passage and the oil inlet port of the axial oil passage.

[0010] In the aforementioned high-efficiency cooled motor rotor, the rotor unit includes a front rotor shaft, a magnet, and a rear rotor shaft; the magnet is disposed on the outer ring of the front rotor shaft, and the rear rotor shaft is sleeved on the outer ring of the magnet and the front rotor shaft.

[0011] In the aforementioned high-efficiency cooling motor rotor, the annular groove is provided on the end face of the rear half-shaft of the rotor; the axial oil passage and the oblique oil passage are provided inside the front half-shaft of the rotor.

[0012] In the aforementioned highly efficient cooled motor rotor, n=6-12.

[0013] An oil-water hybrid cooling motor includes a housing, a stator unit, and a high-efficiency cooled motor rotor, wherein the stator core of the stator unit is fixed on the inner ring of the housing.

[0014] In the aforementioned oil-water composite cooling motor, the outer ring of the housing is provided with a spiral water groove and a water jacket fitted on the outer ring of the housing. Sealing rings are provided on both sides of the spiral water groove and between the housing, so that a spiral water-cooled sealed cavity is formed between the housing and the water jacket. The water jacket is provided with an inlet and an outlet. Circulating water enters from the inlet of the water jacket, flows out through the spiral water groove and exits from the outlet.

[0015] In the aforementioned oil-water combined cooling motor, a front cover is provided at the front end of the housing. The outer ring of the front cover is sealed to the stator unit by a sealing ring, and a non-contact labyrinth sealing unit is provided between the inner ring of the front cover and the rotor unit.

[0016] In the aforementioned oil-water combined cooling motor, a rear end cover is provided at the rear end of the housing. The outer ring of the rear end cover is sealed with the stator unit by a sealing ring, and a non-contact labyrinth sealing unit is provided between the inner ring of the rear end cover and the rotor unit.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. The rotor of this utility model adopts a "Z"-shaped oil channel cooling structure, including multiple axial oil channels and oblique oil channels inside the rotor, and utilizes a hollow shaft hole as the main oil inlet channel, which reduces the weight of the rotor and makes the heat dissipation of the rotor uniform. In addition, an annular groove is set at the intersection of the axial oil channels and the oblique oil channels. The cooling oil of the oblique oil channel enters the axial oil channel through the annular groove, which reduces the flow resistance at the intersection of the oblique oil channel and the axial oil channel. At the same time, the annular groove structure also facilitates the cooling of the rotor end face, making the entire rotor cool uniformly and improving the cooling efficiency.

[0019] 2. The motor of this utility model adopts a combined water-cooling and oil-cooling method. The stator unit uses a spiral water-cooling structure, where the high specific heat capacity and good thermal conductivity of water evenly dissipate heat from the stator, maximizing the motor's potential efficiency and improving output power per unit weight and volume. The rotor unit uses a "Z"-shaped oil-cooling structure, evenly removing heat generated by the rotor and maintaining the temperature rise of all parts of the motor within standard specifications. This utility model generator has a compact and simple structure, is lightweight, has few parts, is reliable in operation, and is easy to maintain. It not only improves cooling efficiency but also reduces maintenance costs, extends motor life, and meets the special requirements of aerial platforms. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the motor of this utility model;

[0021] Figure 2 This is a schematic diagram of the rotor unit cooling oil supply of the motor of this utility model;

[0022] Figure 3 This is a stator structure diagram of the motor of this utility model;

[0023] Figure 4 This is a schematic diagram of the water flow direction in the spiral channel of the stator unit;

[0024] Figure 5 This is a diagram of the stator unit spiral water channel structure;

[0025] Figure 6 This is a schematic diagram of the inlet and outlet of the stator unit water-cooling structure;

[0026] Figure 7 This is a rotor structure diagram of this utility model;

[0027] Figure 8 This is a schematic diagram showing the flow direction of the cooling oil inside the rotor;

[0028] Figure 9 This is a 3 / 4 sectional view of the rotor's front half shaft;

[0029] Figure 10 This is a structural diagram of the rotor's rear half-shaft;

[0030] The labels in the diagram represent: 2-First retaining ring; 3-Labyrinth seal; 4-Screw; 5-Front pressure plate; 6-Front end cover; 7-Sealing ring; 8-Front bearing; 9-Stator unit; 10-Rotor unit; 11-Rear bearing; 12-Rear end cover; 16-Rear bearing pressure plate; 17-Rear cover plate; 20-Rear sealing seat; 30-Oil outlet; 31-Annular groove; 32-Oil inlet; 33-Angled oil passage; 34-Axial oil passage; 35-Hollow shaft hole; 92-Water jacket; 93-Housing; 94-Stator core; 95-Stator coil; 97-Water inlet; 98-Water outlet; 101-Rotor front half-shaft; 102-Second retaining ring; 103-Magnet; 104-Rotor rear half-shaft; 105-Flat key. Detailed Implementation

[0031] like Figure 1 As shown, the oil-water composite cooling motor of this utility model includes a stator unit 9 and a rotor unit 10, as well as a first retaining ring 2, a labyrinth seal 3, a front pressure plate 5, a front end cover 6, a front bearing 8, a rear bearing 11, a rear end cover 12, a rear pressure plate 16, a rear cover plate 17, a rear sealing seat 20, and several screws 4 and several sealing rings 7.

[0032] A front cover 6 and a rear cover 12 are respectively provided on both sides of the stator unit 9, and the stator unit 9 is fixed to the front cover 6 and the rear cover 12 by screws 4. Sealing rings 7 are respectively provided between the stator unit 9 and the front cover 6 and the rear cover 12 for static sealing. The front cover 6 and the rear cover 12 respectively house the front bearing chamber and the rear bearing chamber. The rotor unit 10 is equipped with the front bearing 8 and the rear bearing 11, which pass through the bearing seats of the front cover 6 and the rear cover 12. When the stator coil 95 is energized with alternating current, the rotor unit 10 rotates under the influence of the magnetic field, and the front bearing 8 and the rear bearing 11 rotate accordingly. Both the front bearing 8 and the rear bearing 11 are lubricated with grease.

[0033] like Figures 2 to 6 As shown, the stator unit 9 includes a sealing ring 7, a water jacket 92, a stator core 94, and a stator coil 95. The stator coil 95 is wound around the stator core 94, and the stator core 94 is fixed on the inner ring of the housing (93). The outer ring of the housing 93 is provided with a spiral water groove, and a sealing ring 7 is provided on each side of the spiral water groove. The water jacket 92 is provided with an inlet 97 and an outlet 98. The water jacket 92 is fitted on the outer ring of the housing 93. The housing 93 and the water jacket 92 are sealed with a sealing ring 7 to form a spiral water-cooled sealed cavity. The circulating water enters from the inlet 97 of the water jacket 92, flows out from the outlet 98 through the spiral water groove, and carries away the heat generated by the heating of the stator coil 95, so that the temperature rise of the stator unit 9 is kept within the standard range.

[0034] like Figure 2 and Figures 7 to 10As shown, the rotor unit 10 consists of a rotor front half-shaft 101, a second retaining ring 102, a magnet 103, and a rotor rear half-shaft 104. The second retaining ring 102 is fitted onto the outer ring of the rotor front half-shaft 101, and the magnet 103 is fixed to the outer ring of the rotor front half-shaft 101 by a label. The rotor rear half-shaft 104 is fitted onto the outer circumference of both the magnet 103 and the rotor front half-shaft 101. The left end of the rotor front half-shaft 101 is divided into a rotating shaft, on which a flat key 105 is mounted.

[0035] The rotor unit 10 has a "Z"-shaped oil passage inside, including n axial oil passages 34 and oblique oil passages 33 corresponding to the axial oil passages 34. The n axial oil passages 34 are parallel to the rotor axis and are arranged symmetrically inside the rotor with the rotor axis as the center. The oblique oil passages 33 connect the axial oil passages 34 and the rotor hollow shaft hole 35. The rear cover plate 17 of the motor has an oil outlet 30 and an oil inlet 32, with the oil inlet 32 ​​facing the rotor hollow shaft hole 35. The axial oil passages 34 and oblique oil passages 33 are located inside the front half shaft 101 of the rotor. The oil inlet port of the oblique oil passage 33 is located at the tail end of the axial oil passage 34, and the oil outlet port is located at the front end of the rotor hollow shaft hole 35. Cooling oil flows in from the inlet 32 ​​through the hollow shaft hole 35 of the rotor unit 10, flows out through n oblique oil channels 33 and axial oil channels 34 to the gap near the front end face of the rotor near the front end cover 6, and then flows out through the outlet 30, repeating the cycle to complete the cooling of the rotor unit 10. This "Z"-shaped oil channel cooling structure utilizes the hollow shaft hole as the main oil inlet channel, which reduces the weight of the rotor while ensuring uniform heat dissipation. Here, n = 6-12, preferably n = 8.

[0036] Furthermore, an annular groove 31 is provided at the intersection of the oil outlet port of the inclined oil passage 33 and the oil inlet port of the axial oil passage 34. The annular groove 31 is located on the end face of the rear half-shaft 104 of the rotor. The function of the annular groove 31 is to allow the cooling oil from the inclined oil passage to pass through the annular groove before entering the axial oil passage, reducing the flow resistance at the intersection of the inclined and axial oil passages. At the same time, the annular groove structure also facilitates the cooling of the rotor end face, resulting in uniform cooling of the entire rotor and improving cooling efficiency.

[0037] Figure 1 and Figure 4 In the process, the sealing of the front bearing 8 is implemented as follows: a sealing groove is provided on the side of the front cover 6 near the bearing, forming a non-contact labyrinth seal with the outer circle of the rotor unit 10; a non-contact labyrinth seal 3 is provided on the other side. The stationary rings of the front bearing 8 and the labyrinth seal 3 are installed in the front bearing seat of the front cover 6 in sequence and are positioned by the front pressure plate 4 and fixed by screws 4; the moving ring of the labyrinth seal 3 is installed on the outer circle of the front half shaft 101 of the rotor unit 10, and the labyrinth seal 3 is positioned by the first retaining ring 2 to limit the axial displacement of the labyrinth seal 3.

[0038] The sealing of the rear bearing 11 is implemented as follows: A sealing groove is provided on the side of the rear end cover 12 near the rotor unit 10, which forms a non-contact labyrinth seal with the rear half-shaft 104 of the rotor unit 10 through a clearance fit; there are two seals on the other end, as follows: A sealing groove is provided in the hole of the rear half-shaft 104 of the rotor unit 10, and the sealing seat 20 is installed on the rear pressure plate 16 and fastened with screws 4. Its outer ring is clearance-fitted with the rear half-shaft 14 of the rotor unit 10 to form the first non-contact labyrinth seal. The rear pressure plate 16 is used for axial positioning of the rear bearing 11 and is fastened with screws 4. A sealing groove is provided on the rear pressure plate 16, which combines with the outer circle of the rear half-shaft 104 of the rotor unit 10 to form the second non-contact labyrinth seal; a rear cover plate 17 is provided at the rear of the rear end cover 12, and the two are connected by screws 4. Sealing rings 7 are respectively provided between the rear cover plate and the rear end cover and the rear sealing seat.

[0039] The motor of this invention adopts a combined water-cooling and oil-cooling cooling method. The stator unit adopts a spiral water channel cooling structure, in which the high specific heat capacity and good thermal conductivity of water dissipate the heat of the motor stator evenly. The rotor unit adopts a "Z"-shaped oil channel cooling structure, which evenly removes the heat generated by the rotor, maximizing the potential efficiency of the motor and improving the output power of the motor per unit weight and volume. This makes the motor structure compact and simple, meeting the special requirements of aerial platforms.

Claims

1. A high efficiency cooled electric machine rotor characterized by: The rotor is internally provided with n axial oil channels (34) and corresponding inclined oil channels (33), the n axial oil channels (34) are parallel to the rotor axis direction and are symmetrically arranged in the rotor with the rotor axis as the center of symmetry; the rotor shaft center position is provided with a hollow shaft hole (35), the inclined oil channels (33) pass through the axial oil channels (34) and the hollow shaft hole (35); the rear cover plate (17) of the motor is provided with an oil outlet (30) and an oil inlet (32), the oil inlet (32) is opposite to one end of the hollow shaft hole (35), and the other end of the rotor is provided with an output shaft.

2. The highly cooled electric machine rotor of claim 1, wherein: The oil inlet port of the inclined oil channel (33) is arranged at the tail end of the axial oil channel (34), and the oil outlet port is arranged at the front end of the rotor hollow shaft hole (35).

3. The highly cooled electric machine rotor of claim 1, wherein: The intersection of the oil outlet port of the inclined oil channel (33) and the oil inlet port of the axial oil channel (34) is provided with an annular groove (31).

4. The highly cooled electric machine rotor of claim 1, wherein: The rotor comprises a rotor front half shaft (101), a magnetic steel (103) and a rotor rear half shaft (104); the magnetic steel (103) is arranged on the outer circle of the rotor front half shaft (101), and the rotor rear half shaft (104) is sleeved on the outer circle of the magnetic steel (103) and the rotor front half shaft (101).

5. The highly cooled electric machine rotor of claim 3, wherein: The annular groove (31) is arranged on the end face of the rotor rear half shaft (104); and the axial oil channel (34) and the inclined oil channel (33) are arranged in the rotor front half shaft (101).

6. The highly cooled electric machine rotor of claim 1, wherein: n=6-12。 7. An oil-water compound cooled electric machine characterized by: The high-efficiency-cooled motor rotor comprises a shell (93), a stator unit (9) and a high-efficiency-cooled motor rotor as claimed in any one of claims 1 to 6, and the stator core (94) of the stator unit (9) is fixed to the inner circle of the shell (93).

8. The oil-water compound cooled electric machine of claim 7, wherein: The outer circle of the shell (93) is provided with a spiral water groove and a water jacket (92) sleeved on the outer circle of the shell (93), the two sides of the spiral water groove and the shell (93) are provided with sealing rings (7), so that a spiral water-cooled closed cavity is formed between the shell (93) and the water jacket (92), the water jacket (92) is provided with a water inlet (97) and a water outlet (98), and circulating water enters the water jacket (92) through the water inlet (97) and flows out through the water outlet (98) through the spiral water groove.

9. The oil-water compound cooled electric machine of claim 8, wherein: The front end of the shell (93) is provided with a front end cover (6), the outer circle of the front end cover (6) is sealed with the stator unit (9) by using a sealing ring (7), and a non-contact labyrinth sealing unit is arranged between the inner circle of the front end cover (6) and the rotor unit (10).

10. The oil-water compound cooled electric machine of claim 8, wherein: The rear end of the shell (93) is provided with a rear end cover (12), the outer circle of the rear end cover (12) is sealed with the stator unit (9) by using a sealing ring (7), and a non-contact labyrinth sealing unit is arranged between the inner circle of the rear end cover (12) and the rotor unit (10).

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