A new double-layer excitation low-temperature motor magnetic pole structure

Abstract

The present invention discloses a novel double-layer excitation low-temperature motor pole structure, which is composed of a U-shaped copper buckle, an arc-shaped copper plate, an outer vacuum cavity, an inner vacuum cavity, an outer side insulation ring, an inner side insulation ring, an outer insulation ring, an inner insulation ring, and a semi-U-shaped cooling channel. The present invention has a compact structure, simple assembly, and convenient later maintenance. It achieves efficient cooling of the excitation winding, effectively reduces the rotor temperature, reduces the required amount of coolant, and reduces costs. The overall structure formed by the U-shaped copper buckle and the arc-shaped copper plate fixes the entire rotating component, and the multi-dimensional cooling circuit formed by the semi-U-shaped cooling channel further improves the cooling effect.

Description

Technical Field

[0001] The present invention relates to the field of generators, and in particular to a novel double-layer excitation low-temperature motor magnetic pole structure. Background Art

[0002] As a device for energy transmission, generators have been widely used. However, with the increasing demand for electricity, the capacity and size of generators are also increasing. This leads to a certain amount of waste in the inner diameter space of the rotor poles. In addition, as the capacity of the generator increases, the loss and heat generation problems of the motor become particularly prominent. If permanent magnets are used in the pole part, not only can the excitation be unable to be adjusted, but once the temperature of the permanent magnet is locally too high, the permanent magnet will demagnetize. Electric excitation can effectively avoid the above shortcomings, and the low resistivity of the motor winding in a low temperature environment can effectively reduce the loss and heat generation. However, the usual low-temperature motor will cool the rotor core and the coil together, which significantly increases the cooling power and makes the price more expensive. Therefore, in order to address the above shortcomings, it is urgent to develop a new double-layer excitation low-temperature motor pole structure. Summary of the Invention

[0003] In view of this, the present invention provides a novel double-layer excitation low-temperature motor magnetic pole structure with the characteristics of simple assembly, low refrigeration power, low cost, and easy on-site installation.

[0004] The technical solution of the present invention is: a double-layer excitation low-temperature motor magnetic pole structure, consisting of a U-shaped copper buckle, an arc-shaped copper plate, an outer vacuum cavity, an inner vacuum cavity, an outer side insulation ring, an inner side insulation ring, an outer insulation ring, an inner insulation ring, and a semi-U-shaped cooling channel;

[0005] The outer vacuum chamber is located above the outer teeth of the rotor in the radial direction and is in close contact with the outer teeth of the rotor;

[0006] The outer heat-insulating ring is sleeved on the outer side of the rotor outer teeth in the circumferential direction;

[0007] The outer excitation winding is sleeved on the outer side of the outer heat insulation ring in the circumferential direction;

[0008] The outer side heat insulation ring is located above the outer excitation winding in the radial direction and is sleeved on the outside of the outer vacuum cavity;

[0009] The inner vacuum chamber is located radially below the inner teeth of the rotor and is in close contact with the inner teeth of the rotor;

[0010] The inner heat-insulating ring is sleeved on the outer side of the inner teeth of the rotor in the circumferential direction;

[0011] The inner excitation winding is sleeved on the outer side of the inner thermal insulation ring in the circumferential direction;

[0012] The inner side heat insulation ring is located below the inner excitation winding in the radial direction and is sleeved on the outer side of the inner vacuum cavity;

[0013] The semi-U-shaped cooling channel is placed on the rotor core groove;

[0014] The U-shaped copper buckle is located above the outer vacuum cavity and the outer side heat insulation ring in the radial direction, and the opening is buckled on the outside of the outer side heat insulation ring toward the axis;

[0015] The arc-shaped copper plate is located radially below the inner vacuum cavity and is in close contact with the inner vacuum cavity;

[0016] One end of the U-shaped copper buckle passes through the first through slot of the rotor core and is welded to the first through slot of the arc-shaped copper plate, and the other end of the U-shaped copper buckle passes through the second through slot of the rotor core and is welded to the second through slot of the arc-shaped copper plate.

[0017] In the above double-layer excitation low-temperature motor pole structure, the rotor core has a first rotor core through slot, a second rotor core through slot and a rotor core groove, and the arc-shaped copper plate has a first arc-shaped copper plate through slot and a second arc-shaped copper plate through slot.

[0018] In the above-mentioned double-layer excitation low-temperature motor pole structure, viewed from the axial direction, the area of ​​the semi-U-shaped cooling channel gradually increases from the end of the rotor outer teeth to the middle of the rotor outer teeth, and the channel area remains unchanged from 120 mm away from the end of the rotor outer teeth and extends 50 mm. Similarly, the semi-U-shaped cooling channel located adjacent to the rotor inner teeth gradually increases from the end of the rotor inner teeth to the middle of the rotor inner teeth, and the channel area remains unchanged from 120 mm away from the end of the rotor inner teeth and extends 50 mm.

[0019] In the above-mentioned double-layer excitation low-temperature motor pole structure, the semi-U-shaped cooling channel is radially placed at one axial end of the rotor pole and circumferentially placed at the other axial end of the rotor pole, and the two contacting semi-U-shaped cooling channels are welded together.

[0020] Technical Effects

[0021] 1. The present invention has a compact structure, simple assembly and convenient later maintenance.

[0022] 2. The present invention achieves efficient cooling of the excitation winding and effectively reduces the rotor temperature.

[0023] 3. The present invention reduces the amount of coolant required and reduces costs.

[0024] 4. The present invention fixes the entire rotating component through the integral structure formed by the U-shaped copper buckle and the arc-shaped copper plate.

[0025] 5. The present invention further improves the cooling effect by forming a multi-dimensional cooling circuit through a semi-U-shaped cooling channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a two-dimensional cross-sectional view of the magnetic pole structure of a new double-layer excitation low-temperature motor.

[0027] Figure 2 This is a partial enlarged view of the C part of the magnetic pole structure of a new double-layer excitation low-temperature motor.

[0028] Figure 3 This is a partial enlarged view of the D part of the magnetic pole structure of a new double-layer excitation low-temperature motor.

[0029] Figure 4 This is the AA cross-sectional view of the magnetic pole structure of a new double-layer excitation low-temperature motor.

[0030] Figure 5 This is a BB cross-sectional view of the magnetic pole structure of a new double-layer excitation low-temperature motor.

[0031] Figure 6 This is the U-shaped copper buckle parts drawing.

[0032] Figure 7 is the rotor pole diagram.

[0033] Figure 8 This is a drawing of an arc-shaped copper plate part.

[0034] Figure 9 This is the parts diagram of the outer insulation ring.

[0035] Figure 10 This is the parts diagram of the outer side insulation ring.

[0036] Figure 11 This is the parts diagram of the inner side insulation ring.

[0037] Figure 12 This is the parts diagram of the inner insulation ring.

[0038] Figure 13 This is a part diagram of a semi-U-shaped cooling channel.

[0039] Figure 14 A partial schematic diagram of a semi-U-shaped cooling channel and the rotor core.

[0040] Figure 15 This is the coolant flow path diagram under the BB cross-section view.

[0041] Explanation of the parts in the figure: 1-rotor pole; 2-outer excitation winding; 3-inner excitation winding; 4-U-shaped copper buckle; 5-arc-shaped copper plate; 6-outer vacuum chamber; 7-inner vacuum chamber; 8-outer side insulation ring; 9-inner side insulation ring; 10-outer insulation ring; 11-inner insulation ring; 12-semi-U-shaped cooling channel; 13-cooler; 14-rotating shaft; 15-tensioning screw; 16-rotor outer teeth; 17-rotor inner teeth; 18-rotor core; 19-rotor core first through slot; 20-rotor core second through slot; 21-rotor core groove; 22-arc-shaped copper plate first through slot; 23-arc-shaped copper plate second through slot. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] like Figures 1 to 5 As shown, a double-layer excitation low-temperature motor magnetic pole structure consists of a U-shaped copper buckle 4, an arc-shaped copper plate 5, an outer vacuum cavity 6, an inner vacuum cavity 7, an outer side insulation ring 8, an inner side insulation ring 9, an outer insulation ring 10, an inner insulation ring 11, and a semi-U-shaped cooling channel 12;

[0044] The outer vacuum chamber 6 is located above the rotor outer teeth 16 in the radial direction and is close to the rotor outer teeth 16;

[0045] The outer heat-insulating ring 10 is sleeved on the outer side of the rotor outer teeth 16 in the circumferential direction;

[0046] The outer excitation winding 2 is sleeved on the outer side of the outer insulation ring 10 in the circumferential direction;

[0047] The outer side heat insulation ring 8 is located above the outer excitation winding 2 in the radial direction and is sleeved on the outer side of the outer vacuum cavity 6;

[0048] The inner vacuum chamber 7 is located radially below the rotor inner teeth 17 and is in close contact with the rotor inner teeth 17;

[0049] The inner heat-insulating ring 11 is sleeved on the outer side of the rotor inner teeth 17 in the circumferential direction;

[0050] The inner excitation winding 3 is sleeved on the outer side of the inner insulation ring 11 in the circumferential direction;

[0051] The inner side heat insulation ring 9 is located below the inner excitation winding 3 in the radial direction and is sleeved on the outer side of the inner vacuum cavity 7;

[0052] The semi-U-shaped cooling channel is placed on the rotor core groove 21;

[0053] The U-shaped copper buckle 4 is located above the outer vacuum cavity 6 and the outer side heat insulation ring 8 in the radial direction, and its opening is buckled toward the axis on the outside of the outer side heat insulation ring 8;

[0054] The arc-shaped copper plate 5 is located radially below the inner vacuum cavity 7 and is in close contact with the inner vacuum cavity 7;

[0055] One end of the U-shaped copper buckle 4 passes through the first through slot 19 of the rotor core and is welded to the first through slot 22 of the arc-shaped copper plate. The other end of the U-shaped copper buckle 4 passes through the second through slot 20 of the rotor core and is welded to the second through slot 23 of the arc-shaped copper plate. The overall structure is compact, easy to assemble, and convenient for later maintenance.

[0056] like Figure 7 As shown, both the rotor outer teeth 16 and the rotor inner teeth 17 are trapezoidal in structure. This eliminates the need for circumferential fixing devices between adjacent inner and outer excitation windings 3 and 2 during rotation.

[0057] like Figures 7-8 As shown, the rotor poles include a rotor core 18, rotor external teeth 16, and rotor internal teeth 17. The rotor core 18 has a first rotor core slot 19, a second rotor core slot 20, and a rotor core groove 21. The arcuate copper plate 5 has a first arcuate copper plate slot 22 and a second arcuate copper plate slot 23. The rotor core groove 21 can cooperate with the fixation of the semi-U-shaped cooling channel 12. The first rotor core slot 19, the second rotor core slot 20, the first arcuate copper plate slot 22, and the second arcuate copper plate slot 23 provide conditions for the installation of the U-shaped copper buckle 4 and the arcuate copper plate 5, facilitating assembly.

[0058] like Figures 2-4 As shown, the outer vacuum chamber 6 and the inner vacuum chamber 7 have the same axial length of 340 mm. The inner vacuum chamber 7 and the outer vacuum chamber 6 effectively isolate heat transfer from the outside to the rotor core 1, which helps reduce the power required for the cooler. Furthermore, they are independent structures with a small size, making them easy to install and maintain.

[0059] like Figures 9-12 As shown, the outer side insulation ring 8, the inner side insulation ring 9, the outer insulation ring 10, and the inner insulation ring 11 are made of non-magnetic insulation materials. The outer insulation ring 10 and the inner insulation ring 11 are provided to effectively hinder the heat transfer from the outer excitation winding 2 and the inner excitation winding 3 to the rotor pole 1, thereby reducing the temperature of the rotor pole 1. At the same time, it is also beneficial to improve the heat exchange capacity between the outer excitation winding 2 and the inner excitation winding 3 and the coolant, reducing the loss of the outer excitation winding 2 and the inner excitation winding 3. The outer side insulation ring 8 and the inner side insulation ring 9 are provided to effectively hinder the heat transfer from the outside to the outer excitation winding 2 and the inner excitation winding 3, thereby reducing the current of the inner excitation winding 3 and the outer excitation winding 2. In addition, the outer side insulation ring 8, the inner side insulation ring 9, the outer insulation ring 10, and the inner insulation ring 11 are all independent structures, which are convenient to install and disassemble.

[0060] like Figure 6 、 Figure 8 As shown, the U-shaped copper buckle 4 and the curved copper plate 5 are made of red copper. The axial length of the U-shaped copper buckle 4 is uniformly 400 mm, and the axial length of the curved copper plate 5 is 460 mm. The structural coordination of the U-shaped copper buckle 4 and the curved copper plate 5 secures the entire rotating component. Furthermore, the magnetic resistance of the U-shaped copper buckle 4 and the curved copper plate 5 effectively reduces eddy current losses in the rotor core 18, the rotor outer teeth 16, and the rotor inner teeth 17, thereby reducing heat generation in the rotor poles 1 and reducing the amount of coolant required, thereby lowering costs.

[0061] like Figure 13 、 Figure 14 As shown, from an axial perspective, the flow area of ​​the semi-U-shaped cooling channel 12 gradually increases from the end of the rotor outer tooth 16 toward the middle of the rotor outer tooth 16. From 120 mm from the end of the rotor outer tooth 16, the flow area remains constant and extends 50 mm. Similarly, the flow area of ​​the semi-U-shaped cooling channel 12 located adjacent to the rotor inner tooth 17 gradually increases from the end of the rotor inner tooth 17 toward the middle of the rotor inner tooth 17. From 120 mm from the end of the rotor inner tooth 17, the flow area remains constant and extends 50 mm. The semi-U-shaped cooling channel 12, which contacts the inner and outer excitation windings 3 and 2, achieves efficient cooling of the outer and inner excitation windings 2 and 3. Furthermore, the structural feature of the semi-U-shaped cooling channel 12 with different flow area at different locations effectively solves the problem of high temperature in the axial middle of the rotor core 18 and uneven temperature distribution in the rotor core when there is no axial ventilation duct.

[0062] like Figure 4 、 Figure 5 As shown, the rotor core 18 is fixed to the rotating shaft 14 by a tightening screw 15, and the cooler 13 is fixed inside the rotating shaft 14. The cooler 13 and the rotating shaft 14 rotate synchronously, solving the problem of dynamic and static sealing between the cooler 13 and the semi-U-shaped cooling channel 12.

[0063] like Figure 4 、 Figure 5 As shown, the semi-U-shaped cooling channel 12 is radially placed at one axial end of the rotor pole 1 and circumferentially placed at the other axial end of the rotor pole 1, and the two contacting semi-U-shaped cooling channels 12 are welded together.

[0064] like Figure 14 、 Figure 15 As shown, the coolant is output from the cooler 13, passes through multiple radially and circumferentially placed semi-U-shaped cooling channels 12 on the rotor core 18, and finally returns to the cooler 13, forming a multi-dimensional cooling circuit, increasing the flow path of the cooling circuit in the entire rotor pole 1, and further improving the cooling effect.

[0065] Finally, the scope of protection of the present invention is not limited to the above-described embodiments. Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the scope and spirit of the present invention. Provided such modifications and variations fall within the scope of the claims and their equivalents, the present invention is intended to encompass such modifications and variations.

Claims

1. A double-layer excitation low-temperature motor magnetic pole structure, characterized by: It consists of a U-shaped copper buckle (4), an arc-shaped copper plate (5), an outer vacuum cavity (6), an inner vacuum cavity (7), an outer side heat insulation ring (8), an inner side heat insulation ring (9), an outer heat insulation ring (10), an inner heat insulation ring (11), and a semi-U-shaped cooling channel (12). The outer vacuum chamber (6) is located above the rotor outer teeth (16) in the radial direction and is in close contact with the rotor outer teeth (16); The outer heat-insulating ring (10) is sleeved on the outer side of the rotor outer teeth (16) in the circumferential direction; The outer excitation winding (2) is sleeved on the outer side of the outer heat insulation ring (10) in the circumferential direction; The outer side heat insulation ring (8) is located above the outer excitation winding (2) in the radial direction and is sleeved on the outside of the outer vacuum cavity (6); The inner vacuum chamber (7) is located radially below the rotor inner teeth (17) and is in close contact with the rotor inner teeth (17); The inner heat-insulating ring (11) is sleeved on the outer side of the rotor inner teeth (17) in the circumferential direction; The inner excitation winding (3) is sleeved on the outer side of the inner heat insulation ring (11) in the circumferential direction; The inner side heat insulation ring (9) is located below the inner excitation winding (3) in the radial direction and is sleeved on the outside of the inner vacuum cavity (7); The semi-U-shaped cooling channel is placed on the rotor core groove (21); The U-shaped copper buckle (4) is located above the outer vacuum cavity (6) and the outer side heat insulation ring (8) in the radial direction, and its opening is buckled on the outside of the outer side heat insulation ring (8) toward the axis; The arc-shaped copper plate (5) is located radially below the inner vacuum cavity (7) and is in close contact with the inner vacuum cavity (7); One end of the U-shaped copper buckle (4) passes through the first through slot (19) of the rotor iron core and is welded to the first through slot (22) of the arc-shaped copper plate, and the other end of the U-shaped copper buckle (4) passes through the second through slot (20) of the rotor iron core and is welded to the second through slot (23) of the arc-shaped copper plate.

2. The double-layer excitation low-temperature motor magnetic pole structure according to claim 1 is characterized by: The rotor core (18) has a first rotor core through slot (19), a second rotor core through slot (20), and a rotor core groove (21); and the arc-shaped copper plate (5) has a first arc-shaped copper plate through slot (22) and a second arc-shaped copper plate through slot (23).

3. The double-layer excitation low-temperature motor magnetic pole structure according to claim 1 is characterized by: Viewed from the axial direction, the flow channel area of ​​the semi-U-shaped cooling channel (12) gradually increases from the end of the rotor outer tooth (16) to the middle of the rotor outer tooth (16), and the flow channel area remains unchanged from 120 mm away from the end of the rotor outer tooth (16) and extends 50 mm. Similarly, the flow channel area of ​​the semi-U-shaped cooling channel (12) located adjacent to the rotor inner tooth (17) gradually increases from the end of the rotor inner tooth (17) to the middle of the rotor inner tooth (17), and the flow channel area remains unchanged from 120 mm away from the end of the rotor inner tooth (17) and extends 50 mm.

4. The double-layer excitation low-temperature motor magnetic pole structure according to claim 1 is characterized by: The semi-U-shaped cooling channel (12) is radially arranged at one axial end of the rotor pole (1) and circumferentially arranged at the other axial end of the rotor pole (1), and the two contacting semi-U-shaped cooling channels (12) are welded together.

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