A high-speed permanent magnet motor and its heat dissipation system

Abstract

The present invention discloses a high-speed permanent magnet motor and its heat dissipation system, comprising: a housing oil sleeve, a motor end cover, a stator and a rotor; a flow channel hole is provided on the housing oil sleeve, a housing flow channel is arranged inside the housing oil sleeve, the flow channel hole is communicated with the housing flow channel, and the housing flow channel is communicated with the stator; the stator and the rotor are connected to the motor end cover, a cooling hole is provided on the motor end cover, the housing flow channel and the stator are both communicated with the cooling hole; the stator is arranged inside the housing oil sleeve, the rotor is hermetically arranged inside the stator, and the rotor is hermetically connected to the motor end cover. This solution realizes the fluid intercommunication with the stator cavity through the structure of the housing oil sleeve, and only one cooling medium is required to dissipate heat from the stator and the armature winding, improving the integration degree of the cooling system and reducing the system complexity. Under different working conditions, it can assist in adjusting the flow rate of the cooling fluid, expanding the heat dissipation capacity of the cooling system. The rotor topology structure of this solution is simple, and through the direct contact between the cooling oil and the rotor core, the efficient cooling of the permanent magnet rotor is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and specifically discloses a high-speed permanent magnet motor and its cooling system. Background Art

[0002] High-speed permanent magnet motors have characteristics such as high efficiency, high power density, and high-speed direct drive, and have received extensive attention in fields such as aerospace, electric vehicles, and in-vehicle power generation sources.

[0003] Under the condition of the same power rating, high-speed permanent magnet motors have the advantages of small volume and light weight compared with conventional-speed permanent magnet motors. However, the high-frequency magnetic field caused by high speed leads to an increase in stator core loss, rotor eddy current loss, and armature winding copper loss, increasing the total heat generation of the system, promoting a further increase in the motor temperature rise, and being unfavorable for the safe operation of the permanent magnet motor at high speed. In order to reduce the temperature rise on the stator side of the motor, an additional machine shell water jacket is usually used to cool the stator, and the armature winding is cooled by an oil immersion strategy.

[0004] Traditional cooling topologies usually use two cooling media to dissipate heat from the stator and the armature, resulting in a complex cooling system and being unfavorable for the integration of the motor system. In order to reduce the temperature rise on the rotor side, the existing methods are mainly forced air cooling. However, when cooling the rotor by forced air cooling, the wind abrasion on the surface of the high-speed rotor is relatively large, resulting in an increase in the temperature rise of the fluid in the air gap, additionally increasing the fluid viscosity, and causing a further increase in the surface friction loss of the rotor, making it difficult to meet the rotor cooling requirements of high-speed permanent magnet motors. In addition, the small radial air gap length leads to a large air gap flow resistance. To achieve rotor cooling, it is necessary to additionally increase the external cooling fluid pressure, increasing the cooling cost, reducing the heat dissipation efficiency of the motor system, and the cooling system is complex.

[0005] Therefore, in view of this, the inventor provides a high-speed permanent magnet motor and its cooling system to solve the above problems. Summary of the Invention

[0006] (1) Technical Problems to be Solved

[0007] Based on this, the present invention provides a high-speed permanent magnet motor and its cooling system to solve the technical problems of complex cooling systems, diverse cooling media, and poor cooling effects in the prior art.

[0008] (2) Technical Solutions

[0009] To solve the above technical problems, the present invention proposes a high-speed permanent magnet motor and its cooling system, including: a machine shell oil jacket, a motor end cover, a stator, and a rotor;

[0010] A flow channel hole is provided on the casing oil sleeve, a casing flow channel is provided inside the casing oil sleeve, the flow channel hole is communicated with the casing flow channel, and the casing oil sleeve can seal the permanent magnet motor;

[0011] Both the stator and the rotor are arranged between the motor end covers, and the stator is connected to one side of the motor end cover. The motor end cover is connected to the inner surface of the casing oil sleeve. A cooling hole is provided on the motor end cover, and the casing flow channel and the stator are both communicated with the cooling hole;

[0012] The stator is arranged inside the casing oil sleeve, the rotor is hermetically arranged inside the stator, and the rotor passes through the motor end cover and is hermetically connected to the motor end cover.

[0013] Preferably, the casing oil sleeve includes a casing end cover and a housing;

[0014] The casing flow channel is arranged between the casing end cover and the housing. A radial through hole communicated with the stator is opened on the housing, and the cooling hole is communicated with the casing flow channel through the radial through hole.

[0015] Preferably, the radial through hole includes a first radial through hole and a second radial through hole. The first radial through hole and the second radial through hole are respectively arranged at both ends of the casing flow channel, and a guide strip is arranged between the first radial through hole and the second radial through hole on the casing flow channel.

[0016] Preferably, the flow channel hole includes a liquid inlet hole and a liquid outlet hole. The liquid inlet hole and the liquid outlet hole are respectively arranged at both ends of the casing flow channel, communicated with the casing flow channel, and both the liquid inlet hole and the liquid outlet hole can be sealed.

[0017] Preferably, the motor end cover includes a left end cover and a right end cover;

[0018] The left end cover and the right end cover are respectively arranged on both sides of the casing oil sleeve. The left end cover and the right end cover are both connected to the stator, and the left end cover and the right end cover are both hermetically connected to the rotor.

[0019] Preferably, the cooling hole includes a cooling inlet hole and a cooling outlet hole;

[0020] The cooling inlet hole is arranged on the left end cover, the cooling outlet hole is arranged on the right end cover, and the cooling inlet hole and the cooling outlet hole are both communicated with the stator and the casing flow channel.

[0021] Preferably, the stator includes a stator core, an AC winding, and a stator oil separation sleeve;

[0022] The stator core is arranged inside the oil jacket of the housing. The AC winding is clamped on the stator core. The stator oil separation sleeve is abutted against the inner surface of the stator core. Both ends of the stator oil separation sleeve are hermetically connected to the motor end cover. The rotor is arranged inside the stator oil separation sleeve;

[0023] A stator flow path is formed between the stator oil separation sleeve and the oil jacket of the housing, and the stator flow path is communicated with the housing flow path.

[0024] Preferably, the rotor includes a flow channel frame, a rotor core, a diversion plate, a permanent magnet, and a rotor sheath;

[0025] The flow channel frame passes through the motor end cover on one side and is hermetically connected to the motor end cover. The rotor core passes through the motor end cover on the other side and is hermetically connected to the motor;

[0026] The flow channel frame, the rotor core, the diversion plate, the permanent magnet, and the sheath are coaxially arranged. The flow channel frame is arranged inside the rotor core and is connected to the rotor core. The diversion plate is hermetically arranged on the flow channel frame. The permanent magnet is arranged outside the rotor core. The sheath is arranged outside the permanent magnet.

[0027] Preferably, the flow channel frame includes a flow channel frame connecting shaft, a flow channel frame cooling part, an oil inlet, a radial flow channel of the flow channel frame, and an axial flow channel of the flow channel frame;

[0028] The flow channel frame connecting shaft passes through the motor end cover and is hermetically connected to the motor end cover. An oil inlet is formed at one end of the flow channel frame connecting shaft to introduce a cooling fluid. A radial flow channel of the flow channel frame is arranged at the other end of the flow channel frame connecting shaft. One end of the radial flow channel of the flow channel frame is communicated with the oil inlet. An axial flow channel of the flow channel frame is arranged on the flow channel frame cooling part. The other end of the radial flow channel of the flow channel frame is communicated with the axial flow channel of the flow channel frame. The diversion plate is hermetically arranged at the end of the flow channel frame cooling part. The flow channel frame connecting shaft and the flow channel frame cooling part are integrally formed.

[0029] Preferably, the diversion plate includes a radial flow channel of the diversion plate, a radial guide strip of the diversion plate, and a positioning hole for bolt connection of the diversion plate;

[0030] The positioning hole for bolt connection of the diversion plate is hermetically connected to the flow channel frame. The radial flow channel of the diversion plate is formed between adjacent radial guide strips of the diversion plate to guide the cooling fluid to flow into the axial cavity of the rotor core.

[0031] (III) Beneficial effects

[0032] Compared with the prior art, the high-speed permanent magnet motor and its heat dissipation system of the present invention have the following advantages:

[0033] The high-speed permanent magnet motor and its heat dissipation system of the present invention are provided with a cooling fluid inlet and a cooling fluid outlet on the casing oil jacket. When the motor is operating normally under rated conditions, the cooling fluid inlet and the cooling fluid outlet are closed, and the external cooling fluid enters the stator cavity through a plurality of cooling inlets provided on the end cover. The cooling fluid entering the stator cavity forms two cooling flow paths in the motor through the radial through holes opened on the casing flow path, that is, one flows axially through the stator slot opening to cool the segmented stator and the armature winding; the other flows into the casing flow path through the first radial through hole connecting the casing flow path to further dissipate heat from the stator, and after cooling, it converges on the right side of the stator through the second radial through hole and flows out of the stator cavity through the cooling outlet hole. When the motor is in an overload condition, the cooling fluid inlet and the cooling fluid outlet are opened. At this time, the external cooling fluid can also enter the motor through the cooling fluid inlet to increase the heat dissipation efficiency of the heat dissipation system. In order to reduce the fluid pressure of the cooling outlet hole on the motor end cover, the liquid outlet hole on the casing flow path can be opened to allow part of the cooling fluid to flow out of the casing flow path. The liquid inlet hole and the liquid outlet hole on the casing flow path serve as the inlet and outlet of the standby cooling fluid, and when the heat dissipation efficiency of the motor cannot meet the requirements, they are used as auxiliary cooling channels to cool the motor.

[0034] Compared with the traditional high-speed permanent magnet motor that uses an external casing water jacket and oil immersion method to cool the stator and the armature, this solution uses a kind of cooling fluid to dissipate heat from the stator and the armature winding, reducing the complexity of the motor cooling system and the economic cost of the cooling system. On the other hand, when the high-speed permanent magnet motor is in an overload condition, the liquid inlet hole and the liquid outlet hole of the casing oil jacket are opened, and cooling fluid is introduced into the casing liquid inlet hole on the premise of keeping the flow rate of the cooling inlet hole on the end cover unchanged. The combination of the casing liquid inlet hole and the end cover cooling inlet hole realizes the flexible adjustment of the cooling capacity of the motor heat dissipation system under different working conditions, further expands the heat dissipation capacity of the cooling system, and reduces the risk of the motor malfunctioning caused by the temperature rise of the motor winding under harsh working conditions.

[0035] Moreover, the rotor topology structure in this high-speed permanent magnet motor is simple. Through the direct contact between the cooling oil and the rotor core, the direct cooling of the permanent magnet rotor is realized, reducing the temperature rise of the high-speed permanent magnet rotor under rated conditions and overload conditions, reducing the temperature rise caused by rotor eddy current loss and rotor surface wind friction loss, reducing the risk of irreversible demagnetization of rare earth permanent magnets affected by high temperature, and improving the reliability of the motor system. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0037] Figure 1 Schematic diagram of the overall structure of the high-speed permanent magnet motor and its heat dissipation system of the present invention;

[0038] Figure 2 Schematic diagram of the structure of the housing oil jacket of the high-speed permanent magnet motor and its heat dissipation system of the present invention;

[0039] Figure 3 Schematic diagram of the cooling medium flow path on the stator side when the high-speed permanent magnet motor and its heat dissipation system of the present invention are in the normal working state;

[0040] Figure 4 Schematic diagram of the cooling medium flow path on the stator side when the high-speed permanent magnet motor and its heat dissipation system of the present invention are in the overload working state;

[0041] Figure 5 Schematic diagram of the overall structure of the rotor in the high-speed permanent magnet motor and its heat dissipation system of the present invention;

[0042] Figure 6 Schematic diagram of the structure of the flow channel frame in the high-speed permanent magnet motor and its heat dissipation system of the present invention;

[0043] Figure 7 Schematic diagram of the structure of the rotor core in the high-speed permanent magnet motor and its heat dissipation system of the present invention;

[0044] Figure 8 Schematic diagram of the structure of the diversion plate in the high-speed permanent magnet motor and its heat dissipation system of the present invention;

[0045] Figure 9 Schematic diagram of the structure of the assembly of the diversion plate and the flow channel frame in the high-speed permanent magnet motor and its heat dissipation system of the present invention;

[0046] Figure 10 Schematic diagram of the cooling medium flow path of the rotor assembly in the high-speed permanent magnet motor and its heat dissipation system of the present invention.

[0047] Description of reference numerals:

[0048] 1-1, housing oil jacket; 1-2, housing flow channel; 1-2-1, guide strip; 1-2-2, first radial through hole; 1-2-3, second radial through hole; 1-2-4, liquid inlet hole; 1-2-5, liquid outlet hole; 1-3-1, liquid inlet hole sealing bolt; 1-3-2, liquid outlet hole sealing bolt;

[0049] 2-1, stator core; 2-2, AC winding; 2-3, stator oil separation sleeve;

[0050] 3-1, left end cover; 3-1-1, cooling inlet hole; 3-2, right end cover; 3-2-1, cooling outlet hole; 3-3, left bearing; 3-4, right bearing;

[0051] 4-1, Runner support; 4-1-1, Oil inlet; 4-1-2, Radial runner of the runner support; 4-1-3, Axial runner of the runner support; 4-1-4, Stud connection positioning hole of the runner support; 4-1-5, Axial connection bolt hole of the runner support;

[0052] 4-2, Rotor core; 4-2-1, Radial oil outlet hole of the rotor core; 4-2-2, Axial connection bolt hole of the rotor core; 4-3, Drainage plate; 4-3-1, Radial runner of the drainage plate; 4-3-2, Radial guiding strip of the drainage plate; 4-3-3, Stud connection positioning hole of the drainage plate; 4-4, Permanent magnet; 4-5, Sheath;

[0053] 5, Axial flow path of the housing runner; 6, Stator flow path; 7, Internal flow path of the rotor. Detailed implementation manner

[0054] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manner of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0055] The following will further explain the high-speed permanent magnet motor and its heat dissipation system of the present invention with reference to the attached Figures 1-10 drawings.

[0056] Please refer specifically to Figures 1-2 , the present invention discloses a high-speed permanent magnet motor and its heat dissipation system, which includes: a housing oil sleeve 1-1, a motor end cover, a stator, and a rotor; a flow path hole is provided on the housing oil sleeve 1-1, a housing flow path 1-2 is provided inside the housing oil sleeve 1-1, the flow path hole is communicated with the housing flow path 1-2, the housing flow path 1-2 is communicated with the stator, and the housing oil sleeve 1-1 can seal the permanent magnet motor; the stator and the rotor are both arranged between the motor end covers and the stator is connected to one side of the motor end cover, the motor end cover is connected to the inner surface of the housing oil sleeve 1-1, a cooling hole is provided on the motor end cover, and the housing flow path 1-2 and the stator are both communicated with the cooling hole; the stator is arranged inside the housing oil sleeve 1-1, the rotor is hermetically arranged inside the stator, the rotor passes through the motor end cover and is hermetically connected to the motor end cover.

[0057] In this embodiment, the high-speed permanent magnet motor realizes fluid intercommunication between the housing oil jacket 1-1 and the stator oil cavity, achieving the purpose of efficiently dissipating heat from the stator and armature windings with only one cooling medium, simplifying the complexity of external cooling auxiliary facilities, improving the integration of the stator cooling system, and reducing the complexity of the stator and armature winding cooling systems. Under different working conditions, the flow channel holes can assist in adjusting the cooling fluid flow rate of the cooling system, expanding the heat dissipation capacity of the cooling system. Moreover, through the setting of the housing flow channel 1-2, the high-speed permanent magnet motor forms two cooling flow paths. One is a path that flows in from the cooling hole, passes axially through the stator slot opening to cool the segmented stator and armature windings; the other is a path that flows in from the cooling hole, flows into the housing flow channel 1-2 through the first radial through hole 1-2-2 connecting the housing flow channel 1-2, further realizing heat dissipation of the stator, and after cooling, converges on the right side of the stator through the second radial through hole 1-2-3 and flows out of the stator cavity through the cooling outlet hole 3-2-1. The motor end cover is jointly composed of the left end cover 3-1, the right end cover 3-2, the left bearing 3-3, and the right bearing 3-4. The left bearing 3-3 is arranged on the central axis of the left end cover 3-1 and is connected to the left end cover 3-1. The right bearing 3-4 is arranged on the central axis of the right end cover 3-2 and is connected to the right end cover 3-2. The left end cover 3-1 is closely attached to both end faces of the right end cover 3-2 and the stator oil separation sleeve 2-3. The rotor 4 is located in the middle of the left end cover 3-1 and the right end cover 3-2 and is located inside the stator oil separation sleeve 2-3.

[0058] When the motor is in normal working conditions, the flow channel holes are closed. When the high-speed permanent magnet motor is cooled, it only flows into the motor from the cooling holes opened on the motor end cover, and the stator and armature windings of the motor are efficiently cooled through the above two cooling flow paths. The superimposed cooling flow paths further improve the integration of the stator cooling system and the cooling and heat dissipation effect of the high-speed permanent magnet motor. When the motor is in overload working conditions, the flow channel holes are opened. When the high-speed permanent magnet motor is cooled, it not only flows into the motor from the cooling holes opened on the motor end cover, but also can flow into the motor through the flow channel holes opened on the housing flow channel 1-2. The setting of the flow channel holes can not only assist in adjusting the cooling fluid flow rate of the cooling system, expand the heat dissipation capacity of the cooling system, reduce the risk of the motor malfunctioning caused by the temperature rise of the motor windings under harsh working conditions, but also reduce the fluid pressure of the cooling outlet hole 3-2-1 on the motor end cover, further ensuring the stability of the electrode.

[0059] Such as Figures 1-4As shown, the housing oil sleeve 1-1 includes a housing end cover and a housing; a housing flow channel 1-2 is provided between the housing end cover and the housing. A radial through hole communicating with the stator is formed on the housing. The cooling hole communicates with the housing flow channel 1-2 through the radial through hole. The radial through hole includes a first radial through hole 1-2-2 and a second radial through hole 1-2-3. The first radial through hole 1-2-2 and the second radial through hole 1-2-3 are respectively arranged at both ends of the housing flow channel 1-2 and both communicate with the stator. A guiding strip 1-2-1 is arranged between the first radial through hole 1-2-2 and the second radial through hole 1-2-3 on the housing flow channel 1-2.

[0060] In this embodiment, the housing oil sleeve 1-1 is preferably made of a high-strength lightweight non-magnetic metal material. The housing flow channel 1-2 is an integrated structure. The housing flow channel 1-2 is in an axial form and multiple ones are evenly distributed along the circumferential direction. The housing flow channel 1-2 has multiple radially symmetrically distributed radial through holes, and these radial through holes are evenly distributed along the circumferential direction. Through the arrangement of the radial through holes, the integration degree of the heat dissipation system of this high-speed permanent magnet motor is improved, so that the cooling fluid flowing in from the cooling inlet hole 3-1-1 can respectively form two cooling flow paths through the first radial through hole 1-2-2, realizing the composite cooling and temperature reduction of the stator and the armature winding.

[0061] As Figures 2-4 shown, the flow channel holes include a liquid inlet hole 1-2-4 and a liquid outlet hole 1-2-5. The liquid inlet hole 1-2-4 and the liquid outlet hole 1-2-5 are respectively arranged at both ends of the housing flow channel 1-2 and communicate with the housing flow channel 1-2, and both the liquid inlet hole 1-2-4 and the liquid outlet hole 1-2-5 can be sealed. The motor end cover includes a left end cover 3-1 and a right end cover 3-2; the left end cover 3-1 and the right end cover 3-2 are respectively arranged on both sides of the housing oil sleeve 1-1. The left end cover 3-1 and the right end cover 3-2 are both connected to the stator, and the left end cover 3-1 and the right end cover 3-2 are both hermetically connected to the rotor. The cooling holes include a cooling inlet hole 3-1-1 and a cooling outlet hole 3-2-1; the cooling inlet hole 3-1-1 is arranged on the left end cover 3-1, the cooling outlet hole 3-2-1 is arranged on the right end cover 3-2, and both the cooling inlet hole 3-1-1 and the cooling outlet hole 3-2-1 communicate with the stator and the housing flow channel 1-2.

[0062] In this embodiment, a plurality of cooling inlet holes 3-1-1 are formed in the left end cover 3-1, and a plurality of cooling outlet holes 3-2-1 are formed in the right end cover 3-2. When the motor is running normally, the external cooling fluid flows in through the cooling inlet holes 3-1-1 in the left end cover 3-1, and after passing through two cooling flow paths in the motor, it flows out through the cooling outlet holes 3-2-1 in the right end cover 3-2. At this time, the liquid inlet hole 1-2-4 and the liquid outlet hole 1-2-5 at both ends of the housing flow path 1-2 are sealed by the liquid inlet hole sealing bolt 1-3-1 and the liquid outlet hole sealing bolt 1-3-2 respectively. When the motor is in an overload condition and it is difficult to meet the temperature rise limit of the motor only through the cooling holes on the motor end cover, the liquid inlet hole sealing bolt 1-3-1 and the liquid outlet hole sealing bolt 1-3-2 are opened to expand the heat dissipation capacity of the cooling system and reduce the risk of the motor malfunctioning caused by the temperature rise of the motor winding under harsh conditions.

[0063] The stator includes a stator core 2-1, an AC winding 2-2, and a stator oil separation sleeve 2-3; the stator core 2-1 is arranged in the housing oil sleeve 1-1, the AC winding 2-2 is clamped on the stator core 2-1, the stator oil separation sleeve 2-3 abuts against the inner surface of the stator core 2-1, and both ends of the stator oil separation sleeve 2-3 are hermetically connected to the motor end cover. The rotor is arranged in the stator oil separation sleeve 2-3; a stator flow path 6 is formed between the stator oil separation sleeve 2-3 and the housing oil sleeve 1-1, and the stator flow path 6 is communicated with the housing flow path.

[0064] Specifically, the stator core 2-1 is a multi-segment stator core 2-1 arranged symmetrically. The segmented stator core 2-1 has a toothed groove structure and is axially laminated from a material with high magnetic saturation performance, and each segment of the stator core 2-1 is arranged at equal intervals axially. The armature winding is a combination of one set or multiple sets of symmetric three-phase AC windings 2-2, and the armature winding adopts a Y-type, delta-type or a hybrid connection method of both. The AC winding 2-2 is embedded inside the toothed grooves of the segmented stator core 2-1, and the stator oil separation sleeve 2-3 is installed closely against the inner surface of the stator core 2-1. The stator oil separation sleeve 2-3 has a static sealing function, and the setting of the stator oil separation sleeve 2-3 can effectively prevent the cooling fluid in the stator cavity from flowing into the rotor cavity.

[0065] The following specifically describes the specific cooling processes of the motor in this solution under two different working conditions:

[0066] During the cooling process under normal conditions, the internal flow path of the motor is as Figure 3As shown, the external cooling fluid enters the stator cavity from the cooling inlet hole 3-1-1 of the left end cover 3-1. At this time, the stator oil separation sleeve 2-3 plays a role of static seal to ensure that the cooling fluid in the stator cavity will not leak into the rotor cavity. There are axial guide bars 1-2-1, first radial through holes 1-2-2 and second radial through holes 1-2-3 on the housing flow channel 1-2. On the one hand, the cooling fluid entering the stator cavity flows through the slot gaps of the segmented stator core 2-1 to form the stator flow path 6; on the other hand, the cooling fluid flows out of the stator cavity through the first radial through hole 1-2-2 on the housing flow channel 1-2, flows along the guide bar 1-2-1 to the second radial through hole 1-2-3 and then flows into the stator cavity to form the axial flow path 5 of the housing flow channel; finally, the axial flow path 5 of the housing flow channel and the stator flow path 6 converge in the right stator cavity and flow out of the stator cavity through the cooling outlet hole 3-2-1 of the right end cover 3-2.

[0067] During the cooling process under the overload condition, the internal flow path of the motor is as Figure 4 shown. Due to the short-term increase in the electrical load of the armature winding, the cooling and heat dissipation conditions under the rated condition are difficult to meet the temperature rise limit of the motor. For this working condition, the inlet hole sealing bolt 1-3-1 at the housing inlet hole 1-2-4 is removed. At this time, the external fluid enters the inside of the housing flow channel 1-2 through the housing inlet hole 1-2-4 and flows along the axial guide bar 1-2-1 to further dissipate heat from the segmented stator. In order to reduce the fluid pressure at the stator cooling outlet hole 3-2-1, the outlet hole sealing bolt 1-3-2 at the housing outlet hole 1-2-5 is removed. At this time, part of the cooling fluid inside the housing flow channel 1-2 will flow out of the housing flow channel 1-2 through the housing outlet hole 1-2-5.

[0068] As Figures 5-10 shown, the rotor includes a flow channel frame 4-1, a rotor core 4-2, a diversion plate 4-3, a permanent magnet 4-4 and a rotor sheath 4-5; the flow channel frame 4-1 passes through one side of the motor end cover and is hermetically connected to the motor end cover, and the rotor core 4-2 passes through the other side of the motor end cover and is hermetically connected to the motor; the flow channel frame 4-1, the rotor core 4-2, the diversion plate 4-3, the permanent magnet 4-4 and the sheath 4-5 are coaxially arranged. The flow channel frame 4-1 is arranged inside the rotor core 4-2 and the flow channel frame 4-1 is connected to the rotor core 4-2. The diversion plate 4-3 is hermetically arranged on the flow channel frame 4-1. The permanent magnet is arranged outside the rotor core 4-2, and the sheath 4-5 is arranged outside the permanent magnet 4-4.

[0069] The runner frame 4-1 includes a runner frame 4-1 connecting shaft, a runner frame 4-1 cooling part, an oil inlet 4-1-1, a runner frame radial runner 4-1-2, and a runner frame axial runner 4-1-3; the runner frame 4-1 connecting shaft passes through the motor end cover and is hermetically connected to the motor end cover. An oil inlet 4-1-1 is provided at one end of the runner frame 4-1 connecting shaft to introduce cooling fluid. A runner frame radial runner 4-1-2 is provided at the other end of the runner frame 4-1 connecting shaft. One end of the runner frame radial runner 4-1-2 is communicated with the oil inlet 4-1-1. A runner frame axial runner 4-1-3 is provided on the runner frame 4-1 cooling part. The other end of the runner frame radial runner 4-1-2 is communicated with the runner frame axial runner 4-1-3. A diversion plate 4-3 is hermetically provided at the end of the runner frame 4-1 cooling part. The runner frame 4-1 connecting shaft and the runner frame 4-1 cooling part are integrally formed.

[0070] In this embodiment, a cup-shaped connecting platform extends radially near the runner frame 4-1 radial channel on the runner frame 4-1 connecting shaft. A plurality of runner frame axial connecting bolt holes 4-1-5 are provided on the cup-shaped connecting platform. Corresponding rotor core axial connecting bolt holes 4-2-2 are provided at the end of the rotor core 4-2. The runner frame 4-1 and the rotor core 4-2 are connected through the runner frame axial connecting bolt holes 4-1-5 and the rotor core axial connecting bolt holes 4-2-2. A plurality of radial through holes are provided on the shaft connecting side of the rotor core 4-2 to discharge the cooling fluid. When cooling the rotor, the cooling fluid flows into the runner frame 4-1 connecting shaft through the oil inlet 4-1-1 of the runner frame 4-1, reaches the inner surface of the rotor core 4-2 along the runner frame radial runner 4-1-2 in the runner frame 4-1 connecting shaft, cools the rotor core 4-2 along the runner frame axial runner 4-1-3, and finally flows into the shaft cavity of the rotor core 4-2 along the diversion plate 4-3 integrally formed with the runner frame 4-1, and is sprayed to the outside of the rotor through the rotor core radial oil outlet hole 4-2-1, finally forming an internal cooling flow path of the rotor.

[0071] The above rotor topology is simple, and through the direct contact between the cooling oil and the rotor core 4-2, the direct cooling of the permanent magnet rotor is realized, the temperature rise of the high-speed permanent magnet rotor under rated conditions and overload conditions is reduced, the risk of irreversible demagnetization of the rare earth permanent magnet 4-4 caused by high temperature is reduced, and the reliability of the motor system is improved. The inner side of the rotor core 4-2 is in direct contact with the cooling oil channel, realizing the efficient cooling of the rotor, reducing the temperature rise caused by rotor eddy current loss and rotor surface windage loss, reducing the risk of irreversible demagnetization of the permanent magnet 4-4 affected by temperature, and increasing the reliability of the motor system. Axially, the contact surface between the runner frame 4-1 and the rotor core 4-2 is an interference fit.

[0072] Furthermore, in the above embodiment, the rotor permanent magnet 4-4 is divided into multiple pieces along the axial direction and the circumferential direction, the axial length of the rotor sheath 4-5 is consistent with the axial length of the permanent magnet 4-4, the axial length of the rotor core 4-2 is consistent with the axial length of the runner frame 4-1, the runner frame 4-1, the guide plate 4-3 and the rotor core 4-2 are respectively an integrated structure, and are made of high-strength steel by forging. The sheath 4-5 is made of carbon fiber wound with high tension and is located at the radial outermost side of the rotor, the permanent magnet 4-4 is a rare earth permanent magnet 4-4, located inside the carbon fiber sheath 4-5, the magnetization form is a Halbach array, and is divided into multiple pieces along the axial direction to achieve the purpose of suppressing the rotor eddy current loss.

[0073] See also Figures 8-10 The guide plate 4-3 includes a guide plate radial flow channel 4-3-1, a guide plate radial guide strip 4-3-2 and a guide plate stud connection positioning hole 4-3-3; the guide plate stud connection positioning hole 4-3-3 is sealed and connected to the flow channel frame 4-1, and a guide plate radial flow channel 4-3-1 is formed between adjacent guide plate radial guide strips 4-3-2 to guide the cooling fluid to flow to the axial cavity of the rotor core 4-2.

[0074] In this embodiment, the guide plate 4-3 is axially located in the middle of the runner frame 4-1 and the rotor core 4-2. When the permanent magnet rotor is assembled, the guide plate stud connection positioning hole 4-3-3 of the guide plate 4-3 is coaxially aligned with the runner frame stud connection positioning hole 4-1-4 of the runner frame 4-1, and assembled through the studs; the radial contact surface of the guide plate 4-3 and the runner frame 4-1 is a transition fit, and is coated with high-temperature grease to form a seal during assembly to prevent the rotor cooling fluid from leaking into the rotor cavity. The setting of the guide plate 4-3 further allows the cooling fluid to be diverted through the runner frame 4-1 to dissipate heat to the inner wall of the rotor core 4-2, and then converge through the guide plate 4-3, and then the cooling fluid is discharged through the rotor core radial oil outlet hole 4-2-1 on the shaft side of the rotor core 4-2.

[0075] The specific process of cooling the rotor in this solution is described in detail below. During the cooling process, the flow path 7 inside the rotor is as follows: Figure 10 As shown:

[0076] The external cooling fluid flows into the connecting shaft of the flow channel frame 4-1 from the oil inlet 4-1-1 of the flow channel frame 4-1, passes through the connecting shaft to the end of the flow channel frame 4-1, and flows out along the radial flow channel 4-1-2 of the flow channel frame opened at the end of the flow channel frame 4-1. The outflowing cooling fluid reaches the inner surface of the rotor core 4-2 and cools the inner wall of the rotor core 4-2 along the axial flow channel 4-1-3 of the flow channel frame. After the cooled cooling fluid flows to the other end of the flow channel frame 4-1, it flows into the shaft cavity of the rotor core 4-2 along the diversion plate 4-3, and is sprayed to the outside of the rotor along the radial oil outlet hole 4-2-1 of the rotor core opened on the coaxial side of the rotor core 4-2, finally forming the internal flow path 7 of the permanent magnet rotor.

[0077] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two components, or a "transmission connection", that is, power connection is carried out through various suitable methods such as belt drive, gear drive or sprocket drive. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Claims

1. A high-speed permanent magnet motor, characterized in that, Comprising: A casing oil sleeve, a motor end cover, a stator and a rotor; A flow channel hole is provided on the casing oil sleeve, a casing flow channel is provided inside the casing oil sleeve, the flow channel hole is communicated with the casing flow channel, the casing flow channel is communicated with the stator, and the casing oil sleeve can seal the permanent magnet motor; Both the stator and the rotor are arranged between the motor end covers and the stator is connected to one side of the motor end cover, the motor end cover is connected to the inner surface of the casing oil sleeve, and a cooling hole is provided on the motor end cover, and the casing flow channel and the stator are both communicated with the cooling hole; The stator is arranged inside the casing oil sleeve, the rotor is hermetically arranged inside the stator, the rotor passes through the motor end cover and is hermetically connected to the motor end cover, and a stator flow path is formed between the stator and the casing oil sleeve, and the stator flow path is communicated with the casing flow channel; The rotor includes a flow channel frame, a rotor iron core, a diversion plate, a permanent magnet and a rotor sheath; the flow channel frame passes through the motor end cover on one side and is hermetically connected to the motor end cover, and the rotor iron core passes through the motor end cover on the other side and is hermetically connected to the motor end cover; the flow channel frame, the rotor iron core, the diversion plate, the permanent magnet and the sheath are coaxially arranged, the flow channel frame is arranged inside the rotor iron core and the flow channel frame is connected to the rotor iron core, the diversion plate is hermetically arranged on the flow channel frame, the permanent magnet is arranged outside the rotor iron core, and the sheath is arranged outside the permanent magnet; Under normal working conditions, the flow channel hole is closed, and the cooling fluid enters the stator through the cooling hole on the motor end cover, and the cooling fluid forms a stator flow path in the stator cavity and the cooling fluid can flow out of the stator and flow into the axial flow path of the casing flow channel formed between the casing oil sleeve and the stator; Under overload working conditions, the flow channel hole is opened, and the cooling fluid can flow into the casing flow channel and the stator through the flow channel hole and the cooling hole to increase the heat dissipation capacity of the high-speed permanent magnet motor.

2. The high-speed permanent magnet motor according to claim 1, wherein The casing oil sleeve includes a casing end cover and a housing; The casing flow channel is arranged between the casing end cover and the housing, a radial through hole communicated with the stator is opened on the housing, and the cooling hole is communicated with the casing flow channel through the radial through hole.

3. The high-speed permanent magnet motor according to claim 2, characterized in that, The radial through hole includes a first radial through hole and a second radial through hole, the first radial through hole and the second radial through hole are respectively arranged at both ends of the casing flow channel and are both communicated with the stator, and a guide strip is arranged between the first radial through hole and the second radial through hole on the casing flow channel.

4. The high-speed permanent magnet motor according to claim 1, characterized in that The flow channel hole includes a liquid inlet hole and a liquid outlet hole, the liquid inlet hole and the liquid outlet hole are respectively arranged at both ends of the casing flow channel and are communicated with the casing flow channel and both the liquid inlet hole and the liquid outlet hole can be sealed.

5. The high-speed permanent magnet motor according to claim 1, characterized in that, The motor end cover includes a left end cover and a right end cover; The left end cover and the right end cover are respectively arranged on both sides of the casing oil sleeve, both the left end cover and the right end cover are connected to the stator, and both the left end cover and the right end cover are hermetically connected to the rotor.

6. The high-speed permanent magnet motor according to claim 5, wherein, The cooling hole includes a cooling inlet hole and a cooling outlet hole; The cooling inlet holes are arranged on the left end cover, and the cooling outlet holes are arranged on the right end cover. Both the cooling inlet holes and the cooling outlet holes are in communication with the stator and the housing flow channels.

7. The high-speed permanent magnet motor according to claim 1, characterized in that The stator includes a stator core, an AC winding, and a stator oil separation sleeve. The stator core is arranged in the housing oil jacket, the AC winding is clamped on the stator core, the stator oil separation sleeve is abutted against the inner surface of the stator core, both ends of the stator oil separation sleeve are hermetically connected to the motor end cover, and the rotor is arranged in the stator oil separation sleeve. A stator flow path is formed between the stator oil separation sleeve and the housing oil jacket, and the stator flow path is in communication with the housing flow channel.

8. The high-speed permanent magnet motor according to claim 1, characterized in that, The flow channel frame includes a flow channel frame connecting shaft, a flow channel frame cooling part, an oil inlet, a flow channel frame radial flow channel, and a flow channel frame axial flow channel. The flow channel frame connecting shaft passes through the motor end cover and is hermetically connected to the motor end cover. An oil inlet is provided at one end of the flow channel frame connecting shaft to introduce a cooling fluid. A flow channel frame radial flow channel is provided at the other end of the flow channel frame connecting shaft. One end of the flow channel frame radial flow channel is in communication with the oil inlet. A flow channel frame axial flow channel is provided on the flow channel frame cooling part. The other end of the flow channel frame radial flow channel is in communication with the flow channel frame axial flow channel. A diversion plate is hermetically arranged at the end of the flow channel frame cooling part. The flow channel frame connecting shaft and the flow channel frame cooling part are integrally formed.

9. The high-speed permanent magnet motor according to claim 8, wherein, The diversion plate includes a diversion plate radial flow channel, diversion plate radial guide strips, and diversion plate stud connection positioning holes. The diversion plate stud connection positioning holes are hermetically connected to the flow channel frame. The diversion plate radial flow channels are formed between adjacent diversion plate radial guide strips to guide the cooling fluid to flow into the shaft cavity of the rotor core.

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