High-speed permanent magnet motor capable of efficiently cooling permanent magnets and windings

Abstract

The utility model discloses a high-speed permanent magnet motor capable of efficiently cooling a permanent magnet and a winding. The high-speed permanent magnet motor comprises a machine base, a rotating assembly and a cooling heat dissipation system, the rotating assembly comprises a rotor and a stator spaced from the rotor; the rotor comprises a rotating shaft, a magnetic steel sleeve, magnetic steel and a carbon fiber protective sleeve which are sequentially sleeved from inside to outside, a rotor axial ventilation slot communicated with the inner cavity of the base is arranged below each group of magnetic steel, and a rotor radial ventilation duct communicated with the rotor axial ventilation slot is arranged in the middle of the rotor; the stator comprises a winding and a stator iron core composed of a plurality of groups of iron core sections with different lengths, and a stator iron core radial ventilating duct is arranged between two adjacent groups of iron core sections; and the cooling heat dissipation system is used for exchanging heat with circulating flowing air in the base. According to the utility model, a symmetrical circulating wind path structure is formed in the motor, and an external water-cooled cooling heat dissipation system is combined to achieve the purposes of improving the internal ventilation heat dissipation effect of the motor and reducing the temperature rise of the winding and the temperature of the rotor magnetic steel.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of high -speed permanent -magnet motor ventilation cooling, especially to a kind of high-speed permanent-magnet motor capable of efficiently cooling permanent magnet and winding. BACKGROUND

[0002] To ensure the stable operation and service life of high-power box-type high-speed permanent-magnet motor, it is necessary to ensure that the maximum temperature of the rotor permanent magnet and winding does not exceed its upper limit value, so as to prevent the rotor permanent magnet from demagnetizing due to excessive temperature and the winding from aging and damaging due to excessive temperature rise. Therefore, how to improve the design scheme of the internal stator core section arrangement and permanent magnet cooling and ventilation of the motor to achieve the purpose of improving the internal ventilation and heat dissipation effect of the motor, reducing the winding temperature rise and rotor magnet temperature is the key topic of the research on high-power box-type high-speed permanent-magnet motor.

[0003] The patent with application number 201922333595.3 and the name of "a ventilation and cooling structure for high-speed permanent-magnet motor" discloses the following technical features: a flow guide ring, an axial flow impeller and a connecting plate are included; the flow guide ring is sleeved inside the shell, the axial flow impeller is fixed on the rotor, the axial flow impeller rotates inside the flow guide ring, the connecting plate is arranged directly below the flow guide ring, and the connecting plate side wall is provided with air passage holes to communicate with the motor bypass air duct; the above-mentioned ventilation and cooling structure, in cooperation with the flow guide ring, the axial flow impeller and the connecting plate, can form two ventilation and cooling channels inside the shell, and can efficiently and directly ventilate and cool the rotor, stator and winding of the high-speed permanent-magnet motor, with the characteristics of good cooling effect, reliable structure and stable performance.

[0004] However, the above technical scheme uses an axial flow impeller to form a cooling channel inside the motor, which is not suitable for ventilation and heat dissipation of long core and high-speed permanent-magnet motor with a speed of 6000 rpm or above.

[0005] The patent with application number 201922357889.X and the name of "a new integrated water cooling system for high-speed permanent-magnet motor" discloses the following technical features: a shell and front and rear end covers arranged at both ends of the shell are included, a first cooling cavity surrounding the entire shell is arranged in the shell body wall, a first flow guide plate is arranged in the first cooling cavity to form a first cooling water channel; a second cooling cavity is arranged in each of the front and rear end covers, a second flow guide plate is arranged in the second cooling cavity to form a second cooling water channel, the second cooling water channel is communicated with the first cooling water channel in the shell through a connecting channel arranged in the front and rear end covers and the shell, and a refrigerant medium inlet and a refrigerant medium outlet are arranged on the side surfaces of the front and rear end covers to communicate with the second cooling cavity. The above technical scheme integrates the shell and end cover for cooling, enhances the cooling effect, greatly improves the operating environment of the ball bearing, prolongs the operating life of the bearing and increases the reliability of the motor.

[0006] However, the above technical solution is only suitable for cooling of compact permanent magnet motor structure, and the stator and rotor cores are not provided with radial air ducts, so it is not suitable for ventilation and cooling of permanent magnets of long core high-power box-type high-speed permanent magnet motor. Content of the utility model

[0007] The utility model discloses a high-speed permanent magnet motor which can efficiently cool permanent magnets and windings, and can form a symmetrical circulating air path structure inside the motor to improve the internal ventilation and heat dissipation effect of the motor, reduce the temperature rise of the windings and the temperature of the rotor magnetic steel, and achieve the purpose of reducing the temperature of the windings and the rotor magnetic steel.

[0008] The utility model adopts the following technical scheme:

[0009] A high-speed permanent magnet motor which can efficiently cool permanent magnets and windings, comprising a base, a rotating assembly arranged in the base, and a cooling and heat dissipation system arranged above the base.

[0010] The rotating assembly comprises a rotor rotatably connected to the base at both ends, and a stator arranged around the rotor with a gap between the rotor and the stator. The rotor comprises a rotating shaft, a magnetic steel sleeve, magnetic steel, and a carbon fiber protective sleeve arranged in sequence from inside to outside. Each group of magnetic steel is provided with a rotor axial ventilation groove in communication with the inner cavity of the base. Each group of magnetic steel is in contact with the opening of the rotor axial ventilation groove at the corresponding position. The middle part of the rotor is provided with a rotor radial ventilation duct in communication with the rotor axial ventilation groove. The stator comprises a winding and a stator core composed of several groups of different length core segments. The adjacent two groups of core segments are provided with a stator core radial ventilation duct.

[0011] The cooling and heat dissipation system is used for heat exchange with the circulating air in the base, and the circulating air flows through the winding end, the air gap between the rotor and the stator, the stator core radial ventilation duct, the back of the stator core, the rotor axial ventilation groove, and / or the rotor radial ventilation duct.

[0012] The outer circumferences of the left and right ends of the winding are respectively provided with a left baffle and a right baffle connected to the inner wall of the base.

[0013] The stator core is connected to the inner wall of the base through a reinforcing rib. The left and right ends of the stator core are respectively provided with a left tooth pressing plate and a right tooth pressing plate. The outer sides of the two end tooth pressing plates are respectively provided with a left support plate and a right support plate connected to the inner wall of the base. The upper part of the stator core between the left support plate and the right support plate is uniformly provided with several partitions. The two end support plates and the partitions are provided with corresponding ventilation holes along the left and right directions. The outer circumferences of the left and right tooth pressing plates are provided with annular wind barriers between the stator core and the corresponding side support plates.

[0014] The adjacent two groups of core segments are provided with ventilation groove steel to form the stator core radial ventilation duct.

[0015] The rotating shaft adopts left-right symmetrical stepped shaft, the outer diameter of the middle part of the rotating shaft is the largest, two groups of magnetic steel sleeves are symmetrically arranged in the middle part of the rotating shaft, and the gap between the two groups of magnetic steel sleeves forms a rotor radial ventilation channel.

[0016] The outer circumferences of the two groups of left-right symmetrical magnetic steel sleeves are provided with a plurality of groups of magnetic steels, a plurality of magnetic separation strips are uniformly arranged between the plurality of groups of magnetic steels, and a carbon fiber protective sleeve is arranged on the outer surfaces of the magnetic steels and the magnetic separation strips; the left and right ends of each group of magnetic steel sleeves are provided with rotor retaining rings, the rotor retaining rings are circumferentially provided with ventilation slots corresponding to the rotor axial ventilation slots, and each rotor retaining ring is connected with the rotating shaft through an arc-shaped key.

[0017] The left and right ends of the rotating shaft are rotatably connected with the machine base through left and right bearing devices, respectively, and the left and right ends of the machine base are provided with left and right end covers, respectively, and the left and right end covers are connected with the machine base through left and right end plates, respectively.

[0018] The plurality of groups of iron core segments on the stator core are arranged left-right symmetrically, the length of the middle iron core segment is smaller than that of the end iron core segment, and the total length of the three groups of iron core segments at the outer end of each side accounts for more than 35% of the total length of the corresponding side.

[0019] The cooling and heat dissipation system comprises air-water coolers and left and right forced air fans; the air-water coolers comprise left and right cooler cores which are in communication with external water stations; the air inlets of the left and right forced air fans are in communication with the air outlets of the corresponding cooler cores, the air outlets of the left and right forced air fans are in communication with the left and right sides of the inner cavity of the machine base through the machine base air inlets, and the air inlets of the left and right cooler cores are in communication with the upper part of the inner cavity of the machine base through the machine base air outlets.

[0020] The high-pressure cooling air generated by the left and right forced air fans enters the inner cavity of the machine base from top to bottom through the corresponding machine base air inlets and forms two left-right symmetrical circulating air paths, and each circulating air path corresponds to three ventilation branch paths:

[0021] Ventilation branch path 1: the high-pressure cooling air flows into the back of the stator core through the corresponding side baffle, the corresponding side winding end, the corresponding side branch plate and the corresponding side partition plate in sequence, and finally enters the air inlet of the corresponding cooler core through the machine base air outlet;

[0022] Ventilation branch path 2: the high-pressure cooling air flows into the back of the stator core through the corresponding side baffle, the corresponding side winding end, the air gap and the stator core radial ventilation channel in sequence, and finally enters the air inlet of the corresponding cooler core through the machine base air outlet after heat exchange with the stator core and the winding;

[0023] Ventilation branch 3: high pressure cooling air passes through corresponding side baffle, corresponding side winding end, corresponding side rotor baffle and rotor axial ventilation groove in turn, enters rotor radial ventilation channel after heat exchange with magnetic steel sleeve, magnetic steel and carbon fiber protective sleeve, then enters stator core radial ventilation channel from left and right sides through air gap, enters stator core back after heat exchange with stator core and winding, and finally enters the air inlet of corresponding side cooler core through the air outlet of machine base.

[0024] The utility model discloses a rotor with rotor axial ventilation groove and rotor radial ventilation channel, a stator with stator core radial ventilation channel and composed of several groups of different length core segments, and a cooling system for heat exchange of circulating air in the machine base, which fully utilizes the air gap between the rotor and the stator, the stator core radial ventilation channel, the rotor axial ventilation groove and / or the rotor radial ventilation channel to effectively and forcibly cool the winding, the stator core, the magnetic steel sleeve and the magnetic steel, thereby improving the cooling efficiency of the motor, reducing mechanical loss, and achieving the purpose of reducing the winding temperature rise and the rotor magnetic steel temperature.

[0025] The utility model discloses a rotor axial ventilation groove is set up on the magnetic steel sleeve, the surface of each magnetic steel is directly contacted with corresponding rotor axial ventilation groove, which can effectively avoid the occurrence of thermal resistance, strengthen the convective heat transfer capacity at the magnetic steel, improve the cooling effect of the magnetic steel sleeve, the magnetic steel and the carbon fiber protective sleeve, and greatly improve the thermal load capacity of the permanent magnet motor.

[0026] The several groups of core segments on the stator core are symmetrically arranged left and right, the length of the middle core segment is less than the length of the end core segment, and the total length of the three groups of core segments at the outer end of each side accounts for more than 35% of the total length of the corresponding side, which can ensure the winding temperature rise of the stator and shorten the temperature difference of the stator part. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 It is a structural schematic view of the utility model;

[0028] Fig. 2 It is a cooperation schematic view of the rotor and the stator in the utility model;

[0029] Fig. 3 It is a structural schematic view of the rotor in the utility model;

[0030] Fig. 4 It is a position relation schematic view of the magnetic steel sleeve, the magnetic steel, the magnetic separation strip and the carbon fiber protective sleeve in the utility model. DETAILED DESCRIPTION

[0031] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments of the present application shall fall within the scope of the present application.

[0032] As shown in Figs. 1 to 4 The high-speed permanent magnet motor capable of efficiently cooling the permanent magnet and the winding 9 comprises a base 1, a rotating assembly arranged in the base 1, and a cooling and heat dissipation system arranged above the base 1.

[0033] The rotating assembly comprises a rotor 2 rotatably connected to the base 1 at both ends, and a stator arranged on the outer periphery of the rotor 2 and spaced from the rotor 2.

[0034] The rotor 2 comprises a rotating shaft 3, a magnetic steel sleeve 4, a magnetic steel 5 and a carbon fiber protective sleeve 6 arranged in sequence from inside to outside, and each group of magnetic steel 5 is provided with a rotor axial ventilation groove 7 communicated with the inner cavity of the base 1, and each group of magnetic steel 5 is in contact with the opening of the rotor axial ventilation groove 7 at the corresponding position, and the middle part of the rotor 2 is provided with a rotor radial ventilation channel 8 communicated with the rotor axial ventilation groove 7.

[0035] The stator comprises a winding 9 and a stator core 10 composed of a plurality of groups of different length core segments, and a stator core radial ventilation channel 11 is arranged between the adjacent two groups of core segments.

[0036] The cooling and heat dissipation system is used for heat exchange with the circulating flowing air in the base 1 as a cooling medium, and the circulating flowing air flows through the end part of the winding 9, the air gap formed between the rotor 2 and the stator, the stator core radial ventilation channel 11, the back of the stator core 10, the rotor axial ventilation groove 7 and / or the rotor radial ventilation channel 8.

[0037] The present application can utilize the rotor 2 provided with the rotor axial ventilation groove 7 and the rotor radial ventilation channel 8, supplemented by the stator core 10 composed of a plurality of groups of different length core segments and provided with the stator core radial ventilation channel 11, matched with the cooling and heat dissipation system for heat exchange with the circulating flowing air in the base 1, fully utilizing the air gap formed between the rotor 2 and the stator, the stator core radial ventilation channel 11, the rotor axial ventilation groove 7 and / or the rotor radial ventilation channel 8 to form a plurality of ventilation air paths, and effectively forcedly cooling the winding 9, the stator core 10, the magnetic steel sleeve 4 and the magnetic steel 5, so as to improve the heat dissipation efficiency of the motor, reduce the mechanical loss, and achieve the purpose of reducing the winding temperature rise and the rotor magnetic steel temperature.

[0038] The utility model discloses, through setting up rotor axial ventilation flue 7 on the magnetic steel cover 4, the surface of each magnetic steel 5 is directly contacted with corresponding one rotor axial ventilation flue 7, can effectively avoid the emergence of thermal resistance, strengthen the convection heat transfer capacity at the magnetic steel 5, improve the cooling effect of magnetic steel cover 4, magnetic steel 5 and carbon fiber protective sleeve 6, and further substantially improve the thermal load capacity of permanent magnet motor.

[0039] In order to further optimize the path of circulating air path in the frame 1, improve the cooling effect, the utility model discloses that the outer circle outside of the winding 9 left and right two ends is provided with left baffle 12 and right baffle 13 connected with the inner wall of frame 1. Left baffle 12 and right baffle 13 can ensure that the circulating flow air entering the inner cavity of frame 1 from left and right sides can cool the end of winding 9;At the same time, left baffle 12 and right baffle 13 can also adjust the path of circulating air path, to form the set two-way symmetrical circulating air path with air gap, stator core radial ventilation channel 11, rotor axial ventilation flue 7 and / or rotor radial ventilation channel 8.

[0040] In the utility model, the stator core 10 can form stable connection with the inner wall of frame 1 through the reinforcing rib 14, and the left and right ends of the stator core 10 are respectively provided with left tooth pressing plate 15 and right tooth pressing plate 16 for effectively limiting the silicon steel sheet;The outer sides of the two end tooth pressing plates are respectively provided with left support plate 17 and right support plate 18 connected with the inner wall of frame 1, and the upper part of the stator core 10 between the left support plate 17 and the right support plate 18 is also uniformly provided with a plurality of partition plates 19, and the ventilation holes 20 corresponding in position are arranged on the two end support plates and the partition plates 19 in the left-right direction;And the outer circumferences of the left tooth pressing plate 15 and the right tooth pressing plate 16 are provided with annular wind barriers 21 located between the stator core 10 and the corresponding side support plates.

[0041] In the above-mentioned stator core 10 structure, the design of the left support plate 17, the right support plate 18 and the plurality of partition plates 19 can further strengthen the connection stability of the stator core 10, and form the circulating air path of the specified path by using the ventilation holes 20, and finally form the two-way symmetrical circulating air path. The ventilation holes 20 arranged on the two end support plates and the partition plates 19 can also effectively reduce the air resistance in the motor, and facilitate the selection of the air-water cooler 33;The arrangement of the annular wind barriers 21 can effectively block the circulating flow air from flowing away from the gap, and ensure that the stator and the rotor 2 can obtain sufficient air volume for heat exchange.

[0042] In the utility model, two adjacent groups of core segments in the stator core 10 are provided with ventilation channel steel 22 to form a stator core radial ventilation channel 11. The width of the ventilation channel steel 22 can be 8mm, which is slightly smaller than the stator core radial ventilation channel 11 of other structures and sizes in the prior art, so that the number of the stator core radial ventilation channel 11 can be increased under the premise of ensuring the motor wind resistance, so as to increase the heat exchange area of the stator part and the airflow, and further reduce the temperature of the stator.

[0043] In order to realize the stable installation of the rotor 2 and the optimization of the structure of the rotor 2, in the utility model, the rotating shaft 3 adopts a left-right symmetrical stepped shaft, the outer diameter of the two ends of the rotating shaft 3 is small, which is convenient for forming a rotating connection with the bearing device and the machine base 1; the outer diameter of the middle part of the rotating shaft 3 is the largest, which is used for cooperating with the magnetic steel sleeve 4 and the magnetic steel 5 to form a rotor axial ventilation groove 7. In the embodiment, two groups of magnetic steel sleeves 4 are symmetrically arranged in the middle part of the rotating shaft 3, and the gap between the two groups of magnetic steel sleeves 4 forms a rotor radial ventilation channel 8. The outer circumferences of the two groups of magnetic steel sleeves 4 are provided with a plurality of groups of magnetic steels 5, and a plurality of magnetic separation strips 23 are also uniformly arranged between the plurality of groups of magnetic steels 5. The carbon fiber protective sleeve 6 is arranged on the outer surfaces of the magnetic steels 5 and the magnetic separation strips 23. The left and right ends of each group of magnetic steel sleeves 4 are provided with a rotor retaining ring 25, and each rotor retaining ring 25 is connected with the rotating shaft 3 through an arc-shaped key 26. In the above design, the left and right groups of magnetic steel sleeves 4, the magnetic steels 5, the magnetic separation strips 23 and the carbon fiber protective sleeves 6 arranged on the outer circumferences of the magnetic steel sleeves 4 form a left-right symmetrical structure with the rotor radial ventilation channel 8 as the symmetrical axis, and finally form a symmetrical circulating air path structure in the machine base 1 in cooperation with the left and right air baffles 12 and 13.

[0044] In order to ensure the effective communication between the two ends of the rotor axial ventilation groove 7 and the inner cavity of the machine base 1, the rotor retaining ring 25 is provided with a ventilation slot 24 corresponding to the rotor axial ventilation groove 7 along the circumference, and the two ends of each rotor axial ventilation groove 7 are connected with the inner cavity of the machine base 1 through the ventilation slot 24 arranged on the rotor retaining ring 25 to form a ventilation air path.

[0045] In the utility model, the left and right ends of the rotating shaft 3 are rotatably connected with the machine base 1 through the left bearing device 27 and the right bearing device 28 respectively, the left end cover 29 and the right end cover 30 are arranged on the machine base 1 at the positions of the left bearing device 27 and the right bearing device 28 respectively, and the left end cover 29 and the right end cover 30 are connected with the machine base 1 through the left end plate 31 and the right end plate 32 respectively. The left bearing device 27 and the right bearing device 28 can adopt tilting pad high-speed bearings, which have the advantages of strong bearing capacity, good impact resistance and adjustable angle with the machine base 1, and can be applied to the application scene of high-power high-speed permanent magnet motor due to the characteristics of bearing high-speed rotation and load.

[0046] In the utility model, the several groups of iron core sections on the stator core 10 are arranged left and right symmetrically, the length of the middle iron core section is less than the length of the end iron core section, and the total length of the three groups of iron core sections on each side is more than 35% of the total length of the corresponding side, so that the temperature rise of the stator winding 9 and the temperature difference of the stator part are ensured.

[0047] In the embodiment, the stator core 10 is composed of 27 groups of iron core sections, the 14th group of iron core sections in the middle is located in the middle of the stator core 10, and 13 groups of iron core sections are symmetrically arranged on the left and right sides of the 14th group of iron core sections; wherein the length of each iron core section in the three groups of iron core sections (namely the 1st-3rd groups and the 25th-27th groups) near the end of the stator core 10 is consistent and is the longest in all the iron core sections, the length of each iron core section in the 14th group of iron core sections in the middle and the 5 groups of iron core sections on the left and right sides (namely the 9th-13th groups and the 15th-19th groups) is consistent and is the shortest in all the iron core sections; the length of each iron core section in the 5 groups of iron core sections in the middle on each side (namely the 4th-8th groups and the 20th-24th groups) is consistent and is in the middle among all the iron core sections, that is, the length is less than the length of the longest iron core section and greater than the length of the shortest iron core section. The total length of the three groups of iron core sections near the end of the stator core 10 is more than 35% of the distance from the outermost end of the stator core 10 to the middle of the 14th group of iron core sections.

[0048] In order to cooperate with the symmetrical circulating air path structure constructed and improve the internal ventilation and heat dissipation effect of the motor, in the utility model, the cooling and heat dissipation system adopts the design idea of combining two independent cooling structures of external water cooling and internal air cooling symmetrical circulating air path, and specifically includes an air-water cooler 33 and left and right side forced air fans; the air-water cooler 33 includes a left side cooler core 34 and a right side cooler core 35 which are in communication with an external water station; the air inlets of the left side forced air fan 36 and the right side forced air fan 37 are in communication with the air outlets of the corresponding side cooler cores, the air outlets of the left and right side forced air fans are in communication with the left and right sides of the inner cavity of the machine base 1 through the air inlets of the machine base 1, and the air inlets of the left and right side cooler cores are in communication with the upper part of the inner cavity of the machine base 1 through the air outlets of the machine base 1.

[0049] The external water cooling is that the cooling water in the external water station enters the cooling pipes of the left side cooler core 34 and the right side cooler core 35 through the water inlets of the air-water cooler 33, convective heat exchange is carried out between the outer walls of the cooling pipes and the cooling fins and the hot air inside the machine base 1, the cooling water with the temperature increased is transported to the external water station to be cooled through the water outlets of the air-water cooler 33, an external water path circulation is formed, and the purpose of reducing the temperature of the internal cooling medium, that is, the circulating air, is achieved.

[0050] The internal air cooling symmetrical circulating air path is that the high-pressure cooling air generated by the rotation of the left and right side forced air fans enters the inner cavity of the machine base 1 from top to bottom through the air inlets of the corresponding side machine base 1 and forms two symmetrical circulating air paths, and each circulating air path corresponds to three ventilation branch paths:

[0051] Ventilation branch 1: high pressure cooling air flows into the back of the stator core 10 through the corresponding side baffle, the corresponding side winding 9 end, the corresponding side branch plate and the corresponding side partition plate 19 in turn, and finally enters the corresponding side cooler core inlet through the machine base 1 outlet;

[0052] Ventilation branch 2: high pressure cooling air flows into the back of the stator core 10 through the corresponding side baffle, the corresponding side winding 9 end, the air gap and the stator core radial ventilation channel 11 in turn, and finally enters the corresponding side cooler core inlet through the machine base 1 outlet;

[0053] Ventilation branch 3: high pressure cooling air flows into the back of the stator core 10 through the corresponding side baffle, the corresponding side winding 9 end, the corresponding side rotor baffle 25 and the rotor axial ventilation groove 7 in turn, and finally enters the corresponding side cooler core inlet through the machine base 1 outlet.

[0054] The high pressure cooling air carrying heat entering the corresponding side cooler core is cooled by sufficient convective heat exchange of the cooling fins and the cooling pipe outer wall, and then reenters the machine base 1 under the rotation of the two side forced air blowers, thereby forming an internal circulation loop.

[0055] The utility model discloses a wind path structure of the existing high-speed permanent magnet motor, which is characterized in that a rotor axial ventilation groove 7 is arranged on the magnetic steel sleeve 4 at the position where the magnetic steel 5 is attached. The heat conduction thermal resistance can be effectively avoided, the convective heat exchange capacity at the position of the magnetic steel 5 is strengthened, the cooling effect of the magnetic steel 5 and the carbon fiber protective sleeve 6 is improved, the thermal load capacity of the permanent magnet motor is greatly improved, the motor power can be increased by 2-3 grades, the motor size is reduced, the motor material is saved, and the cost is low.

[0056] The utility model discloses a wind path structure of the existing high-speed permanent magnet motor, which is characterized in that a rotor axial ventilation groove 7 is arranged on the magnetic steel sleeve 4 at the position where the magnetic steel 5 is attached. The heat conduction thermal resistance can be effectively avoided, the convective heat exchange capacity at the position of the magnetic steel 5 is strengthened, the cooling effect of the magnetic steel 5 and the carbon fiber protective sleeve 6 is improved, the thermal load capacity of the permanent magnet motor is greatly improved, the motor power can be increased by 2-3 grades, the motor size is reduced, the motor material is saved, and the cost is low.

Claims

1. A high-speed permanent magnet motor capable of efficiently cooling a permanent magnet and a winding, characterized by: The machine base, the rotating assembly arranged in the machine base, and the cooling system arranged above the machine base are provided; The rotating assembly comprises a rotor rotatably connected to the machine base at both ends and a stator arranged around the rotor with a gap between the rotor and the stator; the rotor comprises a rotating shaft, a magnetic steel sleeve, a magnetic steel and a carbon fiber protective sleeve arranged in sequence from inside to outside; an axial ventilation groove of the rotor is arranged below each group of magnetic steel and communicates with the inner cavity of the machine base; each group of magnetic steel is in contact with the opening of the axial ventilation groove of the rotor at the corresponding position; a radial ventilation channel of the rotor is arranged in the middle of the rotor and communicates with the axial ventilation groove of the rotor; the stator comprises a winding and a stator core composed of a plurality of groups of iron core segments with different lengths; a radial ventilation channel of the stator core is arranged between the adjacent two groups of iron core segments. The cooling system exchanges heat with the circulating air in the machine base, and the circulating air flows through the winding end, the air gap between the rotor and the stator, the radial ventilation channel of the stator core, the back of the stator core, the axial ventilation groove of the rotor and / or the radial ventilation channel of the rotor.

2. The high-speed permanent magnet motor capable of efficiently cooling the permanent magnets and the windings according to claim 1, characterized in that: The outer circumferences of the left and right ends of the winding are respectively provided with left and right wind baffles connected to the inner wall of the machine base.

3. The high-speed permanent-magnet motor capable of efficiently cooling a permanent magnet and a winding according to claim 1, characterized by: The stator core is connected to the inner wall of the machine base through a reinforcing rib; the left and right ends of the stator core are respectively provided with left and right tooth pressing plates; the outer sides of the two end tooth pressing plates are respectively provided with left and right support plates connected to the inner wall of the machine base; a plurality of partitions are uniformly arranged on the upper part of the stator core between the left and right support plates; ventilation holes corresponding in position are arranged on the two end support plates and the partitions in the left-right direction; and annular wind baffles are arranged between the stator core and the corresponding side support plates at the outer circumferences of the left and right tooth pressing plates.

4. The high-speed permanent-magnet motor capable of efficiently cooling a permanent magnet and a winding according to claim 1, characterized by: The radial ventilation channel of the stator core is formed between the adjacent two groups of iron core segments by arranging a ventilation groove steel.

5. The high-speed permanent-magnet motor capable of efficiently cooling permanent magnets and windings according to claim 1, characterized by: The rotating shaft adopts a left-right symmetrical stepped shaft, and the outer diameter of the middle part of the rotating shaft is the largest; two groups of magnetic steel sleeves are symmetrically arranged in the middle part of the rotating shaft, and the gap between the two groups of magnetic steel sleeves forms the radial ventilation channel of the rotor.

6. The high-speed permanent-magnet motor capable of efficiently cooling a permanent magnet and a winding according to claim 4, characterized by: The outer circumferences of the two groups of left-right symmetrical magnetic steel sleeves are respectively provided with a plurality of groups of magnetic steels; a plurality of magnetic separation strips are uniformly arranged between the plurality of groups of magnetic steels; and the carbon fiber protective sleeve is arranged on the outer surfaces of the magnetic steels and the magnetic separation strips; the left and right ends of each group of magnetic steel sleeves are respectively provided with rotor retaining rings; the rotor retaining rings are circumferentially provided with ventilation grooves corresponding to the axial ventilation grooves of the rotor; and each rotor retaining ring is connected to the rotating shaft through an arc-shaped key.

7. The high-speed permanent-magnet motor capable of efficiently cooling permanent magnets and windings according to claim 1, characterized by: The left and right ends of the rotating shaft are respectively rotatably connected to the machine base through left and right bearing devices; the left and right ends of the machine base are respectively provided with left and right end covers; and the left and right end covers are respectively connected to the machine base through left and right end plates.

8. The high-speed permanent-magnet motor capable of efficiently cooling permanent magnets and windings according to claim 1, characterized by: The plurality of groups of iron core segments on the stator core are left-right symmetrical; the length of the middle iron core segment is less than the length of the end iron core segment; and the total length of the three groups of iron core segments at the outer end of each side accounts for more than 35% of the total length of the corresponding side.

9. The high-speed permanent-magnet motor capable of efficiently cooling a permanent magnet and a winding according to claim 3, characterized by: The cooling heat dissipation system comprises air-water coolers and forced air fans on left and right sides; the air-water coolers comprise left and right cooler cores in communication with external water stations; air inlets of the forced air fans on the left and right sides are in communication with air outlets of the corresponding cooler cores; air outlets of the forced air fans on the left and right sides are in communication with left and right sides of the inner cavity of the machine base through machine base air inlets; air inlets of the left and right cooler cores are in communication with the upper part of the inner cavity of the machine base through machine base air outlets.

10. The high-speed permanent-magnet motor capable of efficiently cooling the permanent magnets and the windings according to claim 9, characterized in that: High-pressure cooling air generated by the forced air fans on the left and right sides enters the inner cavity of the machine base from top to bottom through the corresponding machine base air inlets and forms two symmetrical circulating air paths, and each circulating air path corresponds to three air ventilation branches: Air ventilation branch 1: high-pressure cooling air flows into the back of the stator core through the corresponding winding end, the corresponding side plate and the corresponding side partition in sequence, and finally enters the air inlet of the corresponding cooler core through the machine base air outlet; Air ventilation branch 2: high-pressure cooling air flows into the back of the stator core through the corresponding winding end, the air gap and the radial ventilation channel of the stator core in sequence, and finally enters the air inlet of the corresponding cooler core through the machine base air outlet; Air ventilation branch 3: high-pressure cooling air flows into the radial ventilation channel of the rotor through the corresponding winding end and the axial ventilation groove of the rotor in sequence, and finally enters the air inlet of the corresponding cooler core through the machine base air outlet.

Images