A hybrid cooling axial flux permanent magnet motor

Abstract

The present invention discloses a hybrid cooling axial flux permanent magnet motor, which relates to the field of motors. Conventional axial flux permanent magnet motors are mainly cooled by air cooling, which has low cooling efficiency and is not suitable for working fields requiring lightweight. The present invention includes a stator and an outer rotor, wherein the outer rotor includes left and right magnetic steel mounting plates, a rotor shell, and magnetic steel. The stator is located inside the rotor, and the stator includes a stator core, a core bracket, and a stator winding. The stator core is connected and fixed to the stator core support shaft through the core bracket. Axial air inlets are provided on the left and right magnetic steel mounting plates, radial air outlets are provided on the rotor shell, and a liquid cooling channel for cooling the stator core is provided on the core bracket. The hybrid cooling method of air cooling and liquid cooling improves the cooling efficiency of the motor, can effectively take away the heat generated inside the rotor and stator, has a compact overall structure, effectively improves the cooling effect without increasing the volume of the motor, improves the power density, and realizes lightweight application.

Description

Technical Field

[0001] The invention relates to the field of motors, and in particular to a hybrid cooling axial flux permanent magnet motor. Background Art

[0002] At present, the disc-type axial flux permanent magnet motor has the advantages of compact structure, light weight, small size, high peak torque, stable operation, etc., and has broad application prospects in the field of electric aviation. However, traditional axial flux permanent magnet motors are mainly cooled by air cooling, which has low cooling efficiency and cannot increase power density while maintaining volume and weight. It cannot meet actual usage needs and is not suitable for work fields that require lightweight. Summary of the invention

[0003] The technical problem to be solved and the technical task proposed by the present invention are to improve and perfect the existing technical solutions and provide a hybrid cooling axial flux permanent magnet motor, so as to effectively improve the heat dissipation effect without increasing the volume. To this end, the present invention adopts the following technical solutions.

[0004] A hybrid cooling axial flux permanent magnet motor comprises a stator and an outer rotor, wherein the outer rotor comprises a left magnetic steel mounting plate, a right magnetic steel mounting plate, and a rotor shell located between the outer peripheries of the left magnetic steel mounting plate and the right magnetic steel mounting plate, the inner sides of the left magnetic steel mounting plate and the right magnetic steel mounting plate are uniformly distributed with magnetic steel, the stator is located inside the rotor, the stator comprises a stator core, a core bracket arranged on both axial sides of the stator core, and a stator winding arranged on the stator core, the stator core is connected and fixed to a stator core support shaft through the core bracket, the left magnetic steel mounting plate and the right magnetic steel mounting plate are rotatably connected to the two ends of the stator core support shaft on the axial outer sides of the two core brackets, a running gap exists between the stator and the outer rotor, the left magnetic steel mounting plate and the right magnetic steel mounting plate are provided with axially uniformly distributed axial air inlet holes, the rotor shell is provided with radially uniformly distributed air outlet holes, and the core bracket is provided with a liquid cooling channel for cooling the stator core.

[0005] The cooling air enters through the air inlet, passes through the gap inside the motor, cools the inside of the motor, and finally exits through the air outlet, thus conveniently realizing air cooling. Through the liquid cooling channel on the core bracket, liquid cooling of the adjacent stator core can be conveniently realized. The mixed cooling method of air cooling and liquid cooling improves the cooling efficiency of the motor and reduces the weight of the motor to a certain extent. The overall structure has a small number of parts and a compact structure. The mixed cooling method has high efficiency and good heat dissipation capacity, which can effectively take away the heat generated inside the rotor and stator, and effectively improve the cooling effect without increasing the volume of the motor. The overall structure of the motor is compact and reasonable, and can effectively realize lightweight applications.

[0006] As a preferred technical means: the core support includes an annular support fixing part and support ribs evenly distributed outside the support fixing part, the liquid cooling channel is arranged on each support rib and connected in series, the inner hole of the support fixing part matches the support fixing block of the stator core support shaft, and the support fixing part is fixed to the support fixing plate of the stator core support shaft by bolt connection. It is convenient to realize the arrangement of the liquid cooling channel and realize the connection and fixation of the core support and the stator core support shaft.

[0007] As a preferred technical means: each core unit of the stator core has a dovetail structure on both sides of the winding, and a bracket slot is formed between the dovetail structures of two adjacent core units. The bracket slot matches the shape and size of the bracket ribs. The outer sides of the bracket ribs and the stator core are provided with a core pressing block, which is fixed to the outer end of the bracket ribs by screw connection. The dovetail slot wedge matching structure and the core pressing block can effectively achieve the connection and fixation of the stator core.

[0008] As a preferred technical means: the stator core support shaft is a hollow shaft, and the stator core support shaft is provided with a stator winding inlet and outlet and a liquid cooling channel inlet and outlet, which can facilitate the entry and exit of the winding lead wire and the liquid cooling channel.

[0009] As a preferred technical means: the stator core is formed by laminating silicon steel sheets or pressing iron powder, and adopts conventional manufacturing methods with mature technology and low cost.

[0010] As a preferred technical means: the inner sides of the left magnetic steel mounting plate and the right magnetic steel mounting plate are both rotatably connected to the stator core support shaft through bearings, so as to conveniently realize the rotatable connection.

[0011] As a preferred technical means: the magnetic steel is compressed by a magnetic steel pressing block and fixed by screw connection. The fixing is simple and convenient.

[0012] As a preferred technical means: the radial inner and outer sides of the magnetic steel are provided with an inclination, and the magnetic steel pressing block matches the inclination. By pressing with the inclination, the fixing structure can be effectively simplified.

[0013] As a preferred technical means: each magnetic steel is made up of multiple small magnetic steel bodies bonded and spliced ​​by insulating glue, which can effectively reduce the eddy current loss of the magnetic steel.

[0014] As a preferred technical means: the two ends of the rotor shell are positioned and connected with the magnetic steel mounting plates on both sides through stoppers, and fixed by screw connection. The stoppers are matched and connected with screws, which is convenient for positioning, installation and disassembly.

[0015] Beneficial effects: The mixed cooling method of air cooling and liquid cooling improves the cooling efficiency of the motor and reduces the weight of the motor to a certain extent. The overall structure has a small number of parts and a compact structure. The mixed cooling method has high efficiency and good heat dissipation capacity, which can effectively take away the heat generated inside the rotor and stator, and effectively improve the cooling effect without increasing the volume of the motor. The overall structure of the motor is compact and reasonable, which can effectively realize lightweight applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the radial cross-sectional structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the stator structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the arrangement of the stator core and stator winding of the present invention.

[0019] Figure 4 It is a schematic diagram of the core support structure of the present invention.

[0020] Figure 5 It is a schematic diagram of the stator core support shaft structure of the present invention.

[0021] In the figure: 1-left magnetic steel mounting plate; 2-right magnetic steel mounting plate; 3-rotor shell; 4-magnet; 5-statator core; 6-core bracket; 7-stator winding; 8-stator core support shaft; 9-magnetic steel block; 10-core block; 101-air inlet; 301-air outlet; 601-liquid cooling channel; 602-bracket fixing part; 603-bracket rib; 801-bracket fixing gear; 802-bracket fixing plate; 803-liquid cooling channel entrance and exit; 804-stator winding entrance and exit. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0023] like Figure 1-5As shown, a hybrid cooling axial flux permanent magnet motor includes a stator and an outer rotor, the outer rotor includes a left magnetic steel mounting plate 1, a right magnetic steel mounting plate 2, and a rotor shell 3 located between the outer peripheries of the left magnetic steel mounting plate 1 and the right magnetic steel mounting plate 2, and magnetic steels 4 are evenly distributed around the inner sides of the left magnetic steel mounting plate 1 and the right magnetic steel mounting plate 2. The stator is located inside the rotor, and the stator includes a stator core 5, a core bracket 6 arranged on both axial sides of the stator core 5, and a stator winding 7 arranged on the stator core 5. The stator core 5 It is connected and fixed to the stator core support shaft 8 through the core bracket 6, the left magnetic steel mounting plate 1 and the right magnetic steel mounting plate 2 are rotatably connected to the two ends of the stator core support shaft 8 axially outside the two core brackets 6, and there is a running gap between the stator and the outer rotor, the left magnetic steel mounting plate 1 and the right magnetic steel mounting plate 2 are provided with axial air inlet holes 101 evenly distributed around, the rotor shell 3 is provided with radial air outlet holes 301 evenly distributed around, and the core bracket 6 is provided with a liquid cooling channel 601 for cooling the stator core 5.

[0024] In order to realize the connection and fixation of liquid cooling and the core support 6, the core support 6 includes an annular support fixing portion 602 and support ribs 603 evenly distributed on the outside of the support fixing portion 602, a liquid cooling channel 601 is provided on each support rib 603, and connected in series, the inner hole of the support fixing portion 602 matches the support fixing block 801 of the stator core support shaft 8, and the support fixing portion 602 is fixed to the support fixing plate 802 of the stator core support shaft 8 by bolt connection. It is convenient to realize the arrangement of the liquid cooling channel 601 and realize the connection and fixation of the core support 6 and the stator core support shaft 8.

[0025] In order to achieve the connection and fixation of the stator core 5, each core unit of the stator core 5 has a dovetail structure on both sides of the winding, and a bracket slot is formed between the dovetail structures of two adjacent core units. The bracket slot matches the shape and size of the bracket rib 603. The outer side of the bracket rib 603 and the stator core 5 is provided with a core pressing block 10, and the core pressing block 10 is fixed to the outer end of the bracket rib 603 by screw connection. Through the matching structure of the dovetail slot wedge and the core pressing block 10, the connection and fixation of the stator core 5 can be effectively achieved.

[0026] To facilitate the entry and exit of the winding lead wire and the coolant, the stator core support shaft 8 is a hollow shaft, and the stator core support shaft 8 is provided with a stator winding inlet and outlet 804 and a liquid cooling channel inlet and outlet 803. The entry and exit of the winding lead wire and the coolant can be facilitated.

[0027] For the convenience of manufacturing, the stator core 5 is formed by laminating silicon steel sheets. Conventional manufacturing methods are convenient to manufacture, mature in technology, and low in cost. In this example, iron powder pressing can also be used instead of laminating silicon steel sheets.

[0028] In order to realize the rotatable connection, the inner sides of the left magnetic steel mounting plate 1 and the right magnetic steel mounting plate 2 are rotatably connected to the stator core support shaft 8 through bearings, so as to conveniently realize the rotatable connection.

[0029] In order to fix the magnetic steel 4, the magnetic steel 4 is pressed by the magnetic steel pressing block 9 and fixed by screw connection. The fixing is simple and convenient.

[0030] In order to simplify the fixing structure, the radial inner and outer sides of the magnetic steel 4 are provided with an inclination, and the magnetic steel pressing block 9 matches the inclination. By pressing with the inclination, the fixing structure can be effectively simplified.

[0031] In order to reduce the eddy current loss of the magnetic steel 4 , each magnetic steel 4 is formed by splicing a plurality of small magnetic steel 4 bodies by bonding with insulating glue, which can effectively reduce the eddy current loss of the magnetic steel 4 .

[0032] In order to facilitate positioning and installation, the two ends of the rotor shell 3 are positioned and connected with the magnetic steel 4 mounting plates on both sides through stoppers, and fixed by screw connection. The stoppers are matched and connected with screws, which is convenient for positioning, installation and disassembly.

[0033] When the motor is working, cooling air enters through the air inlet 101, passes through the gap inside the motor, cools the inside of the motor, and finally exits through the air outlet 301, conveniently realizing air cooling. The coolant flows through the liquid cooling channel 601 on the core bracket 6, which can conveniently realize liquid cooling of the adjacent stator core 5. The mixed cooling method of air cooling and liquid cooling improves the cooling efficiency of the motor and also reduces the weight of the motor to a certain extent. The overall structure has a small number of parts and a compact structure. The mixed cooling method is efficient and has good heat dissipation capacity. It can effectively take away the heat generated inside the rotor and stator, and effectively improve the cooling effect without increasing the volume of the motor. The overall structure of the motor is compact and reasonable, and can effectively realize lightweight applications.

[0034] above Figure 1-5 The hybrid cooling axial flux permanent magnet motor shown is a specific embodiment of the present invention, which has embodied the outstanding substantial features and significant progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications can be made to its shape, structure, etc., which are all within the protection scope of this scheme.

Claims

1. A hybrid-cooled axial-flux permanent magnet motor, comprising a stator and an outer rotor, characterized in that: The outer rotor includes a left magnet mounting plate (1), a right magnet mounting plate (2), and a rotor housing (3) located between the outer circumferences of the left magnet mounting plate (1) and the right magnet mounting plate (2). The inner sides of the left magnet mounting plate (1) and the right magnet mounting plate (2) are evenly distributed with magnets (4) in a circumferential manner. The stator is located inside the rotor. The stator includes a stator core (5), core brackets (6) provided on both axial sides of the stator core (5), and a stator winding (7) provided on the stator core (5). The stator core (5) is connected and fixed to a stator core support shaft (8) through the core brackets (6). The left magnet mounting plate (1) and the right magnet mounting plate (2) are rotatably connected to both ends of the stator core support shaft (8) on the outer sides of the two core brackets (6) axially. There is an operating gap between the stator and the outer rotor. The left magnet mounting plate (1) and the right magnet mounting plate (2) are provided with evenly distributed axial air inlet holes (101) in a circumferential manner. The rotor housing (3) is provided with evenly distributed radial air outlet holes (301) in a circumferential manner. The core brackets (6) are provided with liquid cooling channels (601) for cooling the stator core (5); The core brackets (6) include an annular bracket fixing part (602) and bracket ribs (603) evenly distributed on the outside of the bracket fixing part (602). The liquid cooling channels (601) are provided on each bracket rib (603) and are connected in series. The inner hole of the bracket fixing part (602) matches the bracket fixing groove (801) of the stator core support shaft (8). The bracket fixing part (602) is connected and fixed to the bracket fixing disc (802) of the stator core support shaft (8) through bolts; Each core unit of the stator core (5) has a dovetail structure on both sides of the winding. A bracket groove is formed between the dovetail structures of two adjacent core units. The bracket groove matches the shape and size of the bracket ribs (603). Core pressing blocks (10) are provided on the outside of the bracket ribs (603) and the stator core (5). The core pressing blocks (10) are connected and fixed to the outer ends of the bracket ribs (603) through screws.

2. A hybrid-cooled axial-flux permanent magnet motor according to claim 1, characterized in that: The stator core support shaft (8) is a hollow shaft, and the stator core support shaft (8) is provided with stator winding inlets and outlets (804) and liquid cooling channel inlets and outlets (803).

3. A hybrid-cooled axial-flux permanent magnet motor according to claim 1, characterized in that: The stator core (5) is formed by laminating silicon steel sheets or is formed by pressing iron powder.

4. A hybrid-cooled axial-flux permanent magnet motor according to claim 1, characterized in that: The inner sides of the left magnet mounting plate (1) and the right magnet mounting plate (2) are rotatably connected to the stator core support shaft (8) through bearings.

5. A hybrid-cooled axial-flux permanent magnet motor according to claim 1, characterized in that: The magnetic steel (4) is pressed by a magnetic steel pressing block (9) and fixed by screw connection.

6. A hybrid cooling axial flux permanent magnet motor according to claim 5, Features: The radial inner and outer side surfaces of the magnetic steel (4) are provided with an inclination, and the magnetic steel pressing block (9) matches the inclination.

7. A hybrid cooling axial flux permanent magnet motor according to claim 6, Features: Each magnetic steel (4) is formed by splicing together a plurality of small magnetic steel (4) blocks by bonding with insulating glue.

8. A hybrid cooling axial flux permanent magnet motor according to claim 1, Features: The two ends of the rotor shell (3) are positioned and connected to the magnetic steel (4) mounting plates on both sides through stoppers and are fixed by screws.

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