Stator assembly and motor

Abstract

The present application provides a stator assembly and a motor. The stator assembly includes a stator core (1) and a flow guiding plate (2). The flow guiding plate (2) is hermetically attached to the first end of the stator core (1). A flow guiding channel is provided on the side of the flow guiding plate (2) facing the stator core (1). The flow guiding channel includes an air inlet for connecting to an air source, and the air outlet of the flow guiding channel communicates with the rotor mounting hole (3) of the stator core (1). According to the stator assembly of the present application, air suspension control of the motor can be achieved without damaging the stator structure, improving the structural stability of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of motor equipment, and particularly relates to a stator assembly and a motor. Background Art

[0002] High-speed motors have advantages such as high power density, high efficiency, and high dynamic response, and are widely used in many fields. Due to large frictional losses, mechanical vibrations, and noise problems when using ball bearings for support, a small number of motors use magnetic levitation bearings or adopt bearingless motors, which can effectively avoid frictional losses and mechanical noise; Motors with five-degree-of-freedom magnetic levitation bearings are generally relatively long, have more bearing components, and have a more complex mechanical structure; In a bearingless motor stator, both drive windings and control windings are embedded at the same time, and decoupling needs to be achieved to operate, which requires complex control algorithms to achieve.

[0003] To solve the problems of complex structure, complex control, and poor heat dissipation of high-speed motors, the patent with the publication number CN107786025A discloses a gas-bearing rotor bearingless rotating motor. By opening holes in the stator teeth and introducing compressed gas, the rotor of the motor can be levitated; To achieve stable levitation, it is necessary to open dense through-holes in the stator, which will damage the structural strength and magnetic circuit of the stator, especially in motors with a distributed winding form. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a stator assembly and a motor that can achieve gas levitation control of the motor without damaging the stator structure and improve the structural stability of the motor.

[0005] To solve the above problems, the present application provides a stator assembly, including a stator core and a flow guide plate. The flow guide plate is hermetically attached to the first end of the stator core. On the side of the flow guide plate facing the stator core, there is a flow guide channel. The flow guide channel includes an air inlet for connecting to a gas source, and the air outlet of the flow guide channel communicates with the rotor mounting hole of the stator core.

[0006] Preferably, the flow guide channel further includes a pressure equalizing groove, which is located between the air inlet and the air outlet and extends along the circumferential direction of the stator core.

[0007] Preferably, the flow guide channel further includes a plurality of flow guide grooves. The plurality of flow guide grooves are arranged along the circumferential direction of the stator core, and each flow guide groove extends along the radial direction of the stator core. The pressure equalizing groove communicates with the air outlet through the flow guide grooves.

[0008] Preferably, the stator core includes stator teeth, and the flow guide grooves extend from the pressure equalizing groove to the stator teeth and extend along the radial direction of the stator teeth.

[0009] Preferably, a stator winding is disposed inside the stator teeth. The flow guiding channel further includes an air outlet pipe. One end of the air outlet pipe communicates with the flow guiding groove, the other end of the air outlet pipe is located radially inside the stator winding, and the pipe orifice of the air outlet pipe forms an air outlet.

[0010] Preferably, the air outlet pipe is L-shaped, and the pipe orifice of the air outlet pipe faces the side where the stator core is located.

[0011] Preferably, a stator slot wedge is further disposed inside the stator teeth. The stator slot wedge is located radially inside the stator winding. The air outlet pipe is located inside the stator tooth slot and on the inner circumferential side of the stator slot wedge.

[0012] Preferably, a shunt flow channel is further disposed between the pressure equalizing groove and the flow guiding groove. The shunt flow channel extends along the circumferential direction of the stator core. The flow guiding grooves are all connected to the shunt flow channel, and the pressure equalizing groove is communicated with the shunt flow channel.

[0013] Preferably, the flow guiding plate is fan-shaped annular, and a plurality of flow guiding plates are spliced into a disc structure.

[0014] Preferably, auxiliary tooth grooves are further disposed on the flow guiding plate. The shape of the auxiliary tooth grooves is adapted to the shape of the stator tooth grooves of the stator core.

[0015] Preferably, a flow guiding ring is disposed on the pore wall of the rotor mounting hole of the stator core. Flow equalizing holes are disposed on the flow guiding ring, and the air outlet of the flow guiding channel is communicated with the flow equalizing holes.

[0016] Preferably, the flow equalizing holes are honeycomb-shaped openings, and the openings of the honeycomb-shaped openings face radially inside the stator core.

[0017] According to another aspect of the present application, a motor is provided, including a stator assembly and a rotor assembly. The stator assembly is the above-mentioned stator assembly, and the rotor assembly is disposed inside the rotor mounting hole of the stator assembly.

[0018] The stator assembly provided by the present application includes a stator core and a flow guiding plate. The flow guiding plate is hermetically attached to the first end of the stator core. A flow guiding channel is disposed on the side of the flow guiding plate facing the stator core. The flow guiding channel includes an air inlet for connecting with a gas source, and the air outlet of the flow guiding channel is communicated with the rotor mounting hole of the stator core. An additional flow guiding plate is added to the stator core of this stator assembly, and the flow guiding channel for guiding gas is disposed on this flow guiding plate. Therefore, when ventilating, the air flow can enter the inner circumferential side of the stator core through the flow guiding channel, providing an upward acting force for the rotor assembly. Since the flow guiding channel is opened on the flow guiding plate, the stator structure does not need to be damaged. Designing the flow guiding channel on the flow guiding plate can make the design of the air supply pipeline on the stator assembly simpler, reduce the processing amount, reduce the processing cost, and improve the processing efficiency, so as to realize the air suspension control of the motor without damaging the stator structure and improve the structural stability of the motor. Description of the Drawings

[0019] Figure 1 Structural schematic diagram of the stator assembly according to an embodiment of the present application;

[0020] Figure 2 Side view structural schematic diagram of the stator assembly according to an embodiment of the present application;

[0021] Figure 3 Cross-sectional view structural schematic diagram of the stator assembly according to an embodiment of the present application;

[0022] Figure 4 Structural schematic diagram of the flow guide plate of the stator assembly according to an embodiment of the present application;

[0023] Figure 5 Rear view structural schematic diagram of the flow guide plate of the stator assembly according to an embodiment of the present application;

[0024] Figure 6 Partial enlarged structural schematic diagram of the stator assembly according to an embodiment of the present application.

[0025] The reference signs are shown as:

[0026] 1, stator core; 2, flow guide plate; 3, rotor mounting hole; 4, equalizing groove; 5, flow guide groove; 6, stator tooth; 7, stator tooth slot; 8, stator winding; 9, air outlet pipe; 10, stator slot wedge; 11, shunt flow channel; 12, auxiliary tooth slot; 13, flow guide ring; 14, rotor assembly. Detailed implementation manners

[0027] With reference to Figures 1 to 6 As shown, according to an embodiment of the present application, the stator assembly includes a stator core 1 and a flow guide plate 2. The flow guide plate 2 is hermetically attached to the first end of the stator core 1. A flow guide channel is provided on the side of the flow guide plate 2 facing the stator core 1. The flow guide channel includes an air inlet for connecting to an air source, and the air outlet of the flow guide channel communicates with the rotor mounting hole 3 of the stator core 1.

[0028] The stator assembly additionally adds a flow guide plate 2 to the stator core 1, and arranges the flow guide channel for guiding gas originally provided on the stator core on the flow guide plate 2. Therefore, when ventilating, the air flow can enter the inner circumferential side of the stator core 1 through the flow guide channel, providing an upward gas suspension force for the rotor assembly. Since the flow guide channel is opened on the flow guide plate 2, the stator structure does not need to be damaged. Designing the flow guide channel on the flow guide plate 2 can make the gas supply pipeline design on the stator assembly simpler, reduce the processing amount, reduce the processing cost, and improve the processing efficiency, thereby realizing the air suspension control of the motor without damaging the stator structure and improving the structural stability of the motor.

[0029] The flow guiding channel further includes a pressure equalizing groove 4 which is located between the air inlet and the air outlet and extends along the circumferential direction of the stator core 1. By providing the circumferentially arranged pressure equalizing groove 4, the air inlet at a certain point on the flow guiding plate 2 can be equalized in pressure through the pressure equalizing groove 4, and at the same time, the air flow can be distributed along the circumferential direction of the flow guiding plate 2 through the pressure equalizing groove, so as to expand the flow guiding area of a single air inlet, enabling there to be only one air inlet corresponding to multiple air outlets. The circumferentially extending pressure equalizing groove 4 is used to realize the connection between a single air inlet and multiple air outlets, which can achieve a one-to-many air inlet and outlet structure, reducing the number of air inlets, and at the same time making the pressure distribution entering each air outlet more uniform, capable of forming a uniform air film between the stator assembly and the rotor assembly 14, making the suspension structure of the rotor assembly 14 more stable.

[0030] Preferably, an air inlet pipe is further provided at the air inlet. The air inlet can extend along the radial direction of the stator core 1 and then communicate with the pressure equalizing groove 4. At this time, the air inlet is arranged on the outer peripheral side of the flow guiding plate 2, and the air inlet pipe is arranged along the radial direction at the air inlet, which is convenient for realizing the connection between the air inlet and the air source.

[0031] Without causing interference to the installation of other components, the air inlet can also extend along the axial direction of the stator core 1 and communicate with the pressure equalizing groove 4. At this time, the air inlet is arranged on the side of the flow guiding plate 2 away from the stator core 1, and the air inlet pipe is arranged along the axial direction at the air inlet.

[0032] In this embodiment, the flow guiding channel further includes a plurality of flow guiding grooves 5 which are arranged along the circumferential direction of the stator core 1, and each flow guiding groove 5 extends along the radial direction of the stator core 1. The pressure equalizing groove 4 is communicated with the air outlet through the flow guiding grooves 5. The plurality of flow guiding grooves are evenly distributed along the circumferential direction of the stator core 1, so as to be able to uniformly introduce gas on the circumferential side of the rotor assembly 14, and then form a uniform air film between the rotor assembly 14 and the stator assembly.

[0033] The stator core 1 includes stator teeth 6. The flow guiding grooves 5 extend from the pressure equalizing groove 4 to the stator teeth 6 and extend along the radial direction of the stator teeth 6. By arranging the flow guiding grooves 5 on the stator teeth 6, the characteristic that the stator teeth 6 extend to the inner peripheral side of the stator core 1 can be utilized to increase the gas transmission distance, so that the gas can quickly reach the inner peripheral side of the stator core 1 after flowing out from the stator teeth 6, and then enter the air gap between the stator assembly and the rotor assembly 14 to form an air film.

[0034] Preferably, the flow guiding grooves 5 can penetrate the stator teeth 6 along the radial direction. In this way, after the air flow enters the flow guiding grooves 5, it can directly enter the air gap along the radial direction of the stator core 1 through the flow guiding grooves 5, realizing direct air supply to the air gap, simplifying the air supply structure of the flow guiding plate 2 and reducing the structural difficulty.

[0035] In addition, as the gas flows through the coil wound around the stator tooth 6 during the process of entering the air gap, it can cool the stator winding 8 and reduce the heat generation of the stator assembly.

[0036] In this embodiment, a stator winding 8 is arranged inside the stator tooth 6. The diversion channel further includes an air outlet pipe 9. One end of the air outlet pipe 9 is communicated with the diversion groove 5, the other end of the air outlet pipe 9 is located radially inside the stator winding 8, and the pipe orifice of the air outlet pipe 9 forms an air outlet.

[0037] In this embodiment, the diversion groove 5 extends to the radially inner circumferential side of the stator tooth 6, but does not penetrate the stator tooth 6 radially. Instead, it forms a closure at the end of the radially inner circumferential side of the stator tooth, and an air outlet pipe 9 for guiding the air flow inside the diversion plate 2 is arranged on the diversion plate 2, so as to guide the air flow entering the diversion groove 5, so that the air flow can enter the radially inner side of the stator winding 8 through the air outlet pipe 9, and quickly flow axially along the stator tooth groove 7, and then enter the air gap from the entire axial direction of the stator core 1, so that a uniform air film is formed between the rotor assembly 14 and the stator assembly in the entire axial and circumferential directions, further improving the gas suspension effect of the rotor assembly 14 in the stator assembly.

[0038] In this embodiment, the air outlet pipe 9 is L-shaped, and the pipe orifice of the air outlet pipe 9 faces the side where the stator core 1 is located. Setting the air outlet pipe 9 as L-shaped can change the diversion direction of the air flow in the diversion groove 5 by the air outlet pipe 9, so that the gas discharged from the air outlet pipe 9 can flow along the entire axial direction of the stator tooth groove 7 and be quickly distributed to the entire axial direction of the stator tooth groove 7, which is more convenient for accelerating the flow distribution of the air flow, so that the air film is evenly distributed between the rotor assembly 14 and the stator assembly, ensuring more stable suspension of the rotor assembly 14.

[0039] Preferably, a stator slot wedge 10 is further arranged inside the stator tooth 6. The stator slot wedge 10 is located radially inside the stator winding 8. The air outlet pipe 9 is located inside the stator tooth groove 7 and on the inner circumferential side of the stator slot wedge 10. By arranging the stator slot wedge 10, on the one hand, it can limit the stator winding 8 to prevent the stator winding 8 from slipping out of the stator tooth 6, ensuring the stability and reliability of the overall structure of the stator winding 8. On the other hand, it can form a flow resistance effect on the gas flowing out of the air outlet pipe 9 to prevent this part of the air flow from entering the stator winding 8, so that the air flow can flow more concentratedly into the air gap between the rotor assembly 14 and the stator assembly, forming a more effective gas suspension support for the rotor assembly 14.

[0040] A shunt flow channel 11 is further arranged between the equalizing groove 4 and the diversion groove 5. The shunt flow channel 11 extends along the circumferential direction of the stator core 1. The diversion grooves 5 are all connected to the shunt flow channel 11, and the equalizing groove 4 is communicated with the shunt flow channel 11.

[0041] The shunt flow channel 11 extends along the circumferential direction of the stator core 1, and can shunt the gas flowing out of the pressure equalizing groove 4, so that the air flow can be more evenly distributed into each diversion groove 5, and then a uniform distribution can be formed in the air gap.

[0042] The guide vane 2 is in a fan-shaped ring shape, and a plurality of guide vanes 2 are spliced into a disc structure. By dividing the guide vane 2 into a plurality of fan-shaped rings, the processing difficulty of each guide vane 2 can be reduced, and the sealing performance between the guide vane 2 and the stator core 1 can be improved. In this embodiment, an air inlet needs to be provided on each guide vane 2, and through this air inlet, the air supply of a plurality of diversion grooves 5 on the guide vane 2 can be realized.

[0043] The guide vane 2 can also be an integral plate-shaped structure in a circular ring shape. In this structure, the pressure equalizing groove 4 and the shunt flow channel 11 are both circular rings. At this time, through the pressure equalizing effect of the pressure equalizing groove 4 and the shunt effect of the shunt flow channel 11, only one air inlet is required to realize the gas transportation function of a plurality of diversion grooves 5, so that the gas can enter each stator tooth groove 7 evenly, simplify the stator end air supply pipeline, and at the same time avoid damaging the stator structure and reduce the processing cost. Of course, in order to increase the air intake and ensure the stability of the uniform air film, a plurality of air inlets can be evenly arranged along the circumferential direction of the guide vane 2 to supply air to the diversion grooves 5 at the same time.

[0044] Preferably, auxiliary tooth grooves 12 are also provided on the guide vane 2, and the shape of the auxiliary tooth grooves 12 is adapted to the shape of the stator tooth grooves 7 of the stator core 1. The stator winding 8 is wound in the tooth grooves jointly formed by the auxiliary tooth grooves 12 and the stator tooth grooves 7, which can further ensure the sealing performance between the end face of the guide vane 2 and the stator core 1.

[0045] A guide ring 13 is provided on the pore wall of the rotor mounting hole 3 of the stator core 1, and flow equalizing holes are provided on the guide ring 13, and the air outlet of the diversion channel is communicated with the flow equalizing holes.

[0046] In this embodiment, the guide ring 13 is a thin-walled circular ring structure, and its outer diameter is equal to the inner diameter of the stator core 1. A plurality of channels are opened on the guide ring 13 for realizing the flow of gas, so as to ensure that the air flow at the air outlet pipe 9 can smoothly enter the air gap through the guide ring 13. A gap is formed between the guide ring 13 and the stator slot wedge 10, and the air outlet of the air outlet pipe 9 is arranged in this gap, which can effectively prevent the air outlet pipe 9 from interfering with the guide ring 13, the stator winding 8 or the stator slot wedge 10. At the same time, the air flow can be distributed in the air gap area corresponding to the stator tooth grooves 7 and the air gap area corresponding to the stator teeth 6 through the guide ring 13, further improving the uniformity of the air film distribution.

[0047] Preferably, the flow equalizing holes are honeycomb-shaped openings, and the openings of the honeycomb-shaped openings face the radially inner side of the stator core 1, which can enable the gas to enter the rotor mounting hole 3 evenly, form a uniform gas film, and make the suspension of the rotor assembly 14 more stable.

[0048] When assembling the stator assembly, first, insert the wires into the stator core 1, dip the stator winding 8 in paint, bake and cure it, so that the stator winding 8 will not become loose during operation, and the paint cured in the stator tooth grooves 7 will also firmly fix the stator slot wedges 10 in the slots. Then, fill the gaps on both sides of the stator tooth grooves 7 with heat dissipation silicone; then place the guide ring 13 into the rotor mounting hole 3. Since the stator slot wedges 10 cannot completely fill the stator slot openings, a gap is formed between the outer surface of the guide ring 13 and the stator tooth grooves 7, which provides conditions for the flow of gas.

[0049] Next, place the deflector 2 at the end of the stator core 1, and fix it by gluing at the end or by riveting. Place the air outlet of the deflector 2 into the gap between the guide ring 13 and the stator tooth grooves 7, and seal the end with glue to ensure that there is no leakage when the gas flows.

[0050] Finally, connect high-pressure gas at the inlet of the deflector 2. The gas passes through the deflector 2, the gaps in the stator tooth grooves 7, and the guide ring 13, and then enters the air gap in the inner cavity of the stator assembly. The high air pressure acts on the outer surface of the rotor assembly 14, and the rotor assembly 14 receives an upward suspension force and floats away from the inner surface of the stator core 1, reducing the frictional loss on the rotor bearings during operation.

[0051] According to an embodiment of the present application, the motor includes a stator assembly and a rotor assembly 14. The stator assembly is the above-mentioned stator assembly, and the rotor assembly 14 is arranged in the rotor mounting hole 3 of the stator assembly.

[0052] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0053] The above is only a preferred embodiment of the present application, and it is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present application.

Claims

1. A stator assembly, characterized in that, It includes a stator core (1) and a flow guide plate (2). The flow guide plate (2) is hermetically attached to the first end of the stator core (1). On the side of the flow guide plate (2) facing the stator core (1), a flow guide channel is provided. The flow guide channel includes an air inlet for connecting to an air source, and the air outlet of the flow guide channel communicates with the rotor mounting hole (3) of the stator core (1); the flow guide channel further includes a pressure equalizing groove (4), and the pressure equalizing groove (4) is located between the air inlet and the air outlet and extends along the circumferential direction of the stator core (1). The flow guide channel further includes a plurality of flow guide grooves (5). The plurality of flow guide grooves (5) are arranged along the circumferential direction of the stator core (1), and each flow guide groove (5) extends along the radial direction of the stator core (1). The pressure equalizing groove (4) communicates with the air outlet through the flow guide grooves (5).

2. The stator assembly according to claim 1, characterized in that, The stator core (1) includes stator teeth (6). The flow guide grooves (5) extend from the pressure equalizing groove (4) to the stator teeth (6) and extend along the radial direction of the stator teeth (6).

3. The stator assembly according to claim 2, characterized in that, A stator winding (8) is arranged in the stator teeth (6). The flow guide channel further includes an air outlet pipe (9). One end of the air outlet pipe (9) communicates with the flow guide groove (5), and the other end of the air outlet pipe (9) is located radially inside the stator winding (8). The orifice of the air outlet pipe (9) forms the air outlet.

4. The stator assembly according to claim 3, characterized in that, The air outlet pipe (9) is L-shaped, and the orifice of the air outlet pipe (9) faces the side where the stator core (1) is located.

5. The stator assembly according to claim 3, characterized in that, A stator slot wedge (10) is further arranged in the stator teeth (6). The stator slot wedge (10) is located radially inside the stator winding (8). The air outlet pipe (9) is located in the stator tooth slot (7) and on the inner circumferential side of the stator slot wedge (10).

6. The stator assembly according to claim 1, characterized in that, A flow dividing channel (11) is further arranged between the pressure equalizing groove (4) and the flow guide grooves (5). The flow dividing channel (11) extends along the circumferential direction of the stator core (1). The flow guide grooves (5) are all connected to the flow dividing channel (11), and the pressure equalizing groove (4) communicates with the flow dividing channel (11).

7. The stator assembly according to any one of claims 1 to 6, characterized in that, The flow guide plate (2) is fan-shaped ring-shaped, and a plurality of the flow guide plates (2) are spliced into a disc structure.

8. The stator assembly according to any one of claims 1 to 6, characterized in that, Auxiliary tooth grooves (12) are further arranged on the flow guide plate (2). The shape of the auxiliary tooth grooves (12) is adapted to the shape of the stator tooth grooves (7) of the stator core (1).

9. The stator assembly according to any one of claims 1 to 6, characterized in that, A flow guide ring (13) is arranged on the pore wall of the rotor mounting hole (3) of the stator core (1). Uniform flow holes are arranged on the flow guide ring (13), and the air outlet of the flow guide channel communicates with the uniform flow holes.

10. The stator assembly according to claim 9, characterized in that, The uniform flow holes are honeycomb-shaped openings, and the openings of the honeycomb-shaped openings face radially inside the stator core (1).

11. An electric motor, comprising a stator assembly and a rotor assembly (14), characterized in that, The stator assembly is the stator assembly according to any one of claims 1 to 10, and a rotor assembly (14) is arranged in the rotor mounting hole (3) of the stator assembly.

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