Motor stator structure and motor

Abstract

This invention discloses a motor stator structure, including a stator body, a stator tie plate disposed radially outside the stator body, and two pressure rings respectively disposed at both ends of the stator tie plate. A stator cooling channel is formed at at least one of the stator tie plates. At least one pressure ring has a notch that mates with the stator cooling channel, allowing communication with an inlet / outlet channel. The stator cooling channel formed at the stator tie plate can cool the structure at that location. Providing a stator cooling channel at the stator tie plate does not alter the stator structure, making stator manufacturing simpler and more convenient. Furthermore, the stator cooling channel design is simpler and more convenient. Therefore, this motor stator structure effectively solves the problem of poor stator heat dissipation in conventional methods. This invention also discloses a motor including the above-described motor stator structure.

Description

Technical Field

[0001] This invention relates to the field of electric equipment, and more specifically, to a motor stator structure, and to a motor including the above-described motor stator structure. Background Technology

[0002] Currently, the common cooling structure for traction motors with cooling fans involves ventilation holes on the stator or rotor, combined with air gap ventilation between the stator and rotor. In the first scenario, the stator can operate normally without ventilation holes. With the additional cooling air, the stator body temperature will certainly be lower, resulting in a larger design redundancy. Through optimization, the stator outer diameter can be made smaller, reducing the motor's size and space footprint. In the second scenario, ventilation holes are provided on the stator body. While this cools the stator, the ventilation holes occupy a portion of the volume. The magnetic conductivity of the air in these ventilation holes is negligible compared to the core material. Therefore, with the same maximum magnetic flux, adding ventilation holes will inevitably increase the stator body outer diameter, thus increasing the motor's size. Therefore, directly adding ventilation holes to the stator laminations for stator heat dissipation is not a good approach.

[0003] CN113381562A discloses an external frame-type heat dissipation system. Ventilation slots are provided on the motor frame. Under the action of a cooling fan, cooling air passes through the ventilation slots and heat dissipation fins of the frame, carrying away heat from the stator. While this structure can reduce the heat of the stator, the outer frame occupies a certain volume, and the frame housing cannot be too thin because the frame needs to constrain the stacked stator body and support the entire motor. This inevitably increases the weight of the entire motor significantly, which is not conducive to lightweight design. Therefore, ventilation slots are provided on the frame to dissipate heat from the stator. However, this design method is not ideal.

[0004] In conclusion, how to effectively solve the problem of poor stator heat dissipation design is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention

[0005] In view of this, the first objective of the present invention is to provide a motor stator structure that can effectively solve the problem of poor stator heat dissipation. The second objective of the present invention is to provide a motor including the above-mentioned motor stator structure.

[0006] To achieve the first objective mentioned above, the present invention provides the following technical solution:

[0007] A motor stator structure includes a stator body, a stator pull plate disposed radially outside the stator body, and two pressure rings respectively disposed at both ends of the stator pull plate. A stator cooling channel is formed at at least one of the stator pull plates or multiple stator pull plates. At least one of the pressure rings is provided with a notch that mates with the stator cooling channel so as to communicate with the inlet / outlet channel through the notch.

[0008] In the aforementioned motor stator structure, a stator cooling channel is formed at the stator pull plate, and a notch is provided on the pressure ring to connect with the stator cooling channel, thus linking it to the inlet and outlet channels. This allows for the continuous or intermittent introduction of cooling fluid into the stator cooling channel, absorbing heat and cooling the structure within the channel. Because the stator pull plate is positioned close to the radial periphery of the stator, it can absorb heat from the stator's outer surface, further cooling the stator. Furthermore, the stator cooling channel at the pull plate eliminates the need for additional ventilation holes inside the stator laminations, preventing a reduction in stator torque caused by such holes. It also avoids the need for a large housing, resulting in a more compact overall structure, effectively reducing the motor's size and weight. Moreover, it allows for manufacturing the stator body without altering its main structure, simplifying manufacturing. As the pull plate is a pulling component, its structural requirements are minimal, making the installation of the stator cooling channel simpler and more convenient. Therefore, a stator cooling channel is set on the stator pull plate to dissipate heat from the stator. This stator heat dissipation method is more effective. In summary, the stator structure of this motor can effectively solve the problem of poor stator heat dissipation.

[0009] Preferably, the inner side of the stator pull plate has a groove structure, and the groove structure and the stator body are combined to form the stator cooling channel.

[0010] Preferably, the stator tie plate has an arc-shaped cross-section.

[0011] Preferably, the pressure rings at both ends of the two stator pull plates each have the notch to connect with the channel openings at both ends of the stator cooling channel, respectively.

[0012] Preferably, the distance between the radial edges of the notch is not less than the distance between the radial walls of the stator cooling channel.

[0013] Preferably, the two ends of the stator pull plate are welded and fixed to the pressure rings at both ends, and the pressure rings at both ends abut against the two ends of the stator body.

[0014] Preferably, a plurality of stator pull plates are evenly arranged along the circumferential direction of the stator body, and each stator pull plate is provided with a stator cooling channel.

[0015] Preferably, along the circumferential direction of the stator body, the sum of the central angles corresponding to the circumferential widths of all the stator cooling channels is not less than 120 degrees.

[0016] Preferably, the stator pull plate has at least one through hole extending to one end, and the inner cavity of the hole serves as the stator cooling channel.

[0017] To achieve the second objective mentioned above, the present invention also provides an electric motor, which includes any of the aforementioned motor stator structures and a rotor structure, wherein an air gap cooling channel is formed between the rotor structure and the motor stator structure, and the rotor structure is provided with a rotor cooling channel. Since the aforementioned motor stator structure has the above-mentioned technical effects, the motor having this motor stator structure should also have the corresponding technical effects. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the axial cross-sectional structure of the motor provided in an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the radial cross-sectional structure of a motor provided in an embodiment of the present invention;

[0021] Figure 3 This is a side view of the stator tie plate provided in an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of the outer structure of the stator tie plate provided in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the pressure ring provided in an embodiment of the present invention.

[0024] The following labels are shown in the attached diagram:

[0025] 1. Stator body, 2. Stator tie plate, 3. Pressure ring, 4. Rotor structure, 5. End cover, 6. Stator cooling channel, 7. Notch, 8. Air gap cooling channel, 9. Rotor cooling channel, 21. Slot structure. Detailed Implementation

[0026] This invention discloses a motor stator structure that can effectively solve the problem of poor stator heat dissipation.

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-5 , Figure 1 A schematic diagram of the axial cross-sectional structure of the motor provided in an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the radial cross-sectional structure of a motor provided in an embodiment of the present invention; Figure 3 This is a side view of the stator tie plate provided in an embodiment of the present invention; Figure 4 A schematic diagram of the outer structure of the stator tie plate provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the pressure ring provided in an embodiment of the present invention.

[0030] In some specific embodiments, as shown in the appendix Figure 3 As shown, a motor stator structure is provided for use with the motor rotor structure 4. The motor stator structure mainly includes: a stator body 1, a stator tie plate 2, and a pressure ring 3. It can be a stator structure for a casingless traction motor.

[0031] The stator body 1 can be a stator core or a stator core with a winding assembly. The outer side of the stator body 1 is generally composed of stator blades, which can be stator laminations, surrounding the outside of the rotor structure 4. The specific structure of the stator body 1 can be found in existing technology and will not be described in detail here. In some embodiments, the outer side of the stator body 1 can be a smooth arc surface or other structures.

[0032] The stator pull plate 2 is located radially outside the stator body 1, and two pressure rings 3 are respectively located at both ends of the stator pull plate 2. The two ends of the stator pull plate 2 are fixedly connected to the pressure rings 3 at both ends, such as by welding and / or screw connection, or other connection methods can also be adopted. The two ends of the stator body 1 abut against the pressure rings 3 at both ends to withstand the compressive force from the pressure rings 3 and thus maintain their current position. The function of the stator pull plate 2 is to limit the relative distance between the pressure rings 3 at both ends to ensure that the pressure rings 3 at both ends exert compressive force on the stator pull plate 2 inside.

[0033] A stator cooling channel 6 is formed at at least one of the stator pull plates 2 or more. It should be noted that the motor stator structure may have only one stator pull plate 2, such as a cylindrical, semi-circular, or flat plate. When there is only one stator pull plate 2, then the stator pull plate 2 will be provided with a stator cooling channel 6. When the motor stator structure has multiple stator pull plates 2, the multiple stator pull plates 2 are generally arranged sequentially along the circumference of the stator body 1. Then, among these multiple stator pull plates 2, at least one stator pull plate 2 can be provided with the stator cooling channel 6. Of course, each stator pull plate 2 can also be provided with the stator cooling channel 6.

[0034] It should be noted that the stator cooling channel 6 is formed at the stator pull plate 2 in the following ways: for example, a groove structure can be formed on the outer or inner side of the stator pull plate 2, and the groove cavity of the groove structure serves as the stator cooling channel 6; or the stator pull plate 2 can be provided with a hole along the stator axis. The hole can be a through hole that extends along the stator axis or a blind hole that extends along the stator axis, and the cavity of the hole serves as the stator cooling channel 6.

[0035] Specifically, the stator cooling channel 6 can be a stator cooling air duct, through which cooling air flows to cool the channel walls. Alternatively, the stator cooling channel 6 can also be used to flow other cooling fluids, which can be a liquid that meets the usage requirements.

[0036] Correspondingly, at least one pressure ring 3 is provided with a notch 7 that mates with the stator cooling channel 6, so as to communicate with the inlet and outlet channels through the notch 7, so as to realize the communication between the stator cooling channel 6 and the inlet and outlet channels through the notch 7 on the pressure ring 3.

[0037] It should be noted that the inlet and outlet channels, such as inlet and outlet air chambers, are used for the entry and exit of cooling fluid. These inlet and outlet channels can be: a single channel, allowing cooling fluid to be introduced and exited in stages during use; or two separate channels, namely, a separate inlet channel and an outlet channel. Correspondingly, two notches 7 can be provided on a pressure ring 3 to correspond to the inlet and outlet channels respectively, or the notches 7 on both ends of the pressure ring 3 can connect to the inlet and outlet channels respectively. Generally, the cavity between the pressure ring 3 and the end cap 5 on the corresponding side serves as the inlet and outlet channel, such as the inlet and outlet air chamber.

[0038] Of course, the method of connecting the stator cooling channel 6 with the inlet and outlet channels through the notch 7 to allow the cooling fluid to be introduced and discharged is not limited to the above method; other methods can also be used.

[0039] In the aforementioned motor stator structure, a stator cooling channel 6 is formed at the stator pull plate 2, and a notch 7 is provided on the pressure ring 3 to connect with the stator cooling channel 6, thus connecting to the inlet and outlet channels. This allows for the continuous or intermittent introduction of cooling fluid into the stator cooling channel 6, enabling heat absorption and cooling of the stator cooling channel 6 structure. Furthermore, because the stator pull plate 2 is located close to the radial periphery of the stator body 1, it can absorb heat and cool the stator periphery, thereby achieving the effect of cooling the stator body 1. Moreover, setting the stator cooling channel 6 at the stator pull plate 2 does not alter the stator structure, making stator manufacturing simpler and more convenient. Additionally, as a pulling component, the stator pull plate 2 does not require extensive structural design, making the setting of the stator cooling channel 6 simpler and more convenient. In summary, this motor stator structure effectively solves the problem of poor stator heat dissipation in conventional methods.

[0040] In some embodiments, the stator pull plate 2 has a groove structure 21 on its inner side, and the groove structure and the stator body 1 are combined to form a stator cooling channel 6. This allows some of the cooling fluid in the stator cooling channel 6 to directly contact the stator body 1, so that heat absorption at the stator body 1 can be more efficient. Moreover, the groove structure 21 on the stator pull plate 2 can serve as a major component of the stator cooling channel 6, which can avoid or reduce the problem of slotting on the stator body 1.

[0041] In some embodiments, to allow the cooling fluid in the slot cavity to contact the stator body 1 over a larger area, the slot cavity structure is preferably flattened, meaning the slot depth is less than the slot width, and preferably the slot depth is significantly less than the slot width. This allows for a larger span in the circumferential direction of the stator body 1, enabling more efficient cooling of the stator body 1. Specifically, this can be achieved by controlling the central angle corresponding to the circumferential width of the stator cooling channel 6. The central angle corresponding to the circumferential width of the stator cooling channel 6 is the angle between the two circumferential boundaries of the stator cooling channel 6 and the rotor axis. Arc segments with the same angle on the stator body 1 serve as the inner channel walls of the stator cooling channel 6. A larger angle means that more of the outer circumferential direction of the stator body can directly contact the cooling fluid in the stator cooling channel 6. Specifically, along the circumferential direction of the stator body 1, the sum of the central angles corresponding to the circumferential widths of all the stator cooling channels 6 should not be less than 120 degrees, so as to better ensure the area of ​​the stator body 1 in direct contact with the cooling fluid. Correspondingly, the radial width and circumferential width of the stator pull plate 2 can be comprehensively considered based on the actual cooling air volume required by the motor and the number of stator pull plates 2.

[0042] In some embodiments, the stator pull plate 2 has the above-mentioned groove structure 21 on its inner side, which can not only serve as a stator cooling channel 6, but also enable the stator pull plate 2 to have the effects of enhanced torsional resistance and weight reduction.

[0043] In some embodiments, for ease of installation, the stator tie plate 2 may have an arc-shaped cross-section. That is, it bends towards the stator body 1 on both sides in the circumferential direction to form a cavity structure. Specifically, the stator tie plate 2 may include a flat plate portion located in the middle of the circumferential direction and two curved plate portions on both sides of the flat plate portion, which are connected to form an arc-shaped structure.

[0044] In some embodiments, both ends of the pressure ring 3 may be provided with notches 7. The notch 7 of the pressure ring 3 at the inlet end is connected to the inlet channel, and the notch 7 of the pressure ring 3 at the outlet end is connected to the outlet channel, so that the inlet channel enters the stator cooling channel 6 through the notch 7 of the inlet pressure ring 3, and then absorbs heat from the stator cooling channel 6 and flows out to the outlet channel through the notch 7 of the outlet pressure ring 3.

[0045] In some embodiments, to facilitate smoother fluid flow between the notch 7 and the stator cooling channel 6, the radial distance between the two sides of the notch 7 can be no narrower than the radial distance between the two channel walls of the stator cooling channel 6. Similarly, the circumferential distance between the two sides of the notch 7 can be no narrower than the circumferential distance between the two channel walls of the stator cooling channel 6. This ensures that the fluid at the end face of the stator cooling channel 6, especially at the edges, does not need to change direction and can flow directly into the notch 7. Specifically, the notch 7 can be slightly larger than the port of the stator cooling channel 6 to facilitate assembly. Alternatively, the notch 7 and the port of the stator cooling channel 6 can be of the same size and shape and aligned.

[0046] In some embodiments, as shown in the appendix Figure 3 , 5 As shown, the width of the notch 7 in the radial direction of the pressure ring 3 can be not less than the width h in the radial direction of the stator cooling channel 6. And / or the width L1 in the circumferential direction of the notch 7 in the pressure ring 3 can be not less than the width L in the circumferential direction of the stator cooling channel 6.

[0047] In some embodiments, a plurality of stator pull plates 2 may be uniformly arranged along the circumferential direction of the stator body 1, and a stator cooling channel 6 may be provided at each of the stator pull plates 2. For example, four stator pull plates 2 may be provided with an included angle of 90 degrees to each other.

[0048] In some embodiments, the stator pull plate 2 may have a hole extending to at least one end, the inner cavity of which serves as the stator cooling channel 6. Alternatively, the stator pull plate 2 may only have this hole, or a groove structure may be formed on the inner side of the stator pull plate 2, with both the groove structure and the hole forming the aforementioned stator cooling channel 6.

[0049] In some embodiments, a stator cooling channel 6 is formed between the stator body 1 and the stator tie plate 2, which can avoid opening a cooling channel in the stator body 1, maximize the use of the stator body 1, and enable the motor to achieve high-power operation without increasing size and meeting temperature rise requirements, or reduce the stator outer diameter at the same power.

[0050] Based on the motor stator structure provided in the above embodiments, the present invention also provides a motor, which includes any one of the motor stator structures in the above embodiments, including a rotor structure 4. An air gap cooling channel 8 can be further formed between the rotor structure 4 and the motor stator structure, and a rotor cooling channel 9 can be further provided in the rotor structure 4. Since this motor adopts the motor stator structure in the above embodiments, the beneficial effects of this motor are explained in the above embodiments.

[0051] In some embodiments, the air gap cooling channel 8 and the rotor cooling channel 9 are both connected to the above-mentioned inlet and outlet channels. For example, an air inlet cavity may be formed between one end of the pressure ring 3 and the corresponding end cap 5, while an air outlet cavity may be formed between the other end of the pressure ring 3 and the corresponding end cap 5.

[0052] In some embodiments, the heat of the motor is carried away by the cooling air in the three cooling channels mentioned above, so that the stator and rotor temperatures of the motor are balanced, avoiding stator overheating and extending the life of motor insulation.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electric machine stator structure comprising a stator main body, a stator tie plate provided radially outside the stator main body, and two pressure rings each provided at both ends of the stator tie plate, characterized in that, At least one of the stator pull plates is provided with a stator cooling channel; at least one of the pressure rings is provided with a notch that is in communication with the stator cooling channel; The stator pull plate is provided with a groove structure on the inner side, and the groove structure and the stator body combine to form the stator cooling channel; The stator pull plate is in an arc shape in cross section; Both of the pressure rings at the two ends of the stator pull plate are provided with the notch to respectively butt against the two ends of the stator cooling channel.

2. The motor stator structure of claim 1, wherein The radial side edge distance of the notch is not less than the radial side channel wall distance of the stator cooling channel.

3. The motor stator structure of claim 2, wherein The two ends of the stator pull plate are respectively welded and fixed with the pressure rings at the two ends, and the pressure rings at the two ends are respectively in abutment with the two ends of the stator body.

4. The motor stator structure of claim 3, wherein A plurality of stator pull plates are uniformly arranged along the circumferential direction of the stator body, and each of the stator pull plates is provided with the stator cooling channel.

5. The motor stator structure of claim 4, wherein The circumferential width of all the stator cooling channels corresponds to a total sum of central angle degrees of not less than 120 degrees.

6. The motor stator structure of any one of claims 1-5, wherein, The stator pull plate is provided with a hole that penetrates to one end, and the inner cavity of the hole is the stator cooling channel.

7. An electric machine comprising a rotor structure, characterized in that Further comprising the motor stator structure according to any one of claims 1-6, the rotor structure and the motor stator structure form an air gap cooling channel, and the rotor structure is provided with a rotor cooling channel.

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