An electric motor and an electric motor system

Abstract

This invention provides an electric motor and a motor system, including a housing and a stator core, a rotor core, and a shaft located within the housing. The rotor core is sleeved on the shaft, and the stator core surrounds the rotor core and is fixed to the inner circumferential wall of the housing. An air gap is provided between the rotor core and the stator core. A winding is provided on the stator core. An annular shroud is also provided inside the housing. The annular shroud includes an annular partition and a cylindrical partition. The outer edge of the annular partition is fixed to the inner wall of the housing, and the cylindrical partition is connected to the inner edge of the annular partition. A receiving cavity is formed between the cylindrical partition and the wall of the housing. The portion of the winding protruding from the stator core is located within the receiving cavity. A first injection hole is provided on the housing, and a first flow channel is provided on the outer side of the outer circumferential surface of the stator core. One end of the first flow channel connects the first injection hole and the receiving cavity, thereby solving the technical problem of poor cooling effect of the stator winding in the prior art.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric machines, and particularly relates to an electric machine and an electric machine system. BACKGROUND

[0002] Motor cooling has a great influence on the performance of the motor, and the cooling effect of the motor and the high temperature of the motor limit the high power density and torque density of the motor. Good heat dissipation cooling has a great effect on the performance improvement of the motor. The existing motor cooling has air cooling, water cooling, oil cooling and other cooling technologies, but the air cooling, water cooling and oil cooling have limited cooling effect on the winding end part and the internal part of the motor core; especially the winding part on the stator of the motor, except the part of the winding in contact with the stator core, the remaining part of the winding is suspended and does not contact the outside, the specific heat capacity of air is low, and the cooling effect of air cooling itself is poor; water cooling and oil cooling are difficult to completely cover the suspended winding, and the cooling effect of the suspended winding is poor.

[0003] How to effectively cool the motor, especially the suspended part of the winding, is a technical problem that needs to be solved at present. SUMMARY

[0004] Therefore, the present application provides an electric machine and an electric machine system, which can solve the technical problem of poor cooling effect of the stator winding in the motor in the prior art.

[0005] In one aspect, the present application provides an electric machine, comprising a machine shell, a stator core, a rotor core and a rotating shaft located in the machine shell, the rotor core is sleeved on the rotating shaft, the stator core is wrapped outside the rotor core and is fixed on the inner circumferential wall of the machine shell, an air gap is arranged between the rotor core and the stator core, a winding is arranged on the stator core, and an annular cover is further arranged in the machine shell, the annular cover comprises an annular partition plate and a cylindrical partition plate, the outer edge of the annular partition plate is fixed on the inner wall surface of the machine shell, and the cylindrical partition plate is connected to the inner edge of the annular partition plate, wherein a containing cavity is formed between the cylindrical partition plate, the annular partition plate and the wall surface of the machine shell, and the part of the winding protruding from the stator core is located in the containing cavity.

[0006] A first injection hole is arranged on the machine shell, a first flow channel is arranged outside the outer circumferential surface of the stator core, and one end of the first flow channel is communicated with the first injection hole and the containing cavity.

[0007] In some embodiments, an air gap is arranged between the stator core and the rotor core, and a second flow channel is arranged inside the stator core and communicated between the first flow channel and the air gap.

[0008] In some embodiments, the rotating shaft is provided with a second injection hole, the rotating shaft is provided with a third flow channel, the rotor core is provided with a fourth flow channel penetrating the rotor core in the axial direction, and the third flow channel is in communication with the second injection hole and the fourth flow channel.

[0009] In some embodiments, the rotor core is provided with a baffle at each of the axial ends, the baffles are opposite to the cylindrical partition in the axial direction, and a preset gap is provided between the baffles and the cylindrical partition.

[0010] In some embodiments, the machine housing is provided with an end cover at each of the two ends, one of the end covers is a first end cover, the annular partition adjacent to the first end cover is a first partition, a discharge passage is provided between the first end cover and the first partition, the machine housing is provided with a discharge hole, and the discharge hole is in communication with the discharge passage.

[0011] In some embodiments, when the third flow channel and the fourth flow channel are provided, at least one of the first flow channel, the third flow channel and the fourth flow channel is provided with a flow disturbing member.

[0012] In some embodiments, the motor further comprises a stator partition, the stator partition comprises a plurality of first rods extending in the radial direction, and the plurality of first rods are fixed together through a first circular ring; the stator partition is further provided with a sixth flow channel, and the sixth flow channel flows through the first circular ring in the radial direction.

[0013] The stator partition is arranged inside the stator core, and the second flow channel is formed between two adjacent first rods.

[0014] In some embodiments, a first end of the first rod faces the outside of the radial direction, a second end of the first rod faces the inside of the radial direction, and a gap is provided between the first end of the first rod and the inner wall surface of the machine housing.

[0015] The first circular ring is located at the first end of the first rod, or the first circular ring is located at the second end of the first rod, or the first circular ring is fixed at the middle part of the first rod.

[0016] In some embodiments, the stator partition further comprises a second circular ring, when the first circular ring is arranged at the first end of the first rod, the second circular ring is arranged at the second end of the first rod, and the first circular ring and the second circular ring are both provided with a second through hole extending in the radial direction.

[0017] In some embodiments, in the axial direction, the size of the first circular ring is smaller than the size of the first rod, or the first circular ring is provided with a first through hole.

[0018] In some embodiments, the motor further comprises a rotor spacer, the rotor spacer comprises a plurality of second bars extending along a radial direction, and the plurality of second bars are fixed together by a third ring; and the rotor spacer is further provided with a seventh flow channel flowing through the third ring along the radial direction.

[0019] The rotor spacer is arranged inside the rotor core, a fifth flow channel is formed between two adjacent second bars, and the third flow channel corresponds to the fifth flow channel one by one.

[0020] In some embodiments, a first end of the second bar faces an outer side of the radial direction, and a second end of the second bar faces an inner side of the radial direction.

[0021] The third ring is located at the first end of the second bar, or the third ring is located at the second end of the second bar, or the third ring is fixed at the middle part of the second bar.

[0022] In some embodiments, the rotor spacer further comprises a fourth ring and an eighth flow channel flowing through the fourth ring along the radial direction, the fourth ring and the third ring are separately arranged at two ends of the second bar, and the fourth ring and the third ring are both provided with fourth through holes extending along the radial direction.

[0023] In some embodiments, in the axial direction, the third ring has a size smaller than that of the second bar, or the third ring is provided with a third through hole.

[0024] The application further provides a motor system, comprising a pressurizing pump, a cooling container and the motor, the cooling container is provided with cooling paste, when the cooling container is provided with a second injection hole and an exhaust hole, an inlet of the pressurizing pump is communicated with an outlet of the cooling container, an outlet of the pressurizing pump is communicated with the first injection hole and the second injection hole, and the exhaust hole is communicated with an inlet of the cooling container.

[0025] The application realizes sufficient cooling of the winding in the accommodating cavity by arranging the annular spacer outside the winding at one end of the stator core, arranging the winding in the accommodating cavity, making the cooling paste enter the accommodating cavity under the action of pressure, and then making the cooling paste sufficiently diffuse in the accommodating cavity to coat the winding in the accommodating cavity. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0027] Figure 1 This is a cross-sectional view of the motor according to an embodiment of the present invention;

[0028] Figure 2 This is an embodiment of the present invention. Figure 1 Enlarged view of point A in the middle;

[0029] Figure 3 This is an embodiment of the present invention. Figure 1 Enlarged view at point B in the middle;

[0030] Figure 4 This is a cross-sectional view of the motor according to an embodiment of the present invention, wherein the motor is provided with stator spacers and rotor spacers;

[0031] Figure 5 This is an embodiment of the present invention. Figure 4 Enlarged view at point C;

[0032] Figure 6 This is a schematic diagram of the baffle element according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the first rod of the present invention having a first ring and a second ring provided on it;

[0034] Figure 8 This is a schematic diagram of a stator spacer with a through hole when the first ring is disposed at the second end of the first rod according to an embodiment of the present invention.

[0035] Figure 9 This is a schematic diagram of a stator spacer in which the first ring is disposed at the second end of the first rod, and the axial dimension of the first ring is smaller than the dimension of the first rod.

[0036] Figure 10 This is a schematic diagram of a stator spacer with a through hole, where the first ring is disposed in the middle of the first rod according to an embodiment of the present invention.

[0037] Figure 11 This is a schematic diagram of a stator spacer in an embodiment of the present invention, where the first ring is disposed in the middle of the first rod, and the axial dimension of the first ring is smaller than the dimension of the first rod.

[0038] Figure 12 This is a schematic diagram of the second rod of the present invention having a third ring and a fourth ring.

[0039] Figure 13 This is a schematic diagram of a rotor spacer when the third ring is disposed at the second end of the second rod in an embodiment of the present invention and the third ring is provided with a through hole;

[0040] Figure 14This is a schematic diagram of a rotor spacer where the third ring is disposed at the second end of the second rod in an embodiment of the present invention, and the axial dimension of the third ring is smaller than that of the second rod.

[0041] Figure 15 This is a schematic diagram of a rotor spacer when the third ring is disposed in the middle of the second rod according to an embodiment of the present invention and the third ring is provided with a through hole;

[0042] Figure 16 This is a schematic diagram of a rotor spacer where the third ring is disposed in the middle of the second rod in an embodiment of the present invention, and the axial dimension of the third ring is smaller than that of the second rod.

[0043] The attached figures are labeled as follows:

[0044] 1. Stator core; 101. Winding; 2. Rotor core; 201. Baffle; 202. Preset gap; 203. Annular flow channel; 3. Shaft; 4. Air gap; 5. Annular shroud; 501. Annular shroud; 502. Cylindrical shroud; 503. Receiving cavity; 504. Outlet hole; 601. First injection hole; 602. Second injection hole; 701. First flow channel; 702. Second flow channel; 703. 704. Third flow channel; 705. Fourth flow channel; 706. Fifth flow channel; 707. Sixth flow channel; 708. Seventh flow channel; 709. Eighth flow channel; 801. End cap; 802. Discharge channel; 803. Discharge hole; 804. Baffle; 901. First rod; 9011. First ring; 9012. Second ring; 902. Second rod; 9021. Third ring; 9022. Fourth ring; Detailed Implementation

[0045] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. 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.

[0046] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0047] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0048] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0049] See also Figures 1-16 As shown, the present invention provides an electric motor, including a housing and a stator core 1, a rotor core 2, and a shaft 3 located within the housing. The rotor core 2 is sleeved on the shaft 3. The stator core 1 surrounds the rotor core 2 and is fixed to the inner circumferential wall of the housing. An air gap 4 is provided between the rotor core 2 and the stator core 1. A winding 101 is provided on the stator core 1. An annular shroud 5 is also provided inside the housing. The annular shroud 5 includes an annular partition 501 and a cylindrical partition 502. The outer edge of the annular partition 501 is fixed to the inner wall of the housing. The cylindrical partition 502 is connected to the inner edge of the annular partition 501. A receiving cavity 503 is formed between the cylindrical partition 502, the annular partition 501, and the wall of the housing. The portion of the winding 101 protruding from the stator core 1 is located within the receiving cavity 503.

[0050] The housing is provided with a first injection hole 601, and the outer side of the stator core 1 is provided with a first flow channel 701, one end of the first flow channel 701 is connected to the first injection hole 601 and the receiving cavity 503.

[0051] By setting an annular shroud 5, the first flow channel 701 connects the first injection hole 601 and the receiving cavity 503 formed by the annular shroud 5. The two ends of the winding 101 on the stator core 1 are set in the receiving cavity 503. When the cooling paste (cooling paste refers to a molten cooling substance, a solid with a certain fluidity, similar to toothpaste) is injected, the cooling paste can enter the receiving cavity 503. Since the fluidity of the cooling paste itself is worse than that of liquid cooling oil, the cooling paste can fully diffuse in the receiving cavity 503 under pressure and fully cover the winding 101 in the receiving cavity 503, thereby improving the cooling effect on the winding 101; specifically, the suspended part of the winding 101 is better cooled. The suspended part of the winding 101 refers to the part of the winding 101 located on the axial outer side of the stator core 1 after the winding 101 is completed on the stator core 1. This part of the winding 101 does not contact other solid structures in the radial and circumferential directions.

[0052] In this application, the axial direction refers to the axial direction of the rotating shaft 3, the circumferential direction refers to the axial direction of the rotating shaft 3, and the radial direction refers to the radial direction of the rotating shaft 3.

[0053] Preferred, such as Figure 1 , Figure 2 and Figure 5 As shown, an air gap 4 is provided between the stator core 1 and the rotor core 2, and a second flow channel 702 is provided inside the stator core 1 to connect the first flow channel 701 and the air gap 4.

[0054] When the temperature of the cooling paste rises due to heat, the paste will turn into a liquid. For ease of explanation, the cooling fluid mentioned below includes both paste and liquid states of the cooling substance.

[0055] By setting up a second flow channel 702, the cooling fluid flowing in the first flow channel 701 can enter the second flow channel 702 under pressure, and then enter the air gap 4. When the cooling fluid flows in the second flow channel 702, it can effectively cool the interior of the stator core 1. After the cooling fluid enters the air gap 4, on the one hand, the cooling paste flows in the air gap 4 along the axial direction, and on the other hand, the cooling fluid flows in the air gap 4 along the circumferential direction under the action of the rotor's rotation. Thus, it can efficiently cool the inner circumferential surface of the stator core 1 and the outer circumferential surface of the rotor in both the axial and circumferential directions.

[0056] Cooling paste absorbs heat when it melts into a cooling liquid. Therefore, the use of cooling paste also helps to absorb heat and cool the motor.

[0057] Preferred, such as Figure 1As shown, the rotating shaft 3 is provided with a second injection hole 602, the rotating shaft 3 is provided with a third flow channel 703, and the rotor core 2 is provided with a fourth flow channel 704 that penetrates the rotor core 2 in the axial direction. The third flow channel 703 connects the second injection hole 602 and the fourth flow channel 704.

[0058] By providing a second injection hole 602 on the rotating shaft 3 and a fourth flow channel 704 on the rotor core 2, when cooling fluid is injected through the second injection hole 602, the cooling paste enters the fourth flow channel 704 through the third flow channel 703 to effectively cool the rotor core 2. The cooling fluid itself has poorer fluidity than cooling oil. Under the action of external pressure, the cooling fluid diffuses fully in the third flow channel 703 and the fourth flow channel 704, thereby improving the cooling effect on the rotating shaft 3 and the rotor core 2.

[0059] Preferred, such as Figure 1 , Figure 2 As shown, baffles 201 are provided at both ends of the rotor core 2 in the axial direction. In the axial direction, the baffles 201 are opposite to the cylindrical partition 502, and a preset gap 202 is provided between the baffles 201 and the cylindrical partition 502.

[0060] Because of the preset gap 202, the coolant in the receiving cavity 503 flows out from the preset gap 202 under pressure. Since the preset gap 202 is set between the baffle 201 and the cylindrical partition 502, the baffle 201 rotates relative to the cylindrical partition 502, which allows the coolant to act as a lubricant between the baffle 201 and the cylindrical partition 502 to lubricate their relative movement.

[0061] Furthermore, an outlet hole 504 is provided on the cylindrical partition 502, so that the cooling fluid in the receiving cavity 503 can flow out not only from the preset gap 202, but also from the outlet hole 504.

[0062] Furthermore, a baffle 201 is provided at each end of the rotor core 2, and an annular shroud 5 is provided at each end of the stator core 1. The rotor core 2 is positioned between the two cylindrical shrouds 502, which provide axial restraint for the rotor core 2. When the rotor is subjected to axial force, in addition to the bearings providing axial restraint for the shaft 3, the two cylindrical shrouds 502 also provide axial restraint for the rotor core 2. Since the rotor core 2 is fixed on the shaft 3, it also provides axial restraint for the shaft 3. Because the output performance of the motor is closely related to the electromagnetic force between the stator and rotor, the positional relationship between the stator core 1 and the rotor core 2 in the axial direction directly affects the magnitude and stability of the force between the stator and rotor. By directly restraining the rotor core 2 in the axial direction through the two cylindrical shrouds 502, the position between the rotor core 2 and the stator core 1 becomes relatively stable, thus improving the stability of the motor's output performance.

[0063] Preferred, such as Figure 1 As shown, the housing is provided with end caps 801 at both ends, one of which is a first end cap 801. An annular partition 501 adjacent to the first end cap 801 is a first partition. A discharge channel 802 is provided between the first end cap 801 and the first partition. The housing is provided with a discharge hole 803, which communicates with the discharge channel 802.

[0064] By providing a discharge hole 803 on the housing between the first end cover 801 and the first partition, the cooling fluid injected from the first injection hole 601 and the second injection hole 602 can flow and diffuse fully inside the housing before flowing out from the discharge hole 803, which is beneficial to improving the cooling effect inside the motor housing.

[0065] Furthermore, the other of the two end caps 801 is a second end cap 801, and the other of the two annular partitions 501 is a second partition. A discharge hole 803 may also be provided on the housing between the second partition and the second end cap 801.

[0066] Preferably, when a third flow channel 703 and a fourth flow channel 704 are provided, at least one of the first flow channel 701, the third flow channel 703 and the fourth flow channel 704 is provided with a flow deflector 804.

[0067] The flow disruptor 804 is used to disrupt the flow of cooling fluid to prevent the part of the cooling fluid in contact with the solid structure from being at a higher temperature while the rest of the fluid is at a lower temperature, which would prevent the cooling fluid from effectively cooling the solid structure.

[0068] Specifically, the spoiler 804 consists of two mutually perpendicular metal plates.

[0069] Preferred, such as Figure 4 ,Figure 5 , Figures 7 to 11 As shown, the motor also includes a stator spacer, which includes a plurality of first rods 901 extending in the radial direction, the plurality of first rods 901 being fixed together by a first ring 9011; the stator spacer is also provided with a sixth flow channel 706, the sixth flow channel 706 flowing through the first ring 9011 in the radial direction.

[0070] The stator spacer is disposed inside the stator core 1, and the second flow channel 702 is formed between two adjacent first rods 901.

[0071] By setting a stator spacer, the second flow channel 702 is placed between the two first rods 901, which can ensure the integrity of the stator core 1, avoid the need to drill holes in the stator core 1 to form flow and thus prevent damage. This is beneficial to ensure the smoothness of the magnetic circuit inside the stator and avoid excessive local magnetic flux density.

[0072] The first ring 9011 is used to fix multiple first rods 901 together, install stator spacers, and prevent the first ring 9011 from blocking the second flow channel 702.

[0073] The number of 901s in the first stroke must be at least 3.

[0074] Preferred, such as Figure 4 , Figure 5 , Figures 7 to 11 As shown, the first end of the first rod 901 faces outward in the radial direction, the second end of the first rod 901 faces inward in the radial direction, and a gap is provided between the first end of the first rod 901 and the inner wall surface of the housing.

[0075] The first ring 9011 is located at the first end of the first rod 901, or the first ring 9011 is located at the second end of the first rod 901, or the first ring 9011 is fixed to the middle of the first rod 901.

[0076] The first ring 9011 is located at the first end of the first rod 901. An annular flow channel 203 is formed between the first ring 9011 and the inner wall of the housing. The annular flow channel 203 includes the aforementioned interval. After entering the annular flow channel 203, the cooling paste flows along the circumferential channel and simultaneously enters the space between two adjacent first rods 901 via the sixth flow channel 706. This helps to increase the contact area between the cooling fluid and the inner side of the stator core 1, thereby improving the cooling effect on the inner side of the stator core 1. As the cooling fluid flows, the temperature of the cooling fluid will... The temperature of the cooling fluid increases, and after the cooling fluid is injected from the first injection hole 601 and enters the second flow channel 702, it first flows through the outside of the stator core 1 and then flows to the inside of the stator core 1. By fixing the first ring 9011 to the first end of the first rod 901 (that is, close to the outside of the stator core 1), the contact area between the cooling fluid and the inside of the stator core 1 is increased. Although the temperature of the cooling fluid increases, the contact area between the cooling fluid and the stator core 1 also increases, thus improving the overall cooling effect on the stator core 1.

[0077] The first ring 9011 is located at the second end of the first rod 901. When the cooling fluid enters from the first injection hole 601, the cooling fluid can first fill one second flow channel 702 (the second flow channel 702 closest to the first injection hole 601) with cooling paste (at this time, the cooling paste has not yet melted into liquid). Due to the action of the first ring 9011, the cooling paste passes through the sixth flow channel 706 at a slower speed. The cooling paste flows along the interval circumferential direction into other second flow channels 702. In this way, the cooling paste can fill each second flow channel 702 one by one, avoiding uneven cooling of the stator core 1 caused by some second flow channels 702 not being completely filled.

[0078] The first ring 9011 is fixed in the middle of the first rod 901. The cooling paste first fills the second flow channel 702 on the outer side of the first ring 9011. Then, a part of the cooling paste enters the inner side of the first ring 9011 through the sixth flow channel 706, and a part of the cooling paste flows to other second flow channels 702 through intervals. In this way, to a certain extent, each second flow channel 702 has a certain amount of cooling paste to uniformly cool the stator core 1. At the same time, it also ensures that the cooling paste has sufficient contact with the inner side of the stator core 1, thereby cooling the stator core 1 more uniformly.

[0079] Preferred, such as Figure 7 As shown, the stator spacer also includes a second ring 9012. When the first ring 9011 is disposed at the first end of the first rod 901, the second ring 9012 is disposed at the second end of the first rod 901. Both the first ring 9011 and the second ring 9012 are provided with a second through hole extending in the radial direction.

[0080] Both ends of the first rod 901 are provided with rings. The first ring 9011 and the second ring 9012 are both provided with second through holes. The second through hole on the first ring 9011 is the sixth flow channel 706. Thus, after the coolant enters through the first injection hole 601, it flows along the annular interval, ensuring that the coolant can enter all the second flow channels 702 relatively evenly. Simultaneously, it enters the inner side of the first ring 9011 through the second hole (i.e., the sixth flow channel 706). With the obstruction of the second ring 9012, it ensures that each second flow channel 702 is filled. The coolant enters the gap through the second through hole on the second ring 9012. The number of second through holes between two adjacent first rods 901 is at least two.

[0081] In this application, the inner side refers to the side closer to the axis of the rotating shaft 3, and the corresponding side farther away from the axis of the rotating shaft 3 is the outer side.

[0082] Preferably, in the axial direction, the size of the first ring 9011 is smaller than the size of the first rod 901, or the first ring 9011 is provided with a first through hole.

[0083] In the axial direction, such as Figure 9 and Figure 11 As shown, the size of the first ring 9011 is smaller than that of the first rod 901. Cooling fluid flows from both sides of the first ring 9011 (in the axial direction, both sides of the first ring 9011), which increases the contact area between the cooling fluid and the stator core 1, thereby improving the cooling efficiency of the stator core 1. The flow resistance of the cooling fluid is also lower, which is beneficial for increasing the flow velocity of the cooling fluid. There are at least two first through holes between two adjacent first rods 901.

[0084] like Figure 8 and Figure 10 As shown, a first through hole is provided on the first ring 9011. The first ring 9011 contacts the stator core 1 and has a supporting and flattening effect on the stator core 1, which is beneficial to the production of the stator core 1.

[0085] Furthermore, through holes can be provided on both the first ring 9011 and the second ring 9012, and their axial dimensions can be smaller than the dimensions of the first rod 901.

[0086] Preferred, such as Figure 4 , Figure 5 Figures 12-16 The motor further includes a rotor spacer, which includes a plurality of second rods 902 extending in a radial direction, the plurality of second rods 902 being fixed together by a third ring 9021; the rotor spacer is also provided with a seventh flow channel 707, the seventh flow channel 707 flowing through the third ring 9021 in a radial direction;

[0087] The rotor spacer is disposed inside the rotor core 2, and a fifth flow channel 705 is formed between two adjacent second rods 902. The third flow channel 703 corresponds one-to-one with the fifth flow channel 705.

[0088] The second rod 902 helps ensure the integrity of the rotor core 2. The third ring 9021 helps ensure the stability of the fixation of multiple second rods 902.

[0089] Furthermore, the third flow channel 703 corresponds one-to-one with the fifth flow channel 705. When the shaft 3 rotates, the coolant can flow more evenly to all sides and enter the fifth flow channel 705 evenly through the third flow channel 703.

[0090] In the axial direction, the fifth flow channel 705 is offset from the second flow channel 702. That is, the fifth flow channel 705 and the second flow channel 702 are connected by an air gap 4 extending in the axial direction, which increases the cooling area of ​​the cooling fluid on the rotor core 2 and the stator core 1 and improves the cooling effect.

[0091] The number of 902s in the second stroke is at least 3.

[0092] Preferred, such as Figures 13-16 As shown, the first end of the second rod 902 faces outward in the radial direction, and the second end of the second rod 902 faces inward in the radial direction;

[0093] The third ring 9021 is located at the first end of the second rod 902, or the third ring 9021 is located at the second end of the second rod 902, or the third ring 9021 is fixed to the middle of the second rod 902.

[0094] The third ring 9021 is located at the first end of the second rod 902. The third ring 9021 acts as a barrier to the cooling paste. After the cooling paste enters the fifth channel 705 from the third channel 703, it will gradually fill the fifth channel 705, thereby improving the cooling effect on the rotor core 2.

[0095] The third ring 9021 is located at the second end of the second rod 902, which increases the contact area between the cooling paste and the outer part of the rotor core 2. This allows the cooling paste to flow from the inside to the outside and increase in temperature. The increased contact area between the higher-temperature cooling paste and the rotor core 2 helps to cool the outer part of the rotor core 2 in a timely manner and helps to ensure the overall temperature balance of the rotor core 2.

[0096] The third ring 9021 is fixed in the middle of the second rod 902. The cooling paste fills the space between two adjacent second rods 902 on the inner side of the third ring 9021. The outer side of the third ring 9021 has a large contact area with the rotor core 2, which improves the cooling effect on the rotor core 2.

[0097] Preferred, such as Figure 12 , Figure 13 and Figure 15 As shown, the rotor spacer also includes a fourth ring 9022 and an eighth flow channel 708 that flows through the fourth ring 9022 in the radial direction. The fourth ring 9022 and the third ring 9021 are respectively disposed at both ends of the second rod 902. Both the fourth ring 9022 and the third ring 9021 are provided with a fourth through hole extending in the radial direction.

[0098] By setting a third ring 9021, and a fourth ring 9022 at both ends of the second rod 902, since the rotor core 2 is rotating, the ring located on the inner side of the second rod 902 can prevent the cooling fluid from flowing too fast to the outside under the action of centrifugal force, resulting in insufficient contact between the cooling fluid and the rotor core 2 and reduced cooling effect. Similarly, the ring located on the outer side of the second rod 902 can also slow down the flow speed of the cooling fluid, thereby allowing the cooling fluid to fully contact the rotor core 2 and preventing some rotor core 2 from not being able to contact the cooling fluid and thus overheating. By setting the aforementioned third ring 9021 and fourth ring 9022, the cooling effect on the rotor core 2 is improved.

[0099] There are at least two fourth through holes between two adjacent second rods 902.

[0100] Furthermore, the third ring 9021 is located on the inner side, and the fourth ring 9022 is located on the outer side.

[0101] Preferably, in the axial direction, the size of the third ring 9021 is smaller than the size of the second rod 902, or the third ring 9021 is provided with a third through hole.

[0102] In the axial direction, such as Figure 14 and Figure 16 As shown, the size of the third ring 9021 is smaller than that of the second rod 902. The cooling fluid flows from both sides (axial direction) of the third ring 9021, which helps to increase the contact area between the cooling fluid and the rotor core 2 and improve the cooling efficiency of the rotor core 2.

[0103] The third ring 9021 is provided with a third through hole, such as Figure 13 and Figure 15 As shown, this increases the resistance to the cooling fluid, preventing the cooling fluid from flowing outwards too quickly under the centrifugal force generated by rotation.

[0104] There are at least two third through holes between two adjacent second rods 902.

[0105] Furthermore, through holes can be provided on both the third ring 9021 and the fourth ring 9022, and their axial dimensions can be smaller than those of the second rod 902.

[0106] The present invention also provides a motor system, including a pressurizing pump, a cooling container and the motor, wherein the cooling container is provided with cooling paste, and when a second injection hole 602 and an discharge hole 803 are provided, the inlet of the pressurizing pump is connected to the outlet of the cooling container, the outlet of the pressurizing pump is connected to both the first injection hole 601 and the second injection hole 602, and the discharge hole 803 is connected to the inlet of the cooling container.

[0107] Cooling paste is used to cool the motor. A pressure pump pressurizes the coolant, causing it to flow within the motor and reach every corner, thus improving cooling efficiency. The process of the coolant melting into a liquid state after absorbing heat also absorbs heat, further enhancing the cooling effect. The cooling fluid flowing out of the discharge port 803 re-enters the cooling container for further cooling. The cooled, paste-like fluid is then pumped back into the motor through the first injection port 601 and the second injection port 602.

[0108] The pressure pump can be a plunger pump.

[0109] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0110] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An electric machine comprising a casing and a stator core (1), a rotor core (2) and a rotor shaft (3) located in the casing, the rotor core (2) being fitted on the rotor shaft (3), the stator core (1) being fitted around the rotor core (2) and being fixed to the inner peripheral wall of the casing, an air gap (4) being provided between the rotor core (2) and the stator core (1), characterized in that, The stator core (1) is provided with a winding (101), and the machine shell is further provided with an annular cover (5), the annular cover (5) comprises an annular partition plate (501) and a cylindrical partition plate (502), the outer edge of the annular partition plate (501) is fixed on the inner wall surface of the machine shell, the cylindrical partition plate (502) is connected to the inner edge of the annular partition plate (501), the cylindrical partition plate (502), the annular partition plate (501) and the wall surface of the machine shell form a containing cavity (503), and the part of the winding (101) protruding from the stator core (1) is located in the containing cavity (503); The machine shell is provided with a first injection hole (601), and the outer circumferential surface of the stator core (1) is provided with a first flow channel (701), one end of the first flow channel (701) being communicated with the first injection hole (601) and the containing cavity (503); The rotor core (2) is provided with a baffle (201) at both axial ends, and the baffle (201) is opposite to the cylindrical partition plate (502) in the axial direction, and a preset gap (202) is arranged between the baffle (201) and the cylindrical partition plate (502).

2. The electric machine of claim 1, wherein, The stator core (1) and the rotor core (2) are provided with an air gap (4), and the stator core (1) is provided with a second flow channel (702) communicated between the first flow channel (701) and the air gap (4).

3. The electric machine of claim 1, wherein, The rotating shaft (3) is provided with a second injection hole (602), the rotating shaft (3) is provided with a third flow channel (703), the rotor core (2) is provided with a fourth flow channel (704) penetrating the rotor core (2) in the axial direction, and the third flow channel (703) is communicated with the second injection hole (602) and the fourth flow channel (704).

4. The electric machine of any of claims 1-3, wherein, Both ends of the machine shell are provided with end covers (801), one of the end covers (801) is a first end cover (801), the annular partition plate (501) adjacent to the first end cover (801) is a first partition plate, a discharge channel (802) is arranged between the first end cover (801) and the first partition plate, the machine shell is provided with a discharge hole (803), and the discharge hole (803) is communicated with the discharge channel (802).

5. The electric machine of claim 4, wherein, When the third flow channel (703) and the fourth flow channel (704) are arranged, at least one of the first flow channel (701), the third flow channel (703) and the fourth flow channel (704) is provided with a flow disturbing piece (804).

6. The electric machine of claim 2, wherein, The motor further comprises a stator partition, the stator partition comprises a plurality of first rods (901) extending along the radial direction, and the plurality of first rods (901) are fixed together through a first circular ring (9011); the stator partition is further provided with a sixth flow channel (706), and the sixth flow channel (706) flows through the first circular ring (9011) along the radial direction; The stator partition is arranged in the stator core (1), and the second flow channel (702) is formed between two adjacent first rods (901).

7. The electric machine of claim 6, wherein, The first end of the first rod (901) is directed to the outside of the radial direction, the second end of the first rod (901) is directed to the inside of the radial direction, and a space is arranged between the first end of the first rod (901) and the inner wall surface of the shell; The first circular ring (9011) is located at the first end of the first rod (901), or the first circular ring (9011) is located at the second end of the first rod (901), or the first circular ring (9011) is fixed at the middle part of the first rod (901).

8. The electric machine of claim 7, wherein, The stator partition further comprises a second circular ring (9012), when the first circular ring (9011) is arranged at the first end of the first rod (901), the second circular ring (9012) is arranged at the second end of the first rod (901), and the first circular ring (9011) and the second circular ring (9012) are both provided with a second through hole extending along the radial direction.

9. The electric machine of claim 7, wherein, In the axial direction, the size of the first circular ring (9011) is smaller than the size of the first rod (901), or the first circular ring (9011) is provided with a first through hole.

10. The electric machine of claim 3, wherein, The motor further comprises a rotor partition, the rotor partition comprises a plurality of second rods (902) extending along the radial direction, and the plurality of second rods (902) are fixed together through a third circular ring (9021); the rotor partition is further provided with a seventh flow channel (707) flowing through the third circular ring (9021) along the radial direction; The rotor partition is arranged inside the rotor core (2), and a fifth flow channel (705) is formed between two adjacent second rods (902), and the third flow channel (703) corresponds to the fifth flow channel (705) one by one.

11. The electric machine of claim 10, wherein, The first end of the second rod (902) is directed to the outside of the radial direction, and the second end of the second rod (902) is directed to the inside of the radial direction; The third circular ring (9021) is located at the first end of the second rod (902), or the third circular ring (9021) is located at the second end of the second rod (902), or the third circular ring (9021) is fixed at the middle part of the second rod (902).

12. The electric machine of claim 10, wherein, The rotor partition further comprises a fourth circular ring (9022) and an eighth flow channel (708) flowing through the fourth circular ring (9022) along the radial direction, and the fourth circular ring (9022) and the third circular ring (9021) are arranged at the two ends of the second rod (902), and the fourth circular ring (9022) and the third circular ring (9021) are both provided with a fourth through hole extending along the radial direction.

13. The electric machine of claim 10 or 11, wherein, In the axial direction, the size of the third circular ring (9021) is smaller than the size of the second rod (902), or the third circular ring (9021) is provided with a third through hole.

14. An electric machine system characterized by The motor comprises a pressurizing pump, a cooling container, and the motor of any one of claims 1-13, wherein the cooling container is provided with a cooling paste, an inlet of the pressurizing pump is communicated with an outlet of the cooling container, an outlet of the pressurizing pump is communicated with the first injection hole (601) and the second injection hole (602), and the discharge hole (803) is communicated with the inlet of the cooling container.

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