Electric pump

Abstract

The utility model relates to an electric pump, the electric pump comprises a stator assembly, the stator assembly comprises a stator iron core and an insulation frame, the insulation frame is fixedly connected with the stator iron core, the insulation frame comprises a yoke insulation frame and a neck insulation frame, the stator assembly is provided with a winding wire slot, and the winding wire slot is connected with the yoke insulation frame and the neck insulation frame. The winding wire slots are located between the adjacent neck insulation frames, and at least part of the windings of the stator assembly are located in the winding wire slots; the electric pump comprises a circuit board and a motor shell, the electric pump comprises a grounding piece, the grounding piece is electrically connected with the circuit board, the grounding piece is electrically connected with the stator iron core, and the stator iron core is in contact with a conductive part in the motor shell; the yoke insulation frame comprises an installation part, part of the inner circumferential wall of the installation part is the groove wall of the winding wire groove, the installation part is provided with a grounding hole, and at least part of the grounding piece is located in the grounding hole. According to the invention, good slot fill factor and electromagnetic compatibility are realized.

Description

Technical Field

[0001] The present application relates to components of a vehicle lubrication system and / or cooling system, in particular to an electric pump. Background Art

[0002] The electric pump provides a power source for the vehicle's cooling system and / or lubrication system. During the operation of the electric pump, the stator core of the stator assembly will form a suspended voltage to the ground, which will cause intermittent breakdown discharge of the stator core to the ground, making the electric pump's electromagnetic compatibility poor. Currently, the formation of suspended voltage is generally avoided by electrically connecting the electric pump's circuit board and grounding piece, electrically connecting the stator core and grounding piece, and electrically connecting the stator core and motor housing. If a component for placing the above-mentioned grounding piece is provided on the stator core, the slot fill rate may be reduced. Utility Model Content

[0003] In order to eliminate the floating voltage generated by the stator core to the ground, the stator core is provided with a receiving portion for placing a grounding piece. The receiving portion extends from the core yoke to the center axis of the stator core, and the partial winding slots that accommodate part of the winding are located between two adjacent core necks. The winding space of the winding is reduced, and the slot fill rate of the stator assembly is reduced. The purpose of this application is to obtain an electric pump, which is conducive to the electric pump having a better slot fill rate.

[0004] The technical solutions adopted in this application are as follows:

[0005] An electric pump, comprising a stator assembly, the stator assembly comprising a stator core and an insulating frame, the insulating frame being fixedly connected to the stator core, the insulating frame comprising a yoke insulating frame and a neck insulating frame, the stator assembly having winding slots, the winding slots being located between adjacent neck insulating frames, and at least part of the windings of the stator assembly being located in the winding slots; the electric pump comprising a circuit board and a motor housing, the electric pump comprising a grounding member, the grounding member being electrically connected to the circuit board and the stator core, the stator core being in contact with a conductive portion of the motor housing; the yoke insulating frame comprising a mounting portion, a portion of an inner circumferential wall of the mounting portion being a slot wall of the winding slot, the mounting portion having a grounding hole, at least part of the grounding member being located in the grounding hole, and in a radial direction of the electric pump, a minimum distance from a wall forming the grounding hole to an axis of the electric pump is greater than a maximum distance from an inner circumferential wall of the mounting portion to the axis of the electric pump.

[0006] In the above technical solution, the grounding piece is electrically connected to the circuit board, the grounding piece is electrically connected to the stator core, and the stator core contacts the conductive part in the motor housing; the yoke insulating frame includes a mounting portion, part of the inner circumferential wall of the mounting portion is the slot wall of the winding slot, the mounting portion has a grounding hole, at least part of the grounding piece is located in the grounding hole, and in the radial direction of the electric pump, the minimum distance from the wall of the grounding hole to the axis of the electric pump is greater than the maximum distance from the inner circumferential wall of the mounting portion to the axis of the electric pump. The mounting portion for mounting the grounding piece can not occupy the winding space of the winding of the stator assembly, which is conducive to the electric pump having a better slot fill rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a cross-sectional schematic diagram of an embodiment of the electric pump of the present application;

[0008] Figure 2 for Figure 1 Schematic diagram of the connection between the control component and the stator component;

[0009] Figure 3 for Figure 2 Schematic diagram of the AA section;

[0010] Figure 4 for Figure 3 Part B is a schematic diagram of an enlarged embodiment;

[0011] Figure 5 for Figure 3 Part B is an enlarged schematic diagram of another embodiment;

[0012] Figure 6 for Figure 3 Part B is an enlarged schematic diagram of another embodiment;

[0013] Figure 7 This is a cross-sectional schematic diagram of another embodiment of the electric pump of the present application;

[0014] Figure 8 for Figure 7 Schematic diagram of the connection between the middle isolator, control assembly and stator assembly;

[0015] Figure 9 for Figure 7 Schematic diagram of the middle isolation member;

[0016] Figure 10 for Figure 1 Schematic diagram of the stator assembly;

[0017] Figure 11 for Figure 10 Schematic diagram of the stator assembly without the windings;

[0018] Figure 12 is a schematic diagram of an embodiment of a stator core;

[0019] Figure 13 for Figure 12 Schematic diagram of the first stator punching plate;

[0020] Figure 14 for Figure 12 Schematic diagram of the second stator punching.

[0021] Figure numerals: 1, pump housing; 11, motor housing; 12, bottom cover; 13, spacer; 131, positioning column; 14, pump cover; 2, grounding member; 21, main body; 22, first end; 23, second end; 231, first sub-end; 232, second sub-end; 3, conductive member; 4, first rotor assembly; 41, first rotor; 42, second rotor; 5, stator assembly; 51, stator core; 511, core shoe; 512, core yoke; 5121, inner peripheral wall; 5122, outer peripheral wall; 5123, accommodating portion; 5123a, accommodating sub-portion; 5124, upper Surface; 5125, lower surface; 513, core neck; 514, stator punching sheet; 5141, connecting portion; 5142, first stator punching sheet; 5143, second stator punching sheet; 52, winding; 53, insulating frame; 531, grounding hole; 5311, first grounding hole wall; 5312, second grounding hole wall; 532, yoke insulating frame; 5321, positioning portion; 5322, mounting portion; 533, neck insulating frame; 54, winding wire slot; 55, accommodating cavity; 6, second rotor assembly; 7, drive shaft; 8, circuit board; 20, first cavity; 30, second cavity; 40, third cavity. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other technical solutions can be obtained based on these technical solutions without paying any creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts relative to each other shown in the accompanying drawings. They are only for the clarity and convenience of expressing the technical solutions. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0023] Electric pumps can be used in automotive lubrication and / or cooling systems to provide circulating power for the working medium in the automotive lubrication and / or cooling systems, which in turn can provide lubricating and / or cooling oil to the transmission system. In this application, "A and B are fixedly connected" means that there is no relative displacement between A and B after the connection, for example, when A and B are welded together; "A and B are limitedly connected" means that A limits B's movement in a certain direction, or B limits A's movement in a certain direction.

[0024] Please refer to Figure 1 , Figure 1 It is a schematic diagram of an embodiment of an electric pump; the electric pump includes a pump housing 1, the pump housing 1 includes a pump cover 14, a motor housing 11 and a bottom cover 12, the pump cover 14 is fixedly connected to the motor housing 11, for example, the pump cover 14 and the motor housing 11 are connected by screws or bolts, of course, the pump cover 14 and the motor housing 11 can also be connected by other connection methods, such as plug-in, clip-on, etc.; the motor housing 11 is fixedly connected to the bottom cover 12, for example, the motor housing 11 and the bottom cover 12 are connected by screws or bolts, which is conducive to making the disassembly and assembly of the electric pump more convenient. The electric pump includes a first rotor assembly 4, a stator assembly 5, a second rotor assembly 6, a drive shaft 7 and a control assembly. The stator assembly 5 surrounds the second rotor assembly 6 from the radial outside of the second rotor assembly 6. The drive shaft 7 is transmission-connected to the second rotor assembly 6. The electric pump has a first cavity 20 and a second cavity 30. The first cavity 20 is connected to the second cavity 30. The first rotor assembly 4 (or at least part of the first rotor assembly 4) is located in the first cavity 20. At least part of the control assembly, the second rotor assembly 6 (or at least part of the second rotor assembly 6), at least part of the drive shaft 7, and the stator assembly 5 (or at least part of the stator assembly 5) are located in the second cavity 30. The control assembly and the stator assembly 5 are located in the same cavity, which can reduce the size of the electric pump in the axial direction and make the structure compact, thereby reducing the production cost of the electric pump.

[0025] Please refer to Figure 7 , Figure 7 It is a schematic diagram of another embodiment of an electric pump, which includes a pump housing 1. The pump housing 1 includes a pump cover 14, a motor housing 11, a bottom cover 12 and an isolating member 13. The pump cover 14 is fixedly connected to the motor housing 11, the motor housing 11 is fixedly connected to the isolating member 13, and the bottom cover 12 is fixedly connected to the isolating member 13. For example, the motor housing 11, the bottom cover 12 and the isolating member 13 are connected by screws, which facilitates the disassembly and assembly of the electric pump. The electric pump includes a first rotor assembly 4, a stator assembly 5, a second rotor assembly 6, a drive shaft 7 and a control assembly. The stator assembly 5 is electrically connected to the control assembly. The stator assembly 5 surrounds the second rotor assembly 6 from the radial outside of the second rotor assembly 6. The drive shaft 7 is transmission-connected to the second rotor assembly 6. The electric pump has a first cavity 20, a second cavity 30 and a third cavity 40. The first cavity 20 is connected to the second cavity 30, and the second cavity 30 and the third cavity 40 are not connected. The first rotor assembly 4 (or at least part of the first rotor assembly 4) is located in the first cavity 20, the second rotor assembly 6 (or at least part of the second rotor assembly 6), at least part of the drive shaft 7, and the stator assembly 5 (or at least part of the stator assembly 5) are located in the second cavity 30. When the electric pump is working, the first cavity 20 can have a working medium, and at least part of the working medium of the first cavity 20 flows into the second cavity 30. The control assembly is located in the third cavity 40, which is beneficial for the circuit board 8 to be not affected by the working medium.

[0026] Please refer to Figures 1 to 14 The stator assembly 5 includes a stator core 51 and a winding 52. When the electric pump is working, the control component controls the current in the winding 52 of the stator assembly 5 to change according to a predetermined rule, thereby controlling the stator assembly 5 to generate a changing excitation magnetic field. The second rotor assembly 6 rotates under the action of the excitation magnetic field. The second rotor assembly 6 can directly or indirectly drive the first rotor assembly 4 to rotate. In this embodiment, the drive shaft 7 is transmission-connected to the first rotor assembly 4 and the second rotor assembly 6. Specifically, one side of the drive shaft 7 is connected to the second rotor 42, and the other side of the drive shaft 7 is connected to the second rotor assembly 6. The second rotor assembly 6 drives the second rotor 42 to rotate through the drive shaft 7, thereby realizing the rotation of the first rotor assembly 4. Please refer to Figure 2 The first rotor 41 is located on the outer periphery of the second rotor 42. The first rotor 41 and the second rotor 42 are internally meshed. In other embodiments, the first rotor 41 and the second rotor 42 may also be externally meshed. In this case, the first rotor 41 and the second rotor 42 are arranged side by side. In this embodiment, the central axis of the first rotor 41 is offset from the central axis of the second rotor 42. In other words, there is a certain eccentricity between the central axis of the first rotor 41 and the central axis of the second rotor 42. When the second rotor 42 rotates, at least a portion of the external teeth of the second rotor 42 mesh with at least a portion of the internal teeth of the first rotor 41, thereby enabling the second rotor 42 to drive the first rotor 41 to rotate.

[0027] Please refer to Figures 1 to 14The electric pump includes a grounding member 2, and the control assembly includes a circuit board. The grounding member 2 is electrically connected to the circuit board 8, and the grounding member 2 is electrically connected to the stator core 51. The motor housing 11 is at least partially conductive, and the stator core 51 contacts the conductive portion of the motor housing 11. Specifically, the stator core 51 achieves electrical connection by contacting the conductive portion of the motor housing 11. In one embodiment, the motor housing 11 is made of a conductive material, such as a metal material. The stator assembly 5 includes an insulating frame 53, which is fixedly connected to the stator core 51. The insulating frame 53 includes a yoke insulating frame 532 and a neck insulating frame 533. The stator assembly 5 has a winding slot 54, which is located between adjacent neck insulating frames 533. At least part of the winding 52 of the stator assembly is located in the winding slot 54; the yoke insulating frame 532 includes a mounting portion 5322, part of the inner peripheral wall of the mounting portion 5322 is the slot wall of the winding slot 54, and the mounting portion 5322 has a grounding hole 531. At least part of the grounding member 2 is located in the grounding hole 531. In the radial direction of the electric pump, the hole wall of the grounding hole 531 is connected to the electric pump. The minimum distance L1 between the axis o of the mounting portion 5322 and the axis o of the electric pump is greater than the maximum distance L2 between the inner circumferential wall of the mounting portion 5322 and the axis of the electric pump. This means that the minimum distance between the wall forming the grounding hole 531 and the axis of the electric pump is greater than the maximum distance between the inner circumferential wall of the mounting portion 5322 and the axis of the electric pump. This allows the mounting portion for mounting the grounding member to avoid occupying the winding space of the stator assembly, thus ensuring that the stator assembly 5 has a good slot fill rate. The circuit board 8 is electrically connected to the grounding member 2, which is then electrically connected to the stator core 51, and the stator core 51 is electrically connected to the motor housing 11. This implements a grounding design for the circuit board 8 and improves the electromagnetic compatibility of the electric pump. The axis of the electric pump is the axis of the second rotor assembly 6.

[0028] Please refer to Figures 2 to 6 、 Figures 8 to 14The stator core 51 and the insulating frame 53 are fixed by injection molding, and the insulating frame 53 is formed by injection molding with the stator core 51 as an insert. The yoke insulating frame 532 has a grounding hole 531. The grounding hole 531 can be formed when the insulating frame 53 is formed by injection molding with the stator core 51 as an insert. No additional parts are needed to accommodate the grounding piece 2, and the preparation process is simple. The stator core 51 includes a core yoke 512 and a core neck 513. The core neck 513 extends from the core yoke 512 toward the central axis of the stator assembly. The yoke insulating frame 532 covers at least a portion of the core yoke 512, and the neck insulating frame 533 covers at least a portion of the core neck 513. The core yoke 512 has an inner circumferential wall 5121 and an outer circumferential wall 5122. The orthographic projection 531' of the grounding hole 531 on the core yoke 512 is located between the inner circumferential wall 5121 and the outer circumferential wall 5122. That is, in the axial direction of the electric pump, the projection 531' of the grounding hole 531 on the core yoke 512 is located between the inner circumferential wall 5121 and the outer circumferential wall 5122. There is a gap between the grounding hole 531 for accommodating the grounding member 2 and the inner circumferential wall 5121, so that the winding space of the winding 52 is not occupied, which is conducive to making the stator assembly 5 have a better slot fill rate. The stator core 51 includes a core shoe 511 , and a core neck 513 connects the core shoe 511 and the core yoke 512 . In the radial direction of the stator assembly 5 , the core shoe 511 is close to the central axis of the stator core 51 relative to the core yoke 512 .

[0029] The core yoke 512 includes an accommodating portion 5123, which is connected to the grounding hole 531. The wall corresponding to the accommodating portion 5123 is interference fit with the grounding member 2. Part of the grounding member 2 is located in the accommodating portion 5123. In the radial direction of the stator assembly 5, the accommodating portion 5123 is located between the inner circumferential wall 5121 and the outer circumferential wall 5122. There is a distance between the grounding hole 531 for accommodating the grounding member 2 and the inner circumferential wall 5121, which can not occupy the winding space of the winding 52, which is conducive to making the stator assembly 5 have a better slot fill rate. The grounding member 2 includes a main body 21, a first end 22 and a second end 23. Along a direction parallel to the axial direction of the electric pump, the main body 21 is located between the first end 22 and the second end 23. The first end 22 is electrically connected to the circuit board 8. At least a portion of the second end 23 contacts the accommodating portion 5123. The second end 23 includes a first sub-end 231 and a second sub-end 232. Along a direction perpendicular to the axial direction of the electric pump, there is a spacing between the first sub-end 231 and the second sub-end 232. At least a portion of the first sub-end 231 contacts the stator core 51, and at least a portion of the second sub-end 232 contacts the stator core 51. When the grounding piece 2 is inserted into the stator assembly 5, the first sub-end portion 231 and the second sub-end portion 232 have a certain elasticity. The first sub-end portion 231 and the second sub-end portion 232 are squeezed by force and pressed into the stator core 51, which is beneficial to reducing the press-fitting force; in addition, the first sub-end portion 231 and the second sub-end portion 232 can be tightly matched with the stator core 51 when not subjected to force, which is beneficial to increasing the connection strength between the grounding piece 2 and the stator assembly 5, and reducing the risk of the grounding piece 2 falling off due to vibration.

[0030] The stator core 51 includes a plurality of stacked stator punchings 514, which are fixed together by riveting or stamping. The core yoke 512 includes an upper surface 5124 and a lower surface 5125. In one embodiment, please refer to Figure 3 、 Figure 4 and Figures 10 to 14The accommodating portion 5123 is concave from the upper surface 5124 toward the lower surface 5125. The stator punching sheet 514 includes a first stator punching sheet 5142 and a second stator punching sheet 5143. In the axial direction of the electric pump, the second stator punching sheet 5143 is closer to the circuit board 8 relative to the first stator punching sheet 5142. The second stator punching sheet 5143 has an accommodating sub-portion 5123a. The accommodating sub-portion 5123a passes through the upper surface and the lower surface of the second stator punching sheet 5143. The second stator punching sheets 5143 are stacked to form the accommodating portion 5123. The first stator punching sheet 5142 does not have an accommodating sub-portion. The first stator punching sheet 5142 can block an opening of the accommodating portion 5123, with the stator core 51 as an insert. During injection molding, liquid plastic is not easy to flow into the accommodating portion 5123, which is beneficial to increasing the contact area between the grounding piece 2 and the core yoke 512; in one embodiment, the stator core 51 includes a plurality of stacked second stator punchings 5143, the accommodating portion 5123 passes through the upper surface 5124 and the lower surface 5125, the second stator punching 5143 has an accommodating section 5123a, the accommodating section 5123a passes through the upper surface and the lower surface of the second stator punching 5143, and a plurality of second stator punchings 5143 are stacked to form the accommodating portion 5123. The preparation process of each stator punching 514 is the same, which is beneficial to improving the preparation efficiency of the stator core and can also relatively reduce the weight of the stator core.

[0031] Please refer to Figures 2 to 6 The grounding hole 531 has a first grounding hole wall 5311 and a second grounding hole wall 5312. In this embodiment, the mounting portion 5322 includes the first grounding hole wall 5311 and the second grounding hole wall 5312 that define the grounding hole 531. The second grounding hole wall 5312 extends from the first grounding hole wall 5311 toward the stator core 51. In the circumferential direction of the stator assembly 5, the maximum width of the first grounding hole wall 5311 is greater than the width of the second grounding hole wall 5312. When the grounding member 2 is inserted into the grounding hole 531, the first grounding hole wall 5311 serves as a guide, making it easier for the grounding member 2 to be inserted into the grounding hole 531.

[0032] In one embodiment, please refer to Figure 5 The stator assembly 5 includes a accommodating cavity 55, the cavity wall of the accommodating cavity 55 includes the upper surface 5124 of the core yoke 512 and the hole wall of the grounding hole 531, the grounding piece 2 contacts the core yoke 512, and the preparation process of each stator punching sheet 514 is the same, which is beneficial to improving the preparation efficiency of the stator core 51. In addition, the stator core 51 has relatively less leakage magnetic field, which is beneficial to improving the performance of the electric pump.

[0033] In one embodiment, please refer to Figure 6The electric pump also includes a conductive part 3, which contacts the core yoke 512. At least part of the conductive part 3 is located in the grounding hole 531. The grounding part 2 contacts the conductive part 3. By setting the conductive part 3, it is beneficial to ensure the reliability of the electrical connection between the grounding part 2 and the core yoke 512; in addition, the preparation process of each stator punching sheet 514 is the same, which is beneficial to improve the preparation efficiency of the stator core 51; the stator core 51 has relatively less magnetic leakage, which is beneficial to improve the performance of the electric pump.

[0034] Please refer to Figures 10 to 14 The stator punching sheet 514 includes a connecting portion 5141, which connects adjacent stator punching sheets 514. In the circumferential direction of the stator assembly 5, there is a distance between the connecting portion 5141 and the accommodating portion 5123. For example, several stator punching sheets 514 are fixed by riveting to form the stator core 51. The connecting portion 5141 is a rivet point, and there is a distance between the accommodating portion 5123 and the connecting portion 5141, which is beneficial to reducing the deformation of the accommodating portion 5123 after being subjected to force during riveting, so that the grounding member 2 is easily inserted into the accommodating portion 5123.

[0035] Please refer to Figures 7 to 9 The grounding member 2 is welded and fixed to the isolating member 13; or the grounding member 2 is used as an insert for injection molding to form the isolating member 13, and the isolating member 13 is fixedly connected to the motor housing 11. The yoke insulating frame 532 includes a positioning portion 5321. In the circumferential direction of the stator assembly 5, the mounting portion 5322 is located between adjacent positioning portions 5321. When the isolating member 13 is installed, in the axial direction of the electric pump, the positioning portion 5321 is close to the circuit board 8 relative to the mounting portion 5322. The positioning column 131 of the isolating member 13 is inserted into the positioning portion 5321 before the grounding member 2 is inserted into the grounding hole 531. The positioning column 131 cooperates with the positioning portion 5321 to perform pre-positioning, which is conducive to the accurate insertion of the grounding member 2 into the grounding hole 531. Please refer to Figures 1 to 3 、 Figures 10 and 11 The yoke insulating frame 532 includes a positioning portion 5321, which is clearance-matched with the circuit board 8. When assembling the circuit board, the positioning portion 5321 is first inserted into the hole of the circuit board 8 before the grounding piece 2 is inserted into the grounding hole 531. The hole and the positioning portion 5321 cooperate to perform pre-positioning, which is conducive to the accurate insertion of the grounding piece 2 into the grounding hole 531.

[0036] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and variations without departing from the scope of the present application, and all such modifications and variations fall within the scope of protection of the present application.

Claims

1. An electric pump, characterized in that: The electric pump comprises a stator assembly (5), the stator assembly (5) comprising a stator core (51) and an insulating frame (53), the insulating frame (53) being fixedly connected to the stator core (51), the insulating frame (53) comprising a yoke insulating frame (532) and a neck insulating frame (533), the stator assembly (5) having winding slots (54), the winding slots (54) being located between adjacent neck insulating frames (533), and at least part of the winding (52) of the stator assembly (5) being located in the winding slots (54); the electric pump comprises a circuit board (8) and a motor housing (11), the electric pump comprises a grounding member (2), the grounding member (2) being electrically connected to the circuit board (8) The grounding member (2) is electrically connected to the stator core (51), and the stator core (51) contacts the conductive part of the motor housing (11); the yoke insulating frame (532) includes a mounting portion (5322), a portion of the inner peripheral wall of the mounting portion (5322) is the slot wall of the winding wire slot (54), the mounting portion (5322) has a grounding hole (531), at least a portion of the grounding member (2) is located in the grounding hole (531), and in the radial direction of the electric pump, the minimum distance (L1) from the wall surface of the grounding hole (531) to the axis of the electric pump is greater than the maximum distance (L2) from the inner peripheral wall surface of the mounting portion (5322) to the axis of the electric pump.

2. The electric pump according to claim 1, characterized in that The stator core (51) is fixed to the insulating frame (53) by injection molding. The stator core (51) includes a core yoke (512) and a core neck (513). The core neck (513) extends from the core yoke (512) toward the central axis of the stator assembly (5). The yoke insulating frame (532) covers at least a portion of the core yoke (512). The neck insulating frame (533) covers at least a portion of the core neck (513). The core yoke (512) has an inner circumferential wall (5121) and an outer circumferential wall (5122). In the axial direction of the electric pump, the projection of the grounding hole (531) on the core yoke (512) is located between the inner circumferential wall (5121) and the outer circumferential wall (5122).

3. The electric pump according to claim 2, characterized in that The core yoke portion (512) includes a receiving portion (5123), the receiving portion (5123) is connected to the grounding hole (531), part of the grounding member (2) is located in the receiving portion (5123), and in the radial direction of the stator assembly (5), the receiving portion (5123) is located between the inner peripheral wall (5121) and the outer peripheral wall (5122).

4. The electric pump according to claim 3, characterized in that The core yoke (512) includes an upper surface (5124) and a lower surface (5125), and the accommodating portion (5123) is concave from the upper surface (5124) toward the lower surface (5125); or the accommodating portion (5123) passes through the upper surface (5124) and the lower surface (5125).

5. The electric pump according to claim 3, characterized in that The grounding member (2) includes a main body (21), a first end (22) and a second end (23); along a direction parallel to the axial direction of the electric pump, the main body (21) is located between the first end (22) and the second end (23); the second end (23) includes a first branch end (231) and a second branch end (232); along a direction perpendicular to the axial direction of the electric pump, there is a spacing between the first branch end (231) and the second branch end (232); at least a portion of the first branch end (231) contacts the iron core yoke (512), and at least a portion of the second branch end (232) contacts the iron core yoke (512).

6. The electric pump according to claim 4, characterized in that The grounding member (2) includes a main body (21), a first end (22) and a second end (23); along a direction parallel to the axial direction of the electric pump, the main body (21) is located between the first end (22) and the second end (23); the second end (23) includes a first branch end (231) and a second branch end (232); along a direction perpendicular to the axial direction of the electric pump, there is a spacing between the first branch end (231) and the second branch end (232); at least a portion of the first branch end (231) contacts the iron core yoke (512), and at least a portion of the second branch end (232) contacts the iron core yoke (512).

7. The electric pump according to claim 1, characterized in that The stator assembly (5) includes a housing cavity (55), the stator core (51) includes a core yoke (512), the cavity wall of the housing cavity (55) includes a portion of the upper surface (5124) of the core yoke (512) and the hole wall of the grounding hole (531), the yoke insulation frame (532) is interference-fitted with the grounding member (2), and the grounding member (2) contacts the core yoke (512).

8. The electric pump according to claim 2, characterized in that The stator assembly (5) includes a housing cavity (55), the cavity wall of the housing cavity (55) includes a portion of the upper surface (5124) of the core yoke (512) and the hole wall of the grounding hole (531), the yoke insulation frame (532) is interference-fitted with the grounding member (2), and the grounding member (2) contacts the core yoke (512).

9. The electric pump according to claim 1, characterized in that The stator core (51) includes a core yoke (512), and the electric pump further includes a conductive member (3), wherein the conductive member (3) contacts the core yoke (512), at least a portion of the conductive member (3) is located in the grounding hole (531), and the grounding member (2) contacts the conductive member (3).

10. The electric pump according to claim 2, characterized in that The electric pump further comprises a conductive member (3), the conductive member (3) contacts the iron core yoke (512), at least a portion of the conductive member (3) is located in the grounding hole (531), and the grounding member (2) contacts the conductive member (3).

11. The electric pump according to any one of claims 1 to 10, characterized in that: The mounting portion (5322) includes a first grounding hole wall (5311) and a second grounding hole wall (5312) defining the grounding hole (531), wherein the second grounding hole wall (5312) extends from the first grounding hole wall (5311) toward the stator core (51), and in the circumferential direction of the stator assembly (5), the maximum width of the first grounding hole wall (5311) is greater than the width of the second grounding hole wall (5312).

12. The electric pump according to any one of claims 3 to 6, characterized in that: The stator core (51) includes at least two stator punching sheets (514), and the stator punching sheets (514) include a connecting portion (5141). The connecting portion (5141) connects adjacent stator punching sheets (514), and in the circumferential direction of the stator assembly (5), there is a spacing between the connecting portion (5141) and the accommodating portion (5123).

13. The electric pump according to any one of claims 1 to 10, characterized in that: The yoke insulating frame (532) includes a positioning portion (5321), and the positioning portion (5321) is loosely fitted with the circuit board (8); or the electric pump includes an isolating member (13), and the grounding member (2) is welded and fixed to the isolating member (13), or the isolating member (13) is formed by injection molding with the grounding member (2) as an insert, and the isolating member (13) is fixedly connected to the motor housing (11), and the isolating member (13) includes a positioning column (131), and the positioning column (131) is loosely fitted with the positioning portion (5321); in the circumferential direction of the stator assembly (5), the mounting portion (5322) is located between adjacent positioning portions (5321).

14. The electric pump according to claim 11, characterized in that The yoke insulating frame (532) includes a positioning portion (5321), and the positioning portion (5321) is clearance-matched with the circuit board (8); or, The electric pump includes an isolating member (13), the grounding member (2) is welded and fixed to the isolating member (13), or the isolating member (13) is formed by injection molding with the grounding member (2) as an insert, the isolating member (13) is fixedly connected to the motor housing (11), and the isolating member (13) includes a positioning column (131), and the positioning column (131) is clearance-fitted with the positioning portion (5321); in the circumferential direction of the stator assembly (5), the mounting portion (5322) is located between adjacent positioning portions (5321).

15. The electric pump according to claim 12, characterized in that The yoke insulating frame (532) includes a positioning portion (5321), and the positioning portion (5321) is clearance-matched with the circuit board (8); or, The electric pump includes an isolating member (13), the grounding member (2) is welded and fixed to the isolating member (13), or the isolating member (13) is formed by injection molding with the grounding member (2) as an insert, the isolating member (13) is fixedly connected to the motor housing (11), and the isolating member (13) includes a positioning column (131), and the positioning column (131) is clearance-fitted with the positioning portion (5321); in the circumferential direction of the stator assembly (5), the mounting portion (5322) is located between adjacent positioning portions (5321).

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