Electric pump

Abstract

The utility model provides an electric pump which comprises a stator assembly, the stator assembly comprises an insulating framework and a winding group, the insulating framework comprises a plurality of supporting parts, the winding group comprises at least three windings, each winding comprises at least two winding parts and a bridging wire part, the winding parts are wound on the supporting parts, and the bridging wire part is wound on the supporting parts. The two winding parts are defined as a first winding part and a second winding part, the gap bridge wire part is connected with the first winding part and the second winding part, the gap bridge wire part of one of the three windings and the gap bridge wire parts of the other two windings are located on different sides of the stator assembly, and the stator assembly comprises a plurality of wire passing grooves. And the total sectional areas of the conductors of the partial winding parts in the wire passing grooves are the same. When the total conductor sectional area in each wire passing groove is ensured to be the same, the bridging wires of different phases are separately arranged at the two ends of the stator assembly, so that the length of the stator assembly in the axial direction can be reduced.

Description

Technical Field

[0001] The present application relates to the field of thermal management, and in particular to an electric pump for automotive, energy storage, or commercial use. Background Art

[0002] The winding group of the electric pump is wound on the insulating frame. Usually the winding group includes at least three windings, and each winding usually includes at least two winding parts. The winding parts are connected through a bridge wire part, and the bridge wire part is arranged at one end of the insulating frame. In the existing technology, the total cross-sectional area of ​​the conductors in the wire slot is the same, and the bridge wire part is arranged at one end of the insulating frame. In this way, the axial height of the stator assembly is not conducive to miniaturization. Utility Model Content

[0003] The object of the present application is to provide an electric pump that is conducive to reducing the axial length of a stator assembly while ensuring that the total cross-sectional area of ​​the conductors in each slot is the same.

[0004] To achieve the above-mentioned purpose, a technical solution of the present application is as follows: an electric pump, the electric pump includes a stator assembly, the stator assembly includes an insulating frame and a winding group, the insulating frame includes multiple support parts, the winding group includes at least three windings, the winding includes at least two winding parts and a bridge wire part, the winding part is wound around the support part, the two winding parts are defined as a first winding part and a second winding part, the bridge wire part connects the first winding part and the second winding part, the bridge wire part of one of the three windings is located on a different side of the stator assembly from the bridge wire parts of the other two windings, the insulating frame includes multiple wire slots, and the total cross-sectional area of ​​the conductors of the partial winding parts located in the wire slots is the same.

[0005] In this application's technical solution, the bridge conductors of one of the three windings are located on different sides of the stator assembly from the bridge conductors of the other two windings. The insulating framework includes multiple wire slots, and the conductors of the winding sections located within the slots have the same total cross-sectional area. This ensures that the effective conductor cross-sectional area within each slot is the same, while separating the bridge conductors of different phases at both ends of the stator assembly. This helps reduce the axial length of the stator assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a three-dimensional schematic diagram of a technical solution of the electric pump of the present application.

[0007] Figure 2 yes Figure 1 Schematic diagram of the structure along the AA section.

[0008] Figure 3 yes Figure 2 Schematic diagram of the three-dimensional structure of the stator winding in one direction.

[0009] Figure 4 yes Figure 3 Schematic diagram of the front view of the stator winding along the C direction.

[0010] Figure 5 yes Figure 3 Schematic diagram of the front view structure of the stator winding along direction B.

[0011] Figure 6 yes Figure 3 Schematic diagram of the winding expansion structure of the stator winding.

[0012] Figure 7 yes Figure 4 Schematic diagram of the structure after removing the stator winding.

[0013] Figure 8 yes Figure 4 Schematic diagram of the three-dimensional structure in one direction after the stator winding is removed.

[0014] Figure 9 yes Figure 2 Schematic diagram of the forward projection structure of the support part and lead slot in the stator winding onto the first reference plane.

[0015] Figure 10 yes Figure 2 Schematic diagram of the three-dimensional structure of the stator core in one direction.

[0016] Figure 11 yes Figure 7 The enlarged structural diagram at point I is shown in the figure.

[0017] Figure 12 yes Figure 2 Schematic diagram of the three-dimensional structure of another technical solution of the stator winding in one direction. Description of the drawings:

[0019] 100, electric pump; 11, pump cover; 111, inlet; 112, outlet;

[0020] 12. stator assembly; 121. stator housing; 1211. first housing; 1212. second housing;

[0021] 122, stator winding; 1222, insulating frame; 1222a, support portion; 1222b, sub-support portion; 1222f, first side portion; 1222g, second side portion; 1222c, first support portion; 1222d, second support portion; 1222e, third support portion; 1222h, first stop portion; 1222i, outer wall portion; 1222k, upper end portion of the first stop portion; 1222j, second stop portion; 1222m, positioning portion; 1222n, limiting groove; 1222p, first positioning portion; 1222q, second positioning portion; 1222w, third positioning portion;

[0022] 1221, stator core; 1221a, tooth portion; 1221b, yoke portion; 1221c, shoe portion;

[0023] 1223, winding group; 1223a, winding; 1223b, winding portion; 1223h, first winding portion; 1223i, second winding portion; 1223c, bridge wire portion; 1223d, electrical connection portion; 1223e, incoming line segment; 1223f, outgoing line segment; 1223m, first winding; 1223n, second winding; 1223p, first connecting portion; 1223q, first compensation portion; 1223w, Third winding; 1223s, second connecting portion; 1223t, second compensating portion; 1224, wire slot; 1224a, first wire slot; 1224b, second wire slot; 1225, lead slot; 1225a, sub-lead slot; 1225b, first contact portion; 1225c, second contact portion; 1226, limit portion; 1226a, upper end portion of the limit portion; 1227, protective portion; 1228, disconnect slot;

[0024] 13. Inner cavity; 131. Rotor cavity; 132. Impeller cavity; 14. Rotating assembly; 141. Rotor assembly; 142. Impeller assembly; 16. Shaft; 19. Control panel assembly; 101. First reference plane DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and specific technical solutions:

[0026] The specific technical solutions of this application are further described in detail below with reference to the accompanying drawings. First, it should be noted that directional terms such as "up," "down," "left," "right," "front," "rear," "inside," "outside," "top," and "bottom" mentioned or potentially mentioned in this specification are defined relative to the structures shown in the corresponding drawings. These are relative concepts and may vary depending on the location and usage of the device. Therefore, these or other directional terms should not be interpreted as restrictive.

[0027] See also Figures 1 to 12As shown, the present application provides an electric pump 100, which includes a pump cover 11, a stator assembly 12, a rotating assembly 14, and a shaft 16. The stator assembly 12 includes a stator winding 122 and a stator housing 121. The stator winding 122 includes a stator core 1221, an insulating frame 1222, and a winding assembly 1223. The pump cover 11 is sealed and fixedly connected to the stator assembly 12. It should be noted that the sealing and fixing here means that when the electric pump 100 is in operation, the working medium in the electric pump 100 will not leak to the outside of the electric pump 100 through the joint surface between the pump cover 11 and the stator assembly 12. The shaft 16 is fixedly connected to the stator assembly 12. Specifically, the shaft 16 is fixed to the stator housing 121 by injection molding. It is understood that a portion of the shaft 16 is embedded in the stator housing 121. The electric pump 100 has an inner cavity 13, and the rotating assembly 14 is located in the inner cavity 13. The inner cavity 13 includes a rotor cavity 131 and an impeller cavity 132, and the rotor cavity 131 and the impeller cavity 132 are connected. The inner cavity 13 can allow the flow of working medium. The rotating assembly 14 includes a rotor assembly 141 and an impeller assembly 142. The rotor assembly 141 includes a permanent magnet. At least a portion of the rotor assembly 141 is located in the rotor cavity 131, and the impeller assembly 142 is located in the impeller cavity 132. In a specific embodiment, the other end of the shaft 16 is at least partially located in the rotor cavity 131, at least a portion of the rotating assembly 14 is sleeved on the outer circumference of the shaft 16, and a portion of the shaft 16 is fixed to the stator housing 121. The rotating assembly 14 can rotate around the shaft 16. Of course, in other embodiments, the rotating assembly 14 and the shaft 16 are fixedly connected, and the shaft 16 rotates with the rotating assembly 14. The electric pump 100 may also include a control board assembly 19, which is electrically connected to the stator assembly 12. In other embodiments, the electric pump 100 may not include the control board assembly 19, and the control board assembly 19 may be integrated into the external structure, which facilitates the miniaturization of the electric pump 100. In this embodiment, the electric pump 100 includes the control board assembly 19. The pump cover 11 has an inlet 111 and an outlet 112. The inlet 111 is used for the working medium to flow into the electric pump 100, and the outlet 112 is used for the working medium to flow out of the electric pump 100. When the electric pump 100 is working, the electric pump 100 is connected to an external power supply, and the excitation magnetic field generated by the stator winding 122 is controlled by controlling the current of the stator winding 122. The rotating component 14 rotates around the axis 16 under the action of the excitation magnetic field, so that the working medium entering the inner cavity 13 through the inlet 111 rotates along with the rotating component 14. The working medium will leave the electric pump 100 through the outlet 112 under the action of centrifugal force. It should be noted that the axial direction of the electric pump 100 described below is the direction in which the axis of the electric pump extends, and the radial direction of the electric pump is the direction perpendicular to the axial direction of the electric pump.The circumferential direction of the electric pump is the direction of one circumferential rotation of the electric pump, the axial direction of the stator assembly is parallel to the axial direction of the electric pump, the radial direction of the stator assembly is parallel to the radial direction of the electric pump, and the circumferential direction of the stator assembly is the direction of one circumferential circle of the stator assembly.

[0028] See also Figure 3 As shown, the stator winding 122 includes a stator core 1221, an insulating frame 1222 and a winding group 1223. The number of the winding groups 1223 is at least three. The insulating frame 1222 is coated on at least part of the surface of the stator core 1221. The insulating frame 1222 is used to isolate the winding 1223 from the stator core 1221, so that the winding 1223 and the stator core 1221 are electrically insulated. The insulating frame 1222 and the stator core 1221 can be an integral structural component. Specifically, as an implementation method, the insulating frame 1222 is formed by injection molding with the stator core 1221 as an insert. Of course, as other implementation methods, the insulating frame 1222 and the stator core 1221 are separately set. Here, "separate setting" means that the insulating frame 1222 and the stator core 1221 are respectively processed into two separate parts and then assembled. The connection is limited or fixed by assembly. In this embodiment, the insulating frame 1222 is formed by injection molding with the stator core 1221 as an insert. It will be appreciated that the stator core 1221 and the insulating frame 1222 form an integrated structure. The windings 1223 are wound around the insulating frame 1222. In one specific embodiment, the windings 1223 include nine windings 1223. Of course, in other embodiments, the windings 1223 may include other numbers of windings 1223, such as three, six, or twelve.

[0029] At present, the bridge wire parts of ordinary stator assemblies on the market are all located on the same side of the stator core in the axial direction, and the number of conductors in the stator assembly's wire slots is inconsistent, resulting in different total cross-sectional areas of the conductors in each wire slot, which easily leads to uneven distribution of the motor's magnetomotive force, and further causes other NVH (noise, vibration, and harshness) problems. Since the bridge wire parts of the above design are all located on the same side of the stator core, it is not conducive to the miniaturization of the stator assembly in the axial direction.

[0030] As an implementation, please refer to Figures 1 to 12As shown, an electric pump 100 includes a stator assembly 12, the stator assembly 12 includes an insulating frame 1222 and a winding group 1223, the insulating frame 1222 includes a plurality of support portions 1222a, the winding group 1223 includes at least three windings 1223a, the winding 1223a includes at least two winding portions 1223b and a bridge wire portion 1223c, the winding portion 1223b is wound around the support portion 1222a, and the two winding portions 1223b are defined as the first winding portion 1223c. 223h and the second winding portion 1223i, a bridge portion 1223c connects the first winding portion 1223h and the second winding portion 1223i, and the bridge portion 1223c of one of the three windings 1223a is located on a different side of the stator assembly 12 than the bridge portions 1223c of the other two windings 1223a. The insulating frame 1222 includes a plurality of wire slots 1224, and the partial winding portions 1223b located within the wire slots 1224 have the same total effective conductor cross-sectional area. In this way, the bridge portion 1223c of one of the three windings 1223a is located on a different side of the stator assembly 12 than the bridge portions 1223c of the other two windings 1223a. The insulating frame 1222 includes a plurality of wire slots 1224, and the partial winding portions 1223b located within the wire slots 1224 have the same total conductor cross-sectional area. In this way, while ensuring that the total cross-sectional area of ​​the conductors in each wire slot 1224 is the same, the bridge wires of different phases are arranged separately at both ends of the stator assembly 12. This helps to reduce the axial length of the stator assembly 12. It should be noted that the total cross-sectional area of ​​the conductors in the wire slot 1224 is the sum of the cross-sectional areas of all individual conductors located in the wire slot 1224. It should be noted that certain manufacturing tolerances exist during the manufacturing process of conductors. "The total cross-sectional area of ​​the conductors is the same" means that the total cross-sectional area of ​​the conductors is the same within the range allowed by the preset manufacturing tolerances.

[0031] As an implementation, please refer to Figures 3 to 10As shown, the winding group 1223 includes three windings 1223a, which are defined as a first winding 1223m, a second winding 1223n and a third winding 1223w. The winding 1223a includes an electrical connection portion 1223d, which is used to electrically connect to an external power supply or a pin portion. The bridge line portion 1223c of the first winding 1223m is on the same side as the electrical connection portion 1223d, and the bridge line portion 1223c of the second winding 1223n and the bridge line portion 1223c of the third winding 1223w are on opposite sides of the electrical connection portion 1223d. In this way, the bridge wire portion 1223c of the first winding 1223m is on the same side as the electrical connection portion 1223d, and the bridge wire portion 1223c of the second winding 1223n and the bridge wire portion 1223c of the third winding 1223w are on different sides from the electrical connection portion 1223d. The bridge wire portions 1223c of different phases are arranged separately, and the bridge wire portion 1223c and the electrical connection portion 1223d at the end of the stator winding 122 are arranged in a comprehensive manner, which is more conducive to miniaturization of the stator assembly in the axial direction.

[0032] As an implementation, please refer to Figures 3 to 10 The winding 1223a shown includes an incoming line segment 1223e and an outgoing line segment 1223f. The incoming line segment 1223e of the first winding 1223m and the outgoing line segment 1223f of the first winding 1223m are on the same side as the bridge line portion 1223c of the first winding 1223m. The incoming line segment 1223e of the second winding 1223n and the outgoing line segment 1223f of the second winding 1223n are on opposite sides. The outgoing line segment 1223f of the second winding 1223n and the bridge line portion 1223c of the first winding 1223m are on the same side as the bridge line portion 1223c of the first winding 1223m. On the same side as the bridge portion 1223c of group 1223n, the second winding 1223n includes a first connecting portion 1223p and a first compensating portion 1223q. The first connecting portion 1223p is connected to the outgoing wire segment 1223f of the second winding 1223n and is on the same side as the bridge portion 1223c of the second winding 1223n. The first compensating portion 1223q passes through the wire slot 1224 and exits on the same side as the electrical connecting portion 1223d. In this manner, after exiting, the first compensating portion 1223q merges with the incoming wire segment 1223e of the first winding 1223m and is then electrically connected to an external pin portion. This facilitates simplifying the end wire routing structure of the stator assembly 12 while ensuring that the effective total cross-sectional area of ​​the conductors within each wire slot 1224 is the same.

[0033] As an implementation, please refer to Figures 3 to 10The support portion 1222a where the first winding 1223m starts to be wound is defined as the first support portion 1222c, the support portion 1222a where the second winding 1223n starts to be wound is the second support portion 1222d, the support portion 1222a where the third winding 1223w starts to be wound is the third support portion 1222e, the wire groove 1224 between the first support portion 1222c and the second support portion 1222d is the first wire groove 1224a, the wire groove 1224 between the second support portion 1222d and the third support portion 1222e is the second wire groove 1224b, and part of the first compensation portion 1223q is located in the first wire groove 1224a and is led out from the first wire groove 1224a. In this way, the end of the stator winding 122 on the opposite side of the electrical connection portion 1223d is provided with only two layers of bridge wire portions 1223c, which is conducive to simplifying the end winding of the stator assembly.

[0034] As an implementation, please refer to Figures 3 to 10 As shown, the outgoing wire segment 1223f of the third winding 1223w is on the same side as the bridge portion 1223c of the third winding 1223w. The third winding 1223w includes a second connecting portion 1223s and a second compensating portion 1223t. The second connecting portion 1223s is connected to the outgoing wire segment 1223f of the third winding 1223w and is on the same side as the bridge portion 1223c of the third winding 1223w. The second compensating portion 1223t passes through the wire slot 1224 and is led out on the same side as the electrical connecting portion 1223d. This facilitates the simplification of the end wire routing structure of the stator assembly 12 while ensuring that the effective cross-sectional area of ​​the conductors in each wire slot 1224 is the same. Furthermore, this facilitates the simplification of the end wire routing structure of the stator assembly 12 while ensuring that the total effective cross-sectional area of ​​the conductors in each wire slot 1224 is the same.

[0035] As an implementation, please refer to Figures 3 to 10 As shown, the support portion 1222a where the third winding 1223w begins winding is defined as the third support portion 1222e, the wire slot 1224 between the second support portion 1222d and the third support portion 1222e is defined as the second wire slot 1224b, and a portion of the second compensation portion 1223t is located in the second wire slot 1224 and leads out of the second wire slot 1224b. This helps simplify the wire routing structure at the end of the stator assembly 12.

[0036] As an implementation, please refer to Figures 3 to 10As shown, the windings of the second winding 1223n and the third winding 1223w are formed by winding the same uncut wire. The second compensating portion 1223t of the third winding 1223w is directly connected to the incoming wire segment 1223e of the second winding 1223n, and the first compensating portion 1223q of the second winding 1223n is directly connected to the incoming wire segment 1223e of the first winding 1223m. This facilitates the arrangement of the end wires of the stator assembly 12. The electrical connections between the first, second, and third windings do not require welding, which facilitates the manufacturing and processing of the stator assembly.

[0037] As an implementation, please refer to Figures 3 to 10 As shown, the insulating skeleton 1222 includes a positioning portion 1222m, which is located radially outside the support portion 1222a along the radial direction of the electric pump. There are multiple positioning portions 1222m, and the number of positioning portions 1222m matches the number of windings 1223a. The positioning portion 1222m includes a limiting groove 1222n, and the limiting groove 1222n passes through the positioning portion 1222m along the radial direction of the electric pump 100. The positioning portions 1222m include three, namely, a first positioning portion 1222p, a second positioning portion 1222q, and a third positioning portion 1222w. A portion of the first winding 1223m's incoming wire segment 1223e and a portion of the first compensating portion 1223q are located within the limiting portion of the first positioning portion 1222p. A portion of the second winding 1223n's incoming wire segment 1223e is located within the limiting groove 1222n of the second limiting portion. A portion of the third winding 1223w's incoming wire segment 1223e and a portion of the second compensating portion 1223t are located within the limiting portion of the third positioning portion 1222w. This facilitates the manufacturing and processing of the stator assembly 12.

[0038] As an implementation, please refer to Figures 3 to 10 As shown, the stator assembly 12 is orthographically projected along the direction of the electrical connection portion 1223d. The multiple winding portions 1223b of the first winding 1223m are sequentially wound in a clockwise direction of the stator assembly 12, while the multiple winding portions 1223b of the second winding 1223n are sequentially wound in a counterclockwise direction of the stator assembly 12. This method is beneficial in reducing the length of the bridge wire portion 1223c of the first winding 1223m, thereby reducing the manufacturing cost of the stator assembly 12.

[0039] As a specific embodiment, please refer to the figure. The insulating frame 1222 includes a support portion 1222a, a first stop portion 1222h, and a second stop portion 1222j. The support portion 1222a connects the first stop portion 1222h and the second stop portion 1222j. Along the radial direction of the stator assembly 12, the first stop portion 1222h is farther away from the axis of the stator assembly 12 than the second stop portion 1222j. The stator core 1221 includes a tooth portion 1221a, a yoke portion 1221b, and a shoe portion 1221c. The first stop portion 1222h is fixed to the yoke portion 1221b by injection molding. The support portion 1222a covers the tooth portion 1221a. The second stop portion 1222j is fixed to the yoke portion 1221b by injection molding. The insulating frame 1222 includes a wire guide slot 1225. The wire guide slot 1225 is recessed into the upper end of the first stop portion 1222h in the axial direction of the stator assembly 12 and extends radially through the first stop portion 1222h. The wire guide slot 1225 is located radially outward of the tooth portion 1221a. The circumferential width of the tooth portion 1221a is smaller than the circumferential width of the wire guide slot 1225 in the circumferential direction of the stator assembly 12. A first reference plane 101 is defined as a plane perpendicular to the axial direction of the stator assembly 12. The projections 1222a' of the support portion 1222a and the wire guide slot 1225 on the first reference plane 101 extend radially into the projections 1225' of the wire guide slot 1225. In this way, the wire input end of the winding portion 1223 b and the wire output end of the winding portion 1223 b can be directly led out through the lead slot 1225 , which is beneficial for simplifying the winding arrangement of the stator assembly 12 .

[0040] Further, as an implementation method, please refer to Figures 3 to 12 As shown, the support portion 1222a includes a plurality of sub-support portions 1222b, the lead slot 1225 includes a plurality of sub-lead slots 1225a, the sub-support portion 1222b includes a first side portion 1222f and a second side portion 1222g. Specifically, the first side portion 1222f and the second side portion 1222g respectively cover the two side surfaces of the tooth portion 1221a, and the wall portion corresponding to the sub-lead slot 1225a includes a first contact portion 1225b and a second contact portion 1225c. Along the circumferential direction of the stator assembly 12, the first side portion 1222f is close to the first contact portion 1225b relative to the second side portion 1222g, and the second side portion 1222g is close to the second contact portion 1225c relative to the first side portion 1222f. The minimum distance between the first contact portion 1225b and the first side portion 1222f is less than the wire diameter of the winding, and the first side portion 1222f is the incoming side of the winding. In this way, it is helpful to limit the incoming wire end of the winding portion 1223b, so that the incoming wire end of the winding portion 1223b is not easy to fall off.

[0041] As an implementation, please refer to Figures 3 to 12 As shown, to reduce the risk of the bridge wire portion 1223c detaching from the stator assembly 12, the stator assembly 12 includes a plurality of stoppers 1226, the number of which matches the number of wire slots 1224. The stator assembly 12 includes wire slots 1224. The stoppers 1226 correspond to the positions of the wire slots 1224 along the circumferential direction of the stator assembly 12. Specifically, the stoppers 1226 are located radially outward of the wire slots 1224 along the radial direction of the stator assembly 12. The stoppers 1226 protrude from the outer wall portion 1222i of the first stop portion 1222h in a direction away from the outer wall portion 1222i along the radial direction of the stator assembly 12. To simplify the injection mold of the insulating frame 1222, the upper end portion 1226a of the stopper 1226 is flush with the upper end portion of the first stop portion 1222h.

[0042] As an implementation, please refer to Figures 3 to 12 As shown, in order to reduce the contact between the bridge wire portion 1223c and the yoke portion 1221b, the stator assembly 12 includes a protective portion 1227, which is protruding from the outer wall portion 1222i of the first stop portion 1222h. The protective portion 1227 is arranged close to the yoke portion 1221b. As a specific embodiment, the protective portion 1227 is fixed to the yoke portion 1221b by injection molding. The protective portion 1227 can be arranged along the circumference of the stator assembly 12, which is beneficial to increase the structural strength of the insulating skeleton 1222. Of course, the stator assembly 12 includes a disconnecting groove 1228, which passes through the protective portion 1227 along the axial direction of the stator assembly 12. In this way, it is beneficial to achieve a lightweight design of the stator assembly 12. As a specific implementation method, the number of disconnecting grooves 1228 is multiple.

[0043] The above-described technical solutions merely represent several implementations of the present invention. 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 devise various modifications without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. An electric pump (100), characterized in that: The electric pump (100) includes a stator assembly (12), the stator assembly (12) includes an insulating frame (1222) and a winding group (1223), the insulating frame (1222) includes a plurality of support portions (1222a), the winding group (1223) includes at least three windings (1223a), the winding (1223a) includes at least two winding portions (1223b) and a bridge wire portion (1223c), the winding portion (1223b) is wound around the support portion (1222a), and the two winding portions (1223b) are defined as a first winding portion (1223c). 3h) and a second winding portion (1223i), the bridge wire portion (1223c) connects the first winding portion (1223h) and the second winding portion (1223i), the bridge wire portion (1223c) of one of the three windings (1223a) and the bridge wire portions (1223c) of the other two windings (1223a) are located on different sides of the stator assembly (12), the insulating frame (1222) includes a plurality of wire slots (1224), and the conductor total cross-sectional area of ​​the partial winding portion (1223b) located in the wire slots (1224) is the same.

2. The electric pump (100) according to claim 1, characterized in that: The winding group (1223) includes three windings, which are defined as a first winding (1223m), a second winding (1223n) and a third winding (1223w). The winding (1223a) includes an electrical connection portion (1223d), and the electrical connection portion (1223d) is used to electrically connect to an external power supply or a pin portion. The bridge wire portion (1223c) of the first winding (1223m) is on the same side as the electrical connection portion (1223d), and the bridge wire portion (1223c) of the second winding (1223n) and the bridge wire portion (1223c) of the third winding (1223w) are both on different sides from the electrical connection portion (1223d).

3. The electric pump (100) according to claim 2, characterized in that The winding (1223a) includes an incoming line segment (1223e) and an outgoing line segment (1223f); the incoming line segment (1223e) of the first winding (1223m) and the outgoing line segment (1223f) of the first winding (1223m) are on the same side as the bridge line portion (1223c) of the first winding (1223m); the incoming line segment (1223e) of the second winding (1223n) and the outgoing line segment (1223f) of the second winding (1223n) are on different sides; the outgoing line segment (1223f) of the second winding (1223n) is on the same side as the bridge line portion (1223c) of the first winding (1223m); The second winding (1223n) is on the same side as the bridge line portion (1223c), and the second winding (1223n) includes a first connecting portion (1223p) and a first compensating portion (1223q). The first connecting portion (1223p) is connected to the outgoing line segment (1223f) of the second winding (1223n). The first connecting portion (1223p) is on the same side as the bridge line portion (1223c) of the second winding (1223n). The first compensating portion (1223q) passes through the wire slot (1224) and is led out on the same side as the electrical connecting portion (1223d).

4. The electric pump (100) according to claim 3, characterized in that The support portion (1222a) at which the first winding (1223m) starts to be wound is defined as the first support portion (1222c), the support portion (1222a) at which the second winding (1223n) starts to be wound is defined as the second support portion (1222d), the support portion at which the third winding (1223w) starts to be wound is defined as the third support portion (1222e), the wire groove between the first support portion (1222c) and the second support portion (1222d) is defined as the first wire groove (1224a), the wire groove between the second support portion (1222d) and the third support portion (1222e) is defined as the second wire groove (1224b), and the portion of the first compensation portion (1223q) is located in the first wire groove (1224a) and is led out from the first wire groove (1224a).

5. The electric pump (100) according to claim 3, characterized in that: The outgoing line segment (1223f) of the third winding (1223w) is on the same side as the bridge line portion (1223c) of the third winding (1223w); the third winding (1223w) includes a second connecting portion (1223s) and a second compensating portion (1223t); the second connecting portion (1223s) is connected to the outgoing line segment (1223f) of the third winding (1223w); the second connecting portion (1223s) is on the same side as the bridge line portion (1223c) of the third winding (1223w); and the second compensating portion (1223t) passes through the wire slot (1224) and is led out on the same side as the electrical connecting portion (1223d).

6. The electric pump (100) according to claim 4, characterized in that: The outgoing line segment (1223f) of the third winding (1223w) is on the same side as the bridge line portion (1223c) of the third winding (1223w); the third winding (1223w) includes a second connecting portion (1223s) and a second compensating portion (1223t); the second connecting portion (1223s) is connected to the outgoing line segment (1223f) of the third winding (1223w); the second connecting portion (1223s) is on the same side as the bridge line portion (1223c) of the third winding (1223w); and the second compensating portion (1223t) passes through the wire slot (1224) and is led out on the same side as the electrical connecting portion (1223d).

7. The electric pump (100) according to claim 5, characterized in that: The support portion where the third winding (1223w) starts to be wound is defined as the third support portion (1222e), the support portion (1222a) where the second winding (1223n) starts to be wound is defined as the second support portion (1222d), the wire groove between the second support portion (1222d) and the third support portion (1222e) is defined as the second wire groove (1224b), and the portion of the second compensation portion (1223t) is located in the second wire groove (1224b) and is led out from the second wire groove (1224b).

8. The electric pump (100) according to claim 6, characterized in that: The support portion where the third winding (1223w) starts to be wound is defined as the third support portion (1222e), the support portion (1222a) where the second winding (1223n) starts to be wound is defined as the second support portion (1222d), the wire groove between the second support portion (1222d) and the third support portion (1222e) is defined as the second wire groove (1224b), and the portion of the second compensation portion (1223t) is located in the second wire groove (1224b) and is led out from the second wire groove (1224b).

9. The electric pump (100) according to any one of claims 5 to 8, characterized in that: The windings of the first winding (1223m), the second winding (1223n) and the third winding (1223w) are formed by winding the same uncut winding; the second compensation portion (1223t) of the third winding (1223w) is directly connected to the incoming line segment (1223e) of the second winding (1223n); and the first compensation portion (1223q) of the second winding (1223n) is directly connected to the incoming line segment (1223e) of the first winding (1223m).

10. The electric pump (100) according to any one of claims 2 to 8, characterized in that: The insulating frame (1222) includes a first stopper (1222h) and a second stopper (1222j), the support portion (1222a) connects the first stopper (1222h) and the second stopper (1222j), along the radial direction of the stator assembly (12), the first stopper (1222h) is away from the axis of the stator assembly (12) relative to the second stopper (1222j), and the stator assembly (12) includes a stator core ( 1221), the stator core (1221) includes a tooth portion (1221a), a yoke portion (1221b) and a boot portion (1221c), the first stop portion (1222h) is fixed to the yoke portion (1221b) by injection molding, the support portion (1222a) covers the tooth portion (1221a), the second stop portion (1222j) is fixed to the yoke portion (1221b) by injection molding, and the insulating frame (1222) includes a lead slot (1225), The lead wire groove (1225) is recessed in the upper end of the first stopper (1222h) along the axial direction of the stator assembly (12); the lead wire groove (1225) passes through the first stopper (1222h) along the radial direction of the stator assembly (12); the lead wire groove (1225) is located radially outside the tooth portion (1221a); ​​and the width of the tooth portion (1221a) in the circumferential direction of the stator assembly (12) is less than The width of the guide groove (1225) in the circumferential direction defines a first reference plane (101), and the first reference plane (101) is a plane perpendicular to the axial direction of the stator assembly (12). The support portion (1222a) and the guide groove (1225) are projected forward onto the first reference plane (101). The projections of the two side portions of the support portion (1222a) extend along the radial direction of the stator assembly (12) into the projection of the guide groove (1225).

11. The electric pump (100) according to claim 9, characterized in that: The insulating frame (1222) includes a first stopper (1222h) and a second stopper (1222j), the support portion (1222a) connects the first stopper (1222h) and the second stopper (1222j), along the radial direction of the stator assembly (12), the first stopper (1222h) is away from the axis of the stator assembly (12) relative to the second stopper (1222j), and the stator assembly (12) includes a stator core ( 1221), the stator core (1221) includes a tooth portion (1221a), a yoke portion (1221b) and a boot portion (1221c), the first stop portion (1222h) is fixed to the yoke portion (1221b) by injection molding, the support portion (1222a) covers the tooth portion (1221a), the second stop portion (1222j) is fixed to the yoke portion (1221b) by injection molding, and the insulating frame (1222) includes a lead slot (1225), The lead wire groove (1225) is recessed in the upper end of the first stopper (1222h) along the axial direction of the stator assembly (12); the lead wire groove (1225) passes through the first stopper (1222h) along the radial direction of the stator assembly (12); the lead wire groove (1225) is located radially outside the tooth portion (1221a); ​​and the width of the tooth portion (1221a) in the circumferential direction of the stator assembly (12) is less than The width of the guide groove (1225) in the circumferential direction defines a first reference plane (101), and the first reference plane (101) is a plane perpendicular to the axial direction of the stator assembly (12). The support portion (1222a) and the guide groove (1225) are projected forward onto the first reference plane (101). The projections of the two side portions of the support portion (1222a) extend along the radial direction of the stator assembly (12) into the projection of the guide groove (1225).

12. The electric pump (100) according to claim 10, characterized in that: The support portion (1222a) includes a plurality of sub-support portions (1222b), the lead groove (1225) includes a plurality of sub-lead grooves (1225a), the wall portion corresponding to the sub-lead groove (1225a) includes a first contact portion (1225b) and a second contact portion (1225c), the sub-support portion (1222b) includes a first side portion (1222f) and a second side portion (1222g), along the circumferential direction of the stator assembly (12), the first side portion (1222f) is close to the first contact portion (1225b) relative to the second side portion (1222g), and the second side portion (1222g) is close to the second contact portion (1225c) relative to the first side portion (1222f), and the minimum distance between the first contact portion (1225b) and the first side portion (1222f) is less than the wire diameter of the winding.

13. The electric pump (100) according to claim 11, characterized in that: The support portion (1222a) includes a plurality of sub-support portions (1222b), the lead groove (1225) includes a plurality of sub-lead grooves (1225a), the wall portion corresponding to the sub-lead groove (1225a) includes a first contact portion (1225b) and a second contact portion (1225c), the sub-support portion (1222b) includes a first side portion (1222f) and a second side portion (1222g), along the circumferential direction of the stator assembly (12), the first side portion (1222f) is close to the first contact portion (1225b) relative to the second side portion (1222g), and the second side portion (1222g) is close to the second contact portion (1225c) relative to the first side portion (1222f), and the minimum distance between the first contact portion (1225b) and the first side portion (1222f) is less than the wire diameter of the winding.

14. The electric pump (100) according to any one of claims 2 to 8, characterized in that: The stator assembly (12) is orthographically projected along the direction where the electrical connection portion (1223d) is located, and the multiple winding portions (1223b) of the first winding (1223m) are wound in sequence along the clockwise direction of the stator assembly (12), and the multiple winding portions (1223b) of the second winding (1223n) are wound in sequence along the counterclockwise direction of the stator assembly (12).

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