ELECTRIC WATER PUMP

Abstract

An electric water pump is disclosed. The electric water pump comprises a housing, which includes a housing body, a printed circuit board (PCB), and a stator return, and an impeller, which includes an impeller body and a magnet. The housing body includes an inlet and an outlet and has a defined interior space, and the stator return is integrally embedded in the housing body. The impeller is arranged within the interior space of the housing body and is rotatably mounted about a rotating shaft.

Description

BACKGROUND 1. Field of the invention

[0001] The present disclosure relates to an electric water pump and in particular an electric water pump of the type of an axial flux motor, which can be used, for example, in a vehicle for supplying coolant. 2. Description of the state of the art

[0002] An electric water pump is used in a vehicle to supply coolant for cooling a battery, a powertrain electronics (PE) compartment, or similar components. For example, an electric water pump can be designed like an axial flux motor. However, a conventional electric water pump has a problem in that a printed circuit board (PCB), a return path, and a magnet are in contact with the coolant and are easily corroded by chemical components of the coolant. The contaminants produced by this corrosion can lead to pump malfunctions and reduce the pump's lifespan.Furthermore, if the PCB, backing, and magnet are not tightly fastened, the stiffness of the components can decrease, and vibration-induced resonances can worsen the noise, vibration, and harshness (NVH) characteristics. SUMMARY

[0003] One aspect of the present disclosure is to provide an electric water pump that is capable of preventing corrosion caused by contact with coolant.

[0004] Another aspect of the present disclosure is to provide an electric water pump that is capable of tightly fastening associated components.

[0005] An electric water pump according to the present disclosure comprises a housing body, a printed circuit board (PCB) and a stator back, wherein the housing body comprises an inlet and an outlet and has an interior space defined therein, wherein the stator back is integrally embedded in the housing body, and an impeller is arranged in the interior space of the housing body and is rotatably mounted about a rotating shaft, wherein the impeller comprises an impeller body and a magnet.

[0006] The PCB, together with the stator return, can be integrally embedded in the housing body.

[0007] The PCB can be constructed in such a way that a copper foil pattern serving as a stator coil is printed onto a substrate in such a way that it is integrally formed with it.

[0008] The magnet can be integrally embedded in the impeller body.

[0009] The PCB and the magnet can be arranged opposite each other on a surface of the housing or a surface of the impeller in a direction parallel to the rotating shaft, and the rotor return can be arranged opposite the magnet with respect to the PCB.

[0010] The PCB, together with the stator return, can be integrally embedded in the housing body.

[0011] A gap can be defined between one surface of the housing and one surface of the impeller to allow coolant to pass between one surface of the housing and one surface of the impeller.

[0012] The PCB can be located outside the housing body on one side of a surface of the housing.

[0013] A gap can be defined between the PCB and a surface of the impeller to allow coolant to pass between the PCB and a surface of the impeller.

[0014] The impeller body can include a rotating shaft support section surrounding the rotating shaft, and the PCB can be designed in an annular shape so that the rotating shaft support section can be arranged in the center of the PCB.

[0015] A gap can be defined between the PCB and the rotary shaft support section to allow the passage of coolant between the PCB and the rotary shaft support section.

[0016] A gap can be defined between the PCB and the housing body to allow coolant to pass between the PCB and the housing body on one side of a surface of the housing.

[0017] The PCB may include a through-hole formed within it to allow coolant to pass through the PCB.

[0018] The housing may also include a sealing element that is positioned between an edge region of the PCB and the housing body.

[0019] The impeller can also include a rotor return.

[0020] The rotor backstop can be integrally embedded in the impeller body.

[0021] The magnet and the rotor return can be integrally embedded in the impeller body.

[0022] The PCB and the magnet can be arranged opposite each other on a surface of the housing or a surface of the impeller in a direction parallel to the rotating shaft, the stator return can be arranged opposite the magnet with respect to the PCB, and the rotor return can be arranged opposite the magnet of the PCB with respect to the PCB.

[0023] The impeller body can include a rotating shaft support section surrounding the rotating shaft, and the magnet can be ring-shaped to allow the rotating shaft support section to be arranged in the center of the magnet.

[0024] The impeller body may include a rotating shaft support section surrounding the rotating shaft, and the electric water pump may include a bearing arranged between the rotating shaft support section and the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are included in this description, illustrate exemplary embodiments and, in conjunction with the following detailed description of exemplary embodiments, serve to further illustrate the technical ideas of the disclosure, and the disclosure is not to be interpreted as being limited to what is shown in these drawings. The drawings show: theFig. 1 a cross-sectional view of an electric water pump according to a first embodiment of the present disclosure; the Fig. 2 an enlarged view of sub-area A in the Fig. 1; the Fig. 3 a view in which a coolant flow in the Fig. 2 is shown; the Fig. 4 a top view of a printed circuit board (PCB) of the electric water pump according to the first embodiment of the present disclosure; the Fig. 5 a partial cross-sectional view of an electric water pump according to a second embodiment of the present disclosure, in which a partial area is shown in accordance with the Fig. 2 is shown; the Fig. 6 a partial cross-sectional view of an electric water pump according to a third embodiment of the present disclosure, in which a partial area is shown in accordance with the Fig. 2 is shown; the Fig. 7 a view in which a coolant flow in the Fig. 6 is shown; the Fig. 8 a partial cross-sectional view of an electric water pump according to a fourth embodiment of the present disclosure, in which a partial area corresponding to the Fig. 2 is shown; the Fig. 9 a view in which a coolant flow in the Fig. 8 is shown; the Fig. 10 a partial cross-sectional view of an electric water pump according to a fifth embodiment of the present disclosure, in which a partial area is shown in accordance with the Fig. 2 is shown; and the Fig. 11 a view in which a coolant flow in the Fig. 10 is shown. DETAILED DESCRIPTION OF EXAMPLE FORMS OF EXECUTION

[0026] With reference to the attached drawings, electric water pumps according to embodiments of the present disclosure are described in detail. First embodiment

[0027] The Fig. Figure 1 is a cross-sectional view of an electric water pump 100 according to a first embodiment of the present disclosure. Fig. Figure 2 is an enlarged view of sub-area A in the Fig. 1. The Fig. 3 is a view in which a flow of coolant F1 is shown in the Fig. 2 is shown. Fig. Figure 4 is a top view of a printed circuit board (PCB) 112 of the electric water pump 100 according to the first embodiment of the present disclosure.

[0028] With reference to the Fig. 1, Fig. 2, Fig. 3 to Fig. 4. According to the first embodiment of the present disclosure, the electric water pump 100 can, for example, be designed according to the design of an axial flux motor (AFM). The electric water pump 100 can comprise a housing 110 and an impeller 120.

[0029] The housing 110 can comprise a housing body 111, a PCB 112 and a stator return 113.

[0030] The housing body 111 can include an inlet 111a through which a fluid, for example coolant, is introduced, and an outlet 111b through which the coolant is discharged. In the drawings, the inlet 111a is shown in a vertical orientation and the outlet 111b is shown in a horizontal orientation.

[0031] The housing body 111 can have a defined interior space for receiving the impeller 120. The housing body 111 can include a rotating shaft 111c for rotating the impeller 120.

[0032] The housing body 111 can be divided into several parts. For example, the housing body 111 can be divided into a lower part 1111 and an upper part 1112. The electric water pump 100 can be assembled such that the impeller 120 is attached to the lower part 1111 and the upper part 1112 is coupled to the lower part 1111 and the impeller 120 from above. In the drawings, the inlet 111a and the outlet 111b are shown as formed in the upper part 1112, and the drive shaft 111c is shown as extending upwards from the lower part 1111.

[0033] The PCB 112 can include elements for driving and controlling the motor. The PCB 112 can be arranged on one side of the housing body 111 facing a magnet 122 of the impeller 120. Based on the drawings, the PCB 112 can also be arranged on the upper surface of the lower part 1111 of the housing body 111.

[0034] For example, the PCB 112 can be formed in a ring shape or annular form, and the rotating shaft 111c or a rotating shaft support section 121a of an impeller body 121 of the impeller 120 can be arranged concentrically in the center of the PCB 112.

[0035] As in the Fig. As shown in Figure 4, the PCB 112 can have a structure in which a copper foil pattern 112a serving as a stator coil is printed onto a disk-shaped substrate 112b, so that it is integrally formed with it. Therefore, a more compact structure can be achieved compared to a conventional structure in which a copper wire is wound around an iron core. The PCB 112 can include (not shown) elements for motor drive control. The types of such elements or their arrangement can be modified as required and are therefore not specifically limited in this disclosure.

[0036] The stator return 113, together with the rotor return 123 of the impeller 120, can be used to define a magnetic flux path. The stator return 113 can be arranged opposite the rotor return 123 with respect to the PCB 112. Based on the drawings, the stator return 113 can be arranged below the PCB 112.

[0037] As in the Fig. As shown in Figure 2, the PCB 112 and the stator return 113 of the electric water pump 100 can be integrally embedded in the housing body 111 according to the first embodiment of the present disclosure. The material forming the housing body 111 can completely surround the PCB 112 and the stator return 113. For example, the PCB 112 and the stator return 113 can be integrally formed with the housing body 111 by a spraying or injection molding process. Therefore, no separate means are required to prevent corrosion of the PCB 112 and the stator return 113 due to contact with coolant, and no separate means are required to secure the PCB 112 and the stator return 113 to the housing body 111.

[0038] The impeller 120 can be arranged in the interior of the housing body 111 and rotatably mounted about the rotating shaft 111c. The impeller 120 can comprise an impeller body 121, a magnet 122, and a rotor return 123. The impeller body 121 can be configured such that, when the impeller body 121 rotates about the rotating shaft 111c, it forces a fluid to flow from the inlet 111a to the outlet 111b.

[0039] The impeller body 121 can include a rotating shaft support section 121a surrounding the rotating shaft 111c, and a bearing B can be arranged between the rotating shaft 111c and the rotating shaft support section 121a. The magnet 122 can be arranged on a surface of the impeller body 121 facing the PCB 112. Based on the drawings, the magnet 122 can be arranged on the lower surface of the impeller body 121. For example, the magnet 122 can be in a ring shape or annular form, and the rotating shaft support section 121a of the impeller body 121 can be arranged concentrically in the center of the magnet 122. The magnet 122 can be relatively flat. For example, the length of the magnet 122 in a rotating shaft direction can be less than the length between an outer diameter section and an inner diameter section of the magnet 122. With this design, the electric water pump 100 can be made more compact.

[0040] The rotor return path 123 can serve to form a magnetic flux path together with the stator return path 113. The rotor return path 123 can be arranged opposite the stator return path 113 with respect to the magnet 122. Based on the drawings, the rotor return path 123 can be arranged on the magnet 122.

[0041] The magnet 122 and the rotor end cap 123 can be integrally embedded in the impeller body 121. The material forming the impeller body 121 can completely surround the magnet 122 and the rotor end cap 123. For example, the magnet 122 and the rotor end cap 123 can be integrally manufactured with the impeller body 121 by a spraying or injection molding process.

[0042] Therefore, no separate means are required to prevent corrosion of the magnet 122 and the rotor return 123 due to contact with coolant, and no separate means are required to attach the magnet 122 and the rotor return 123 to the impeller body 121.

[0043] To allow the impeller 120 to rotate smoothly relative to the housing 110, predetermined gaps (clearances or spacings) G1 and G2 can be defined between the housing 110 and the impeller 120. For example, a gap G1 can be defined between the inner circumferential surface of the interior of the housing body 111 and the outer circumferential surface of the impeller body 121, and a gap G2 can be defined between the upper surface of the lower part 1111 of the housing body 111 and the lower surface of the impeller body 121. As in the Fig. As shown in Figure 3, columns G1 and G2 can also serve to allow the coolant F1, flowing from inlet 111a to outlet 111b, to naturally enter and flow through columns G1 and G2. As a result, PCB 112 and magnet 122 can be cooled by the coolant F1. Second embodiment

[0044] The Fig. 5 is a partial cross-sectional view of an electric water pump according to a second embodiment of the present disclosure, in which a partial area is shown according to the Fig. 2 is shown.

[0045] In the electric water pump 100 according to the first embodiment of the present disclosure, the PCB 112 and the stator return 113, which are provided in the housing 110, are integrally manufactured with the housing body 111 by an injection molding or injection molding process, so that they are integrally embedded in the housing body 111, and the magnet 122 and the rotor return 123, which are provided in the impeller 120, are integrally manufactured with the impeller body 121 by an injection molding or injection molding process, so that they are integrally embedded in the impeller body 121, whereas the electric water pump according to the second embodiment of the present disclosure is characterized in that the PCB 112 and the stator return 113, which are provided in the housing, are integrally manufactured with the housing body 111 by an injection molding or injection molding process, so that they are integrally embedded in the housing body 111.However, the impeller is designed differently from the impeller of the electric water pump according to the first embodiment of the present disclosure. In the electric water pump according to the second embodiment of the present disclosure, the other parts are essentially the same as those of the electric water pump according to the first embodiment of the present disclosure. Even if some differences exist, such differences are merely modifications that a person skilled in the art can readily make starting from the embodiments described above and below. Thus, redundant descriptions of the same parts are omitted, and the same reference numerals are used throughout the detailed description of the disclosure and the drawings.

[0046] For example, the magnet 222 can be made of neodymium, or the rotor end cap 223 can be made of a material such as SUM24L. If the magnet 222 or the rotor end cap 223 is made of a material that exhibits high corrosion resistance to the coolant, then the magnet 222 or the rotor end cap 223 does not need to be embedded in the impeller body 221.

[0047] In the electric water pump according to the second embodiment of the present disclosure, the PCB 112 and the stator back 113, which are provided in the housing, can be integrally manufactured with the housing body 111 by an injection molding or injection molding process, so that they are integrally embedded in the housing body 111, whereas the magnet 222 or the rotor back 223, which are provided in the impeller, can be attached, for example, using a special holder or other fastening means, outside the lower surface of the impeller body 221, instead of being integrally embedded in the impeller body 221.

[0048] To further protect the magnet 222 or the rotor return 223 from corrosion caused by contact with the coolant, a coating process can also be carried out, at least on the surface of the magnet 222 or the return 223 that is exposed to the coolant. The material or method of the coating process is not specifically limited in this disclosure, as long as the magnet 222 or the rotor return 223 can be adequately protected from corrosion caused by contact with the coolant without adversely affecting the electromagnetic drive of the magnet 222 or the rotor return 223. Third embodiment

[0049] the Fig. 6 is a partial cross-sectional view of an electric water pump according to a third embodiment of the present disclosure, in which a partial area is shown according to the Fig. 2 is shown. Fig. 7 is a view in which a flow of coolant F2 is shown in the Fig. 6 is shown.

[0050] In the electric water pump 100 according to the first embodiment of the present disclosure or the electric water pump according to the second embodiment of the present disclosure, the PCB 112 and the stator return 113, which are provided in the housing 110, are integrally manufactured with the housing body 111 by an injection molding or injection molding process, so that they are integrally embedded in the housing body 111, whereas the electric water pump according to the third embodiment of the present disclosure is characterized in that only the stator return 313 is integrally manufactured with the housing body 311 by an injection molding or injection molding process, so that it is integrally embedded in the housing body 311.However, PCB 312 is mounted differently than the PCB of the electric water pump according to the first embodiment of the present disclosure or the PCB of the electric water pump according to the second embodiment of the present disclosure. In the electric water pump according to the third embodiment of the present disclosure, the other parts are essentially the same as those of the electric water pump according to the first embodiment of the present disclosure or the electric water pump according to the second embodiment of the present disclosure. Even if some differences exist, such differences are merely modifications that a person skilled in the art can readily make starting from the embodiments described above and below. Thus, redundant descriptions of the same parts are omitted.and the same reference symbols are used throughout the entire detailed description of the revelation and the drawings.

[0051] For example, PCB 312 can be made of a material such as FR4. Therefore, if PCB 312 is made of a material that exhibits high corrosion resistance to the coolant, it may not be necessary to embed PCB 312 in the housing body 311.

[0052] For this purpose, in the electric water pump according to the third embodiment of the present disclosure, only the stator back 313 can be integrally manufactured with the housing body 311 by an injection molding or injection process, so that it is integrally embedded in the housing body 311, whereas the PCB 312 can, for example, be attached outside the upper surface of the impeller body of the lower part 3111 of the housing body 311 using a special holder or other fastening means, instead of being integrally embedded in the housing body 311.

[0053] To further protect the PCB 312 from corrosion caused by contact with the coolant, a coating process can be carried out, at least on the surface of the PCB 312 exposed to the coolant. The material or method of the coating process is not specifically limited in this disclosure, as long as the PCB 312 can be adequately protected from corrosion caused by contact with the coolant without adversely affecting the electromagnetic drive of the PCB 312.

[0054] As described above, predetermined gaps (clearances or spacings) G3 and G4 can be defined between the housing and the impeller to allow the impeller to rotate smoothly relative to the housing. As described in the Fig. As shown in Figure 6, a gap G4 can be defined between the PCB 312 and the lower surface of the impeller to allow the coolant F2 to pass through. This allows the coolant F2 to come into direct contact with the PCB 312, thus enabling effective cooling of the PCB 312.

[0055] A sealing element S can be provided to prevent leakage of the coolant F2 from the housing body 311. For example, the upper surface of an edge section of the PCB 312 can be in contact with the lower surface of the upper part 3112 of the housing body 311, and the sealing element S can be arranged between them. The sealing element S can include an O-ring, and a circular groove can be formed in the lower surface of the upper part 3112 of the housing body 311 to receive the O-ring-like sealing element S.

[0056] Similar to the electric water pump 100 according to the first embodiment of the present disclosure, in the electric water pump according to the third embodiment of the present disclosure, the magnet 122 and the rotor end cap 123 can be integrally formed with the impeller body 121 by a spraying or injection molding process, so that they are integrally embedded in the impeller body 121. Similar to the electric water pump according to the second embodiment of the present disclosure, the magnet 222 and the rotor end cap 223 can be attached outside the lower surface of the impeller body 221. The latter case is illustrated in the drawings. Fourth embodiment

[0057] the Fig. 8 is a partial cross-sectional view of an electric water pump according to a fourth embodiment of the present disclosure, in which a partial area is shown according to the Fig. 2 is shown. Fig. 9 is a view in which a flow of coolant F3 is shown in the Fig. 8 is shown.

[0058] The electric water pump according to the fourth embodiment of the present disclosure can be a partial modification of the electric water pump according to the third embodiment of the present disclosure. In the electric water pump according to the third embodiment of the present disclosure, an entire surface of the PCB 312 can be in contact with the upper surface of the lower part 3111 of the housing body 311, whereas the electric water pump according to the fourth embodiment of the present disclosure is characterized in that at least a region of the PCB 412 is spaced away from the upper surface of the lower part 4111 of the housing body 411.

[0059] The electric water pump according to the fourth embodiment of the present disclosure can further comprise a gap G5 between the PCB 412 and the upper surface of the lower part 4111 of the housing body 411 to allow the passage of the coolant between them.

[0060] The gap G5 can be formed, for example, by recessing the upper surface of the lower part 4111 of the housing body 411 to create a step.

[0061] As in the Fig. As shown in Figure 9, the coolant F3 can flow from the gap G3 between the inner circumferential surface of the interior of the housing body 411 and the outer circumferential surface of the impeller, via the gap G4 between the PCB 412 and the lower surface of the impeller, and the gap G6 between the PCB 412 and the rotating shaft support section of the impeller body 221, to the gap G5 between the PCB 412 and the upper surface of the lower part 4111 of the housing body 411. As a result, both the top and bottom surfaces of the PCB 412 can be cooled by the coolant F3, thus achieving more effective cooling of the PCB 412.

[0062] Sealing elements S1 and S2 can be provided to prevent leakage of the coolant F3 from the housing body 411. For example, the upper surface of an edge section of the PCB 412 can be in contact with the lower surface of the upper part 4112 of the housing body 411, and the sealing element S1 can be positioned between them. The sealing element S1 can include an O-ring, and a circular groove can be formed in the lower surface of the upper part 4112 of the housing body 411 to receive the O-ring-like sealing element S1. Similarly, the lower surface of the edge section of the PCB 412 can be in contact with the upper surface of the lower part 4111 of the housing body 411, and the sealing element S2 can be positioned between them.The sealing element S2 can include an O-ring, and a circular groove for receiving the O-ring-like sealing element S2 can be formed in the upper surface of the lower part 4111 of the housing body 411.

[0063] In the electric water pump according to the fourth embodiment of the present disclosure, the other parts are essentially the same as those of the electric water pump according to the third embodiment of the present disclosure. Even if some differences exist, such differences are merely modifications that a person skilled in the art could readily make starting from the embodiments described above. Thus, redundant descriptions of the same parts are omitted, and the same reference numerals are used throughout the detailed description of the disclosure and the drawings. Fifth embodiment

[0064] The Fig. 10 is a partial cross-sectional view of an electric water pump according to a fifth embodiment of the present disclosure, in which a partial area is shown in accordance with the Fig. 2 is shown. Fig. 11 is a view in which a flow of coolant F4 is shown in the Fig. 10 is shown.

[0065] The electric water pump according to the fifth embodiment of the present disclosure differs from the electric water pump according to the fourth embodiment of the present disclosure in that the PCB 512 comprises a through-hole 512a formed therein.

[0066] The electric water pump according to the fifth embodiment of the present disclosure can, for example, comprise a through-hole 512a formed vertically through the PCB 512.

[0067] As in the Fig.As shown in Figure 10, the coolant F4 is enabled to flow from the gap G3 between the inner circumferential surface of the interior in the housing body 411 and the outer circumferential surface of the impeller, via the gap G4 between the PCB 512 and the lower surface of the impeller, and the gap G6 between the PCB 512 and the rotating shaft support section of the impeller body 221, to the gap G5 between the PCB 512 and the upper surface of the lower part 4111 of the housing body 411. Additionally, the coolant F4 is enabled to flow directly from the gap G3 between the inner circumferential surface of the interior in the housing body 411 and the outer circumferential surface of the impeller through the through-hole 512a to the gap G5 between the PCB 512 and the upper surface of the lower part 4111 of the housing body 411, thereby improving the cooling effect.

[0068] The through-hole 512a can be arranged in a direction parallel to the rotating shaft, aligned with the gap G3 between the inner circumferential surface of the interior in the housing body 411 and the outer circumferential surface of the impeller. This allows the coolant exiting from the gap G3 between the inner circumferential surface of the interior in the housing body 411 and the outer circumferential surface of the impeller to more easily enter the through-hole 512a.

[0069] In some embodiments, the through-hole 512a can be provided multiple times, and the majority of through-holes 512a can be arranged in the circumferential direction or in the radial direction of the PCB 512 or can be distributed over the entire surface of the PCB 512.

[0070] In the electric water pump according to the fifth embodiment of the present disclosure, the other parts are essentially the same as those of the electric water pump according to the fourth embodiment of the present disclosure. Even if some differences exist, such differences are merely modifications that a person skilled in the art could readily make starting from the embodiments described above. Thus, redundant descriptions of the same parts are omitted, and the same reference numerals are used throughout the detailed description of the disclosure and the drawings.

[0071] The electric water pump described above is merely one of several embodiments of the electric water pump according to the present disclosure.

[0072] As can be seen from the description above, in the electric water pump according to the present disclosure, components that are susceptible to corrosion by contact with coolant, such as a stator back, a PCB, a magnet and a rotor back, can be integrally manufactured with a housing body or an impeller body by an injection molding or injection molding process, so that they are integrally embedded in the housing body or impeller body, thereby preventing corrosion by contact with the coolant.

[0073] Furthermore, the associated components can be securely attached using the spraying or injection molding process.

[0074] Furthermore, gaps or passages can be defined between the associated components to allow the passage of coolant between them, thereby achieving a cooling effect using the coolant.

[0075] Although the present disclosure has been described above with reference to the exemplary embodiments, the present disclosure is not limited thereto, and it is understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the disclosure as defined by the attached claims.

Claims

Electric water pump comprising: a housing comprising a housing body, a printed circuit board (PCB) and a stator back, wherein the housing body comprises an inlet and an outlet and has an interior space defined therein, wherein the stator back is integrally embedded in the housing body; and an impeller arranged in the interior space of the housing body and rotatably mounted about a rotating shaft, wherein the impeller comprises an impeller body and a magnet. Electric water pump according to claim 1, wherein the PCB together with the stator return is integrally embedded in the housing body. Electric water pump according to claim 1, wherein the PCB is constructed such that a copper foil pattern serving as a stator coil is printed onto a substrate, so that it is integrally formed with it. Electric water pump according to claim 1, wherein the magnet is integrally embedded in the impeller body. Electric water pump according to claim 1, wherein the PCB and the magnet are arranged opposite each other on a surface of the housing or a surface of the impeller in a direction parallel to the rotating shaft, and wherein the stator return is arranged opposite the magnet with respect to the PCB. Electric water pump according to claim 5, wherein the PCB together with the stator return is integrally embedded in the housing body. Electric water pump according to claim 6, wherein a gap is defined between one surface of the housing and one surface of the impeller to allow the passage of coolant between one surface of the housing and one surface of the impeller. Electric water pump according to claim 5, wherein the PCB is arranged outside the housing body on one side of one surface of the housing. Electric water pump according to claim 8, wherein a gap is defined between the PCB and one surface of the impeller to allow the passage of coolant between the PCB and one surface of the impeller. Electric water pump according to claim 8, wherein the impeller body comprises a rotating shaft support section surrounding the rotating shaft, and wherein the PCB is designed in an annular form so that the rotating shaft support section can be arranged in the center of the PCB. Electric water pump according to claim 10, wherein a gap is defined between the PCB and the rotating shaft support section to allow the passage of coolant between the PCB and the rotating shaft support section. Electric water pump according to claim 9, wherein a gap is defined between the PCB and the housing body to allow the passage of coolant between the PCB and the housing body on one side of one surface of the housing. Electric water pump according to claim 12, wherein the PCB comprises a through-hole formed therein to allow the passage of coolant through the PCB. Electric water pump according to claim 8, wherein the housing further comprises a sealing element arranged between an edge region of the PCB and the housing body. Electric water pump according to claim 1, wherein the impeller further comprises a rotor return. Electric water pump according to claim 15, wherein the rotor backing is integrally embedded in the impeller body. Electric water pump according to claim 15, wherein the magnet and the rotor return are integrally embedded in the impeller body. Electric water pump according to claim 15, wherein the PCB and the magnet are arranged opposite each other on a surface of the housing or a surface of the impeller in a direction parallel to the rotating shaft, wherein the stator return is arranged opposite the magnet with respect to the PCB, and wherein the rotor return is arranged opposite the magnet of the PCB with respect to the magnet. Electric water pump according to claim 1, wherein the impeller body comprises a rotating shaft support section surrounding the rotating shaft, and wherein the magnet is designed in a ring shape so that the rotating shaft support section can be arranged in the center of the magnet. Electric water pump according to claim 1, wherein the impeller body comprises a rotating shaft support section surrounding the rotating shaft; and wherein the electric water pump comprises a bearing arranged between the rotating shaft support section and the rotating shaft.

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