Pump motor with cooled two-part electronic module

Abstract

The present disclosure relates to a pump motor (1) comprising a rotor (2) mounted to a drive shaft (3) extending along a rotor axis (L), the rotor (2) being circumferentially embraced by a stator, a stator housing (5) enclosing the stator, wherein the stator housing (5) comprises a first axial end and a second axial end, electronics for powering and controlling the motor operation, wherein a first portion of the electronics is arranged on a first PCB and a second portion of the electronics is arranged on a second PCB (51), and a first electronics housing (11) accommodating the first PCB, wherein the first electronics housing (11) is arranged at a periphery of the stator housing (5), characterized by further comprising a second electronics housing (47) accommodating the second PCB (51), wherein the second electronics housing (47) is arranged at the second axial end of the stator housing (5), wherein the second electronics housing (47) at least partially surrounds the drive shaft (3).

Description

Technical Field

[0001] This disclosure generally relates to pump motors, i.e., pump motors commonly used to drive any type of pump, particularly speed-controlled multistage or single-stage centrifugal pumps. Preferably, the pump motor is part of a pump assembly that includes the pump. This disclosure is particularly applicable to pump motors with a power exceeding 0.7 kW. Background Technology

[0002] Typically, a pump motor includes a stator housing that encloses a rotor mounted on a rotor shaft. The rotor shaft extends along the rotor axis and protrudes from the drive end of the stator housing to drive the pump impeller. For example, as known from WO2013 / 135465A1, a cooling fan is arranged at the non-drive end of the stator housing such that cooling air flows along transverse cooling ribs extending axially from the stator housing. The cooling fan is typically driven by the rotor shaft, which protrudes from the non-drive end of the stator housing.

[0003] In WO2013 / 135465A1, the electronics housing is mounted to the periphery of the stator housing. The electronics housing houses the control electronics used to control motor operation; specifically, the control electronics include a frequency converter for controlling motor speed. During motor operation, the control electronics generate heat, which must be dissipated to prevent damage and malfunction. WO2013 / 135465A1 recommends that the electronics housing protrude beyond the non-drive end of the stator housing to receive a portion of the radial airflow from a cooling fan, thereby cooling the control electronics within the electronics housing.

[0004] However, a drawback of the WO2013 / 135465A1 solution is that the electronics housing is relatively large compared to the stator housing. Previous attempts to reduce the size of the electronics housing have been limited by the requirements for adequate heat dissipation of the electronics.

[0005] Therefore, the problem of this disclosure is to provide a more compact pump motor that has adequate cooling for the control electronics. Summary of the Invention

[0006] According to a first aspect of this disclosure, a pump motor is provided, wherein the pump motor includes:

[0007] - A rotor, which is mounted to a drive shaft extending along the rotor axis, wherein the rotor is circumferentially encircled by the stator.

[0008] - A stator housing that surrounds the stator, wherein the stator housing includes a first axial end and a second axial end.

[0009] - Electronic devices for supplying power to and controlling the operation of a motor, wherein a first part of the electronic device is disposed on a first PCB, a second part of the electronic device is disposed on a second PCB, and

[0010] - A first electronic device housing that houses a first PCB, wherein the first electronic device housing is arranged at the periphery of the stator housing.

[0011] In addition, the pump motor includes a second electronic housing that houses a second PCB, wherein the second electronic housing is arranged at a second axial end of the stator housing and wherein the second electronic housing at least partially surrounds the drive shaft.

[0012] The term "surrounding" or "encircling" in this document means that the drive shaft is at least partially surrounded by the outer surface of the second electronic device housing. In other words, the drive shaft protrudes through the second electronic device housing without protruding into the internal volume of the second electronic device housing.

[0013] Optionally, the first part of the electronic device may include power electronics, and the second part of the electronic device may include a line filter. Preferably, the electronic device includes a frequency converter for controlling the motor speed. The power electronics may include the inverter circuit of the frequency converter, which generates a large amount of heat during motor operation. Components that generate less heat (e.g., the rectifier circuit or DC link of the frequency converter) are preferably arranged on the first PCB. However, the rectifier circuit and / or DC link may alternatively be arranged on a second PCB within the second electronic device housing. The line filter connected to the input side of the rectifier circuit is preferably arranged on the second PCB within the second electronic device housing because the relatively large components of the second PCB allow for a smaller design of the first electronic device housing. Furthermore, the components of the line filter also generate a large amount of heat, which must be dissipated to avoid any damage to the electronic device.

[0014] Optionally, a drive shaft may protrude from a first axial end of the stator housing to drive the pump, and a drive shaft may protrude from a second axial end of the stator housing to drive a cooling fan. In other words, a second electronics housing is arranged at the non-drive end of the pump motor, and the pump is coupled to the drive end of the pump motor. Preferably, the pump motor may further include a cooling fan mounted to the drive shaft, wherein the second electronics housing is axially arranged between the cooling fan and the second axial end of the stator housing. This has the advantage that the outer surface of the second electronics housing is cooled by the airflow driven by the cooling fan.

[0015] Optionally, the pump motor may further include a fan shroud, wherein the cooling fan is a radial fan axially arranged between the fan shroud and the second electronics housing, wherein the fan shroud is configured to axially guide the cooling fan outlet flow along the lateral side of the second electronics housing toward axially extending transverse stator housing cooling ribs. Preferably, the fan shroud may include a completely enclosed axial front. This has the advantage that the noise generated by the pump motor is significantly absorbed by the cooling fan shroud. Therefore, the noise of the pump motor is significantly reduced.

[0016] Optionally, the second electronics housing may define a central axial channel through which the drive shaft extends. Preferably, this channel may define a cooling fan inlet for mounting a cooling fan to the drive shaft. Therefore, instead of drawing air through a closed axial front, the radial cooling fan draws air through the central axial channel of the second electronics housing. Consequently, the cooling fan and fan shroud guide the cooling airflow along a 180° turn, using both the inlet and outlet flows of the cooling fan to cool the pump motor components. The inlet flow primarily cools the electronics, while the outlet flow primarily cools the stator housing.

[0017] Optionally, the second electronic device housing includes an output connector facing the first electronic device housing. This output connector can be a wired connector and / or a plug-in connection.

[0018] Optionally, the second electronic component housing can be pre-assembled as a unit and installed onto the second axial end of the stator housing. This facilitates and speeds up the assembly process of the motor pump.

[0019] Optionally, the second PCB may extend in a plane perpendicular to the rotor axis, and the second PCB may include a hole through which the drive shaft extends. Therefore, the second electronics housing can define a substantially annular internal volume within which the second PCB is arranged in an annular plane perpendicular to the rotor axis. This arrangement further reduces space consumption and allows for a very compact pump motor design.

[0020] Optionally, the inlet flow path is defined between the first electronics housing and the stator housing. Therefore, the inlet flow of the cooling fan cools the assembly of the stator housing and the first electronics housing before reaching the cooling fan through the central axial channel defined by the second electronics housing. The radial cooling fan then drives the outlet flow radially outward, wherein the fan shroud axially redirects the outlet flow along the transverse side of the ribbed stator housing.

[0021] Optionally, the first electronic device housing may include a first housing portion and a second housing portion, wherein the first housing portion is thermally coupled to the stator housing, and wherein the second housing portion, including the first PCB, is thermally decoupled from the first housing portion and the stator housing. Preferably, the first housing portion may be made of the same metal material as the stator housing. The first housing portion may even be integrally molded as part of the stator housing. Preferably, the first housing portion may be arranged closer to the rotor axis than the second housing portion.

[0022] Optionally, the first housing portion may include a first material having a first thermal conductivity, and the second housing portion may include a second material having a second thermal conductivity, wherein the first thermal conductivity is significantly higher than the second thermal conductivity. For example, the first material may be a metal, and the second material may be a plastic.

[0023] Optionally, the first PCB may be thermally coupled to a heat sink disposed between the first PCB and the stator housing, wherein the heat sink includes heat sink cooling ribs facing the stator housing, wherein the stator housing includes stator housing cooling ribs facing the heat sink, and wherein the heat sink cooling ribs and the stator housing cooling ribs complement each other to define an inlet flow path toward a cooling fan intake, which is defined by a second electronics housing. Preferably, the inlet flow path follows a curved path, the inlet of which is disposed on a transverse surface of the first electronics housing, and the outlet of which is axially disposed within the first electronics housing.

[0024] Optionally, the heat sink cooling fins and stator housing cooling fins are thermally decoupled from each other by a distance. Therefore, the heat sink cooling fins and stator housing cooling fins are close enough to define the inlet flow path, but far enough apart to reduce heat transfer between them. Consequently, the heat sink cooling fins and stator housing cooling fins may have different temperatures, as the heat sink cooling fins primarily dissipate heat generated by the power electronics of the first PCB, while the stator housing cooling fins primarily dissipate heat generated by the stator. The thermal decoupling between the heat sink cooling fins and stator housing cooling fins particularly reduces the risk of heat transfer from the hot stator housing cooling fins to the heat sink cooling fins, which would reduce their ability to dissipate heat generated by the power electronics. Thermal decoupling effectively allows for a more compact first electronics housing design because the heat sink cooling fins and stator housing cooling fins are cooled independently of each other along the same inlet flow path they define together.

[0025] Optionally, the radiator cooling ribs and stator housing cooling ribs define a curved inlet flow path that extends from the transverse flow path inlet toward the second axial end of the stator housing. The curved inlet flow path enhances the heat dissipation effect of the cooling inflow.

[0026] Optionally, the first electronic device housing may include a protrusion that axially extends beyond a second axial end of the stator housing, wherein the protrusion receives at least a portion of the second electronic device housing. In other words, the first and second electronic device housings may together define an L-shape along which an internal inlet flow path exists between the two electronic device housings and the stator housing. A first leg of the L-shape extends axially between the first electronic device housing and the stator housing, and a second leg of the L-shape extends radially between the second electronic device housing and the stator housing.

[0027] Optionally, the first electronic device housing may define an external lateral flow path inlet and an internal flow path outlet oriented toward the second electronic device housing. Therefore, radial inward flow exists on the axial side of the second electronic device housing facing the stator housing.

[0028] Alternatively, the second electronic component housing can be secured to the stator housing by at least one conductive screw, wherein the at least one screw connects the ground of the second PCB to the stator housing. This is a very efficient way to secure the electronic component housing to the stator housing and provide electrical grounding for both the second PCB and the stator housing.

[0029] Optionally, the second electronic device housing may include a power connector on a lateral side of the second electronic device housing, such that the first PCB in the first electronic device housing is powered via the second PCB in the second electronic device housing. Preferably, the first housing portion of the first electronic device housing may include a lateral opening through which a power plug can be connected to the power connector of the second electronic device housing. Preferably, the power plug is angled to contribute to the overall compact design of the pump motor.

[0030] Optionally, the second electronic device housing may protrude at least partially into the first electronic device housing.

[0031] Optionally, the second PCB may include at least one hole through which at least one screw protrudes, wherein the second PCB includes a ground contact surrounding the hole. This is a very efficient way to provide ground contact by using screws to secure the second electronic device housing to the stator housing.

[0032] Optionally, the second electronic device housing may include at least one guide hole for receiving at least one screw, wherein the second electronic device housing includes a conductive element at the guide hole for electrically connecting at least one screw and a ground contact of the second PCB, wherein fastening at least one screw presses the conductive element onto the ground contact of the second PCB.

[0033] According to another aspect of this disclosure, a pump motor is provided, the pump motor including a power plug for insertion into a power outlet, the power outlet being defined by a second electronic device housing, wherein the power plug includes:

[0034] - At least one crimp connector, the at least one crimp connector having a mating end facing the power socket and a crimping end opposite the mating end,

[0035] - At least one screw terminal element, the at least one screw terminal element having a first socket and a second socket, and

[0036] -At least one cable,

[0037] In this embodiment, the crimp end of each crimp connector is inserted into a first socket of at least one screw terminal element, and each cable is inserted into a second socket of at least one screw terminal element.

[0038] When the cable is directly crimped to the crimp connector, this particular power plug provides an optional feature that allows the power plug to be used without at least one screw terminal element, which can be used as an intermediary between the cable and the crimp connector if the service personnel have easy access to connect and disconnect the cable from the screw terminal element.

[0039] Optionally, the power socket is located on the lateral side of the second electronic device housing.

[0040] Optionally, each cable may be selectively connected to the crimp connector by either directly crimping the cable to the crimp end, securing the crimp end of each crimp connector to a first socket of at least one screw terminal by a first screw, or securing the cable to a second socket of at least one screw terminal element by a second screw. Attached Figure Description

[0041] Embodiments of this disclosure will now be described by way of example with reference to the following figures, in which:

[0042] Figure 1 A perspective view of an embodiment of a pump according to the present disclosure is shown;

[0043] Figure 2 yes Figure 1 A half-sectional perspective view of the embodiment shown in the figure;

[0044] Figure 3 yes Figure 1 and Figure 2 A half-sectional side view of the embodiment shown in the figure;

[0045] Figure 4 It shows Figures 1-3 An exploded view of the components of the embodiment shown in the figure;

[0046] Figure 5 An exploded view of a second electronic device housing according to the present disclosure is shown;

[0047] Figures 6a-6c An exploded view of embodiments of power plugs in different configurations according to this disclosure is shown. Detailed Implementation

[0048] Figure 1 A compact pump motor 1 according to this disclosure is shown. For ease of technical description, a local right-handed Cartesian coordinate system is illustrated, in which the rotor axis L of the pump motor 1 extends along the z-axis, the transverse axis extends along the x-axis, and the vertical axis extends along the y-axis. Note that the local Cartesian coordinate system can have any spatial orientation, depending on how the pump motor 1 is actually arranged. However, for ease of technical description, spatial terms such as "vertical," "up," "down," "forward," "backward," "front," "backward," "left," or "right" refer to the viewpoint of the pump motor 1 in the negative z-direction. Thus, the positive z-axis represents the forward direction, the positive x-axis represents the transverse direction to the right, and the positive y-axis represents the upward direction.

[0049] Pump motor 1 includes rotor 2 (see...) Figure 4 The rotor 2 is mounted to a drive shaft extending along the rotor axis L. The rotor 2 is circumferentially surrounded by a stator (not visible), which is enclosed by a stator housing 5. Figure 5 It includes a first axial end facing forward and a second axial end facing backward. The pump motor 1 also includes a mounting bracket 7 or foot for mounting the pump motor 1 to an external body (e.g., floor, wall, or ceiling). The mounting bracket 7 is secured to the underside of the stator housing 5. The left lateral side of the stator housing 5 includes transverse stator housing cooling ribs 9 extending substantially parallel to the rotor axis L. The right lateral side of the stator housing 5... Figure 1 It is not visible in the middle, but includes transverse stator housing cooling ribs 9 that extend substantially parallel to the rotor axis L.

[0050] The pump motor 1 also includes a first electronics housing 11 located on the upper side of the stator housing 5. The electronics housing 11 includes an opening 13 through which a power plug 15 is inserted. The opening 13 is located on the left lateral side of the rear portion 35 of the first electronics housing 11. Slightly forward of the opening 13, a signal connector 17 is located on the left lateral side of the electronics housing 11. In the forward section of the electronics housing 11, the left lateral side also defines a cooling inlet 19 into which cooling air is drawn in by a cooling fan 39 (see [link to cooling inlet]). Figure 4The rear axial end of the pump motor 1 is defined by a fan shroud 21, which includes a fully enclosed axial front 23. The fan shroud 21 directs airflow toward a cooling outlet 25, which is oriented to guide cooling air forward along the transverse stator housing cooling ribs 9 on the left and right lateral sides of the stator housing 5.

[0051] Figure 2 The cooling airflow is described in more detail. The cooling airflow enters the pump motor 1 at a transverse cooling inlet 19, defined by a first electronic device housing 11. The first electronic device housing 11 houses a first printed circuit board (PCB) (not shown), which is thermally coupled to an internal heat sink 27 disposed between the first PCB and the upper side of the stator housing 5. The first PCB extends in a horizontal xz plane, and the heat sink 27 includes heat sink cooling ribs 29 that extend in the horizontal xz plane and face the upper side of the stator housing 5. The upper side of the stator housing 5 includes stator housing cooling ribs 31 facing the heat sink 27. The heat sink cooling ribs 29 and the stator housing cooling ribs 31 complement each other to define an inlet flow path 33. The inlet flow path 33 follows a curved path from the transverse cooling inlet 19 toward the rear of the first electronic device housing 11. The rear portion of the first electronic device housing 11 defines a protrusion 35 that axially protrudes beyond the rear axial end of the stator housing 5. The protrusion 35 includes a radially inward (i.e., downward) opening 37 through which cooling airflow passes radially inward toward a drive shaft 3 that protrudes rearward from the rear axial end of the stator housing 5. A cooling fan 39 is mounted to the rear axial end of the drive shaft 3 and draws in cooling airflow through a central axial channel 41 that extends axially between the rear axial end of the stator housing 5 and the cooling fan 39, and circumferentially surrounds the drive shaft 3. The cooling fan 39 is a radial fan that drives the cooling air radially outward. The fan shroud 21 then redirects the cooling airflow forward along the left and right transverse sides of the stator housing 5, wherein the cooling airflow exits the pump motor 1 at a cooling flow outlet 25 to pass along the transverse stator housing cooling ribs 9. It should be noted that the cooling airflow through pump motor 1 is entirely internal between the cooling airflow inlet 19 and the cooling airflow outlet 25.

[0052] The first electronic device housing 11 includes a first housing portion 43 that is radially inward (i.e., lower) and a second housing portion 45 that is radially outward (i.e., upper). The first housing portion is thermally coupled to the stator housing 5. In fact, the first housing portion 43 is integrally molded as part of the stator housing 5 and is therefore made of the same metallic material. In contrast, the second housing portion 45 is made of plastic and is thermally decoupled from both the first housing portion 43 and the stator housing 5. The second housing portion 45 includes a first PCB with power electronic devices and a heat sink 27. The second housing portion 45 includes a base portion 46 and a cover portion 48, wherein the base portion 46 serves as a thermal barrier between the first housing portion 43 and the cover portion 48. The first PCB and the heat sink 27 are mounted to the base portion 46, while the cover portion 48 covers the electronic devices on the first PCB. Figure 3 As seen in the diagram, the radiator cooling rib 29 and the stator housing cooling rib 31, which jointly define the inlet flow path 31, are thermally decoupled from each other by a distance R. Preferably, the distance R is less than 20% of the height H1 of the radiator cooling rib 29, i.e., R ≤ 0.2·H1. The corresponding stator housing cooling rib 31 has a height H2, which is significantly smaller than the height H2 of the radiator cooling rib 29, i.e., H2 ≤ H1. In practice, the stator housing cooling rib 31 is optional, so that the inlet flow path 31 can be defined solely by the radiator cooling rib 29. However, it is worth noting that due to the distance R, there is a very limited or no heat flow between the radiator 27 and the stator housing 5. Therefore, the radiator 27 and the stator housing 5 are independently cooled by specific portions of the cooling airflow along the curved inlet flow path 31. This prevents undesirable heat transfer from the hot stator housing 5 to the radiator 27, which would reduce the ability of the radiator 27 to cool the power electronics on the first PCB. Due to the greater height H1 of the heat sink cooling fins 29, a significant portion of the cooling capacity of the cooling airflow along the curved inlet flow path 31 is used to cool the heat sink 27, thereby cooling the power electronic devices on the first PCB.

[0053] Figure 4 The exploded view shown illustrates a second electronic component housing 47, which is positioned at the rear axial end of the stator housing 5 below the protrusion 35 of the first electronic component housing 11. The second electronic component housing 47 houses the second PCB 51 (see [reference]). Figure 5The second electronic housing 47 completely surrounds the drive shaft 3. A central axial channel 41 through which the drive shaft 3 extends is defined. The diameter of the central axial channel 41 is significantly larger than the diameter of the drive shaft 3 extending through it. Thus, the central axial channel 41 defines a cooling fan inlet for the cooling fan 39. When fully assembled, the upper portion of the second electronic housing 47 protrudes at least partially into the protrusion 35 of the first electronic housing 11. The second electronic housing 47 also includes a power socket 49 located on the left lateral side of the upper portion of the second electronic housing 47 protruding into the first electronic housing 11. When fully assembled, the power socket 49 is located at the opening 13 of the first electronic housing 11, allowing a power plug 15 to be inserted into the power socket 49 through the opening 13 of the first electronic housing 11. The second electronic housing 47 also defines a vertical cooling airflow path from the lower opening 37 in the protrusion 35 of the first electronic housing 11 toward the central axial channel 41. The second electronic component housing 47 is a pre-assembly unit that can be installed onto the rear axial end of the stator housing 5, such as... Figure 4 As shown.

[0054] Figure 5 The second electronics housing 47 is shown in more detail in an exploded view. The second electronics housing 47 defines an annular internal volume surrounding a central axial channel 41, within which the second PCB 51 is disposed. The second PCB 51 extends in an xy-plane perpendicular to the rotor axis L. The second PCB 51 also includes a hole 56 through which the central axial channel 41 passes, and through which the drive shaft 3 extends when the pump motor 1 is fully assembled. The second PCB 51 includes a large electronic assembly 52 for line filters or EMI filters to reduce electromagnetic interference. The line filter electronics of the second PCB 51 are connected to a power plug via an input cable 53. The second PCB 51 also includes an output connector 54 located at the upper end of the second PCB 51, facing a protrusion 35 of the first electronics housing 11. Electronics on the first PCB in the first electronics housing 51 are powered through connection to the output connector 54 of the second PCB 51. A grounding connector element 55 provides a ground connection between the ground of the power socket 49 and the grounds of both the second PCB 51 and the stator housing 5.

[0055] Figure 4Four axially extending mounting screws 57 are shown for securing the second electronic housing 47 to the rear axial end of the stator housing 5. The longer of the four mounting screws 57 provides a grounding connection between the second PCB 51 and the stator housing 5. When the second electronic housing 47 is mounted to the rear axial end of the stator housing 5, a guide hole 61 in the second electronic housing 47 receives the screw 57. The mounting screw 57 also passes through a hole 63 in the second PCB 51. An annular contact surface 65 is provided around the hole 63 on both the front and rear sides of the second PCB 51. The second electronic housing 47 also includes a cover element 67, which also includes a hole 69 through which the mounting screw 57 extends. The hole 69 of the cover element 67 is surrounded by a connector sleeve 71 to establish electrical contact between the head of the mounting screw 57 and the annular contact surface 65 of the hole 63 around the rear side of the second PCB 51. Connector element 55 is an angled rigid metal structure having a first end 73 defining a grounded power socket 49 and a second end 75 including a hole 77 through which a mounting screw 57 extends. The second end 75 of connector element 55 connects to an annular connector surface 65 surrounding the hole 63 at the front side of the second PCB 51. The tip of the mounting screw 57 is screwed into the metal threads of the stator housing 5. Thus, when the second electronic housing 47 is fully assembled and mounted to the rear axial end of the stator housing 5, the mounting screw 57 presses all connecting elements 71, 65, 75 together in a sandwich manner to provide an electrical grounding contact.

[0056] Figures 6a-6c The power plug 15 is shown in more detail in two different configurations. The power plug 15 includes an angled plug housing 79 from which a cable (not shown) extends substantially vertically. An isolating element 81 of the power plug 15 separates the different phases and defines a pin configuration for inserting the power plug 15 into a power socket 49 of a corresponding shape. For each phase of the power plug 15, i.e., in this example including four grounded phases, the power plug 15 includes a crimp connector 83 having a mating end 85 facing the power socket 49 and a crimping end 87 opposite the mating end 85. The mating end is delivered into an associated opening in the isolating element 81. The power plug 15 provides two alternative configuration options for connecting a line of power cable to the crimping end 87 of the crimp connector 83.

[0057] like Figure 6a As shown, the cable (not shown) can be directly crimped to the crimp end 87 of the crimp connector 83. The power plug 15 provides additional options via a screw terminal element 89 including a first socket 91 and a second socket 93. Therefore, in... Figure 6b and Figure 6cIn the second configuration shown, the cable can be indirectly connected to the crimp connector 83 via the screw terminal element 89, wherein the crimp end 87 of each crimp connector 83 is inserted into the first socket 91 of the screw terminal element 89, and wherein each cable is inserted into the second socket 93 of the screw terminal element 89. This facilitates maintenance personnel in performing maintenance tasks.

[0058] The different aspects of this disclosure, individually or in any combination thereof, contribute to providing a more compact and quieter pump motor that is faster and cheaper to assemble.

[0059] In the foregoing description, when reference is made to an element or component having known, obvious, or foreseeable equivalents, such equivalents are incorporated herein as if described separately. The true scope of this disclosure should be determined with reference to the claims, which should be construed as covering any such equivalents. The reader will also understand that elements or features of this disclosure described as optional, preferred, advantageous, convenient, etc., are optional and do not limit the scope of the independent claims.

[0060] The above embodiments should be understood as illustrative examples of this disclosure. It should be understood that any feature described with respect to any embodiment may be used alone or in combination with other described features, and may also be used in combination with one or more features of any other embodiment, or in any combination of any other embodiment. While at least one exemplary embodiment has been shown and described, it should be understood that other modifications, substitutions, and alternatives will be apparent to those skilled in the art, and changes may be made without departing from the scope of the subject matter described herein, and this application is intended to cover any adaptations or variations of the specific embodiments discussed herein.

[0061] Furthermore, "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. Additionally, features or steps described with reference to one of the exemplary embodiments described above may also be used in combination with other features or steps of the other exemplary embodiments described above. Method steps may be applied in any order or in parallel, or may constitute part of or a more detailed version of another method step. It should be understood that all such reasonable and appropriate modifications should be included within the scope of the patents given herein, all of which fall within the scope of contribution to the art. Such modifications, substitutions, and alternatives may be made without departing from the spirit and scope of this disclosure, the spirit and scope of which should be determined by the appended claims and their legal equivalents.

[0062] List of reference numerals

[0063] 1. Pump motor

[0064] 2 rotors

[0065] 3 drive shafts

[0066] 5. Stator Housing

[0067] 7. Mounting bracket

[0068] 9. Stator housing cooling ribs

[0069] 11 First electronic device housing

[0070] 13 Opening

[0071] 15 Power plug

[0072] 17 Signal Connector

[0073] 19 Cooling inlet

[0074] 21 Fan Cover

[0075] 23 Front

[0076] 25 Cooling air outlet

[0077] 27 Internal radiator

[0078] 29 Radiator cooling fins

[0079] 31 Stator housing cooling ribs

[0080] 33. Inlet Flow Path

[0081] 35. Protrusion

[0082] 39 Cooling Fan

[0083] 41. Central Axial Channel

[0084] 43 First shell section

[0085] 45 Second shell section

[0086] 46. ​​Base portion of the second shell section

[0087] 47 Second electronic device housing

[0088] 48. Cover portion of the second housing part

[0089] 49 Power socket

[0090] 51 Second PCB

[0091] 52 Electronic components of line filters

[0092] 54 Output Connectors

[0093] 55 Connector Components

[0094] 56 holes

[0095] 57 Mounting screws

[0096] 61 Guide Hole

[0097] 63 Holes in the Second PCB

[0098] 65 Connecting Surface

[0099] 67 Cover Components

[0100] 69. Holes in the cover element

[0101] 71 Connector sleeve

[0102] 73 The first end of the connector element

[0103] 75 The second end of the connector element

[0104] 77. Holes in connector components

[0105] 79 Power plug housing

[0106] 81 Isolation Element

[0107] 85 Plug-in terminal

[0108] 89 Screw terminal components

[0109] 91 First socket

[0110] 93 Second socket

[0111] L rotor axis

[0112] R distance

[0113] H1 Height of Radiator Cooling Rims

[0114] H2 Height of stator housing cooling ribs

Claims

1. A pump motor (1), comprising: - Rotor (2), said rotor (2) is mounted to a drive shaft (3) extending along the rotor axis (L), wherein said rotor (2) is circumferentially surrounded by the stator, - Stator housing (5), the stator housing (5) surrounding the stator, wherein the stator housing (5) includes a first axial end and a second axial end, - Electronic device, the electronic device being used to power and control the operation of a motor, wherein a first part of the electronic device is disposed on a first PCB, a second part of the electronic device is disposed on a second PCB (51), and - A first electronic device housing (11) is provided to house the first PCB, wherein the first electronic device housing (11) is disposed at the periphery of the stator housing (5). Its characteristics are: It also includes a second electronic device housing (47) that houses the second PCB (51), wherein the second electronic device housing (47) is arranged at the second axial end of the stator housing (5), wherein the second electronic device housing (47) at least partially surrounds the drive shaft (3). The second electronic device housing (47) defines a central axial channel (41), through which the drive shaft (3) extends. The central axial channel defines a cooling fan inlet for mounting a cooling fan (39) to the drive shaft (3).

2. The pump motor (1) according to claim 1, wherein, The first part of the electronic device includes power electronic devices, and the second part of the electronic device includes a line filter.

3. The pump motor (1) according to claim 1, wherein, The drive shaft (3) protrudes from the first axial end of the stator housing (5) to drive the pump, and the drive shaft (3) protrudes from the second axial end of the stator housing (5) to drive the cooling fan (39).

4. The pump motor (1) according to claim 1 further includes a cooling fan (39) mounted to the drive shaft (3), wherein, The second electronic device housing (47) is axially arranged between the cooling fan (39) and the second axial end of the stator housing (5).

5. The pump motor (1) according to claim 1 further includes a cooling fan (39) and a fan shroud (21), wherein, The cooling fan (39) is a radial fan, which is axially arranged between the fan shroud (21) and the second electronic device housing (47), wherein the fan shroud (21) is configured to axially guide the cooling fan outlet flow along the lateral side of the second electronic device housing (47) toward the lateral cooling ribs (9) of the stator housing (5) extending axially.

6. The pump motor (1) according to claim 5, wherein, The fan shroud (21) includes a fully enclosed axial front (23).

7. The pump motor (1) according to claim 1, wherein, The second electronic device housing (47) includes an output connector (54) facing the first electronic device housing (11).

8. The pump motor (1) according to claim 1, wherein, The second electronic device housing (47) can be installed as a pre-assembly unit onto the second axial end of the stator housing (5).

9. The pump motor (1) according to claim 1, wherein, The second PCB (51) extends in a plane (xy) perpendicular to the rotor axis (L) and includes a first hole (56) through which the drive shaft (3) extends.

10. The pump motor (1) according to claim 1, wherein, The inlet flow path (33) is defined between the first electronic device housing (11) and the stator housing (5).

11. The pump motor (1) according to any one of claims 1 to 10, wherein, The first electronic device housing (11) includes a first housing portion (43) and a second housing portion (45), wherein the first housing portion (43) is thermally coupled to the stator housing (5), and wherein the second housing portion (45) including the first PCB is thermally decoupled from the first housing portion (43) and from the stator housing (5).

12. The pump motor (1) according to claim 11, wherein, The first housing portion (43) is arranged closer to the rotor axis (L) than the second housing portion (45).

13. The pump motor (1) according to claim 11, wherein, The first housing portion (43) includes a first material having a first thermal conductivity, and the second housing portion (45) includes a second material having a second thermal conductivity, wherein the first thermal conductivity is higher than the second thermal conductivity.

14. The pump motor (1) according to any one of claims 1 to 10, wherein, The first PCB is thermally coupled to a heat sink (27), which is disposed between the first PCB and the stator housing (5). The heat sink (27) includes heat sink cooling ribs (29) facing the stator housing (5). The stator housing (5) includes stator housing cooling ribs (31) facing the heat sink (27). The heat sink cooling ribs (29) and the stator housing cooling ribs (31) complement each other to define an inlet flow path (33) toward a cooling fan inlet defined by the second electronic device housing (47).

15. The pump motor (1) according to claim 14, wherein, The radiator cooling rib (29) and the stator housing cooling rib (31) are thermally decoupled from each other by a distance (R).

16. The pump motor (1) according to claim 14, wherein, The radiator cooling rib (29) and the stator housing cooling rib (31) define a curved inlet flow path (33) from the transverse flow path inlet (19) toward the second axial end of the stator housing (5).

17. The pump motor (1) according to any one of claims 1 to 10, wherein, The first electronic device housing (11) includes a protrusion (35) that axially protrudes beyond the second axial end of the stator housing (5), wherein the protrusion (35) receives at least a portion of the second electronic device housing (47).

18. The pump motor (1) according to any one of claims 1 to 10, wherein, The first electronic device housing (11) defines a lateral flow path inlet (19) and a flow path outlet (37) oriented toward the second electronic device housing (47).

19. The pump motor (1) according to any one of claims 1 to 10, wherein, The second electronic device housing (47) is fixed to the stator housing (5) by at least one conductive screw (57), wherein the at least one screw (57) connects the ground of the second PCB (51) to the stator housing (5).

20. The pump motor (1) according to claim 19, wherein, The second PCB (51) includes at least one second hole (63) through which at least one screw (57) protrudes, wherein the second PCB (51) includes a ground contact (65) surrounding the second hole (63).

21. The pump motor (1) according to claim 20, wherein, The second electronic device housing (47) includes at least one guide hole (61) for receiving the at least one screw (57), wherein the second electronic device housing (47) includes a conductive element (55) at the guide hole (61) for providing a ground connection to the ground contact (65) of the second PCB (51), wherein fastening the at least one screw (57) presses the conductive element (55) onto the ground contact (65) of the second PCB (51).

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