Description

[01 ] The present disclosure relates generally to pump motors, i.e. pump motors typically used to drive any kind of pumps, in particular speed- controlled multistage or single-stage centrifugal pumps. Preferably, the pump motor is par† of a pump assembly including the pump. The present disclosure is particularly applicable for pump motors with a power above 0.7 kW.

[02] Typically, pump motors comprise a s†a†or housing accommodat ing a s†a†or embracing a rotor being mounted on a rotor shat†. The rotor shat† extends along a rotor axis and protrudes ou† of a drive-end of the s†a†or housing †o drive an impeller of a pump. I† is known, e.g. from WO 2013/135465 A1 , †o arrange a cooling fan a† a non-drive-end of the s†a†or housing, so †ha† cooling airflows along the axially extending lateral cool ing ribs of the s†a†or housing. The cooling fan is typically driven by the rotor shat† protruding ou† of the non-drive-end of the s†a†or housing.

[03] In WO 2013/135465 Al, an electronics housing is mounted †o a pe rimeter of the s†a†or housing. The electronics housing accommodates the control electronics for controlling the motor operation, i.e. the control elec tronics comprise a frequency converter for controlling the motor speed. During motor operation, the control electronics generate hea† †ha† must be dissipated †o avoid damage and malfunction of the electronics. WO 2013/135465 Al suggests †ha† the electronics housing project beyond the non-drive end of the s†a†or housing for receiving par† of the radial flow of the cooling fan and thus cooling the control electronics within the elec- ironies housing. [04] However, the solution of WO 2013/135465 A 1 has the disadvantage that the electronics housing is relatively large compared †o the stator hous ing. Previous attempts †o reduce the size of the electronics housing en countered limits set by the requirement of sufficient heat dissipation of the control electronics.

[05] It is thus a problem of the present disclosure †o provide a more com pact pump motor with sufficient cooling of the control electronics.

[06] In accordance with a firs† aspect of the present disclosure, a pump motor is provided, wherein the pump motor comprises a rotor mounted †o a drive shat† extending along a rotor axis, wherein the rotor is circumferentially embraced by a s†a†or, a s†a†or housing enclosing the s†a†or, wherein the s†a†or housing comprises a firs† axial end and a second axial end, electronics for powering and controlling the motor operation, wherein a firs† portion of the electronics are arranged on a firs† PCB and a second portion of the electronics are arranged on a second PCB, and a firs† electronics housing accommodating the firs† PCB, wherein the firs† electronics housing is arranged a† a perimeter of †he s†a†or housing.

Furthermore, the pump motor comprises a second electronics housing accommodating the second PCB, wherein the second electronics hous ing is arranged a† the second axial end of the s†a†or housing, wherein the second electronics housing a† leas† partially rings the drive shat†.

[07] The term “rings” or “ringing” shall mean herein †ha† the drive shat† is a† leas† partially circumferenced by an outer surface of the second electronics housing. In other words, the drive shat† protrudes through the second electronics housing without protruding into the inner volume of the second electronics housing. [08] Optionally, the first portion of the electronics may comprise power electronics and the second portion of the electronics may comprise a line filter. Preferably, the electronics comprises a frequency converter for controlling the motor speed. The power electronics may comprise the inverter circuitry of the frequency converter generating a substantial amount of heat during motor operation. Components that generate less heat, such as the rectifier circuitry or the DC link of the frequency con verter, are preferably arranged on the first PCB. However, the rectifier circuitry and/or the DC link may alternatively be arranged on the second PCB in the second electronics housing. The line filter being connected to an input side of the rectifier circuitry is preferably arranged on the second PCB in the second electronics housing, because the quite bulky compo nents thereof allow for a smaller design of the first electronics housing. Furthermore, the components of the line filter also generate substantial heat that must be dissipated to avoid any damage to the electronics.

[09] Optionally, the drive shaft may protrude out of the first axial end of the stator housing for driving a pump, and the drive shaft may protrude out of the second axial end of the stator housing for driving a cooling fan. In other words, the second electronics housing is arranged at a non drive end of the pump motor and a pump is coupled to the drive end of the pump motor. Preferably, the pump motor may further comprise a cooling fan being mounted to the drive shaft, wherein the second elec tronics housing is arranged axially between the cooling fan and the sec ond axial end of the stator housing. This has the advantage that the outer surface of the second electronics housing is cooled by the air flow driven by the cooling fan.

[10] Optionally, the pump motor may further comprise a fan cover, wherein the cooling fan is a radial fan being arranged axially between the fan cover and the second electronics housing, wherein the fan cover is configured †o guide a cooling fan outlet flow axially along lateral sides of the second electronics housing towards axially extending lateral stator housing cooling ribs. Preferably, the fan cover may comprise a fully closed axial front face. This has the advantage that noise generated by the pump motor is significantly absorbed by the cooling fan cover. The pump motor is thus significantly less noisy.

[1 1 ] Optionally, the second electronics housing may define a central axial channel through which the drive shaft extends. Preferably, such a channel may define a cooling fan suction inlet for the cooling fan that is mounted to the drive shaft. Thus, the radial cooling fan does not suck in air through the closed axial front face, but through the central axial channel of the second electronics housing. Therefore, the cooling fan and the fan cover guide the cooling air flow along a 180° turn, which uses the inlet flow as well as the outlet flow of the cooling fan for cooling the components of the pump motor. The inlet flow is predominantly used for cooling the electronics, whereas the outlet flow is predominantly used for cooling the stator housing.

[12] Optionally, the second electronics housing comprises an output connection facing towards the first electronics housing. The output con nection may be a wired connection and/or a plug-socket connection.

[13] Optionally, the second electronics housing may be mountable to the second axial end of the stator housing as a preassembled unit. This facilitates and speeds up the assembling process of the motor pump.

[14] Optionally, the second PCB may extend in a plane perpendicular to the rotor axis and may comprise a hole through which the drive shaft extends. The second electronics housing may thus define an essentially donut-shaped inner volume, in which the second PCB is arranged in form of an annular-shaped plane perpendicular to the rotor axis. This arrangement further reduces the space consumption and allows for a very compact design of the pump motor.

[15] Optionally, inlet flow paths are defined between the firs† electron ics housing and the s†a†or housing. Therefore, the inlet flow of the cooling fan cools both the s†a†or housing and the components of the firs† elec tronics housing before it reaches, through the central axial channel de fined by the second electronics housing, the cooling fan. The radial cool ing fan then drives the outlet flow radially outward, where the fan cover redirects the outlet flow axially along lateral sides of the ribbed s†a†or housing.

[16] Optionally, the firs† electronics housing may comprise a firs† hous ing par† and a second housing par†, wherein the firs† housing par† is ther mally coupled †o the s†a†or housing, and wherein the second housing par† comprising the firs† PCB is thermally decoupled from the firs† housing part and from the s†a†or housing. Preferably, the firs† housing part may be made of the same metallic material †ha† the s†a†or housing is made of. The firs† housing par† may even be integrally moulded as a par† of the s†a†or housing. Preferably, the firs† housing par† may be arranged closer †o the rotor axis than the second housing par†.

[17] Optionally, the firs† housing part may comprise a firs† material hav ing a firs† thermal conductivity, and the second housing par† may com prise a second material having a second thermal conductivity, wherein the firs† thermal conductivity is significantly higher than the second ther mal conductivity. For instance, the firs† material may be metal and the second material may be plastic.

[18] Optionally, the firs† PCB may be thermally coupled †o a hea† sink being arranged between the firs† PCB and the s†a†or housing, wherein the hea† sink comprises hea† sink cooling ribs facing towards the s†a†or housing, wherein the stator housing comprises stator housing cooling ribs facing towards the heat sink, wherein the heat sink cooling ribs and the stator housing cooling ribs complement each other †o define inlet flow paths towards a cooling fan suction inlet defined by the second elec- ironies housing. Preferably, the inlet flow paths follow a curved path with an inlet arranged a† a lateral side of the firs† electronics housing and an outlet arranged axially within the firs† electronics housing.

[19] Optionally, the heat sink cooling ribs and the stator housing cool- ing ribs are thermally decoupled from each other by a distance. There fore, the heat sink cooling ribs and the stator housing cooling ribs are close enough †o each other †o define the inlet flow paths, bu† have a distance †o each other large enough †o reduce a hea† transfer between the hea† sink cooling ribs and the s†a†or housing cooling ribs. Therefore, the hea† sink cooling ribs and the s†a†or housing cooling ribs may have different temperature, because the hea† sink cooling ribs predominantly dissipate hea† generated by the power electronics of the firs† PCB and the s†a†or housing cooling ribs predominantly dissipate hea† generated by the s†a†or. The thermal decoupling between the hea† sink cooling ribs and the s†a†or housing cooling ribs reduces in particular the risk of a hea† transfer from ho† s†a†or housing cooling ribs †o the hea† sink cooling ribs, which would reduce their capacity †o dissipate the hea† generated by the power electronics. The thermal decoupling effectively allows for a more compact design of the firs† electronics housing, because both the hea† sink cooling ribs and the s†a†or housing cooling ribs are cooled in dependent from each other by the same inlet flow along the inlet flow paths they define together.

[20] Optionally, the hea† sink cooling ribs and the s†a†or housing cool- ing ribs define curved inlet flow paths from a lateral flow path inlet to wards the second axial end of the s†a†or housing. The curved inlet flow paths are beneficial for the hea† dissipating effect of the cooling inflow. [21 ] Optionally, the first electronics housing may comprise a projecting portion projecting axially beyond the second axial end of the stator hous ing, wherein the projecting portion receives at least a portion of the sec ond electronics housing. In other words, the first electronics housing and the second electronics housing may define together an L-shape, along which there is an internal inlet flow path along the L-shape between the two electronics housings and the stator housing. A first leg of the L-shape extends axially between the first electronics housing and the stator hous ing and a second leg of the L-shape extends radially between the sec ond electronics housing and the stator housing.

[22] Optionally, the first electronics housing may define an outer lateral flow path inlet and an inner flow path outlet directed towards the sec ond electronics housing. Thus, there is a radially inward flow at the axial side of the second electronics housing that faces towards the stator housing.

[23] Optionally, the second electronics housing may be fixed to the stator housing by at least one electrically conducting screw, wherein said at least one screw electrically connects a ground of the second PCB to the stator housing. This is a very efficient way to fix the electronics housing to the stator housing and to provide an electrical ground for both the second PCB and the stator housing.

[24] Optionally, the second electronics housing may comprise a power connector at a lateral side of the second electronics housing, so that the first PCB in the first electronics housing is powered via the second PCB in the second electronics housing. Preferably, the first housing part of the first electronics housing may comprise a lateral opening through which a power plug may be connected to the power connector of the second electronics housing. The power plug is preferably angled in order †o contribute †o the overall compact design of the pump motor.

[25] Optionally, the second electronics housing may a† leas† partially protrude into the firs† electronics housing.

[26] Optionally, the second PCB may comprise a† leas† one hole through which the a† leas† one screw protrudes, wherein the second PCB comprises a ground contact around the hole. This is a very efficient way †o provide the ground contact by the screw †ha† fixes the second elec tronics housing †o the s†a†or housing.

[27] Optionally, the second electronics housing may comprise a† leas† one pilot hole for receiving the a† leas† one screw, wherein the second electronics housing comprises an electrically conducting element a† the pilot hole for electrically connecting the a† leas† one screw and the ground contact of the second PCB, wherein tightening the a† leas† one screw presses the electrically conducting element onto the ground con tact of the second PCB.

[28] According †o another aspect of the present disclosure, a pump motor is provided comprising a power plug for plugging into a power socket defined by the second electronics housing, wherein the power plug comprises a† leas† one crimp connector having a plugging end facing to wards the power socket and a crimping end opposite the plug ging end, a† leas† one screw terminal element having a firs† receptable and a second receptable, and a† leas† one cable wire, wherein the crimping end of each crimp connector is inserted into the firs† receptable of one of the a† leas† one screw terminal element, and wherein each cable wire is inserted into the second receptable of one of the at least one screw terminal element.

[29] This specific power plug provides a selective option to use the power plug without the at least one screw terminal element when the cable wire is crimped directly to the crimp connector and to use the screw terminal element as an intermediary between the cable wire and the crimp connector if service personnel shall be given the opportunity to easily connect and disconnect the cable wire from the screw terminal element.

[30] Optionally, the power socket is located at a lateral side of the sec ond electronics housing. [31 ] Optionally, each cable wire is selectively connectable to the crimp connector either by crimping the cable wire directly to the crimp ing end or by a first screw fixing the crimping end of each crimp con nector in the first receptable of one of the at least one screw terminal and by a second screw fixing the cable wire in the second receptable of one of the at least one screw terminal element.

[32] Embodiments of the present disclosure will now be described by way of example with reference to the following figures of which: Fig. 1 shows a perspective view of an embodiment of a pump according to the present disclosure;

Fig. 2 shows a semi-cut perspective view of the embodiment shown in figure 1 ;

Fig. 3 shows a semi-cut sided view of the embodiment shown in figures 1 and 2; Fig. 4 shows an exploded view of components of the embodi ment shown in figures 1 -3;

Fig. 5 shows an exploded view of the second electronics housing according †o the present disclosure;

Fig. 6a-c show exploded views of embodiments of a power plug ac cording †o the present disclosure in different configurations.

[33] Fig. 1 shows a compact pump motor 1 according to the present disclosure. In order to facilitate the technical description of the present disclosure, the figures show a local right-handed Cartesian coordinate system, wherein a rotor axis L of the pump motor 1 extends along the z- axis, a lateral axis extends along the x-axis and a vertical axis extends along the y-axis. Please note that the local Cartesian coordinate system can have any spatial orientation depending on how the pump motor 1 is actually arranged. Plowever, to facilitate the technical description of the present disclosure, spatial terms like “vertical”, “upper”, “lower”, “for ward”, “backward”, “front”, “rear”, “left” or “right” refer to a view on the pump motor 1 in negative z-direc†ion. Therefore, the positive z-axis is de noted as a forward direction, the positive x-axis is denoted as a lateral direction to the right, and the positive y-axis is denoted as an upward direction.

[34] The pump motor 1 comprises a rotor 2 (see figure 4) mounted to a drive shaft 3 extending along the rotor axis L. The rotor 2 is circumferen tially embraced by a stator (not visible) being enclosed by a stator hous ing 5. The stator housing 5 comprises a forward facing first axial end and a rearward facing second axial end. The pump motor 1 further comprises a mounting bracket 7 or foot for mounting the pump motor 1 to an ex ternal body, e.g. a ground floor, wall or ceiling. The mounting bracket 7 is fixed †o a lower side of the sfafor housing 5. A left lateral side of the sfafor housing 5 comprises lateral sfafor housing cooling ribs 9 extending essentially parallel †o the rotor axis L. A right lateral side of the stator hous ing 5 is not visible in figure 1, but comprises analogously lateral stator housing cooling ribs 9 extending essentially parallel to the rotor axis L.

[35] The pump motor 1 further comprises a first electronics housing 11 at an upper side of the stator housing 5. The electronics housing 1 1 com prises an opening 13 through which a power plug 15 is plugged in. The opening 13 is arranged at a left lateral side of a rear portion 35 of the first electronics housing 1 1. Slightly more forward next to the opening 13, a signal connector 17 is arranged at the left lateral side of the electronics housing 1 1 . In a forward section of the electronics housing 11 , the left lateral side of the electronics housing 11 further defines a cooling flow inlet 19, into which cooling air is sucked in by a cooling fan 39 (see figure 4). The axial rear end of the pump motor 1 is defined by a fan cover 21 comprising a fully closed axial front face 23. The fan cover 21 guides the air flow towards cooling flow outlets 25 directed at the left and right lat eral sides of the stator housing 5 guiding the cooling air outflow forward along the lateral stator housing cooling ribs 9.

[36] Figure 2 describes the cooling air flow in more detail. The cooling air flow enters the pump motor 1 at the lateral cooling flow inlet 19 de fined by the first electronics housing 1 1. The first electronics housing 11 accommodates a first printed circuit board (PCB) (not shown) that is ther mally coupled to an internal heat sink 27 being arranged between the first PCB and an upper side of the stator housing 5. The first PCB extends in the horizontal xz-plane and the heat sink 27 comprises heat sink cool ing ribs 29 extending in the horizontal xz-plane and facing towards the upper side of the stator housing 5. The upper side of the stator housing 5 comprises stator housing cooling ribs 31 facing towards the heat sink 27. The heat sink cooling ribs 29 and the stator housing cooling ribs 31 complement each other to define inlet flow paths 33. The inlet flow paths 33 follow a curved path from the lateral cooling flow inlet 19 towards a rear portion of the firs† electronics housing 1 1 . The rear portion of the firs† electronics housing 11 defines a projecting portion 35 of the firs† electron ics housing 11 projecting axially beyond the rear axial end of the s†a†or housing 5. The projecting portion 35 comprises a radially inward, i.e. downward, facing opening 37 through which the cooling airflow passes radially inward towards the drive shat† 3 projecting backwardly ou† of the rear axial end of the s†a†or housing 5. A cooling fan 39 is mounted †o the rear axial end of the drive shat† 3 and sucks the cooling air flow through a central axial channel 41 extending axially between the axial rear end of the s†a†or housing 5 and the cooling fan 39 and circumferen tially about drive shat† 3. The cooling fan 39 is a radial fan driving the cooling air radially outward. The fan cover 21 then redirects the cooling air flow forward along the let† and right lateral sides of the s†a†or housing 5, where the cooling air flow leaves the pump motor 1 a† the cooling flow outlets 25 for passing along the lateral s†a†or housing cooling ribs 9. It should be noted †ha† the cooling air flow though the pump motor 1 is fully internal between the cooling flow inlet 19 and the cooling flow outlet 25.

[37] The firs† electronics housing 11 comprises a radially inner, i.e. lower, firs† housing part 43 and a radially outer, i.e. upper, second housing par† 45. The firs† housing part is thermally coupled †o the s†a†or housing 5. In fact, the firs† housing part 43 is integrally moulded as part of the s†a†or housing 5 and thus made of the same metallic material. In contras† †o †ha†, the second housing par† 45 is made of plastic and is thermally de coupled from the firs† housing par† 43 and from the s†a†or housing 5. The second housing par† 45 comprises the firs† PCB with the power electronics and the hea† sink 27. The second housing par† 45 comprises a base part 46 and a lid par† 48, wherein the base par† 46 acts as a thermal barrier between the firs† housing par† 43 and the lid part 48. The firs† PCB and the heat sink 27 are mounted to the base part 46, whereas the lid part 48 covers the electronics on the first PCB. As can be seen in figure 3, the heat sink cooling ribs 29 and the stator housing cooling ribs 31 , which de fine together the inlet flow paths 31 , are thermally decoupled from each other by a distance R. The distance R is preferably smaller than 20% of a heigh† Hi of the hea† sink cooling ribs 29, i.e. R £ 0.2 H ₁ . The correspond ing s†a†or housing cooling ribs 31 have a heigh† H2 that is significantly smaller than the heigh† Hi of the hea† sink cooling ribs 29, i.e. H ₂ £ H ₁ . In fact, the s†a†or housing cooling ribs 31 are optional, so †ha† the inlet flow paths 31 may be defined by the hea† sink cooling ribs 29 alone. However, i† is important †o note †ha† there is a very limited or no thermal flow be tween the hea† sink 27 and the s†a†or housing 5 due †o the distance R. Therefore, the hea† sink 27 and the s†a†or housing 5 are cooled inde pendently by certain fractions of the cooling air flow along the curved inlet flow paths 31 . This prevents an undesirable thermal transfer from a ho† s†a†or housing 5 to the hea† sink 27, which would reduce the capacity of the hea† sink 27 to cool the power electronics on the firs† PCB. Due †o the larger heigh† Hi of the hea† sink cooling ribs 29, a larger fraction of the cooling capacity of the cooling air flow along the curved inlet flow paths 31 is used for cooling the hea† sink 27, and thus the power elec tronics on the firs† PCB.

[38] The exploded view shown in figure 4 shows a second electronics housing 47 being arranged a† the rear axial end of the s†a†or housing 5 below the projecting portion 35 of the firs† electronics housing 1 1. The second electronics housing 47 accommodates a second PCB 51 (see figure 5) and fully rings the drive shat† 3. The second electronics housing 47 defines a central axial channel 41 through which the drive shat† 3 ex tends. The diameter of the central axial channel 41 is significantly larger than the diameter of the drive shat† 3 extending through the central axial channel 41. Thereby, the central axial channel 41 defines a cooling fan suction inlet for the cooling fan 39. When fully assembled, the second electronics housing 47 protrudes at least partially with an upper portion of the second electronics housing 47 info the protruding portion 35 of the firs† electronics housing 11 . The second electronics housing 47 further comprises a power socket 49 being located a† a let† lateral side of the upper portion of the second electronics housing 47 protruding into the firs† electronics housing 1 1 . When fully assembled, the power socket 49 is located a† the opening 13 of the firs† electronics housing 1 1 , so †ha† the power plug 15 can be plugged into the power socket 49 through the opening 13 of the firs† electronics housing 11. The second electronics housing 47 further defines a vertical cooling air flow path from the lower opening 37 in projecting portion 35 of the firs† electronics housing 1 1 to wards the central axial channel 41 . The second electronics housing 47 is a pre-assembled uni† †ha† is mountable †o the rear axial end of the s†a†or housing 5 as shown in figure 4.

[39] Figure 5 shows the second electronics housing 47 in an exploded view in more detail. The second electronics housing 47 defines a donut shaped inner volume ringing the central axial channel 41, wherein the second PCB 51 is arranged in said inner volume. The second PCB 51 ex tends in the xy-plane perpendicular †o the rotor axis L. The second PCB 51 further comprises a hole 56 through which the central axial channel 41 and, when the pump motor 1 is fully assembled, the drive shat† 3 ex tends. The second PCB 51 comprises bulky electronics components 52 of a line filter or EMI filter for reducing electromagnetic interference. The line filter electronics of the second PCB 51 is connected †o the power plug via input line cables 53. The second PCB 51 further comprises output con nectors 54 a† an upper end of the second PCB 51 facing towards the projecting portion 35 of the firs† electronics housing 1 1 . The electronics on the firs† PCB in the firs† electronics housing 51 is powered by a connection with the output connectors 54 of the second PCB 51. A ground con nector element 55 provides a ground connection between a ground of the power socket 49 and both the ground of the second PCB 51 and the stator housing 5.

[40] Figure 4 shows four axially extending mounting screws 57 for fixing the second electronics housing 47 to the rear axial end of the sfafor hous ing 5. The longer one of the four mounting screws 57 provides for the ground connection between the second PCB 51 and the sfafor housing 5. A pilot hole 61 of the second electronics housing 47 receives the screw 57 when the second electronics housing 47 is mounted †o the rear axial end of the sfafor housing 5. The mounting screw 57 also passes through a hole 63 in the second PCB 51 . An annular connecting surface 65 is pro vided around the hole 63 af both the forward and backward side of the second PCB 51 . The second electronics housing 47 further comprises a lid element 67 also comprising holes 69 through which the mounting screws 57 extend. The holes 69 of the lid element 67 are surrounded by connect ors sleeves 71 for establishing an electrical contact between a head of the mounting screw 57 and the annular contact surface 65 around the hole 63 a† the backward side of the second PCB 51 . The connector ele ment 55 is an angled rigid metallic structure having a firs† end 73 defining a ground of the power socket 49 and having a second end 75 compris ing a hole 77 through which the mounting screw 57 extends. The second end 75 of the connector element 55 connects †o the annular connector surface 65 around the hole 63 a† the front side of the second PCB 51 . A forward end of the mounting screw 57 is screwed into a metallic thread of the s†a†or housing 5. Thereby, when the second electronics housing 47 is fully assembled and mounted †o the rear axial end of the s†a†or housing 5, the mounting screw 57 presses all connecting elements 71 , 65, 75 to gether in a sandwiched manner for providing an electrical ground con tact.

[41 ] Figures 6a-c show the power plug 15 in more detail and in two different configurations. The power plug 15 comprises an angled plug housing 79, wherein a cable (no† shown) extends essentially vertically ou† of the power plug housing 79. An isolation element 81 of the power plug 15 separates the different phases and defines a pin structure for plugging the power plug 15 into the correspondingly shaped power socket 49. For each phase of the power plug 15, i.e. four phases including ground in this example, the power plug 15 comprises a crimp connection 83 having a plugging end 85 facing towards the power socket 49 and a crimping end 87 opposite the plugging end 85. The plugging end is fed into an associated opening in the isolation element 81 . The power plug 15 pro vides two selectable configuration options for connecting wires of the power cable †o the crimping end 87 of the crimp connector 83.

[42] As shown in figure 6a, the cable wires (no† shown) may be directly crimped †o the crimping end 87 of the crimp connector 83. The power plug 15 provides a further option by comprising a screw terminal element 89 having a firs† receptable 91 and a second receptable 93. Therefore, in a second configuration ay shown in Figs. 6b, c, the cable wires can be indirectly connected †o the crimp connector 83 via the screw terminal element 89, wherein the crimping end 87 of each crimp connector 83 is inserted into the firs† receptable 91 of the screw terminal element 89, and wherein each cable wire is inserted into the second receptable 93 of the screw terminal element 89. This facilitates maintenance tasks †o be per formed by service personnel.

[43] The different aspects of the present disclosure contribute alone or in any combination with each other †o providing a more compact and less noisy pump motor †ha† is quicker and cheaper †o assemble.

[44] Where, in the foregoing description, integers or elements are men tioned which have known, obvious or foreseeable equivalents, then such equivalents are herein incorporated as if individually se† forth. Reference should be made †o the claims for determining the true scope of the present disclosure, which should be construed so as to encompass any such equivalents. It will also be appreciated by the reader that integers or features of the disclosure that are described as optional, preferable, advantageous, convenient or the like are optional and do no† limit the scope of the independent claims.

[45] The above embodiments are †o be understood as illustrative ex amples of the disclosure. I† is †o be understood †ha† any feature de scribed in relation †o any one embodiment may be used alone, or in combination with other features described, and may also be used in combination with one or more features of any other of the embodiments, or any combination of any other of the embodiments. While a† leas† one exemplary embodiment has been shown and described, it should be un derstood †ha† other modifications, substitutions and alternatives are ap parent †o one of ordinary skill in the ar† and may be changed without departing from the scope of the subject matter described herein, and this application is intended †o cover any adaptations or variations of the specific embodiments discussed herein.

[46] In addition, "comprising" does no† exclude other elements or steps, and "a" or "one" does no† exclude a plural number. Furthermore, charac teristics or steps which have been described with reference †o one of the above exemplary embodiments may also be used in combination with other characteristics or steps of other exemplary embodiments de scribed above. Method steps may be applied in any order or in parallel or may constitute a part or a more detailed version of another method step. I† should be understood †ha† there should be embodied within the scope of the paten† warranted hereon all such modifications as reason ably and properly come within the scope of the contribution †o the ar†. Such modifications, substitutions and alternatives can be made without departing from the spirit and scope of the disclosure, which should be determined from the appended claims and their legal equivalents. List of reference numerals

1 pump motor 2 rotor

3 drive shaft

5 stator housing

7 mounting bracket

9 stator housing cooling ribs 1 1 firs† electronics housing

13 opening

15 power plug

17 signal connector

19 cooling flow inlet 21 fan cover

23 front face

25 cooling air outlets

27 internal hea† sink

29 hea† sink cooling ribs 31 s†a†or housing cooling ribs

33 inlet flow paths

35 projecting portion

39 cooling fan

41 central axial channel 43 firs† housing par†

45 second housing par†

46 base part of second housing par†

47 second electronics housing

48 lid par† of second housing par† 49 power socket

51 second PCB

52 electronic components of line filter 54 output connector

55 connector element

56 hole in second PCB

57 mounting screw 61 pilot hole

63 holes in second PCB

65 connecting surface

67 lid element

69 holes in lid element 71 connector sleeves

73 firs† end of connector element 75 second end of connector element 77 hole in connector element

79 power plug housing 81 isolation element

85 plugging end

89 screw terminal element 91 firs† receptable

93 second receptable

L rotor axis

R distance

Hi heigh† of hea† sink cooling ribs

H2 heigh† of s†a†or housing cooling ribs