PUMP MOTOR WITH COOLED TWO-PART ELECTRONIC MODULE

Abstract

A pump motor (1) includes a rotor (2) mounted to a drive shaft (3) extending along a rotor axis (L). The rotor (2) is circumferentially embraced by a stator. A stator housing (5), encloses the stator. The stator housing includes a first axial end and a second axial end. Electronics for powering and controlling the motor operation include a first portion, arranged on a first PCB, and a second portion, arranged on a second PCB (51). A first electronics housing (11) accommodates the first PCB. The first electronics housing (11) is arranged at a perimeter of the stator housing (5). A second electronics housing (47) accommodates the second PCB (51). The second electronics housing (47) is arranged at the second axial end of the stator housing (5). The second electronics housing (47) at least partially rings the drive shaft (3).

Description

Claims

1. A pump motor comprising: a rotor;a stator;a drive shaft extending along a rotor axis, wherein the rotor is mounted to the drive shaft and the rotor is circumferentially embraced by the stator;a stator housing enclosing the stator, wherein the stator housing comprises a first axial end and a second axial end;electronics for powering and controlling motor operation, wherein a first portion of the electronics are arranged on a first PCB and a second portion of the electronics are arranged on a second PCB;a first electronics housing accommodating the first PCB, wherein the first electronics housing is arranged at a perimeter of the stator housing; anda second electronics housing accommodating the second PCB, wherein the second electronics housing is arranged at the second axial end of the stator housing, wherein the second electronics housing at least partially rings the drive shaft.

2. The pump motor according to claim 1, wherein the first portion of the electronics comprises power electronics, and wherein the second portion of the electronics comprises a line filter.

3. The pump motor according to claim 1, wherein the drive shaft protrudes out of the first axial end of the stator housing for driving a pump, and wherein the drive shaft protrudes out of the second axial end of the stator housing for driving a cooling fan.

4. The pump motor according to claim 1, further comprising a cooling fan being mounted to the drive shaft, wherein the second electronics housing is arranged axially between the cooling fan and the second axial end of the stator housing.

5. The pump motor according to claim 1, further comprising: a cooling fan; anda fan cover, wherein the cooling fan is a radial fan that is arranged axially between the fan cover and the second electronics housing, wherein the fan cover is configured to guide a cooling fan outlet flow axially along lateral sides of the second electronics housing towards axially extending lateral cooling ribs of the stator housing.

6. The pump motor according to claim 5, wherein the fan cover comprises a fully closed axial front face.

7. The pump motor according to claim 1, wherein the second electronics housing defines a central axial channel through which the drive shaft extends.

8. The pump motor according to claim 7, wherein the channel defines a cooling fan suction inlet for a cooling fan that is mounted to the drive shaft .

9. The pump motor according to claim 1, wherein the second electronics housing comprises an output connection, wherein the output connection faces towards the first electronics housing.

10. The pump motor according to claim 1, wherein the second electronics housing is mountable to the second axial end of the stator housing as a pre-assembled unit.

11. The pump motor according to claim 1, wherein the second PCB extends in a plane perpendicular to the rotor axis and comprises a hole through which the drive shaft extends.

12. The pump motor according to claim 1, wherein inlet flow paths are defined between the first electronics housing and the stator housing.

13. The pump motor according to claim 1, wherein the first electronics housing comprises a first housing part and a second housing part, wherein the first housing part is thermally coupled to the stator housing, and wherein the second housing part, comprising the first PCB, is thermally decoupled from the first housing part and thermally decoupled from the stator housing.

14. The pump motor according to claim 13, wherein the first housing part is arranged closer to the rotor axis than the second housing part.

15. The pump motor according to claim 13, wherein the first housing part comprises a first material having a first thermal conductivity, and wherein the second housing part comprises a second material having a second thermal conductivity, wherein the first thermal conductivity is significantly higher than the second thermal conductivity.

16. The pump motor according to claim 1, wherein the first PCB is thermally coupled to a heat sink that is arranged between the first PCB and the stator housing, wherein the heat sink comprises heat sink cooling ribs facing towards the stator 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 to define inlet flow paths towards a cooling fan suction inlet defined by the second electronics housing.

17. The pump motor according to claim 16, wherein the heat sink cooling ribs and the stator housing cooling ribs are thermally decoupled from each other by a distance.

18. The pump motor according to claim 16, wherein the heat sink cooling ribs and the stator housing cooling ribs define curved inlet flow paths from a lateral flow path inlet towards the second axial end of the stator housing.

19. The pump motor according to claim 1, wherein the first electronics housing comprises a projecting portion projecting axially beyond the second axial end of the stator housing, wherein the projecting portion receives at least a portion of the second electronics housing.

20. The pump motor according to claim 1, wherein the first electronics housing defines a lateral flow path inlet and a flow path outlet directed towards the second electronics housing.

21. The pump motor according to claim 1, wherein the second electronics housing is 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.

22. The pump motor according to claim 21, wherein the second PCB comprises at least one hole through which the at least one screw protrudes, wherein the second PCB comprises a ground contact around the hole.

23. The pump motor according to claim 22, wherein the second electronics housing comprises at least one pilot hole for receiving the at least one screw, wherein the second electronics housing comprises an electrically conducting element at the pilot hole for providing a ground connection for the ground contact of the second PCB, wherein tightening the at least one screw presses the electrically conducting element onto the ground contact of the second PCB.