Fan cooled dual-compartment electronic housing for an electric motor

Patent metadata

Field	Value
Publication number	US-10439475-B2
Application number	US-201314385266-A
Country	US
Kind code	B2
Filing date	Feb 19, 2013
Priority date	Mar 15, 2012
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

An electric motor with a stator housing ( 2 ) and with an electronics housing ( 8 ), has a first section (A) of the electronics housing arranged on the radial side of the stator housing ( 2 ), and a fan ( 24 ) arranged on a first axial end ( 22 ) of the stator housing ( 2 ). The electronics housing ( 8 ) extends in the axial direction (X) beyond the first axial end ( 22 ) of the stator housing in a manner such that a second section (B) of the electronics housing ( 8 ), in whose inside at least one first heat-producing electronic component ( 58, 60 ) is arranged, is situated on the radial side of the fan ( 24 ). A pump assembly with such an electric motor is also provided.

First claim

The invention claimed is:

1. An electric motor comprising:
a stator housing comprising a stator housing axial end and a longitudinal axis;
an electronics housing, wherein a first section of the electronics housing is arranged on a radial side of the stator housing, the electronics housing extending in an axial direction beyond the stator housing axial end, the axial direction being parallel to the longitudinal axis of the stator housing, wherein an extension of the electronics housing forms a second section of the electronics housing;
at least one first heat-producing electronic component, wherein the at least one first heat-producing electronic component is a rectifier and/or an inverter of a frequency converter arranged inside the second section of the electronics housing, the at least one first heat producing electronic component producing the most heat in the inside of the electronics housing;
a plurality of second heat producing components, wherein the plurality of second heat producing components are arranged inside the first section of the electronics housing, which first section does not house the at least one first heat producing electronic component, wherein each of the second heat producing components comprises lower heat producing components, which lower heat producing components produce less heat than the at least one first heat producing electronic component; and
a fan arranged on the stator housing axial end, the second section being situated on a radial side of the fan, wherein the at least one first heat-producing electronic component inside the second section of the electronics housing is in thermal contact with an inner side of the first wall section directly adjacent to the fan and above the fan such that the at least one first heat-producing electronic component is located at a position beyond the stator housing axial end, the fan generating a flow of fluid radially directed toward the second section.

2. An electric motor according to claim 1 , wherein cooling ribs which extend in the peripheral direction with respect to the rotation axis of the electric motor, are formed on the outer side of said first wall section facing the fan, on the second wall section of the electronics housing which is arranged on the radial side of the fan, the first wall section comprising an inner surface, the at least one first heat-producing electronic component being in direct contact with the inner surface, wherein the at least one first heat-producing electronic component is in direct thermal contact with the inner surface.

3. An electric motor according to claim 1 , wherein a pocket is recessed in the second section of the electronics housing, in the inside of which pocket a heat-producing electronic component is arranged, and is arranged in a manner such that a tangentially directed cooling airflow flows onto the pocket on an outer side.

4. An electric motor according to claim 1 , wherein the first wall section of the electronics housing which faces the fan and the second wall section of the electronics housing which faces the stator housing are manufactured of one piece, the at least one first heat-producing electronic component directly facing the inner side of the first wall section.

5. An electric motor according to claim 1 , wherein an electromagnetic shielding is arranged in the inside of the electronics housing between two regions of the interior, the at least one first heat-producing electronic component being supported by bearing-contact surfaces of the inner side of the first wall section.

6. An electric motor according to claim 1 , wherein mechanical and/or electronic connection elements are arranged between the stator housing and the electronics housing in a manner such that they are situated laterally of a cooling airflow between the stator housing and the electronics housing.

7. A pump assembly with a drive motor, wherein the drive motor is an electric motor according to claim 1 .

8. An electric motor according to claim 1 , wherein a cooling airflow produced by the fan flows over the second section of the electronics housing on an outer side thereof, in the tangential direction.

9. An electric motor according to claim 8 , wherein a first part airflow of the cooling airflow produced by the fan flows over an outer side of the second section of the electronics housing, and a second part airflow flows over an outer side of the first section of the electronics housing.

10. An electric motor according to claim 1 , wherein said electronics housing comprises said first wall section and a second wall section, said first wall section and said second wall section defining a lower wall of said electronics housing, wherein a ribbing directed towards the fan extends from an outer side of said first wall section facing the fan, on the second section of the electronics housing which is arranged on the radial side of the fan, wherein the first section of the electronics housing on an outer side of said second wall section facing a peripheral surface of the stator housing comprises cooling ribs which extend parallel to a rotation axis of the electric motor.

11. An electric motor according to claim 10 , wherein said ribbing is perpendicular to said cooling ribs.

12. An electric motor according to claim 1 , wherein a ribbing directed towards the fan is formed on the outer side of said first wall section facing the fan, on the second section of the electronics housing which is arranged on the radial side of the fan.

13. An electric motor according to claim 12 , wherein the first section of the electronics housing on the outer side of said second wall section facing the peripheral surface of the stator housing comprises cooling ribs which extend parallel to the rotation axis of the electric motor.

14. An electric motor according to claim 13 , further comprising at least one second heat-producing electronic component arranged on an inner side of the second wall section facing the stator housing, in the first section of the electronics housing.

15. An electric motor according to claim 13 , wherein at least the first wall section of the electronics housing which faces the fan and/or the second wall section of the electronics housing which faces the stator housing, are manufactured of metal.

16. An electric motor comprising:
a stator housing;
an electronics housing comprising a lower wall, said lower wall defining at least a portion of an interior space of said electronic housing, said lower wall comprising a first wall section and a second wall section, said first wall section being arranged on a radial side of the stator housing;
a heat-producing electronic component comprising a rectifier and/or an inverter of a frequency converter;
a fan arranged on an axial end of the stator housing, wherein the second wall section comprises an axial extent located beyond the axial end of the stator housing, the axial extent extending in an axial direction relative to a longitudinal axis of said fan, said fan being arranged on the axial end of the stator housing, said second wall section being arranged on a radial side of the fan, wherein airflow is directed to pass over said second wall section prior to passing over said first wall section, the heat-producing electronic component being arranged in said interior space of the electronics housing, wherein the heat-producing electronic component is arranged directly opposite an inner side of said axial extent, at least a portion of the airflow being directed in a radial direction toward said axial extent with respect to said longitudinal axis, said heat-producing electronic compon

Assignees

• Grundfos Holding As

Inventors

• Madsen Obel Palle
• Østergaard Lars

Classifications

• H02K11/33

  Drive circuits, e.g. power electronics (H02K11/38 takes precedence) · CPC title

• H02K5/18

  with ribs or fins for improving heat transfer · CPC title

• H02K9/06 Primary

  with fans or impellers driven by the machine shaft · CPC title

• H02K11/01

  for shielding from electromagnetic fields {, i.e. structural association with shields} (means for preventing or reducing eddy-current losses in the winding heads by shielding H02K3/42) · CPC title

• H02K11/0141

  Shields associated with casings, enclosures or brackets · CPC title