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BR-102020025141-B1 - ELECTRONICALLY COMMUTED ROTATING ELECTRIC MACHINE

BR102020025141B1BR 102020025141 B1BR102020025141 B1BR 102020025141B1BR-102020025141-B1

Abstract

ELECTRONICALLY COMMUTED ROTATING ELECTRIC MACHINE. The present invention relates to an electronically commutated rotating electric machine (1) comprising a first enclosure part (2) housing the active core of the machine and a second enclosure part (3) housing the control drive, wherein the first and second enclosure parts (2, 3) are configured so that, after being connected to each other, a gap is formed between them; the parts (2, 3) having deflector portions (4a, 6a) that are configured to direct an airflow into the gap.

Inventors

  • ROGER SCHIPMANN EGER
  • RAMON GOMES DA SILVA
  • RUBENS FERNANDO MISSIO

Assignees

  • WEG EQUIPAMENTOS ELÉTRICOS S/A

Dates

Publication Date
20260317
Application Date
20201209
Priority Date
20191209

Claims (3)

  1. 1. Electronically commutated rotating electric machine (1) comprising a first housing part (2) housing the active core of the machine and a second housing part (3) housing the control drive, the first and second housing parts (2, 3) being configured so that, after being connected to each other, a gap is formed between them; the rotating electric machine being characterized in that: the first enclosure part (2) comprises a back plate (4) with at least one deflector portion (4a) formed on the perimeter of a surface portion of the back plate (4); the second enclosure part (3) comprises a front plate (6) comprising at least one deflector portion (6a) formed on the perimeter of a surface portion of the front plate (6); the gap being formed between the back plate (4) and the front plate (6), such that the deflector portions (4a, 6a) are configured to direct an airflow into the gap; and the first and second enclosure parts (2, 3) are dimensioned such that a portion of at least one deflector portion (4a) of the back plate (4) directly receives an airflow flowing from a rear part of the machine (1); and a portion of at least one deflector portion (6a) of the front plate (6) directly receives an airflow flowing from a front part of the machine (1); wherein at least one deflector portion (4a) of the rear plate (4) and at least one deflector portion (6a) of the front plate (6) do not overlap in the circumferential direction.
  2. 2. Machine according to claim 1, characterized in that deflector portions (4a, 6a) are configured in a concave shape.
  3. 3. Machine according to either claim 1 or 2 characterized in that the front plate (6) has a plurality of heat exchange projections (6b).

Description

Field of invention [001] The present invention relates to an electronically commutated rotating electric machine and, more specifically, to a thermal dissipation solution for an electronically commutated rotating electric machine. Fundamentals of the invention [002] Electronically commutated rotating electrical machines, such as electronically commutated motors (EC motors), are machines that use an electronic control drive to vary the speed of the machine. [003] EC motors comprise a housing with a first housing part intended to house the motor components and a second housing part intended to house the drive. [004] One of the challenges associated with electronically commutated rotating electrical machines is related to the temperature reached by the machines. In fact, both the motor components and the electronic control components generate heat during operation, so it is necessary to develop some type of ventilation solution to cool the components and prevent failures and malfunctions. [005] One of the known solutions for cooling EC machines is to provide air inlet and outlet openings in the housing, to allow air to circulate and cool the components by heat exchange. [006] Another known solution is described in document US10291102B2, which describes a motor including a housing, a front cover and a fan, wherein the front cover is formed with air intake holes and air-directing fins. [007] Another solution is described in document EP3043450, which discloses a motor with a substantially cylindrical housing and a cooling fan. The motor further includes a sleeve fitted around the housing and integrally formed with a plurality of wind-catching projections to receive the airflow induced by the cooling fan. [008] Document EP2973957 shows yet another ventilation solution, wherein the electric machine includes a housing with at least one air inlet, one air outlet, and an air passage extending between at least one air inlet and the air outlet. The electric machine also includes a first heat sink positioned at least partially within the air passage and a second heat sink positioned at least partially within the air passage downstream of the first heat sink. A cooling airflow through at least one air inlet flows through the air passage to cool the first heat sink and the second heat sink before the cooling airflow is exhausted through the air outlet. [009] Document WO2004023628, in turn, describes an electric motor cooling solution, in which the motor comprises a first housing having a first wall defining a first interior space and at least one opening disposed on a surface of the first housing; a second compartment having a second wall defining a second interior space and at least one opening disposed on a surface of the second compartment. [0010] Although different cooling solutions have been developed, the need for a heat dissipation solution for an electrically commutated rotating machine that operates efficiently with airflow in both axial directions, is easy to assemble, and has reduced dimensions remains in the state of the art. OBJECTIVES OF THE INVENTION [0011] It is an object of the present invention to provide an electronically commutated rotating electric machine with an improved thermal dissipation solution. [0012] Another objective of the present invention is to provide an electronically commutated rotating electric machine with a thermal dissipation solution that operates with airflow in both axial directions (bidirectional). [0013] Yet another objective of the present invention is to provide an electronically commutated rotating electric machine that is easy to assemble and maintain. [0014] Another objective of the present invention is to provide an electronically commutated rotating electric machine that has reduced dimensions. BRIEF DESCRIPTION OF THE INVENTION [0015] The present invention contemplates an electronically commutated rotating electric machine comprising a first housing part that houses the active core of the machine and a second housing part that houses the control drive, wherein: [0016] the first and second parts of the enclosure are configured so that, after being fixed to each other, a gap is formed between them; [0017] the first part of the enclosure comprises a backplate with at least one deflector portion; [0018] the second part of the enclosure comprises a front plate comprising at least one deflector portion; [0019] the gap being formed between the rear plate and the front plate, so that the deflector portions are configured to direct an airflow into the gap. [0020] In one embodiment of the invention, the deflector portions are configured in a concave shape. However, the deflector portions may have any other shapes that allow the airflow to be directed into the gap. [0021] The first and second parts of the enclosure can be dimensioned so that: [0022] a portion of the surface of the back plate directly receives an airflow flowing from a rear part of the machine; and a portion of the