Electric motor, blower, air conditioner, and method for manufacturing electric motor

The integration of a rough surface on the heat sink within the electric motor design effectively prevents moisture from reaching the circuit board, addressing the issue of moisture ingress and enhancing motor reliability, especially in moisture-exposed applications like air conditioners.

WO2025004305A1PCT designated stage expired Publication Date: 2025-01-02MITSUBISHI ELECTRIC CORP
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Patent Information

Application Number
PCT/JP2023/024321
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-06-30
Publication Date
2025-01-02

AI Technical Summary

Technical Problem

Moisture ingress through the interface between a heat sink and resin in electric motors can lead to circuit board failure, as existing designs do not effectively prevent moisture from reaching the circuit board.

Method used

A stator assembly with a metal heat sink having a rough surface portion between the contact area and the resin boundary, which prevents moisture from passing through and reaching the circuit board, is integrated into the electric motor design, along with a board holding member that supports the heat sink and suppresses circuit board deformation during molding.

Benefits of technology

The rough surface on the heat sink effectively blocks moisture ingress, protecting the circuit board from failure and enhancing the reliability of electric motors, particularly in applications like air conditioners exposed to moisture.

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Abstract

This electric motor comprises: a stator assembly that includes a stator and a circuit board; a metal member that is disposed so as to face the stator assembly; and a resin part that covers the stator assembly and the metal member so that a part of the metal member is exposed. The stator assembly has a contact member that abuts against the metal member. The metal member has a rough surface part between at least a contact part abutting against the contact member and a boundary part between the inside and the outside of the resin part. The surface roughness of the rough surface part is higher than the surface roughness of the exposed surface of the metal member exposed from the resin part and / or the surface roughness of the center part of the surface of the metal member facing the stator assembly.
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Citation Information

Patent Citations

  • Underwater motor

    JP1985059936A

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    JP1996308182A

  • Control function-provided actuator and electric pump

    JP2019075872A

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    WO2017145326A1

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