Motor and method for producing motor
The motor design with a hollow shaft and strategic bearing placement enhances heat dissipation in outer rotor type motors, addressing size constraints while maintaining thermal efficiency.
WO2026116336A1PCT designated stage Publication Date: 2026-06-04NIDEC CORP(JP)
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- NIDEC CORP(JP)
- Filing Date
- 2025-11-26
- Publication Date
- 2026-06-04
AI Technical Summary
Technical Problem
Outer rotor type motors face challenges in heat dissipation without increasing size, particularly when relying on natural heat dissipation, as the coil, being a heat source, is radially inside and difficult to cool effectively.
Method used
A motor configuration with a hollow fixed shaft, a stator fixed on its outer circumferential surface, and a rotor supported by bearings, where the stator and bearings are positioned to allow heat transfer to the inner circumference of the shaft, enhanced by heat dissipation fins and a through-hole design for lead wires, maintaining compact size.
Benefits of technology
The configuration effectively dissipates heat without enlarging the motor's size, improving thermal performance through efficient heat transfer and compact design.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure JP2025041084_04062026_PF_FP_ABST
Abstract
This motor comprises: a hollow fixed shaft that is centered on a central axis and that extends in the axial direction; a stator that is fixed on the outer peripheral surface of the fixed shaft; a rotor that is positioned radially outward of the stator and that rotates about the central axis; and a plurality of bearings that are fixed on the outer peripheral surface of the fixed shaft and that rotatably support the rotor. The stator has an annular stator core, the inner peripheral surface of which contacts the outer peripheral surface of the fixed shaft, and a coil which is wound on the stator core. The coil has a first-side coil end part that protrudes to one axial side of the stator core. The plurality of bearings include a first-side bearing that is positioned on said one axial side with respect to the stator core. In a view from said one axial side, at least part of the first-side bearing is positioned so as to overlap the first-side coil end part in the axial direction.
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