Motor Holder Structure for Bearing Heat Isolation
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Solution Overview
Problem
In conventional motors, the heat from the stator core easily transfers to the bearing, leading to increased bearing temperature and reduced bearing life, making stable long-term operation difficult.
Innovation Solution
The motor design includes a holding portion with a first and second bearing, where the stator core is fixed to the outer peripheral surface of a first holding portion, and the second bearing is fixed to the inner peripheral surface of a second holding portion with a radial gap, reducing direct heat transfer and enhancing bearing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the stator core is fixed directly to the bearing housing, then the structure is simple and easy to manufacture, but heat from the stator core transfers easily to the bearing, reducing bearing life
Solution Approach 1:
The patent introduces a holding portion as an intermediary component between the stator core and the bearing housing. This holding portion includes a first holding portion that contacts the stator core and a second holding portion that contacts the bearing, with a gap between them to prevent direct heat transfer. This mediator structure resolves the contradiction by maintaining structural simplicity while protecting the bearing from heat.
Solution Approach 2:
The holding portion is segmented into two distinct parts: the first holding portion for supporting the stator core and the second holding portion for supporting the bearing. This segmentation allows the structure to fulfill multiple functions while preventing heat transfer from the stator core to the bearing, thus improving bearing life without significantly complicating the manufacturing process.
2Temperature
If the bearing housing is in direct contact with the stator core, then heat transfer is efficient for cooling, but the bearing temperature increases and bearing life is reduced
Solution Approach 1:
The patent applies local quality by creating a gap specifically in the region where heat transfer would affect the bearing. The holding portion is designed with different thermal isolation characteristics in different regions: the first holding portion can still dissipate heat, while the second holding portion is thermally isolated from the stator core to protect the bearing. This localized approach resolves the contradiction between heat dissipation and bearing protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration suppresses heat conduction to the bearings, preventing temperature-related deterioration and ensuring stable operation of the bearings for a longer duration.
Implementation Method 1
a gap is located between the second holding portion and the stator core in a radial direction, and a radial thickness of the second holding portion is smaller than a radial distance between an outer peripheral surface of the second holding portion and an inner peripheral surface of the stator core
Data Source
AI summary
A motor includes a holder, a rotor inside the holder with a shaft rotatable about a central axis, first and second bearings rotatably supporting the shaft, and a stator radially outside the holder. The holder includes a first holder, and a second holder extending upward from an upper end of the first holder. The stator is fixed to an outer peripheral surface of the first holder, and an outer ring of the first bearing is fixed to a lower end of an inner peripheral surface of the first holder. A portion of an outer ring of the second bearing is fixed to an inner peripheral surface of the second holder. The second holder is radially spaced from the stator core. A radial thickness of the second holder is less than a distance between an outer peripheral surface of the second holder and an inner peripheral surface of the stator core.