Motor Brush Holder Gap Design for Thermal Stability
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Solution Overview
Problem
Structures with a brush holder fitted to a cylindrical yoke in motors face loose connections due to thermal and humidity variations, causing the state of fitting between members to change over time.
Innovation Solution
A motor design featuring a cylindrical housing with a first locking part that elastically deforms a second member, creating a gap between the second member and the housing, allowing for deflection when dimensions change, thus maintaining the members in a stable fixed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If members are fitted and fixed tightly to each other, then connection strength is improved, but the fitting state undergoes gradual change due to thermal and humidity variations, resulting in loose connections
Solution Approach 1:
The patent introduces a gap between the brush holder and yoke, changing the physical parameter of the assembly from tight contact to spaced configuration. This gap allows the brush holder to expand and contract freely with thermal and humidity variations, preventing the fitting state from undergoing gradual changes while maintaining connection strength through the locking part structure
Solution Approach 2:
The invention divides the connection structure into separate components: a locking part that provides mechanical interlocking and a gap that provides expansion space. This segmentation allows the locking part to maintain connection strength while the gap accommodates dimensional changes, resolving the contradiction between tight connection and fitting stability
2Stability of the object's composition
If a locking part is used to fix members together, then connection stability is improved, but the locking part itself deforms due to repeated thermal expansion and contraction of the members
Solution Approach 1:
By introducing a gap between the brush holder and yoke, the patent changes the physical state from continuous contact to separated configuration. This prevents the locking part from experiencing repeated deformation forces during thermal expansion and contraction cycles, maintaining both connection stability and locking part integrity
Solution Approach 2:
The gap acts as a cushioning space that anticipates and accommodates thermal expansion and contraction before they can transmit forces to the locking part. This beforehand cushioning prevents the locking part from deforming while maintaining connection stability
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
Prevents looseness between the housing and the brush holder by allowing the second member to deflect, maintaining the locked state and preventing deformation of the locking part, ensuring the motor remains securely assembled despite environmental changes.
Implementation Method 1
The second member is elastically deformed by the first locking part and locked to the housing accordingly
Data Source
AI summary
A motor includes: a cylindrical housing that houses a rotor; a first member mounted to an opening of the housing; and a second member sandwiching the first member as mounted between the second member and the housing. The housing includes, at an end of the housing that faces the second member, a first locking part that locks a first locked part of the second member. The second member is elastically deformed by the first locking part and locked to the housing accordingly and is configured such that a gap is formed between the second member and the housing when the second member is locked to the housing.