DC Brush Motor Sealing Against Siloxane Gas
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Solution Overview
Problem
DC brush motors experience contact failure due to toxic siloxane gas, which is difficult to seal when using female terminals, as existing sealing methods are ineffective in preventing gas ingress and deposition of silicon dioxide on contact parts.
Innovation Solution
A DC brush motor design featuring a bracket with recessed portions to accommodate female power feeding terminals, combined with a sealing member that seals the space between the bracket, case, and commutator, effectively preventing toxic gas ingress and maintaining electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a female terminal is used for power feeding, then the terminal can be fixed inside the case, but the inside of the case cannot be sealed effectively
Solution Approach 1:
The case is divided into a case body and a separate lid that can be detached. The female terminal is fixed to the case body, while the lid can be removed to access the terminal for connection. This segmentation allows the terminal to be installed inside the case while maintaining the ability to seal the case when connected.
Solution Approach 2:
A male terminal component serves as an intermediary element that connects to the female terminal inside the case. This male terminal acts as a mediator between the external power source and the internal female terminal, allowing electrical connection without requiring the female terminal to protrude or compromise the case sealing.
2Object-affected harmful factors
If a sealing member is added to seal the case, then toxic gas ingress is prevented, but device complexity increases
Solution Approach 1:
The sealing function is merged with the existing lid structure of the case. The lid is designed to fit tightly against the case body, creating a sealed enclosure without requiring additional separate sealing components. This integration maintains simplicity while achieving effective sealing against toxic gas ingress.
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
The solution effectively suppresses contact failure between the brush and commutator by sealing the recessed portions with a sealing member, preventing toxic gas introduction and maintaining reliable electrical connections.
Implementation Method 1
a sealing member that is fixed to the bracket. The sealing member is configured to seal between the recessed portion and a space where the commutator and the brush exist
Implementation Method 2
an armature configured to rotate relative to the magnet about a rotary axis, the armature comprising a commutator; a brush that is electrically connected to the female terminal
Data Source
AI summary
There is provided a DC brush motor that is provided with: a magnet; an armature configured to rotate relative to the magnet about a rotary axis, the armature comprising a commutator; a bracket configured to cover one end portion of the magnet and the armature at one side along the rotary axis; a female terminal that is fixed to the bracket; a brush that is electrically connected to the female terminal, and a sealing member that is fixed to the bracket. The bracket is provided with a recessed portion formed on an outer periphery thereof and configured to accommodate therein the female terminal. The sealing member is configured to seal between the recessed portion and a space where the commutator and the brush exist.