Motor Cover Guide Structure for Resin Sealing and Waterproofing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing motors face issues with waterproofing, as filling material for enhancing stator insulation can spill from the cover near lead wire ports, leading to potential water ingress and deterioration of electrical insulation.
Innovation Solution
A motor design featuring a cover with a guide portion that includes a bottom plate and side walls to contain the filling material, preventing spillage and ensuring effective insulation by guiding the lead wire outward, while using a covering portion made of thermosetting resin to seal the stator and circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filling material is filled inside the cover to enhance waterproofing, then electrical insulation is improved, but filling material spills from the cover near lead wire ports
Solution Approach 1:
A guide portion is introduced as an intermediary structure between the cover and the lead wire. This guide portion includes a guide hole that directs the lead wire and a guide wall that prevents filling material from spilling out through the drawn-out port. The guide portion acts as a mediator that allows the lead wire to pass through while blocking the filling material, thus resolving the contradiction between achieving waterproofing and preventing spillage.
2Reliability
If filling material is filled to cover stator components, then waterproofing is enhanced, but the filling amount decreases due to spillage
Solution Approach 1:
The guide portion serves as a mediator structure that includes a guide hole and guide wall. The guide wall specifically prevents filling material from spilling out through the drawn-out port where the lead wire exits. This intermediary structure ensures that the filling material remains contained within the cover, maintaining the required waterproofing coverage without loss of material.
3Ease of operation
If lead wire is drawn out from the cover, then electrical connection is enabled, but filling material spills from the drawn-out port
Solution Approach 1:
The guide portion is designed as an intermediary structure with a guide hole that specifically accommodates the lead wire. The guide wall of this structure prevents filling material from spilling out through the drawn-out port while allowing the lead wire to pass through freely. This resolves the contradiction by enabling electrical connection through the lead wire while preventing the harmful effect of filling material spillage at the same location.
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 design effectively prevents filling material spillage, maintains electrical insulation, and reduces water ingress, thereby enhancing the motor's durability and efficiency.
Implementation Method 1
The covering portion is filled inside the cover and covers the stator core, the coil portion, and the circuit board
Data Source
AI summary
A motor includes a stator core, a coil portion, and a circuit board in a lidded cylindrical cover and covered with a covering portion that fills an inside of the cover. A guide portion of the cover is at an end portion of a board accommodation portion that surrounds and accommodates the circuit board. The guide portion accommodates and guides a lead wire to an outside in a radial direction. An end portion on an inside in the radial direction of a side wall portion is connected to the end portion on the one side in the axial direction of the board accommodation portion. An end portion on the one side in the axial direction of the side wall portion is farther to the one side in the axial direction than the end portion on the one side in the axial direction of the board accommodation portion.