Submersed Motor Capacitor Segmentation for Resin Flow
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Solution Overview
Problem
Existing submersed electric motors with annular capacitors face assembly challenges and resin casting issues due to the capacitor's axial arrangement, which can lead to misalignment and obstruction of insulation resin, affecting motor compactness and performance.
Innovation Solution
The motor design features two complementary, arc-shaped capacitors connected in parallel, with longitudinal channels and cavities to facilitate capacitor alignment and resin passage, and a capacitor supporting cap with centering tabs and snap coupling for precise placement, allowing easier assembly and resin casting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the annular capacitor is arranged axially between the stator windings and the annular cover to facilitate wiring, then electrical connection is simplified, but the capacitor obstructs the passage of insulation resin that must fill the annular interspace
Solution Approach 1:
The single annular capacitor is divided into two complementary arc-shaped capacitors arranged side by side. Each capacitor has longitudinal channels and cavities that allow insulation resin to pass through, eliminating the obstruction problem while maintaining the wiring facilitation benefit
Solution Approach 2:
The capacitor structure is modified with longitudinal channels and cavities at specific locations to enable resin passage while maintaining capacitance function. The arc-shaped design with these localized features allows resin to flow through the capacitor assembly without complete obstruction
2Ease of manufacture
If the annular capacitor rests on the windings to facilitate assembly, then assembly is simplified, but the uneven winding surface causes axial misalignment of the capacitor
Solution Approach 1:
A capacitor supporting cap is introduced as an intermediary component between the windings and the capacitors. This supporting cap provides a flat, precise mounting surface with centering tabs that ensure accurate axial alignment, eliminating the misalignment caused by resting directly on uneven windings
Solution Approach 2:
The two arc-shaped capacitors are designed with asymmetric features including centering tabs and specific mounting configurations that enable precise positioning on the supporting cap, ensuring proper alignment despite the asymmetric nature of arc shapes
Data Source
AI summary
A submersed electric motor includesa stator assembly arranged within an annular insulation chamber, and a stator with stator windings and a capacitive electric starter which is connected electrically thereto.The insulation chamber is formed between an outer tubular jacket, an inner tubular jacket, which is coaxial to the outer tubular jacket, with two annular end covers adapted to close the annular interspace between the outer jacket and the inner jacket.The submersed electric motor further includesa rotor arranged inside the inner tubular jacket.The capacitive electric starter includes at least two capacitors, which are mutually complementary, and have a transverse cross-section with an arc-like profile and are connected in parallel to each other.