Motor Insulator Movement Restriction for Lead Parts
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Solution Overview
Problem
Motors with star-connected stator windings require a guide member to restrict movement of second lead parts, which complicates the structure and requires separate mounting and wiring, leading to potential contact issues with nearby electrical components.
Innovation Solution
Incorporating a movement restriction part on the outer wall of the electrical insulator assembly, which includes projections and grooves to prevent radial and circumferential movement of the neutral point part, allowing for simple and effective restriction of the second lead parts without the need for additional guide members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide member is provided to hold the second lead parts, then movement of the second lead parts is restricted, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent combines the guide member function with the electrical insulator assembly by forming the guide member as an integral part of the insulator assembly's outer wall part. This eliminates the need for a separate guide member component, reducing device complexity while maintaining the movement restriction function for the second lead parts.
Solution Approach 2:
The outer wall part of the electrical insulator assembly serves multiple functions: it provides electrical insulation, structural support, and guides/restricts the movement of the second lead parts. By making the guide function universal to the insulator assembly, the patent reduces the total number of components while achieving reliable lead part positioning.
2Reliability
If a guide member is provided separately from the electrical insulator assembly, then movement restriction is achieved, but manufacturing precision requirements increase and assembly becomes more complex
Solution Approach 1:
The guide member is formed as an integral part of the outer wall part of the electrical insulator assembly. This integration eliminates the need for separate mounting operations, reducing assembly complexity and ensuring precise positioning of the second lead parts without requiring high mounting precision.
Solution Approach 2:
The guide member structure is pre-formed as part of the insulator assembly during the insulator manufacturing process. This preliminary formation of the guide function ensures that the second lead parts are correctly positioned from the start, eliminating the need for subsequent precision mounting operations.
3Ease of operation
If the second lead parts are allowed to move freely, then ease of operation is improved, but harmful contact with nearby electrical components may occur
Solution Approach 1:
The guide member formed on the outer wall part of the insulator assembly acts as an intermediary structure that allows the second lead parts to be positioned and guided while preventing them from contacting nearby electrical components. The guide member's grooves and surfaces provide controlled movement paths that maintain safe distances from other components.
Data Source
AI summary
A motor includes a rotor and a stator having a tubular stator core, first and second electrical insulators arranged on first and second axial ends of the stator care and a stator winding. Each of the first and second electrical insulators includes an outer wall part, inner wall parts and body parts. The stator winding includes first, second and third phase stator windings and each of the windings has winding parts respectively wound around teeth of the stator core, a first lead part and a second lead part. Each of the first lead parts is connected to a power supply, and each of the second lead parts is connected in common to a neutral point part. The outer wall part of the first electrical insulator assembly includes a first movement restriction part that restricts movement of the neutral point part.