Motor Wire Routing for Compressor Stress Reduction
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Solution Overview
Problem
In motor-driven compressors, the existing configuration of motor wires can lead to increased load on the wires due to acute angle bending when connecting them to conductive members, which may cause stress and affect the compressor's efficiency and size.
Innovation Solution
The motor wires are arranged with first and second extensions to connect to conductive members without acute angle bending, allowing them to extend from the inner side to the outer side and back to the inner side in the radial direction, reducing the load on the wires and facilitating a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If motor wires are routed adjacently in the radial direction to minimize axial projection, then the axial size of the compressor is reduced, but the motor wires are bent at acute angles increasing load and stress on the wires
Solution Approach 1:
The motor wires are arranged to extend in the circumferential direction rather than being bent at acute angles in the radial direction. This dimensional change in wire routing allows the wires to connect to conductive members located inward in the radial direction without experiencing acute angle bending, thereby reducing stress while maintaining compact axial dimensions through the insulating cluster block configuration.
2Area of stationary object
If conductive members are located inward in the radial direction to reduce radial size, then the radial dimension is minimized, but motor wires must be bent at acute angles to reach the conductive members
Solution Approach 1:
The motor wires are configured to extend in the circumferential direction on the outer end portion of the coil end, allowing them to reach conductive members located inward in the radial direction without acute angle bending. This circumferential routing path provides a more direct connection that simplifies wire routing while maintaining the compact radial dimension achieved by positioning conductive members inward.
Data Source
AI summary
A motor-driven fluid machine has three motor wires. The innermost one of the three motor wires in the radial direction of a rotary shaft on a specific section of an outer end portion of a coil end is defined as a first motor wire. The first motor wire has a first extension, which extends from an inner side toward an outer side in the radial direction of the rotary shaft at a position between the specific section and a downstream side in the extending direction of the motor wires, and a second extension, which is continuous from the first extension and extends from the outer side toward the inner side in the radial direction of the rotary shaft to be connected to a corresponding conductive member.