Stator Coil Connection Layout to Reduce Drive Motor Height
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Solution Overview
Problem
The existing connection structure of drive motors in eco-friendly vehicles, which includes a circle-type terminal, increases the motor's height, requires additional insulation processes, and complicates the positioning and connection of coils, leading to inefficiencies in coil connection and motor performance.
Innovation Solution
A connection structure for the stator of a drive motor that eliminates the circle-type terminal by allowing coils to be wound in multiple slots and withdrawn in two distinct manners, reducing the length of coils needed for connection and enhancing efficiency by configuring withdrawal directions and connections symmetrically and serially across the stator core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circle-type terminal is used to connect coils withdrawn from stator slots, then the coils can be connected, but the height of the drive motor is increased
Solution Approach 1:
The patent extracts and eliminates the circle-type terminal from the motor structure. Instead of using a separate terminal component to connect coils, the invention integrates the connection function directly into the stator core by withdrawing coils from slots in two different directions, thereby removing the height-increasing terminal structure while maintaining electrical connection functionality.
Solution Approach 2:
The patent changes the spatial arrangement of coil withdrawal from a single-direction arrangement (requiring a terminal at the top) to a two-directional arrangement (withdrawal lines extending in opposite directions from slots). This dimensional change in coil configuration eliminates the need for a top-mounted terminal structure, thus reducing motor height.
2Ease of manufacture
If a circle-type terminal is used to connect coils, then connection is possible, but additional insulation processes are required
Solution Approach 1:
The patent removes the circle-type terminal structure that necessitates separate insulation processes. By integrating the connection function into the stator core through dual-directional coil withdrawal, the invention eliminates the need for additional insulation components and processes that would be required with a separate terminal structure.
3Ease of manufacture
If a circle-type terminal is used, then coils can be connected, but the position of three-phase withdrawal parts cannot be changed
Solution Approach 1:
The patent introduces flexibility and adaptability to the coil withdrawal system. Instead of fixed withdrawal positions constrained by a terminal structure, the invention enables coils to be withdrawn in two opposite directions from slots, allowing the three-phase withdrawal parts to be positioned flexibly at different locations along the withdrawal lines, thus enhancing adaptability.
4Device complexity
If coils are withdrawn using a fixed position structure, then connection is simplified, but efficiency is reduced due to longer coil lengths
Solution Approach 1:
The patent optimizes coil efficiency by changing the withdrawal geometry from a fixed single-position arrangement to a two-directional arrangement. This allows coils to be withdrawn more directly toward their connection points, reducing the length of withdrawal lines and minimizing resistive losses, while maintaining connection simplicity through the structured dual-directional configuration.
Data Source
AI summary
A connection structure of a stator of a drive motor is configured to allow coils to be wound in a plurality of slots provided in a stator core and to connect the coils withdrawn from the slots. The coils are wound in the slots to form first-type structures and second-type structures configured such that withdrawal directions of three-phase (U-, W- and V-phase) withdrawal lines and N-phase withdrawal lines withdrawn from the slots of the first-type structures are opposite to withdrawal directions of three-phase (U-, W- and V-phase) withdrawal lines and N-phase withdrawal lines withdrawn from the slots of the second-type structures. The first-type structures and the second-type structures are disposed symmetrically to each other with respect to a reference line formed to divide the slots in half.