Three-Phase Motor Wire Connecting Structure
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Solution Overview
Problem
In three-phase motors using Y wire connecting, the connection operation at the short circuit terminal requires three positions, increasing man-hours and resulting in a large-shaped terminal that is not suitable for external circuit connection.
Innovation Solution
A wire connecting structure where coils of two phases are formed by a single continuous conducting wire, with one end connected to an external terminal and the other end to a short circuit terminal, reducing the number of connection points and terminal size by using U-shaped connecting portions on the neutral point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Y wire connecting is used with three separate conducting wires for each phase, then reliable electrical connection is achieved, but the number of connection positions increases to three, increasing man-hours and resulting in a large-sized short circuit terminal
Solution Approach 1:
The patent merges the functions of three separate conducting wires into a single continuous conducting wire that sequentially connects all three phases (U-phase, V-phase, W-phase) to the short circuit terminal. This combining approach reduces the number of connection positions from three to one, thereby improving productivity while maintaining reliable electrical connection through the continuous wire path.
Solution Approach 2:
The single continuous conducting wire performs multiple functions: it serves as the connection wire for all three phases simultaneously and acts as a jumper wire for inter-phase connections. This multi-functional design eliminates the need for separate connection operations at three different positions, reducing manual labor while ensuring reliable electrical connectivity across all phases.
2Reliability
If Y wire connecting is used with three separate conducting wires for each phase, then complete phase coverage is achieved, but the short circuit terminal becomes large-sized and unsuitable for external circuit connection
Solution Approach 1:
The patent combines multiple connection functions into a single continuous conducting wire that sequentially connects U-phase, V-phase, and W-phase to the short circuit terminal. This merging reduces the terminal area required from three separate connection points to one consolidated connection point, making the terminal compact and suitable for external circuit integration while maintaining complete phase coverage.
3Adaptability or versatility
If multiple connection positions are required at the short circuit terminal, then all phases can be connected, but the terminal size increases and is not suitable for external circuit connection
Solution Approach 1:
The single continuous conducting wire serves as a universal connection medium that sequentially connects all three phases to the short circuit terminal. This multi-functional wire design enables complete phase connection capability while reducing the terminal size from multiple connection points to a single compact connection point, making it adaptable for external circuit integration.
Data Source
Figure 1~2
Figure 3~4(b)
AI summary
Provided is a wire connecting structure of coils of a three-phase motor, a wire connecting method and three-phase motor, which is capable of reducing a size of a short circuit terminal for a neutral point. The wire connecting structure is a wire connecting structure of coils which are wound to each salient-pole (12, U1, U2, V1, V2, W1, W2) in a three-phase motor having respective salient-pole (12, U1, U2, V1, V2, W1, W2) of a U phase, a V phase and a W phase, the coils of the salient-poles (U1, U2, W1, W2) belonging to any two phases among the U phase, the V phase and the W phase are formed by a single continuous first conducting wire (21), and the coil of the salient-pole (V1, V2) belonging to the rest one phase is formed by a single continuous second conducting wire (22).