Stator Terminal Layout for Compact Nozzle-Wound Rotating Machines
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Solution Overview
Problem
Conventional rotating electrical machines with inner rotor type stators face challenges in achieving cost reduction and miniaturization due to the need for nozzle winding, which results in coil terminals protruding outward, increasing the machine's radial size.
Innovation Solution
The design incorporates a stator core with an annular yoke and teeth, windings with coils wound around the teeth, winding holding portions, coil terminals with winding connection portions, and motor terminals that connect to an external power supply. The winding holding and connection portions are arranged inside the coil in the radial direction, and the motor terminal's connecting portion extends through the opposite side of the stator core relative to the metal plate, allowing for continuous nozzle winding without protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nozzle winding is used for cost reduction, then manufacturing cost is reduced, but coil terminals protrude outward increasing radial size
Solution Approach 1:
The patent inverts the conventional arrangement by placing the winding holding portion and winding connection portion inside the coil in the radial direction rather than outside. This inversion allows the coil terminals to be positioned within the radial space of the coil, preventing protrusion outward while maintaining nozzle winding manufacturing method
Solution Approach 2:
The patent repositions components from a radial outer arrangement to a radial inner arrangement, effectively utilizing the internal radial dimension of the coil structure. The winding holding portion and connection portion are arranged within the radial envelope of the coil, transforming the spatial configuration to eliminate external protrusion
2Ease of manufacture
If coil terminals are arranged on the outer periphery of the stator, then winding work can be performed, but the radial size of the rotating electrical machine increases
Solution Approach 1:
The patent nests the winding holding portion and winding connection portion within the radial space of the coil, similar to nesting one object inside another. The connection portions are positioned inside the coil's radial envelope, allowing the coil structure to contain the terminal arrangement without external protrusion
Data Source
AI summary
A rotating electrical machine includes a plurality of winding holding portions, a plurality of coil terminals having a winding connection portion connected to a winding, and a plurality of motor terminals connected to the coil terminal. The winding has two or more coils between one end portion and the other end portion. The winding holding portion and the winding connection portion are arranged inward of the coil in the radial direction. The motor terminal includes a connector portion connectable to an external power supply terminal, a contacted portion contacted by the contact portion of the coil terminal in the axial direction, and a connecting portion that connects the connector portion and the contacted portion. At least a portion of the connecting portion extends from the connector portion to the contacted portion through an opposite side to the stator core with respect to a metal plate.