Delta-Connected Motor Stator Winding for Busbar Simplification
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Solution Overview
Problem
Conventional delta-connected three-phase motors with far-apart coil ends result in complex busbar structures and increased manufacturing costs due to the distance between coil ends, leading to increased complexity and cost in the surrounding wires or busbar structure.
Innovation Solution
A motor design with a stator having an annular shape and a rotor, featuring conductive wires of three phases (U-phase, V-phase, and W-phase) delta connected, where at least two coils of each phase are connected in series and wound in opposite directions around teeth, with ends of the conductive wires withdrawn from one side, reducing the distance between coil ends and simplifying the busbar connection structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional delta-connected three-phase motors are used with coils wound around teeth, then the motor structure is simple and manufacturing is straightforward, but the distance between coil ends becomes far, resulting in complex busbar structures and increased manufacturing costs
Solution Approach 1:
The patent changes the winding direction of conductive wires in alternating slots from the conventional single-direction winding to bidirectional winding (some slots wind clockwise, others counter-clockwise). This dimensional change in winding orientation allows coil ends to be positioned adjacently rather than at opposite ends of the stator, thereby reducing busbar complexity while maintaining manufacturing simplicity
Solution Approach 2:
The patent introduces asymmetry in the winding pattern by making the winding direction of conductive wires alternate between adjacent slots. This asymmetric winding arrangement creates a more balanced distribution of coil ends, allowing them to be located closer together and simplifying the busbar connection structure
2Reliability
If conventional delta-connected three-phase motors are used with far-apart coil ends, then the basic motor structure is maintained, but the surrounding wires and busbar structure become complex, increasing manufacturing cost
Solution Approach 1:
The patent changes the winding direction parameter of conductive wires in alternating slots, creating a pattern where adjacent slots have opposite winding directions. This parameter change redistributes the coil end positions, allowing them to be located adjacently rather than far apart, thereby simplifying the busbar structure and reducing manufacturing cost while preserving magnetic balance
3Device complexity
If coils are connected in series with adjacent arrangement in circumferential direction, then the busbar structure is simplified, but the winding direction of conductive wires must be changed between phases
Solution Approach 1:
The patent segments the stator slots into different winding zones where adjacent slots have different winding directions. This segmentation allows the conductive wires to be wound in opposite directions in alternating slots, enabling coil ends to be positioned adjacently and simplifying the busbar structure, while the segmented approach makes the winding direction control more manageable
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design simplifies the busbar connection structure, reduces the spatial requirements for connecting units, and minimizes the size of the motor, thereby lowering manufacturing costs and achieving a more compact motor configuration while maintaining excellent magnetic property balance.
Implementation Method 1
conductive wires wound around the plurality of teeth... conductive wires of three phases corresponding to a U-phase, a V-phase, and a W-phase... delta connected
Data Source
AI summary
A stator includes conductive wires wound around teeth, and slots between adjacent teeth in a circumferential direction. The conductive wires include conductive wires of three phases corresponding to a U-phase, a V-phase, and a W-phase, and the conductive wires are delta connected. Coils, in which any one of the conductive wires is wound around the teeth, are repeatedly disposed in order of the U-phase, the V-phase, and the W-phase in the circumferential direction. In each of the U-phase, the V-phase, and the W-phase, at least two coils are connected in series and adjacent in the circumferential direction. A direction in which the U-phase and W-phase conductive wires are wound around the teeth and a direction in which the V-phase conductive wire is wound around the tooth are opposite.