Stator Winding Layer Configuration for Inductance Adaptability
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Solution Overview
Problem
Existing stator designs for rotating electric machines lack clarity on equal winding lengths and voltage drops across phase-windings, and the ability to change inductance by reconnecting phase-windings is unclear.
Innovation Solution
A stator with a hollow cylindrical core and multi-phase windings where first and second windings are connected across specific layers, with stair-shaped and crank-shaped turn portions, and irregular-shaped conductors for inter-layer connections, allowing for equal winding lengths and flexible connections like Y, Δ, or Y-Δ configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase-windings are Y-connected to form the stator coil, then the stator can be assembled, but it is unclear whether the phase-windings can be disassembled and reconnected into other connections for changing the inductance
Solution Approach 1:
The phase-windings are divided into multiple independent windings (first winding and second winding) that can be separately handled. Each winding has defined ends that can be independently connected or disconnected, enabling flexible reconfiguration between Y-connection, Δ-connection, and other connection types without requiring complete disassembly of the entire stator coil assembly
Solution Approach 2:
The connection configuration of the stator coil is made dynamic and adjustable. The ends of the first and second windings are designed to be connectable or disconnectable, allowing the inductance to be changed by reconnecting the phase-windings into different configurations (Y, Δ, or other connections) based on operational requirements
2Reliability
If the stator coil is provided in multiple layers with complex winding arrangements, then the electrical performance can be optimized, but it is unclear whether the lengths of phase-windings are equal and whether voltage drops are equal
Solution Approach 1:
The winding structure is designed to achieve equipotentiality in terms of voltage drops across phase-windings. By carefully arranging the first and second windings in specific layers and ensuring proper electrical connections between their ends, the design ensures that voltage drops are equal across all phase-windings, maintaining balanced electrical performance despite the multi-layer complexity
Solution Approach 2:
Different layers are assigned specific functions with tailored winding arrangements. The first winding is located in specific layers while the second winding is located in other layers, with each layer's winding configuration optimized for its local electrical requirements while maintaining overall equality of voltage drops across the complete phase-windings
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
Ensures equal voltage drops across phase-windings and allows for diverse electrical connections, enhancing the performance and adaptability of rotating electric machines.
Implementation Method 1
The first winding extends around the stator core so as to be located at the (2n−1)th and 2nth layers of the stator coil... The second winding extends around the stator core so as to be located at the (2n+1)th and (2n+2)th layers of the stator coil
Data Source
AI summary
A stator includes a hollow cylindrical stator core and a stator coil. The stator core has a plurality of slots formed therein. The stator coil is provided in the slots of the stator core in a plurality of layers in a radial direction of the stator core, and includes a first winding and a second winding. The first winding extends around the stator core so as to be located at the (2n−1)th and 2nth layers of the stator coil, and has an end located at the 2nth layer, where n is a natural number. The second winding extends around the stator core so as to be located at the (2n+1)th and (2n+2)th layers of the stator coil, and has an end located at the (2n+1)th layer. The ends of the first and second windings, which are respectively located at the 2nth and (2n+1)th layers, are electrically connected to each other.