Compound Motor Stator Winding Layout for Higher Slot Fill
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor stator winding structures fail to fully utilize the available space in the stator core, leading to insufficient slot fill factor and reduced motor efficiency, and assembled stator structures complicate assembly and increase volume.
Innovation Solution
A compound winding motor stator using rectangular and trapezoidal windings arranged in a staggered manner, combined with a 4Y circuit configuration, to maximize space utilization and improve slot fill factor without additional assembly components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If rectangular windings are used in concentrated winding, then the winding process is simple and can be achieved with winding machines, but the slot fill factor is insufficient due to triangular vacant areas in the slots
Solution Approach 1:
The invention divides the winding structure into two distinct segments: rectangular windings and trapezoidal windings. The rectangular windings are placed in outer slots while trapezoidal windings are placed in inner slots. This segmentation allows each winding type to optimally fill its designated space, eliminating the triangular vacant areas that occur with conventional rectangular-only windings, thereby improving the slot fill factor while maintaining manufacturing simplicity.
Solution Approach 2:
The invention applies different winding geometries to different local positions within the stator. Trapezoidal windings are specifically applied to inner slots where space utilization is critical, while rectangular windings are used in outer slots. This local differentiation optimizes space utilization in each specific region, maximizing the overall slot fill factor without complicating the general manufacturing process.
2Quantity of substance
If distributed winding is used, then space utilization is improved, but the winding process becomes more complex and cannot fully utilize tooth slot space
Solution Approach 1:
The invention segments the distributed winding approach into two manageable types: rectangular and trapezoidal. This segmentation simplifies the winding process by providing clear, distinct winding patterns for different slot positions, rather than requiring a single complex distributed winding pattern. The segmentation maintains high space utilization while reducing manufacturing complexity.
Solution Approach 2:
The invention introduces asymmetry by using trapezoidal windings with specific geometric characteristics (different base and top widths) in inner slots, while maintaining rectangular symmetry in outer slots. This asymmetric approach allows optimal space filling in critical inner regions without imposing complexity throughout the entire winding system.
3Quantity of substance
If assembled stator structure with baffles is used, then winding process is improved and slot fill factor increases, but the assembly structure becomes complicated and motor volume increases
Solution Approach 1:
The invention extracts and eliminates the need for additional assembly components like baffles and terminal ends that are required in conventional assembled stator structures. By using the compound winding approach directly in the integrated stator core, the solution achieves high slot fill factor without requiring separate assembly parts, thereby reducing assembly structure complexity and motor overall volume.
Solution Approach 2:
The invention merges the winding structure directly into the integrated stator core without requiring separate assembly components. The compound winding approach combines rectangular and trapezoidal windings within the same stator structure, eliminating the need for additional baffles and assembly operations, thereby simplifying the overall assembly structure while maintaining high slot fill factor.
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
Enhances slot fill factor, allowing the motor to output larger power under the same volume while simplifying assembly and reducing manufacturing costs.
Implementation Method 1
When being electrified, the stator windings generate a rotating magnetic field, which interacts with the permanent magnet on the rotor, such that the rotor starts to rotate and can output force
Data Source
AI summary
A compound winding motor stator includes a stator core and a coil winding structure. The stator core has a yoke, and a plurality of winding portions formed toward the center of the yoke in an equally distanced manner. The winding portions are defined as a plurality of first winding portions and a plurality of second winding portions. The first winding portions and the second winding portions are arranged in a staggered manner. The coil winding structure has first windings configured as rectangular windings and disposed on the first winding portions, and second windings configured as trapezoid windings and disposed on the second winding portions. Accordingly, the rectangular windings and the trapezoid windings are arranged in a staggered manner, that improves the slot fill factor of the motor stator, thereby increasing the efficiency of the motor.