Electric Motor Winding Group Arrangement for Inductance Stability
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Solution Overview
Problem
Magnetic flux leakage in electric motor coil units leads to variations in inductance, causing instability in electric current flow and output.
Innovation Solution
The electric motor design includes a stator with slots containing coil units formed by winding groups connected in series, with different numbers of turns arranged in descending order towards the shaft, and an insulating member to prevent electrical interference between winding groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple winding groups are provided in one slot, then the coil unit can be constructed with parallel wires, but magnetic flux leakage occurs causing variation in inductance
Solution Approach 1:
The patent applies local quality by arranging winding groups with different numbers of turns in specific positions within the slot. The winding groups are positioned such that those with fewer turns are placed closer to the shaft, while those with more turns are placed farther away. This localized differentiation in turn distribution optimizes the magnetic flux path and reduces leakage flux, thereby stabilizing inductance while maintaining the parallel wire construction efficiency.
Solution Approach 2:
The patent changes the parameter of turn distribution among winding groups to resolve the contradiction. By varying the number of turns in each winding group and strategically positioning them within the slot, the magnetic flux characteristics are optimized. This parameter adjustment reduces flux leakage and stabilizes inductance without compromising the productivity benefits of parallel wire construction.
2Reliability
If winding groups with different numbers of turns are arranged in a slot, then inductance variation can be reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the coil unit into multiple winding groups, each with a specific number of turns, arranged in a predetermined sequence within the slot. This segmentation allows for optimized magnetic flux distribution and reduced leakage, achieving inductance stability. The segmentation approach systematically manages the complexity by dividing the winding structure into manageable, functionally differentiated segments.
Solution Approach 2:
The patent applies preliminary action by pre-determining the optimal arrangement sequence of winding groups with different turn counts before actual assembly. The winding groups are prepared with specified turn numbers and positioned in advance according to the optimal configuration that minimizes flux leakage. This preliminary planning reduces manufacturing complexity by establishing a clear, predetermined assembly sequence.
3Reliability
If winding groups are arranged in descending order of turns toward the shaft, then flux leakage is reduced, but the slot space utilization becomes constrained
Solution Approach 1:
The patent applies local quality by creating a non-uniform distribution of winding groups within the slot, with fewer turns positioned closer to the shaft and more turns positioned farther away. This localized differentiation optimizes the magnetic flux path in different regions of the slot, reducing leakage flux while efficiently utilizing the available slot space through strategic positioning rather than uniform distribution.
Solution Approach 2:
The patent utilizes the radial dimension within the slot (distance from the shaft) to optimize winding group arrangement. By arranging winding groups with different turn counts at different radial positions, the patent transforms a one-dimensional space utilization problem into a multi-dimensional optimization, reducing flux leakage while maintaining efficient space utilization through three-dimensional spatial arrangement.
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 configuration reduces inductance variation due to magnetic flux leakage, stabilizing electric current flow and improving motor output by minimizing positional differences in winding groups and magnetic flux.
Implementation Method 1
a plurality of coil units are arranged respectively in the plurality of slots, the coil units each including a plurality of wires connected in parallel
Data Source
AI summary
An electric motor includes a shaft, and a stator disposed around the outer periphery of the shaft and including a plurality of slots extending toward the shaft. A plurality of coil units are arranged respectively in the plurality of slots. The coil units are each formed of a plurality of wires connected in parallel. One of the coil units that is arranged in at least one of the plurality of slots formed in the stator includes a plurality of winding groups that are connected in series and that have a different number of turns from each other. The winding groups are arranged in the slot in descending order of the number of turns in the direction toward the shaft.