Stator Winding Jumper Wire Straddling for Torque and Noise
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Solution Overview
Problem
Rotating electrical machines in electric vehicles face challenges in achieving high torque while minimizing noise levels.
Innovation Solution
The design incorporates a stator core with multiple slots and a stator winding featuring round windings wound in a wave pattern, with jumper wires connecting different layers, including those with straddling amounts of (N+1) and {(N+1)±1} slot pitches, to optimize torque generation and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional winding techniques are used, then the structure is simple and easy to manufacture, but the torque is low and noise is high
Solution Approach 1:
The patent applies parameter changes by modifying the winding configuration parameters: using six or more layers of round windings per slot, implementing specific jumper wire straddling amounts of (N+1) and {(N+1)±1} slot pitches, and arranging windings in a wave pattern. These parameter changes optimize the magnetic field distribution to reduce torque ripple and noise while maintaining high torque output.
Solution Approach 2:
The patent implements local quality by creating different winding arrangements in different regions. The jumper wires connect round windings across different layers with specific straddling amounts, creating localized variations in the magnetic field that reduce overall noise and torque ripple while maintaining high torque generation capability.
2Object-generated harmful factors
If six or more layers of round windings are used with specific jumper wire configurations, then torque ripple is reduced and noise is lowered, but the winding structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the winding structure into multiple discrete layers (six or more) with distinct jumper wire connections. Each layer and jumper wire configuration acts as a separate segment that can be independently arranged to achieve the desired (N+1) and {(N+1)±1} slot pitch straddling amounts, reducing noise while maintaining manageable complexity through modular construction.
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 enables the achievement of high torque with reduced noise levels, as demonstrated by the comparison with comparative examples, resulting in a rotating electrical machine with improved torque ripple and noise characteristics.
Implementation Method 1
a stator winding having a plurality of round windings wound in a wave winding such that a winding conductor is inserted through each of the plurality of slots in six layers or more
Data Source
AI summary
A rotating electrical machine capable of achieving a high torque and low noise is provided. In a stator for a rotating electrical machine in which six or more slot conductors are inserted through one slot, the stator for a rotating electrical machine straddles slots such that a slot pitch of a jumper wire connecting round windings having different positions in a radial direction has at least two kinds or more different slot pitches.