Rotating Machine Winding Structure for Electromagnetic Balance
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Solution Overview
Problem
Conventional winding structures of rotating electric machines suffer from imbalance in electromotive force due to eccentric placement of the rotor and stator, leading to cyclic current generation, increased vibrations, and noise, while also complicating the winding process with excessive connections and size issues.
Innovation Solution
A winding structure featuring a core body with teeth and two coil groups connected in parallel, where each coil group consists of series-connected coils wound oppositely in direction by turns, spaced apart in the circumferential direction and opposite in the radial direction, maintaining electromagnetic balance and alleviating coil twist for easier winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parallel circuits are formed for each coil to connect series-connected coils, then electromagnetic balance is improved, but the number of connection points increases leading to deterioration in workability and increase in size
Solution Approach 1:
The patent merges multiple connection points into a single common connection point by configuring coils to share a common terminal. Specifically, multiple coils are connected in parallel with their one ends connected to different terminals and their other ends connected to a common terminal, thereby reducing the number of connection points while maintaining electromagnetic balance.
Solution Approach 2:
The common terminal serves multiple functions by being shared by multiple coils. This single terminal point handles connections for all coils in the parallel circuit, making the connection system more universal and reducing overall complexity.
2Ease of manufacture
If coils are wound in the same direction to simplify the winding process, then ease of manufacture is improved, but coil twist increases making successive winding difficult
Solution Approach 1:
The patent inverts the winding direction of adjacent coils by configuring them to be wound in opposite directions. Specifically, first and second coils adjacent to each other in the circumferential direction are wound in opposite directions, which prevents coil twist accumulation and allows successive winding to proceed smoothly.
3Ease of manufacture
If the rotor and stator are disposed eccentrically with respect to each other, then manufacturing tolerance is improved, but imbalance in electromotive force generates cyclic current causing increased vibrations and noise
Solution Approach 1:
The patent uses asymmetric coil configuration where coils are arranged and wound in opposite directions to create electromagnetic balance that compensates for mechanical asymmetry. The first and second coils are wound in opposite directions and connected in parallel, creating an asymmetric winding pattern that balances the electromagnetic forces despite eccentric positioning.
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 suppresses cyclic current generation, reduces vibrations and noise, simplifies the winding process, and downsizes the machine by allowing adjacent coils to be wound in opposite directions, improving operational efficiency and reducing manufacturing complexity.
Implementation Method 1
a winding structure of a rotating electric machine includes a core body having teeth and a winding portion wound around the teeth of the core body
Data Source
AI summary
In a stator winding, series coils are connected in parallel. One series coil includes series-connected U phase coils that are wound oppositely in direction by turns in the order in which the coils are series-connected and that are arranged in the manner that one and the other coil sets of the U phase coils are separated in the circumferential direction of a stator core and are opposite to each other in the radial direction thereof. The other series coil includes series-connected U phase coils that are wound oppositely in direction by turns in the order in which the coils are series-connected and that are arranged in the manner that one and the other coil sets of the U phase coils are separated in the circumferential direction of the stator core and are opposite to each other in the radial direction thereof.