Stator Auxiliary Coil Layout for Maintenance-Free Sensor Power
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Solution Overview
Problem
Existing electric machine assemblies with auxiliary devices require maintenance for batteries or external power sources, complicating the system.
Innovation Solution
A stator with an auxiliary coil around a stator tooth, formed separately from the stator core, using a flexible printed circuit board winding, which eliminates the need for maintenance and can be adapted for various electric machine sizes through transverse tooth gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If batteries or external power sources are used to provide energy for auxiliary devices, then energy supply is achieved, but maintenance requirements increase and system complexity increases
Solution Approach 1:
The auxiliary coil generates electrical energy autonomously by utilizing the magnetic flux already present during the operation of the electric machine. This self-service mechanism eliminates the need for external batteries or power sources, and consequently removes maintenance requirements associated with those components.
Solution Approach 2:
The auxiliary coil serves multiple functions: it provides energy for auxiliary devices while also being adaptable to different electric machine sizes through the use of transverse tooth gaps. This multi-functionality reduces system complexity by consolidating power generation and adaptation capabilities into a single component.
2Use of energy by moving object
If batteries or external power sources are used to provide energy for auxiliary devices, then energy supply is achieved, but device complexity increases
Solution Approach 1:
The auxiliary coil is integrated directly into the stator structure of the electric machine, merging the energy generation function with the existing machine components. This consolidation eliminates separate batteries or external power source connections, thereby reducing overall system complexity.
3Reliability
If a separately formed auxiliary coil is used around a stator tooth, then maintenance is eliminated, but manufacturing complexity increases
Solution Approach 1:
The auxiliary coil is designed as a separate, modular component that can be manufactured independently and then installed around specific stator teeth. This segmentation allows for specialized manufacturing techniques (such as using flexible printed circuit board windings) while simplifying the overall assembly process through standardized installation procedures.
4Adaptability or versatility
If transverse tooth gaps are provided for auxiliary coils, then adaptability to different electric machine sizes is achieved, but manufacturing precision requirements increase
Solution Approach 1:
Transverse tooth gaps are provided only in specific stator teeth where auxiliary coils are required, rather than throughout the entire stator structure. This localized approach allows for adaptability to different machine sizes while concentrating manufacturing precision requirements only to the necessary locations, reducing overall complexity.
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
The auxiliary coil provides energy for auxiliary devices without maintenance, enabling efficient operation across different electric machine sizes and functions as a sensor, simplifying the electric machine assembly.
Implementation Method 1
The auxiliary coil (4) is adapted to generate an auxiliary coil voltage during operation of the electric machine
Data Source
Figure 1~2
Figure 3~4
Figure 5A~7
AI summary
A stator for an electric machine comprising a stator core (2) comprising an outer shell (22), a plurality of stator teeth (24) and a plurality of stator slots (26), wherein the plurality of stator slots (26) is adapted to receive a stator winding of the electric machine; at least one auxiliary coil (4) located adjacent to the stator core (2), and adapted to generate an auxiliary coil voltage during operation of the electric machine. The at least one auxiliary coil (4) is located around at least a portion of one of the plurality of stator teeth (24) such that said at least a portion of one of the plurality of stator teeth (24) extends inside the at least one auxiliary coil (4).