Concentrated Winding Stator With Auxiliary Pole Flux Saturation
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Solution Overview
Problem
Existing variable flux motors face limitations in design freedom due to rotor centrifugal force considerations, leading to suboptimal efficiency under varying load conditions.
Innovation Solution
A stator with a concentrated winding and auxiliary pole structure, where the auxiliary pole is magnetically saturated under high load to increase flux linkage, while maintaining efficiency under low load by leveraging soft magnetic materials with different saturation and permeability properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a bypass path for diverting magnetic flux is provided in the rotor, then high efficiency under low load and high load is achieved, but design freedom is limited due to rotor centrifugal force considerations
Solution Approach 1:
The patent inverts the conventional approach by moving the variable flux structure from the rotor to the stator. The stator now contains the auxiliary poles and bypass paths, while the rotor maintains its conventional simple structure with permanent magnets. This inversion allows the complex variable flux mechanism to be implemented without being constrained by rotor centrifugal forces, thereby achieving high efficiency across varying load conditions while preserving design freedom.
Solution Approach 2:
The patent introduces auxiliary poles as intermediary elements in the stator that create alternative magnetic flux paths. These auxiliary poles act as mediators that can divert or guide magnetic flux between the main poles and the rotor, enabling variable flux control without modifying the rotor structure. This intermediary mechanism achieves the desired efficiency improvement while maintaining rotor simplicity and design flexibility.
2Power
If the auxiliary pole is magnetically saturated under high load, then flux linkage of the winding is increased, but this requires careful material selection and design
Solution Approach 1:
The patent utilizes changes in magnetic saturation parameters of the auxiliary pole material to achieve variable flux linkage. Under low load conditions, the auxiliary pole operates in a linear magnetic region, allowing flux diversion. Under high load conditions, the auxiliary pole reaches magnetic saturation, which blocks the bypass path and increases main flux linkage. This parameter-based control mechanism enables adaptive flux management without complex additional components.
Solution Approach 2:
The patent employs composite magnetic material structures in the stator, combining materials with different magnetic properties in the main poles and auxiliary poles. This allows optimization of each region's magnetic characteristics - the auxiliary poles use materials with specific saturation points to control flux diversion, while main poles use materials optimized for high flux density. This composite approach achieves the desired flux linkage characteristics while managing material selection complexity through functional differentiation.
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 stator design enhances motor efficiency under both low and high loads by increasing flux linkage and reducing copper loss, with improved torque and reduced field weakening current.
Implementation Method 1
the stator is configured to increase flux linkage of the winding further than under low load upon the auxiliary pole being magnetically saturated under high load
Data Source
AI summary
Provided is a concentrated winding stator which includes: a winding; a plurality of main poles; and an auxiliary pole, in which the winding is wound around the plurality of main poles, the auxiliary pole is provided between the plurality of main poles, and the stator is configured to increase flux linkage of the winding further than under low load upon the auxiliary pole being magnetically saturated under high load.