Magnetically Active Unit Winding Layout for Flexible Transformation Ratios
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Solution Overview
Problem
Existing rotating electric machines, particularly doubly fed asynchronous machines, face limitations in achieving optimal winding transformation ratios due to standard configuration constraints, which hinders flexible implementation of customer requirements in wind energy applications.
Innovation Solution
A magnetically active unit with a laminated core and windings arranged in a distributed two-layer fractional-slot wave or preformed coil lap winding configuration, allowing for a non-integer number of holes based on the product of phases and poles, enabling flexible adjustment of the winding transformation ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard configuration constraints are used for windings in rotating electric machines, then manufacturing and assembly are simplified, but the winding transformation ratio cannot be optimally adjusted to meet customer requirements
Solution Approach 1:
The winding is divided into multiple coil groups arranged in different slots, with each coil group having a specific number of coils. By segmenting the winding into modular coil groups that can be independently configured, the patent enables flexible adjustment of the winding transformation ratio while maintaining manageable manufacturing complexity through standardized modular units
Solution Approach 2:
Different coil groups are assigned different numbers of coils based on their specific slot positions and functional requirements. This local differentiation allows the winding transformation ratio to be optimized for specific application requirements while other parts of the machine remain standardized, balancing adaptability with manufacturing simplicity
2Adaptability or versatility
If windings are arranged in distributed two-layer fractional-slot wave or preformed coil lap winding configuration, then additional electric winding transformation ratios are enabled, but the manufacturing and assembly process becomes more complex
Solution Approach 1:
Coils are preformed as complete assemblies with predetermined configurations before being installed in the machine. This preliminary preparation allows complex winding arrangements to be manufactured separately under controlled conditions and then assembled into the final machine, reducing on-site manufacturing complexity while maintaining the ability to achieve additional transformation ratios
Solution Approach 2:
The two-layer winding structure nests coils within slots in a hierarchical arrangement, with each layer containing specific coil groups. This nested configuration allows multiple transformation ratios to be achieved through the layered structure without proportionally increasing manufacturing complexity, as the nested pattern provides a systematic framework for assembly
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 enhances the flexibility and functionality of rotating electric machines by allowing additional electric winding transformation ratios, improving the utilization of wind energy applications and meeting customer requirements more effectively.
Implementation Method 1
The stator, and frequently also the rotor, in each case have a winding through which an electric current flows
Implementation Method 2
The stator and the rotor of the rotating electric machine are linked by means of a magnetic flux as a result of which, in motor mode, the dynamic effect or the torque to drive the rotor in a rotary manner relative to the stator is generated
Data Source
AI summary
A magnetically active unit of an electric machine with at least two poles includes a laminated core with slots, and at least one winding for each of the phases. The windings have an electric conductor which forms coil groups in the slots. The coils of the coil groups are formed with at least two sections of the electric conductors of at least one of the windings and are arranged so as to be electrically insulated from each other in the grooves. At least one first coil group of the coil groups of one of the windings has a first number of coils which deviates from a second number of coils of a second coil group of the coil groups of the same winding.