2-Pole 12-Slot Motor Winding Layout for High-Speed Rotation
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Solution Overview
Problem
Existing rotating electric machines face challenges in achieving high-speed rotation due to the need for a higher number of poles, which complicates the winding configuration and makes it difficult to achieve efficient high-speed operation.
Innovation Solution
A rotating electric machine with a 2-pole and 12-slot configuration, where windings of the same phase are wound in the same direction around adjacent teeth, and the teeth are arranged such that adjoining teeth portions are different in phase, allowing for a simply-structured and small-sized design capable of high-speed rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the number of poles is increased to achieve proper winding configuration, then the winding structure becomes more stable, but the rotation speed decreases
Solution Approach 1:
Instead of increasing the number of poles to achieve proper winding configuration, the patent inverts the approach by using the minimum number of poles (2 poles) and achieving proper phase differentiation through the arrangement of teeth portions. The adjacent teeth portions are configured with different phases (e.g., 60 degrees apart), which enables correct winding configuration without increasing pole count, thus maintaining high rotation speed while ensuring winding stability.
2Speed
If the number of poles is reduced to two for high speed rotation, then the rotation speed increases, but the winding configuration becomes more complex
Solution Approach 1:
The patent divides the stator core into multiple teeth portions (first, second, third, fourth teeth portions) with adjacent teeth portions having different phases. This segmentation allows the winding configuration to be simplified by assigning specific phases to specific teeth portions, making the overall winding arrangement more manageable despite the reduced pole count. The segmented approach to phase assignment reduces the complexity of achieving proper winding configuration with only 2 poles.
3Quantity of substance
If windings are wound in opposite directions around adjacent tooth portions, then the phase differentiation is achieved, but the number of poles must be increased
Solution Approach 1:
Instead of using opposite winding directions for all adjacent tooth portions, the patent applies local quality by assigning specific phases to specific teeth portions based on their position. For example, the first and third teeth portions have one phase while the second and fourth teeth portions have another phase, with adjacent teeth portions being 60 degrees apart. This localized phase assignment achieves proper phase differentiation without requiring increased pole count or complex opposite-direction winding throughout.
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 proposed configuration enables high-speed rotation by minimizing the number of poles to two, facilitating efficient operation and reducing the complexity of the winding structure.
Implementation Method 1
a stator core (10) including a yoke portion (12) having a cylindrical shape and twelve teeth (16) each protruding radially inward from the inner circumferential surface of the yoke portion (12); and coils (20) of three phases, a winding being concentratedly wound around each of the teeth (16) to form each of the coils (20)
Data Source
AI summary
An electric motor includes a stator and a rotor rotatable relative to the stator. The stator includes: a stator core including a yoke portion having a cylindrical shape and twelve teeth each protruding radially inward from the yoke portion; and coils of three phases, a winding being concentratedly wound around each of the teeth to form each of the coils. The number of poles of the rotor is two. The teeth include two teeth located adjacent to each other in a circumferential direction and forming a teeth portion, and windings of a same phase are respectively wound in a same direction around the two teeth forming the teeth portion and are connected in series. The teeth are arranged such that the teeth portions adjacent to each other are different in phase and the three phases are arranged sequentially side by side in the circumferential direction.