Electric Machine Asymmetric Stator Teeth Torque
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Solution Overview
Problem
The manufacturing costs of electrical machines are high due to complex coil winding processes, and existing designs do not efficiently optimize magnetomotive force and torque production.
Innovation Solution
A synchronous machine design where not all stator teeth are wound with coils, with wider main stator teeth and narrower auxiliary stator teeth, allowing for increased magnetomotive force and torque without coil saturation, and simplifying the manufacturing process by reducing the number of coils required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If coils are wound around every stator tooth, then the magnetomotive force and torque production are maximized, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The stator teeth are segmented into two distinct types: wound stator teeth with coils and unwound stator teeth without coils. This segmentation allows the machine to achieve adequate torque production while significantly reducing the number of coils required, thereby simplifying manufacturing processes and reducing costs.
Solution Approach 2:
Different stator teeth are given different properties - some teeth have coils wound around them while others remain unwound. This local differentiation optimizes the distribution of magnetomotive force across the stator, maintaining effective torque production in critical areas while reducing overall complexity.
2Ease of manufacture
If the number of coils is reduced, then manufacturing costs decrease, but the magnetomotive force and torque production may be compromised
Solution Approach 1:
The width of wound stator teeth is increased compared to unwound stator teeth. This parameter change compensates for the reduced number of coils by enhancing the magnetomotive force generation capability of the wound teeth, thereby maintaining adequate torque production while reducing overall manufacturing costs.
Solution Approach 2:
The stator teeth are designed with asymmetric width distribution - wound stator teeth are wider than unwound stator teeth. This asymmetric design optimizes the magnetic flux distribution and magnetomotive force generation, ensuring that the reduced number of coils does not compromise torque production.
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 design increases the average torque by approximately 6.4% and reduces manufacturing costs by simplifying the coil winding process while maintaining or improving magnetic flux and torque performance.
Implementation Method 1
The rotor has a plurality of rotor poles, which are preferably formed by means of permanent magnets
Implementation Method 2
a coil is wound around each stator tooth, where N is a natural number
Implementation Method 3
a magnetomotive force (MMK), which can be formed by means of an electrical current supply to the coils
Data Source
Figure 1
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Figure 3
AI summary
The electric machine (101) has a rotatably mounted rotor (103) provided with a rotor poles (107). The stator (109) is arranged with stator teeth (111). The coil (113) is wound between two stator teeth. The width of the two wound stator teeth is greater than a width of the uncoiled stator tooth. The phase is assigned to the coil. Each phase is connected with power converter. The ratio of the width of a wound stator tooth to the width of the stator tooth uncoiled is set to specific value.