Large-Diameter Motor Assembly with Segmented Rotor Pole Insertion
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Solution Overview
Problem
The assembly of large-diameter electric motors is complicated by the strong magnetic pulling force at the air gap between the stator and the rotor, making it challenging to transport and assemble these motors efficiently.
Innovation Solution
The method involves dividing the stator and rotor into segments, splicing these segments to form coaxially assembled stators and rotor supports with a predetermined radial gap, and inserting magnetic pole modules into this gap for assembly, thereby minimizing the impact of magnetic forces during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the large-diameter electric motor is divided into segments for transportation, then the transportation feasibility is improved, but the assembling complexity increases due to magnetic pulling force
Solution Approach 1:
The stator and rotor are divided into multiple segments (first stator segment, second stator segment, first rotor segment, second rotor segment) that can be transported separately and then assembled on-site. This segmentation enables transportation of large-diameter motors that would otherwise exceed road transportation limits.
Solution Approach 2:
The stator segments are pre-assembled into a complete stator structure, and the rotor segments are pre-assembled into a complete rotor structure before on-site installation. This preliminary assembly reduces the complexity of the final on-site assembly process by preparing components in a controlled environment.
2Use of energy by moving object
If the stator and rotor are assembled with small air gap for performance, then the motor efficiency is improved, but the magnetic pulling force increases making assembly difficult
Solution Approach 1:
The rotor is divided into multiple segments that are assembled separately and then joined to form the complete rotor. This segmentation allows the rotor to be assembled without experiencing the full magnetic pulling force that would act on a complete rotor, making the assembly process feasible while maintaining the required small air gap for efficient operation.
Solution Approach 2:
The rotor segments are pre-assembled into a complete rotor structure before being installed with the stator. This preliminary assembly of rotor segments allows the magnetic circuit to be completed in a controlled manner, enabling the achievement of small air gap for high efficiency while avoiding the difficulty of assembling a complete rotor against strong magnetic forces.
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 approach allows for the convenient assembly of large-diameter electric motors by reducing the influence of magnetic pulling forces, improving the uniformity of the air gap, and simplifying the assembly process.
Implementation Method 1
there is a large magnetic pulling force at an air gap between a stator and a rotor of the large-diameter electric motor
Data Source
AI summary
The present disclosure relates to a method for assembling a large-diameter electric motor, the method includes: a preparing step: providing two or more stator segments for forming a stator and two or more rotor support segments for forming a rotor support; a splicing step: splicing the two or more stator segments and the two or more rotor support segments in a predetermined manner to form the stator and the rotor support that are coaxially assembled, respectively, and maintaining a predetermined gap between the stator and the rotor support in a radial direction; and an assembling step: inserting a plurality of magnetic pole modules into the predetermined gap, and assembling the plurality of magnetic pole modules to a mounting surface of the rotor support.