Washing Machine Motor Stator Assembly for Rotor Concentricity
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Solution Overview
Problem
Concentricity defects between the stator and rotor in washing machine motors can lead to decreased performance and interference, due to processing errors in fixing pins and penetration holes, which also result in water penetration into the motor, causing short circuits and assembly inefficiencies.
Innovation Solution
The motor design incorporates fixing ribs and pins that are concentrically disposed, with water penetration prevention ribs to guide water away from the coils, and a connector housing integrated with the stator, reducing assembly complexity and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixing pins and penetration holes are processed separately, then assembly flexibility is improved, but processing errors cause concentricity defects between stator and rotor
Solution Approach 1:
The patent combines the fixing pin and penetration hole into a single integrated fixing rib structure. The fixing rib protrudes from the stator body and includes a concentrically disposed pin, eliminating the need for separate processing of fixing pins and penetration holes. This integration ensures precise concentricity while maintaining assembly functionality.
Solution Approach 2:
The fixing rib is pre-formed as an integral part of the stator body during stator manufacturing. The concentric pin is already positioned correctly relative to the stator center before assembly, eliminating positioning errors that would occur with separate processing and assembly steps.
2Adaptability or versatility
If multiple separate components are used for stator fixing, then assembly adjustability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple fixing components (fixing ribs, pins, and positioning features) into a single integrated structure. The fixing rib includes both the positioning pin and the fixing interface, reducing the number of separate components while maintaining assembly adjustability through the modular rib design.
3Productivity
If fixing structure is simplified, then productivity is improved, but water penetration prevention capability is reduced
Solution Approach 1:
The patent combines fixing and water protection functions into the same fixing rib structure. The rib that provides mechanical fixing also serves as a water barrier, eliminating the need for separate water sealing components and simplifying assembly while maintaining reliability.
Solution Approach 2:
The fixing rib performs multiple functions simultaneously: it provides mechanical positioning, structural fixing, and water penetration prevention. This multi-functional design reduces the number of components needed while maintaining both productivity and reliability requirements.
4Ease of operation
If separate connector housing is used, then assembly flexibility is improved, but manufacturing time increases
Solution Approach 1:
The patent integrates the connector housing directly into the stator body as a single molded piece. The connector housing is formed as an integral part of the stator during stator manufacturing, eliminating separate assembly steps while maintaining the flexibility of modular connector installation.
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 ensures precise positioning of the stator, prevents water penetration, and enhances motor durability and assembly efficiency, reducing the risk of short circuits and improving overall performance.
Implementation Method 1
a fixing pin configured to determine the position of the stator is concentrically disposed with a fixing hole
Implementation Method 2
water penetration prevention ribs to guide water away from the coils
Implementation Method 3
The rotor is configured to electromagnetically interact with the stator, and is rotated by the force acting in between a magnetic field and the current that flows at coils
Data Source
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AI summary
Washing machine (1) including a cabinet (10), a tub (20) disposed inside the cabinet (10), a drum (30) rotatably disposed inside the tub (20), and a motor (40) coupled to a rear surface of the tub (20) to drive the drum (30), wherein the motor includes a stator (100), which includes at least one fixing pin (142) inserted into the rear wall (21) of the tub (20); and at least one fixing hole (144) concentrically disposed with the at least one fixing pin (142), and a rotor (200) rotatably disposed at an inner side or at an outer side of the stator (100).