Motor for washing machine
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Solution Overview
Problem
Existing washing machine motors face issues with unstable coupling, complex assembly processes, and reduced durability due to the use of BMC resin, leading to noise, vibration, and increased material costs.
Innovation Solution
The motor integrates a stator and rotor with a fixing bracket through injection molding, forming a compact motor housing that includes reinforced supports and a nonslip embossed surface to stabilize the motor's installation and reduce assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coupling bolts are fastened to coupling holes with screw threads in BMC resin motor housing, then the motor can be fixed to the main body, but cracks occur inside the coupling holes and fastening force decreases
Solution Approach 1:
The patent combines the motor housing and fixing bracket into a single integrated BMC resin component. The fixing bracket is formed as an integral part of the motor housing with reinforced thickness (3-5mm) at the coupling portion, eliminating the need for separate metal brackets while providing sufficient mechanical strength for stable fastening without internal cracking.
Solution Approach 2:
The patent uses BMC (Bulk Molding Compound) resin as a composite material that combines the advantages of both metal and plastic materials. The BMC resin provides both the mechanical strength needed for reliable fastening and the corrosion resistance of plastic, while the reinforced thickness at coupling holes prevents cracking under bolt fastening loads.
2Ease of operation
If separate fixing brackets are assembled to the motor housing, then the motor can be supported, but the assembling process becomes complicated and productivity is reduced
Solution Approach 1:
The motor housing and fixing bracket are merged into a single integrated component formed by one-step injection molding. This eliminates multiple assembly steps including separate bracket installation, coupling hole alignment, and bolt fastening, thereby simplifying the assembly process and significantly improving productivity.
3Ease of operation
If fixing holes and coupling holes are matched for screw assembly, then the motor can be coupled, but it is difficult to exactly match the holes and productivity is reduced
Solution Approach 1:
By integrating the fixing bracket with the motor housing, the patent eliminates the need to match and align separate fixing holes and coupling holes. The integrated structure provides pre-positioned coupling holes that are automatically aligned, removing the time-consuming hole-matching step and improving assembly efficiency.
4Strength
If aluminum is used for motor housing, then the material has good mechanical properties, but noise and vibration occur and material cost is high
Solution Approach 1:
The patent uses BMC resin as a composite material that replaces traditional aluminum motor housings. The BMC resin provides sufficient mechanical strength while inherently dampening noise and vibration, and also reduces material cost compared to aluminum, achieving a balance between mechanical properties and harmful factor reduction.
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 integration enhances the motor's stability, reduces assembly time, minimizes noise and vibration, and lowers manufacturing costs while ensuring firm fixation within the washing machine.
Implementation Method 1
forming a motor housing in which a stator and a rotor are placed integrally with a fixing bracket by injection molding simultaneously
Data Source
AI summary
The motor for a washing machine includes a motor housing having a stator, a pair of first supports formed integrally with the motor housing in the front of the motor housing, a connection cylindrical member cylindrically extending backwardly from a middle part of the motor housing to be formed integrally with the motor housing, and a pair of second supports integrally formed at right and left ends of the connection cylindrical member.