Washing Machine Motor Rotor Core Structure for Efficient Magnetizing
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Solution Overview
Problem
Conventional spoke type permanent magnet motors for washing machines face efficiency reduction due to complex rotor designs, increased plastic resin usage, and interference during magnetizing, which affects mechanical rigidity and magnetizing efficiency.
Innovation Solution
A rotor core design with alternating rotor cores and magnets in a radial form, featuring grooves and partitions for resin introduction, and a serration for improved coupling with a frame, reducing volume and enhancing manufacturability and magnetizing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional rotor core design with completely penetrating opening parts is used, then the structure is simple to manufacture, but the motor efficiency is reduced due to increased plastic resin usage and complex form
Solution Approach 1:
The rotor core is divided into multiple segments with partition walls that create separate cavities. This segmentation allows resin to be confined in specific regions rather than requiring completely penetrating openings, reducing the amount of resin needed while maintaining structural integrity and manufacturing simplicity.
Solution Approach 2:
Instead of using a uniform rotor core design with complete openings, the invention applies local quality by creating specific cavity regions only where needed for resin introduction and magnet insertion. The partition walls are strategically placed to provide local structural support while minimizing resin usage and maintaining motor efficiency.
2Strength
If stiffeners and ribs are added to the rotor to prevent breakage during magnetizing and driving, then the mechanical rigidity is improved, but the rotor form becomes complex and interferes with the magnetizing yoke
Solution Approach 1:
The partition walls that divide the rotor core into cavities also serve as structural stiffeners. By merging the functions of cavity separation and mechanical reinforcement into a single structural element, the invention achieves the required mechanical rigidity without adding separate stiffeners and ribs that would complicate the rotor form and interfere with the magnetizing yoke.
Solution Approach 2:
The partition walls perform multiple functions simultaneously: they separate resin cavities, provide structural support to prevent rotor breakage, and maintain the compact form factor. This multi-functionality eliminates the need for additional dedicated stiffening components that would increase complexity and interfere with magnetizing operations.
3Object-affected harmful factors
If the distance between the magnet and magnetizing yoke is increased due to complex rotor form, then the interference during magnetizing is reduced, but the magnetizing efficiency is reduced
Solution Approach 1:
The rotor core is segmented into cavities that allow magnets to be positioned closer to the magnetizing yoke. The partition walls provide structural support without requiring a complex overall rotor form, enabling efficient magnetizing while preventing interference through strategic cavity placement rather than through increased distance.
4Productivity
If the rotor structure is simplified to improve magnetizing efficiency, then the magnetizing efficiency and manufacturability are improved, but the mechanical rigidity may be compromised
Solution Approach 1:
The partition walls are designed to simultaneously provide structural reinforcement and enable simplified magnet insertion cavities. This merging of functions allows the rotor to maintain mechanical rigidity while adopting a simplified form that improves magnetizing efficiency and manufacturability.
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 solution improves motor efficiency by maximizing the use of magnets, maintaining mechanical rigidity, and simplifying the rotor structure, thereby increasing magnetizing efficiency and reducing material costs.
Implementation Method 1
a rotor configured to rotate by electromagnetically interacting with the stator
Implementation Method 2
A permanent magnet motor that uses a permanent magnet for generating a magnetic field
Data Source
AI summary
A washing machine includes a motor. The washing machine includes a cabinet, a tub arranged inside the cabinet, a drum rotatively arranged inside the tub, and the motor. The motor includes a stator arranged on the rear wall of the tub, and a rotor. The stator is arranged to rotate by electromagnetically interacting with the stator. The rotor includes a plurality of rotor cores alternatingly arranged with a plurality of magnets in a radial form. Each of the rotor cores includes a body, a tooth formed in the front end part of the body, a first groove formed in the upper part of the body, and a second groove formed in the lower part of the body. A partition between the first and second grooves constitutes a part of the body providing an interval between the first and second grooves.