Direct-Drive Washer Motor Layout for Opposite Tub and Pulsator Rotation
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Solution Overview
Problem
Conventional washing machines require a complex planetary gear set and clutch spring for power transmission, increasing production costs, height, and reducing washing capacity, while also limiting the ability to rotate the pulsator and tub in opposite directions.
Innovation Solution
A washing machine driving apparatus that directly connects the drive motor to both the pulsator and washing tub, eliminating the need for a planetary gear set and clutch, and integrates a stator coupling unit on the bobbin to secure the stator directly to the outer tub, allowing independent and opposite direction rotation of the pulsator and tub.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a planetary gear set and clutch spring are used to selectively rotate the pulsator and inner tub, then the washing machine can control rotation of the pulsator and tub, but the configuration becomes complicated and production cost increases
Solution Approach 1:
The patent removes the planetary gear set and clutch spring from the washing machine drive system. Instead of using these complex mechanical components to selectively rotate the pulsator and inner tub, the invention directly drives both components through separate drive mechanisms, thereby eliminating the need for the intermediate power conversion unit and significantly simplifying the overall configuration.
Solution Approach 2:
The patent replaces the mechanical planetary gear set and clutch spring system with a more modern drive system that uses separate drive sources. This substitution eliminates the need for complex mechanical power conversion and transmission mechanisms, reducing both device complexity and production costs while maintaining the ability to independently control pulsator and tub rotation.
2Ease of operation
If a planetary gear set and clutch spring are installed between the drive motor and outer tub, then the washing machine can selectively transmit power, but the height of the washing machine increases
Solution Approach 1:
The patent extracts and removes the planetary gear set and clutch spring from the vertical space between the drive motor and outer tub. By eliminating these intermediate components, the washing machine height is reduced, allowing for more efficient use of vertical space while maintaining selective power transmission capabilities through alternative drive arrangements.
3Power
If the conventional washing machine configuration is used, then the planetary gear set can transmit power, but the washing capacity is reduced due to reduced inner tub height
Solution Approach 1:
The patent removes the planetary gear set that occupies vertical space, thereby increasing the available height for the inner tub. This extraction of the intermediate power conversion unit allows for a larger washing capacity while maintaining adequate power transmission through the simplified direct drive system.
4Ease of operation
If the conventional washing machine is configured with planetary gear set and clutch spring, then power can be selectively transmitted, but the production cost increases
Solution Approach 1:
The patent extracts and eliminates the planetary gear set and clutch spring from the design, thereby reducing the number of parts that need to be manufactured and assembled. This removal of complex intermediate components significantly reduces production costs while maintaining the functional capability to selectively rotate the pulsator and inner tub through alternative drive arrangements.
5Stability of the object's composition
If a separate component is used to secure the stator, then the stator can be fixed, but the number of parts increases and manufacturing process is complicated
Solution Approach 1:
The patent merges the stator securing function with the existing bearing housing structure. Instead of using a separate component to fix the stator, the design integrates the securing mechanism into the bearing housing, thereby reducing the total number of parts and simplifying the manufacturing process while maintaining stable stator fixation.
Solution Approach 2:
The bearing housing is given multiple functions: it supports the bearing and simultaneously serves as the securing structure for the stator. This multi-functionality eliminates the need for a dedicated stator securing component, reducing part count and simplifying the overall structure while maintaining the required stability.
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 configuration simplifies manufacturing, reduces the washing machine's height, increases washing capacity, and enhances performance by enabling independent and opposite direction rotation of the pulsator and tub, thereby improving washing efficiency.
Implementation Method 1
a first coil wound on one side of each of the stator cores; and a second coil wound on the other side of each of the stator cores
Data Source
AI summary
A washing machine driving apparatus includes: an outer shaft connected with a washing tub; an inner shaft rotatably arranged inside the outer shaft and connected with a pulsator; an inner rotor connected with the outer shaft; an outer rotor connected to the inner shaft; and a stator disposed with an air gap between the inner rotor and the outer rotor, The stator comprises: stator cores; a bobbin wrapped on the outer surface of each of the stator cores; a first coil wound on one side of each of the stator cores; and a second coil wound on the other side of each of the stator cores A first bearing and a second bearing are disposed on the outer circumferential surface of the outer shaft. The first bearing and the second bearing are mounted in a first bearing housing and a second bearing housing fixed to an outer tub.