Direct driving apparatus for washing machine
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Solution Overview
Problem
The direct driving apparatus in drum type washing machines operates inefficiently at low motor speeds for washing and rinsing modes due to structural limitations, making it difficult to apply a clutch or decelerating device like those used in pulsator type machines.
Innovation Solution
A driving apparatus for drum type washing machines incorporates a deceleration coupling unit with planetary gears and a lever system that allows for adjustable deceleration, enabling optimal torque and speed control by positioning the deceleration coupling unit within the stator assembly and using a shaft with splines for efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct driving apparatus is used in drum type washing machines, then the structure is simplified and reliability is improved, but the motor operates inefficiently at low speeds for washing and rinsing modes
Solution Approach 1:
The planetary gear set is nested within the motor structure, with the sun gear positioned at the center of the rotor and the planetary gears arranged around it. This nested configuration allows the deceleration mechanism to be integrated into the motor without significantly increasing external dimensions, maintaining the compactness of the direct driving apparatus while enabling low-speed high-torque operation through the planetary gear deceleration mechanism
Solution Approach 2:
The invention introduces a variable deceleration ratio mechanism that can dynamically adjust the transmission ratio between the motor and the washing machine drum. By changing the engagement state of the planetary gear set, the system can switch between different operating modes (washing, rinsing, spinning), optimizing motor efficiency for each mode while maintaining the simplicity of the direct driving structure
2Use of energy by moving object
If a clutch or decelerating device is applied to enable low-speed operation, then energy efficiency is improved, but the structural complexity increases
Solution Approach 1:
The invention merges the deceleration function with the motor structure by integrating the planetary gear set directly into the motor housing. The sun gear is positioned at the center of the rotor, and the planetary gears are mounted on the rotor outer periphery, combining the motor and decelerator into a single integrated unit. This eliminates the need for separate clutch mechanisms or external decelerating devices, maintaining structural simplicity while enabling efficient low-speed operation
Solution Approach 2:
The planetary gear set serves multiple functions: it acts as a deceleration mechanism for low-speed washing and rinsing modes, and can be disengaged to allow direct high-speed connection for spinning modes. This multi-functional design eliminates the need for separate clutch or decelerating devices, reducing structural complexity while providing optimized performance across all operating modes
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 solution enhances energy efficiency by allowing optimal deceleration ratios during washing and rinsing modes, maximizing energy use and improving operational efficiency in drum type washing machines.
Implementation Method 1
the deceleration coupling unit includes a carrier, wherein the carrier has a plurality of planetary gears installed therein
Implementation Method 2
capable of deceleration driving... allowing optimal deceleration ratios during washing and rinsing modes
Implementation Method 3
the shaft has a shaft spline formed in a position fitting into the carrier spline
Data Source
AI summary
A stator assembly constituting a motor of a driving apparatus for a washing machine, includes: a stator core; an insulator surrounding the stator core; a central space in the stator core and insulator; and a lever unit coupling for coupling a lever unit, formed in the insulator, wherein a deceleration coupling unit is positioned in the central space to be movable frontward or rearward.