Washing Machine Mode Shifter Control With Integrated Motor PWM
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Solution Overview
Problem
Existing washing machines face increased manufacturing costs and electrical coupling issues due to the need for multiple wires to power the motor and mode shifter, which can lead to overheating and operational failures from constant alternating current voltage.
Innovation Solution
A motor controller is affixed to the motor and electrically coupled to both the motor and mode shifter, reducing wiring and providing pulse width modulated direct current voltage to limit power to the mode shifter, preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power sources are used for the motor and mode shifter with additional wires extending through the washing machine cabinet, then the motor and mode shifter can be independently powered, but manufacturing costs increase and electrical coupling problems occur
Solution Approach 1:
The patent combines the motor controller and mode shifter controller into a single integrated control unit. This merging eliminates the need for separate power sources and reduces wiring complexity by consolidating control functions, directly resolving the contradiction between electrical coupling reliability and wiring complexity
Solution Approach 2:
The integrated control unit performs multiple functions: it controls both the motor and mode shifter, and can convert between AC and DC voltage as needed. This multi-functionality replaces what previously required separate dedicated controllers and power sources, reducing overall system complexity while maintaining reliability
2Duration of action of stationary object
If the mode shifter is powered by alternating current voltage with constant power, then the mode shifter can operate continuously, but the mode shifter overheats and the washing machine may become inoperable
Solution Approach 1:
The patent implements dynamic power control for the mode shifter using pulse width modulation (PWM). Instead of constant AC power, the controller dynamically adjusts the power delivery to match actual operational needs, allowing the mode shifter to operate continuously without overheating by reducing power during idle or low-demand periods
Solution Approach 2:
The controller changes the electrical parameters supplied to the mode shifter by converting from constant AC voltage to variable DC voltage with PWM control. This parameter change allows precise control of power delivery, maintaining operational continuity while preventing temperature buildup through reduced average power consumption
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 reduces wiring within the washing machine, minimizes overheating, and ensures efficient operation by controlling the power supplied to the mode shifter, thereby enhancing the reliability and maintainability of the appliance.
Implementation Method 1
a mode shifter including a solenoid
Implementation Method 2
providing a pulse width modulated direct current voltage to the mode shifter for facilitating limiting power received by the mode shifter
Data Source
AI summary
A method for assembling a washing machine is provided. The method includes providing a mode shifter including a solenoid, coupling a basket and an agitator to the mode shifter, and coupling a motor to the mode shifter. The solenoid selectively allows the motor to rotate at least one of the basket and the agitator. The method also includes affixing a motor controller to the motor, and electrically coupling the motor controller to each of the mode shifter and the motor. The motor controller is in operational control communication with the mode shifter and the motor.