Fans-motor assembly for condenser laundry dryer machine and condenser laundry dryer machine comprising said assembly
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Solution Overview
Problem
Laundry dryer machines of the condenser type face limitations in thermal efficiency and increased humidity due to the large dimensions of traditional asynchronous motors, leading to high production costs and maintenance challenges.
Innovation Solution
A fans-motor assembly using a synchronous permanent magnet electric motor with an internal stator and external rotor, allowing for increased torque density and reduced motor dimensions, along with a belt tightener mechanism that simplifies belt tensioning and reduces the need for costly cabling connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional asynchronous motor is used, then the motor can provide sufficient torque for drum rotation, but the motor dimensions become large leading to high production costs and maintenance challenges
Solution Approach 1:
The patent changes the fundamental parameters of the motor by switching from an asynchronous motor to a synchronous permanent magnet motor. This parameter change enables higher torque density, allowing the motor to deliver the same torque with significantly reduced dimensions and active material quantity.
Solution Approach 2:
The patent employs composite construction by integrating the permanent magnet rotor with the drive shaft as a single composite component. This eliminates the need for a separate rotor assembly and reduces overall motor dimensions while maintaining torque output.
2Ease of manufacture
If the motor dimensions are reduced, then production costs decrease, but the torque density must be increased to maintain sufficient torque for drum rotation
Solution Approach 1:
The patent achieves higher torque density by changing the motor type to synchronous permanent magnet, which inherently provides higher torque per unit volume. This parameter change directly addresses the need for increased torque density while enabling smaller, more cost-effective motor dimensions.
Solution Approach 2:
The patent extracts the rotor from the motor assembly and integrates it with the drive shaft, eliminating redundant components. This extraction and integration reduces the overall motor dimensions and active material requirements, thereby lowering production costs while maintaining torque output.
3Ease of operation
If the stator is mounted rotatingly on the frame by means of bushings, then the motor can be positioned centrally, but the bushings wear rapidly requiring inconvenient maintenance operations
Solution Approach 1:
The patent inverts the traditional mounting arrangement by making the stator stationary and integrated with the machine frame, while the rotor (integrated with the drive shaft) rotates. This inversion eliminates the need for bushings to support the stator, thereby eliminating rapid wear and frequent maintenance requirements.
4Volume of moving object
If the motor cannot be directly associated with the control board, then the control board must be installed in another position and connected by costly cabling that can be damaged
Solution Approach 1:
The patent merges the control board with the motor assembly by integrating it into the stationary stator housing. This merging eliminates the need for external cabling connections, reducing the risk of damage and lowering manufacturing costs associated with cable installation and protection.
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 reduces production costs and overall dimensions of the motor while maintaining necessary torque for drum rotation, allowing for more efficient and compact designs with improved maintenance and reduced noise levels.
Implementation Method 1
a permanent magnet electric motor, preferably synchronous, comprising an internal stator traversed by said drive shaft and an external rotor integral during rotation with said drive shaft designed to move it to rotate
Data Source
AI summary
A fans-motor assembly for condenser laundry dryer machine, of unusually low cost and overall dimensions, comprising: a drive shaft which can be associated in a rotating manner with a frame of a laundry dryer machine and designed to be connected by means of a transmission belt to a rotating drum thereof; a fan for the hot air and a fan for the cold air integral in rotation with said drive shaft and designed to convey respectively a flow of hot air and a flow of cold air along separate paths of said laundry dryer machine; a synchronous permanent magnet electric motor comprising an internal stator traversed by said drive shaft and an external rotor integral during rotation with said drive shaft.