Coaxial Direct-Drive Dryer Layout for Low-Loss Airflow
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Solution Overview
Problem
Existing dryers with belt-type drives face challenges in implementing a direct-drive system due to complex motor support structures and inefficiencies in power transfer, leading to increased power loss and reduced airflow efficiency.
Innovation Solution
A Direct Drive (DD) dryer design that stabilizes the motor by mounting it in the rear case, using an outer rotor motor with a stator fixed to the rear case, and a decelerator system that transforms high-RPM low-torque into low-RPM high-torque, allowing for independent control of drum and fan RPMs, while minimizing airflow resistance and maximizing airflow volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a belt-type power transfer system is used to drive the drum, then the motor can be positioned separately from the drum axis, but power loss occurs and additional space is required for the motor and power transfer components
Solution Approach 1:
The motor is merged with the drum by positioning the motor shaft coaxially with the drum rotation axis, eliminating the belt and pulley system. The motor directly drives the drum through shared rotational movement, reducing power transfer losses and simplifying the drive mechanism.
Solution Approach 2:
The motor is extracted from the traditional separate positioning and relocated to the rear case, with its shaft aligned coaxially with the drum. This repositioning removes the need for intermediate power transfer components like belts and pulleys, directly connecting the motor's rotational output to the drum.
2Device complexity
If a belt-type power transfer system is used, then motor and drum can be independently positioned, but a separate space is needed within the case to install the motor and power transfer part
Solution Approach 1:
The motor and drum are merged into a coaxial arrangement where the motor shaft and drum rotation axis coincide. This eliminates intermediate power transfer components and reduces the space required for housing these components within the case.
Solution Approach 2:
The motor is repositioned to the rear case with its shaft extending forward to align with the drum axis. This spatial reconfiguration utilizes the rear case space more efficiently, eliminating the need for separate power transfer mechanisms and reducing overall case volume requirements.
3Volume of stationary object
If the motor is positioned inside the case with the drum, then the structure is compact, but airflow resistance increases due to the motor being in the circulation flow path
Solution Approach 1:
The motor is extracted from the internal case space and repositioned to the rear case. This removes the motor from the air circulation flow path, eliminating airflow resistance caused by the motor while still maintaining a compact overall structure through efficient spatial arrangement.
4Loss of energy
If a direct-drive system is implemented, then power loss is reduced and energy efficiency improves, but the motor support structure becomes complex and stable motor mounting is difficult to achieve
Solution Approach 1:
The rear case serves multiple functions: it houses the motor, provides structural support for the motor mounting, and maintains the coaxial alignment between the motor shaft and drum rotation axis. This multi-functional design simplifies the motor support structure while achieving stable motor mounting and direct-drive efficiency.
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 DD dryer achieves stable motor support, reduced power loss, improved airflow efficiency, and enhanced drying performance by enabling three-dimensional air flow and optimal motor efficiency, while maintaining a compact design and simplifying manufacturing.
Implementation Method 1
a decelerator system that transforms high-RPM low-torque into low-RPM high-torque
Implementation Method 2
A Direct Drive (DD) dryer design that stabilizes the motor by mounting it in the rear case, using an outer rotor motor
Data Source
AI summary
The present application relates to a dryer comprising: a case forming the exterior thereof; a drum which is provided inside the case and which accommodates an object to be dried; and a driving part which is provided so as to drive the drum and which includes a motor having a stator and a rotor, wherein the case includes a rear case forming the exterior of the rear part of the dryer, the rotor is supported to be coaxially rotatable with a rotational axis of the drum with respect to the rear case on the outer side of the rear case, and the stator is fixed to the rear case on the outer side of the rear case.