Electro-Pneumatic Spindle Drive With Two-Zone Air Cooling
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Solution Overview
Problem
Existing spindle drives in spinning machines face issues with synchronization and independent control of individual spindles, leading to performance degradation when one spindle fails, and require higher rotation frequencies that current technologies struggle to meet, especially in high-speed applications.
Innovation Solution
A hybrid electro-pneumatic drive unit is constructed with an electric engine and pneumatic engine mechanically coupled, where pneumatic engine waste air is used for cooling the electric engine, stabilizing rotation frequency and damping vibrations, allowing independent operation and efficient cooling of the electric engine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mass drive of multiple spindles by a single electric aggregate is used, then device complexity is reduced, but reliability deteriorates because failure of any spindle requires stopping the entire machine
Solution Approach 1:
The patent divides the drive system into independent electro-pneumatic drive units, with each spindle having its own separate drive mechanism. This segmentation allows individual spindles to operate independently, so that failure of one spindle does not affect others, thereby improving reliability while maintaining manageable complexity through modular design
2Device complexity
If mass drive of multiple spindles is used, then device complexity is reduced, but adaptability deteriorates because individual spindle synchronization and independent control are not possible
Solution Approach 1:
Each spindle is equipped with its own electro-pneumatic drive unit that can be independently controlled. The pneumatic engine allows for individual speed adjustment and synchronization control of each spindle, providing the necessary adaptability while maintaining a relatively simple overall system architecture through modular independent units
3Productivity
If rotation frequency of spinning rotors is increased to meet high-speed demands, then productivity is improved, but temperature increases causing overheating of the electric engine
Solution Approach 1:
The patent converts the waste heat and exhaust air from the pneumatic engine into a beneficial cooling resource. The pneumatic engine's exhaust air, which would otherwise be discarded, is directed to cool the electric engine, thereby managing the temperature increase caused by high-speed operation without requiring additional cooling systems
Solution Approach 2:
The patent merges the pneumatic and electric drive systems into a hybrid electro-pneumatic unit where the pneumatic engine's exhaust stream is integrated with the electric engine's cooling system. This combination allows the high-speed operation to be sustained by utilizing the pneumatic system's byproduct for thermal management
4Temperature
If hybrid electro-pneumatic drive is used with pneumatic engine for cooling, then temperature control is improved, but device complexity increases
Solution Approach 1:
The patent combines the pneumatic and electric drive systems into a single integrated electro-pneumatic unit where the pneumatic engine serves dual purposes: providing mechanical drive and providing cooling air for the electric engine. This merging reduces overall system complexity compared to having separate drive and cooling systems
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 hybrid drive enables independent operation of each rotor, maintains high acceleration and frequency adjustment, and optimizes cooling, ensuring uninterrupted operation even if one spindle fails, suitable for high-speed applications.
Implementation Method 1
the outgoing shafts are mechanically coupled and the output of the propulsion air from the pneumatic engine enters inside the electric engine, where it is mainly used for cooling of the electric engine
Implementation Method 2
stabilizing rotation frequency and damping vibrations
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Electro-pneumatic drive unit is realized in such a way that the central shaft (2) of the electric engine (3) formed by the stator (5) and the rotor (4) is connected with the shaft of the pneumatic engine (6) with an inbuilt turbine (7) by the serial constructional connection. Air channels of the two-zone air cooling are between the pneumatic engine (6) and the electric engine (3) arranged into circle. The pneumatic engine (6) has at least one opening for the intake of the pressure air. The two-zone air cooling consists of ribbing (9) of the first stator axial channels with the first output channel openings (13), which are alternately placed in the ribbing (9) with the second stator axial channels with the second output channel openings (15). The first stator axial channels with the first output channel openings (13) and the second stator axial channels with the second output channel openings (15) are covered by the sheath (10) of the stator (5).