Elastic Electric Machine Mounting for Frame Vibration Control
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Solution Overview
Problem
Large electric machines designed for fixed foundations experience impermissible vibrations when mounted on less rigid frame constructions, limiting their operational speed range.
Innovation Solution
The electric machine is fastened to the frame construction via intermediate elements with spring assemblies and active actuation elements, allowing dynamic regulation to counteract vertical movements and damp vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electric machine is mounted directly on the frame construction, then the structure is simple and easy to manufacture, but excessive vibrations occur in certain speed ranges due to the flexibility of the frame
Solution Approach 1:
The patent introduces intermediate elements (vibration isolation elements) between the electric machine and the frame construction. These intermediaries absorb and dampen vibrations, preventing them from being transmitted to the frame while still providing secure mounting. This resolves the contradiction by adding a vibration-isolating layer that maintains mounting simplicity while eliminating excessive vibrations.
Solution Approach 2:
The patent changes the mechanical parameters of the connection between the electric machine and the frame by using elastic or damping materials instead of rigid fastening. This alters the stiffness and damping characteristics of the mounting system, allowing the machine to operate across the full speed range without generating excessive vibrations, thus resolving the contradiction between manufacturing simplicity and vibration control.
2Reliability
If the electric machine is designed for a fixed foundation, then vibration characteristics are optimized, but the machine cannot be adapted to flexible frame constructions
Solution Approach 1:
The patent makes the mounting system universal by designing intermediate elements that can be applied to various frame constructions and electric machine types. These vibration isolation elements provide the necessary damping and stiffness characteristics regardless of the specific application, allowing the same mounting solution to be used across different machine configurations and frame types, thus achieving both reliable vibration characteristics and mounting flexibility.
Solution Approach 2:
The intermediate vibration isolation elements serve as adaptable mediators between the electric machine and different frame constructions. They can be customized in terms of stiffness, damping, and mounting configuration to match specific application requirements, enabling the machine to maintain optimized vibration characteristics while being adaptable to various mounting scenarios including flexible frame constructions.
3Object-affected harmful factors
If the speed range is restricted to avoid impermissible vibrations, then vibration limits are met, but the operational efficiency and productivity are reduced
Solution Approach 1:
The patent changes the dynamic parameters of the mounting system by introducing vibration isolation elements with specific damping characteristics. This modifies the natural frequencies and vibration transmission characteristics of the system, allowing the electric machine to operate across the entire speed range without generating impermissible vibrations. The parameter changes in the mounting system eliminate the need for speed restrictions while maintaining vibration limits, thus preserving productivity.
4Object-affected harmful factors
If active vibration compensation systems are added to the frame construction, then vibrations can be reduced, but the device complexity and cost increase significantly
Solution Approach 1:
The patent applies beforehand cushioning by pre-installing passive vibration isolation elements at the mounting points between the electric machine and the frame construction. These elements are designed to proactively absorb and dampen vibrations before they can be transmitted to the frame and cause problems. This passive approach eliminates the need for complex active vibration compensation systems with sensors, actuators, and control electronics, achieving vibration reduction while maintaining system simplicity.
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 configuration enables the electric machine to operate across its entire speed range without excessive vibrations, effectively addressing the limitations imposed by frame construction rigidity.
Implementation Method 1
the intermediate elements in each case have a spring assembly arranged between the machine-side main parts and the frame-side main parts, via which the weight force of the electric machine is transferred from the machine-side main parts to the frame-side main parts
Implementation Method 2
the intermediate elements additionally have in each case an active actuation element, by means of which a force acting in the vertical direction can be generated between the respective machine-side main part and the respective frame-side main part
Data Source
AI summary
A machine assembly includes a load machine secured to a frame construction. An electrical machine is coupled to the load machine and drives the load machine. The electrical machine is secured to the frame construction via multiple intermediate elements. Frame-side main parts of the intermediate elements are secured to the frame construction and machine-side main parts of the intermediate elements are secured to the electric machine. Spring assemblies are respectively arranged between the machine-side main parts and the frame-side main parts for transferring a weight force of the electric machine from the machine-side main parts to the frame-side main parts.