Radial Fastened Rotor Balance Weights for Large Mass Unbalance
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Solution Overview
Problem
Conventional methods for fixing balance pieces to the axial end surface of rotors in electrical rotation machines, such as motors or generators, are inadequate for large mass imbalances, leading to risks of balance blocks falling off due to centrifugal forces and blocking ventilation holes, and are impractical and time-consuming.
Innovation Solution
A rotor balancing device with support members and balance weight blocks fixed via fasteners in the radial direction, utilizing laminated steel plates and surface contacts to distribute centrifugal forces effectively, ensuring secure attachment and avoiding ventilation blockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fixing means are used to attach balance blocks to the rotor end plane, then the balance block can be fixed to compensate for small imbalances, but the balance block is subject to huge centrifugal force and may fall off during operation
Solution Approach 1:
The fastener extends through the balance weight block in the radial direction of the rotor, changing the fixing direction from axial to radial. This dimensional change allows the fastening force to directly counteract the centrifugal force acting on the balance block, significantly improving fixing reliability under high centrifugal loads
Solution Approach 2:
The balance weight block is positioned on the support member at the axial end surface of the rotor, with the fastener extending through the balance weight block to secure it. This nested arrangement ensures the balance block remains firmly attached while allowing centrifugal forces to be effectively transmitted through the fastener to the support structure
2Reliability
If balance blocks are fixed on the axial end surface of the rotor, then large mass imbalance can be compensated, but the balance block may block the axial air duct of the rotor
Solution Approach 1:
The support member is specifically positioned at the axial end surface of the rotor at a location that does not interfere with the axial air duct. This localized placement allows the balance weight block to compensate for large mass imbalances while maintaining proper ventilation flow through the rotor core
Solution Approach 2:
The balance weight block is arranged in the radial direction on the axial end surface, extending outward from the rotor axis. This radial arrangement allows the balance block to be positioned away from the axial air duct path, preventing ventilation blockage while maintaining balance compensation effectiveness
3Reliability
If conventional fixing methods are used for large mass balance compensation, then the balance block can be attached, but the fixing process is impractical and time-consuming
Solution Approach 1:
The support member is pre-installed on the axial end surface of the rotor during rotor assembly, before the balance weight block needs to be attached. This preliminary preparation simplifies the subsequent balance block installation process, making it more practical and faster for large mass compensation applications
Solution Approach 2:
The support member serves multiple functions: it provides structural support for the rotor coil, serves as a mounting surface for the balance weight block, and acts as a load-bearing element for transmitting centrifugal forces. This multi-functionality eliminates the need for separate fixing structures, reducing assembly time and complexity
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 provides safe and efficient large mass balance compensation, preventing balance block detachment and ventilation blockage, while allowing easy adjustment and strengthening the fixing mechanism.
Implementation Method 1
the balance block is subject to a huge centrifugal force during operation of the electrical ration machine
Data Source
AI summary
A rotor balancing device includes a plurality of support members uniformly distributed on an axial end face of the rotor in a circumferential direction of the rotor; at least one balance weight block configured to compensate an unbalance of the rotor; and at least one fastener extending through the at least balance weight block in a radial direction of the rotor and configured to fix the at least one balance weight block to at least one of the plurality of support members in the radial direction of the rotor.