Motor Shaft Support With Damping Liquid for High-Speed Vibration Control
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Solution Overview
Problem
The vibration of the motor rotating shaft limits the rotation rate of motors, especially at high speeds, due to unbalanced excitation and high supporting stiffness, which affects the motor's performance and efficiency.
Innovation Solution
A motor design incorporating a supporting piece with an accommodating cavity for damping liquid, allowing elastic deformation and oil film damping to buffer vibrations, reducing supporting stiffness and enhancing vibration suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the supporting stiffness is increased to reduce vibration, then the motor rotating shaft vibration is suppressed, but the rotation rate is limited and power density is reduced
Solution Approach 1:
The patent changes the physical state of the supporting structure by introducing damping liquid that can transition between liquid and gel states. In the gel state, the supporting piece provides high stiffness to suppress vibration, while in the liquid state, it allows higher rotation rates. This parameter change resolves the contradiction by making the supporting stiffness adjustable rather than fixed.
Solution Approach 2:
The patent makes the supporting structure dynamic by allowing it to transition between different states (liquid and gel) based on operating conditions. The damping liquid's viscosity and state can change dynamically in response to temperature, frequency, or other parameters, enabling the system to adapt to different rotation rates and vibration levels, thus resolving the static contradiction between stiffness and rotation rate.
2Stability of the object's composition
If the supporting stiffness is increased to suppress vibration, then the motor stability is improved, but the power density and volume are reduced
Solution Approach 1:
By changing the physical parameters of the damping liquid (viscosity, state transition between liquid and gel), the patent achieves high stability during operation without permanently increasing the supporting structure's stiffness. This allows the motor to maintain high power density while achieving vibration suppression through parameter adjustment rather than structural enlargement.
3Reliability
If the supporting stiffness is increased to reduce vibration, then the motor reliability is improved, but the material cost and weight are increased
Solution Approach 1:
The patent uses damping liquid (a fluid medium) to provide the supporting and vibration suppression function. This hydraulic approach replaces traditional heavy mechanical supporting structures with a lighter fluid-based system that achieves the same or better reliability through viscous damping and state transition mechanisms.
Solution Approach 2:
The patent employs composite functionality by combining the damping liquid with the supporting piece structure, creating a hybrid system that leverages both the structural support of the piece and the viscous damping properties of the liquid. This composite approach achieves high reliability without the weight penalty of purely mechanical supporting structures.
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 design enables higher power density, smaller volume, and lower weight by allowing high-speed rotation while effectively suppressing vibrations, thus improving motor performance and reducing material costs.
Implementation Method 1
the supporting piece is provided to undergo elastic deformation under the abutment of the motor rotating shaft
Implementation Method 2
A first aspect of the present disclosure provides a motor, including a motor rotating shaft, a supporting piece and a housing, wherein the housing includes a motor end cover, and the supporting piece is supported between an outer peripheral side of the motor rotating shaft and the motor end cover; wherein an accommodating cavity configured to accommodate a damping liquid is provided inside the supporting piece
Data Source
AI summary
A motor includes a motor rotating shaft, a supporting piece and a housing, and the housing includes a motor end cover, the supporting piece is supported between the outer peripheral side of the motor rotating shaft and the motor end cover, and an accommodating cavity suitable for accommodating damping liquid is provided inside the support, and the supporting piece is provided to be elastically deformed under the abutting of the motor rotating shaft.