Motor Vibration Reduction Using Tuned Rod Support System
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Solution Overview
Problem
Existing electrically commutated motors face challenges in effectively reducing vibration transmission to the support structure, particularly at specific frequency ranges, which affects their operational stability and efficiency.
Innovation Solution
The motor design incorporates a support system with rods of varying lengths, cross-sectional shapes, and stiffness, coupled with support disks, to define unique natural frequencies that differ from the vibrational frequency of the magnetic core, thereby reducing vibration transmission by tuning the rods to match or counteract the motor's vibrational frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional motor mounting structures are used, then the motor can be simply constructed, but vibration transmission to the support structure is not effectively reduced
Solution Approach 1:
The support system is segmented into multiple independent rods instead of a single rigid mounting structure. Each rod acts as an independent vibration isolation element, allowing the system to reduce vibration transmission while maintaining structural support. This segmentation enables the support system to handle different vibration frequencies independently.
Solution Approach 2:
The rods are designed with specific physical parameters (length, cross-sectional area, material properties) that determine their natural frequencies. By carefully selecting these parameters, the rods' natural frequencies are tuned to differ from the motor's vibrational frequencies, creating a parameter mismatch that reduces vibration transmission through the support structure.
2Object-affected harmful factors
If rods of varying lengths and stiffness are used to reduce vibration, then vibration damping is improved, but manufacturing complexity increases
Solution Approach 1:
Different rods in the support system have different local qualities - specifically, varying lengths, cross-sectional areas, and material properties. This local differentiation allows each rod to be optimized for specific vibration frequency ranges, improving overall vibration damping performance while maintaining relatively simple individual rod constructions that are easy to manufacture.
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 approach significantly reduces vibration transmission from the stator to the motor housing, enhancing operational stability and efficiency by damping vibrations across multiple frequency ranges.
Implementation Method 1
Each of the plurality of rods includes a length, the length measured between a first end fixedly attached to the first support disk and a second end fixedly attached to the second support disk, a cross-sectional shape, a cross-sectional area, and a stiffness that cooperate to define a natural frequency. The length of one of the plurality of rods is different from the length of another of the plurality of rods.
Implementation Method 2
tuning the frequency of each of the plurality of rods to be different from the vibrational frequency of the magnetic core
Data Source
Figure 1a~1c
Figure 1d~1f
Figure 2~3
AI summary
A motor includes a rotor supported for rotation about a longitudinal axis, a stator including a magnetic core, a first end plate positioned at a first end of the magnetic core, and a second end plate positioned at a second end of the magnetic core. The magnetic core, first end plate, and second end plate cooperate to define a central opening. The motor also includes a plurality of rods each fixedly attached to the first end plate and the second end plate and including a first end that extends along the longitudinal axis beyond the first end plate and a second end that extends along the longitudinal axis beyond the second end plate. A first support disk is coupled to the first end of each of the rods and a second support disk is coupled to the second end of each of the rods.