Angle Measuring Device With Centrifugal Pendulum Damping
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Solution Overview
Problem
Angle measuring devices used in conjunction with electric motors often experience reduced measurement accuracy due to vibrations, leading to inferior performance in machine tools and printing machines, and excessive motor currents causing inefficiencies and noise.
Innovation Solution
An angle measuring device with a pendulum mass connected to the stator, designed to act as a centrifugal pendulum or absorber, providing damping effects across a wide frequency range, and featuring multiple pendulum masses arranged symmetrically with elastic connections to reduce vibrations and maintain measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the angle measuring device uses a rigid connection to ensure measurement stability, then measurement precision is improved, but the device becomes sensitive to vibrations and resonances
Solution Approach 1:
The patent converts the harmful vibrations into beneficial damping effects by introducing a pendulum mass that oscillates in response to vibrations. The pendulum mass absorbs vibrational energy through its own oscillations, transforming the harmful vibrations into a controlled damping mechanism that protects the measurement system while maintaining precision.
Solution Approach 2:
The pendulum mass acts as an intermediary element between the rigid measurement components and the external vibrations. It mediates the interaction by absorbing and dissipating vibrational energy, preventing direct transmission of harmful vibrations to the measurement system while maintaining the rigid connection needed for accurate measurements.
2Measurement precision
If compensating couplings are made torsionally rigid to improve measurement accuracy, then measurement precision is improved, but vibrations and resonances are amplified
Solution Approach 1:
The pendulum mass converts the problematic vibration-stability conflict into a beneficial damping system. By allowing controlled oscillations of the pendulum mass, the system transforms potential resonance amplification into active vibration damping, maintaining both measurement accuracy and vibration stability simultaneously.
3Stability of the object's composition
If vibration damping elements are added to reduce vibrations, then vibration stability is improved, but device complexity increases
Solution Approach 1:
The patent achieves vibration damping by changing the dynamic parameters of the system through the pendulum mass. Rather than adding complex passive damping elements, the solution modifies the system's natural frequency and damping characteristics through the pendulum's mass and suspension parameters, providing effective vibration reduction with minimal structural 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 significantly improves measurement behavior by damping vibrations, ensuring accurate angular position measurement over a large frequency range without reducing accuracy, and reduces motor current errors, leading to improved performance and efficiency.
Implementation Method 1
The pendulum mass acts in particular as a centrifugal pendulum or absorber pendulum. The pendulum mass is only attached to the stator, with the connection to the stator being designed so softly that the pendulum mass follows the movements of the stator with a certain delay. This behavior has a damping effect
Implementation Method 2
The pendulum mass follows the movements of the stator with a certain delay. This behavior has a damping effect, with the damping effect being ensured over a large frequency range
Implementation Method 3
The pendulum mass is connected to the body via an elastic element, in particular via a web, a spring or an elastomer part. In particular, the web can have a flexure joint
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The device has a rotor (2) rotatably arranged relative to a stator (1) about an axis in circumferential direction. The rotor is provided with a shaft (2.1), at which a code disk (2.2) is torque-proof secured. The stator includes a body (1.3) and a sampling unit (1.2) for sampling the code disk. A set of pendulum masses i.e. centrifugal force pendulum masses, is connected over two bars with the body, where a direction component is movable parallel to the circumferential direction and relative to the body with the pendulum mass.