Electric Motor Vibration Evaluation Using Integrated Sensor Feedback
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Solution Overview
Problem
Existing methods for evaluating the vibration behavior of electric motors are inadequate, particularly in identifying resonance frequencies and assessing the impact of unbalances, leading to reduced service life due to excessive stress on components and electronics.
Innovation Solution
A method that integrates a vibration sensor within the electric motor to measure acceleration and speed, generating a vibration value that is compared to reference values to evaluate the motor's vibration behavior, allowing for real-time assessment of critical vibration levels and generation of warning messages or protective measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external sensors are used to monitor vibration levels, then vibration monitoring is possible, but the sensors ignore or inadequately consider imbalances in the electric motor, leading to limited statements about vibration behavior
Solution Approach 1:
The patent uses the motor electronics as an intermediary to host the vibration sensor and evaluation logic. The vibration sensor is integrated into the motor electronics, which already processes motor signals. This intermediary position allows the system to access both vibration data and motor operational parameters (speed, torque) simultaneously, enabling comprehensive vibration behavior evaluation that accounts for motor imbalances and operating conditions.
Solution Approach 2:
The motor electronics serve multiple functions: they control the motor operation and simultaneously host the vibration monitoring system. The evaluation logic within the motor electronics processes both motor control signals and vibration sensor data, creating a multi-functional system that eliminates the need for separate external monitoring equipment while providing more comprehensive information.
2Reliability
If vibration monitoring is implemented using external sensors, then vibration levels can be recorded, but no concrete statements can be made about the vibration behavior of the electric motor itself
Solution Approach 1:
The patent merges the vibration monitoring function with the motor control system. The vibration sensor is physically and functionally integrated into the motor electronics, combining what were previously separate functions (motor control and vibration monitoring) into a unified system. This merging enables the evaluation of motor-specific vibration behavior by correlating vibration data with motor operational parameters.
Solution Approach 2:
The system implements feedback by continuously monitoring vibration levels and comparing them against reference values that account for current motor speed and torque. The evaluation logic processes this feedback information and can trigger warnings or protective measures when abnormal vibration behavior is detected, creating a closed-loop monitoring system that provides actionable insights about motor condition.
3Measurement precision
If integrated vibration monitoring is implemented, then comprehensive evaluation of vibration behavior is possible, but the device complexity increases
Solution Approach 1:
The motor electronics serve themselves by hosting the vibration sensor and evaluation logic within their own structure. The system uses its own processing capabilities and existing communication interfaces to perform vibration monitoring and evaluation, eliminating the need for separate external monitoring equipment and reducing overall system complexity despite the enhanced functionality.
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 provides a comprehensive evaluation of the electric motor's vibration behavior, enabling early detection of potential damage, reducing stress on components, and extending the service life by identifying and mitigating excessive vibrations.
Implementation Method 1
measuring an acceleration and/or a speed of vibrations of the electric motor
Implementation Method 2
measuring an acceleration and/or a speed of vibrations of the electric motor
Data Source
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AI summary
The invention relates to a method for evaluating the vibration behavior of an electric motor. The method has the steps of: determining a vibration value of the electric motor (1) by measuring the acceleration and/or speed of vibrations of the electric motor (1) using a vibration sensor (5) of the electric motor (1), wherein vibrations are measured in at least one direction, and the vibration value represents each of the measured at least one direction, determining a current rotational speed (n) of the electric motor, comparing the vibration value with a reference value for the current rotational speed, and determining an evaluation measurement in order to evaluate the vibration behavior of the electric motor on the basis of the comparison of the vibration value with the reference value. The invention additionally relates to a corresponding electric motor (1) and to a system consisting of the electric motor (1) and a testing system (2), by means of which the vibration behavior of the electric motor (1) can be calibrated and reference values can be generated.