Electric Motor Vibration Analysis Using Brake or Acceleration Jolts
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Solution Overview
Problem
Existing methods for determining the vibration behavior of electric motors, particularly fans, require time-consuming run-up or run-down tests to identify resonance points, which are inadequate for dynamic environments due to changes in installation conditions.
Innovation Solution
A method involving a single 'jolt' event, either a brake shock or acceleration shock, is used to excite the electric motor and its installation environment, with vibration detection and spectral analysis to determine vibration behavior without extensive testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If run-up or run-down tests are performed to identify resonance points, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies periodic action by using short, repeated impulse excitations (jolts) instead of continuous run-up or run-down tests. Each impulse triggers a transient vibration response that is analyzed to identify resonance points, allowing rapid repeated measurements without the time-consuming speed ramps of conventional methods
Solution Approach 2:
The patent implements skipping by bypassing the traditional gradual acceleration or deceleration process entirely. Instead of slowly ramping through the speed range to observe vibrations, the method applies instantaneous impulses at various speeds and analyzes the immediate transient response, effectively skipping through the speed range rapidly while still capturing resonance information
2Measurement precision
If run-up or run-down tests are performed to identify resonance points, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The periodic impulse excitation method enables rapid repeated measurements during maintenance intervals, allowing multiple resonance assessments to be performed quickly. This increases productivity by reducing the time required for each maintenance check and enabling more frequent monitoring without significant time investment
Solution Approach 2:
By skipping the time-consuming speed ramping process and using instantaneous impulses, the method dramatically reduces test duration. This time savings directly improves productivity by allowing faster completion of maintenance tasks and reducing equipment downtime during resonance testing
3Reliability
If vibration detection during run-up or run-down is performed, then reliability is improved, but loss of time increases
Solution Approach 1:
The method uses periodic impulse excitations during commissioning to reliably determine vibration behavior and resonance points. Each impulse provides a clear transient response that is easy to analyze, ensuring reliable results while completing the commissioning process much faster than traditional run-up or run-down methods
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
Enables rapid and efficient identification of resonance points and vibration modes, reducing the need for frequent maintenance and improving operational efficiency by avoiding resonance-related issues.
Implementation Method 1
generating a jolt by triggering a braking process or an acceleration process or by changing a braking process or an acceleration process
Implementation Method 2
generating detected vibration values by detecting vibrations of at least a portion of the electric motor using at least one vibration sensor
Implementation Method 3
determining spectral components by means of a frequency analysis of the detected vibration values
Data Source
AI summary
A method is disclosed for determining a vibration behavior of an electric motor, in particular an electric motor of a fan, and/or its installation environment, wherein a rotary motion of a rotor of the electric motor can be braked in a braking process. The disclosed method comprises generating a jolt by triggering a braking process or an acceleration process or by changing a braking process or an acceleration process, generating detected vibration values by detecting vibrations of at least a part of the electric motor by means of at least one vibration sensor, determining spectral components by means of a frequency analysis of the detected vibration values, and determining a vibration behavior of the electric motor and/or its installation environment by evaluating the spectral components. Further disclosed is a corresponding electric motor, fan, and system, each of which may be configured to carry out the method.