Case Studies and Stories
Electric Machine Rotor Bar: Real or False Positive? A Case Study
Vibration, electrical and current signature analysis are technologies that can provide a great deal of information on the condition of our electric machines. In this case study an 1800 RPM, 715 RPM, 4000-volt vertical electric motor originally was operated across-the-line as shown in Figure 1...
- Howard Penrose
- MotorDoc LLC
Motor Oil Usage in a Heavy-Duty Compressor Instead of Compressor Oil: A Case Study
Generally speaking, compressors are divided into two categories: positive displacement and dynamic compressors. In the first type (which is under consideration in this article), gas (in this case: air) is sucked into a completely closed and sealed chamber (e.g., a cylinder) and is compressed by a piston and exits to a sealed circuit.
- Ahmadreza Aminian
- Arya Sepehr Keyhan
Success Case: Preventing Critical Failure in a Paper Machine Guide Roll
Since January 14th, we increased the frequency of measurements on a guide roll bearing in a paper machine due to rising acceleration levels. We did not have online monitoring, so our condition-based approach was crucial in detecting early signs of failure. The roll was in a challenging location, hidden behind the frame, making maintenance complex. Replacing the roll also meant changing the wire, which was not yet at the end of its campaign.
- Felipe Shishito
- Abecom
Vibration Analysis Report of Chilled Water Pump
Due to unexpectedly high vibration levels in a newly commissioned chilled water pump located at Tampines Mall, Alstern Technologies Singapore Pte Ltd engaged SPM to conduct a comprehensive vibration analysis. This analysis involved on-site testing, including run-up and coast-down tests.
- Aung Zay Yar Min
- SPM Instrument
Electrical and Current Signature Analysis of Electric Motors and Driven Equipment
The paper identifies the approach for electrical and mechanical conditions through direct and belt coupled applications and how driven equipment, and loads are evaluated through those coupling types. We will focus on two types of technologies including a 3-phase voltage and current ESA and a single-phase CSA system. The focus will be on CSA but will distinguish what the addition of voltage as part of the measurement will provide.
- Howard Penrose
- MotorDoc LLC
Vibration Spectrum Analysis on Chiller Unit
A call for vibration survey was performed to identify vibratory force that has within the chiller motor and compressor at different vibration location on system.
- Aung Zay Yar Min
- SPM Instrument
Evaluating a Fan and VFD System with Motor Current Signature Analysis
Both Electrical and Current Signature Analysis (ESA/MCSA) can be used to evaluate conditions of a system and assist in preemptively mitigating defects while optimizing system efficiency based on their specific functions. In the case of this article we will focus on a simple single-phase MCSA tester and a fan system with a variable frequency drive that had a synchronous belt installed...
- Howard Penrose
- MotorDoc LLC
Maintaining Power Plants With Ultrasound – A Success Story
In the biomass power plant of Danpower Energie Service GmbH in Delitzsch, Germany, SONOTEC's ultrasonic testing technology was used to successfully detect various types of leaks.
- Christian Probst
- SONOTEC GmbH
Hamestring Pump Station- Identifying Root Cause
In late 2023, Jacobs implemented an annual Artesis Motor Circuit Analysis PDM for the 7 - 350 HP Pumps at our Hamestring Pump Station in Fayetteville. Three of these are VFD driven...
- Tumay Karaver
- Artesis Technology Systems