Collaborations

The team has collaborated during many years with the Electrical Energy Conversion Systems Laboratory of Korea University (South Korea) led by Professor Sang Bin Lee. Among the joint collaboration lines, we can find:

- Investigation on the application of starting current analysis to avoid false indications caused by MCSA: presence of rotor cooling ducts, outer cage breakages in double cage rotors, rotor magnetic anisotropy issues, vibrations at blade pass frequencies in pump applications….

- Development of new methods to detect damper failures in synchronous motors.

- Development of techniques based on stray flux.

Several of the contributions derived from this collaboration have been recognized with prestigious awards: 2^nd Prize paper Award or the EMTC of IEEE IAS (2014), SDEMPED Paper Award (2011) and SDEMPED Paper Award (2019).

Group website: http://home.eecs.korea.ac.kr/

The team has also established a fruitful and powerful collaboration with the group HSP Digital from Universidad Autonoma de Querétaro (México) and, more specifically, with the team headed by Professor Roque A. Osornio Rios. The collaboration is mainly focused on the following lines:

- Development of advanced techniques based on the analysis of the stray flux under transient conditions.

- Application of stray-flux transient based methods to the detection of different types of failures and in different machines (wound rotor induction motors, cage induction motors).

- Implementation of collaborative systems in smart sensors.

- Application of stray-flux based techniques to fault detection in CNC machines.

- Application of infrared -based techniques to condition monitoring of induction motors.

As a result of this collaboration, a number of publications has been obtained (both in journals and Conferences), joint SS have been organized and a bilateral PhD thesis is co-supervised between both groups.

The Team has maintained a strong collaboration with Dr. Konstantinos Gyftakis. He was formerly working for University of Oxford and for Coventry University and currently he is lecturer at University of Edinburgh (U.K.).

The joint works with Dr. Gyftakis’ group have been focused on different lines dealing with fault diagnosis on electrical machines, that include:

- Development of new techniques relying on the analysis of the zero-sequence current (zsc).

- Development of advanced method based on the Park’s Vector Approach.

- Investigation on new techniques based on stray flux analysis.

- Optimization of techniques based on transient analysis.

As a result of this collaboration, many outputs have been obtained, namely: journal and conference publications, organization of joint SS, seminars taught in the respective groups...

Since 2015, the group has maintained a continuous collaboration with Laboratoire Ampere of Université Claude Bernard Lyon 1 (France). The counterpart in this collaboration was Professor Hubert Razik from that group. The fruitful collaboration has led to many results in the following research lines:

- Development of techniques for the detection of bearing currents in induction motors.

- Application of current analysis techniques to soft-started and inverter-fed motors.

- Development of reliable flux sensors and implementation of stray-flux based methods.

As a result of this collaboration, many outputs have been obtained, namely: journal and conference publications, organization of joint SS, seminars taught in the respective groups...

Website: https://www.ec-lyon.fr/en/research/laboratories/ampere

The group is maintaining a strong collaboration with the Department of Electrical Machines of the Universidad Politecnica de Madrid (UPM) and, more specifically, with the team leaded by Professor Carlos Platero Gaona. Both groups participate in joint projects funded by the Spanish Ministry and the current research lines are focused on:

- Development and validation of stray-flux techniques adapted to transient regimes and application to induction motors and synchronous motors.

- Optimization of stray flux sensors.

- Fault detection in large synchronous motors and generators.

The group has established a new collaboration with the group headed by Professor Athanassios Karlis of Department of Electrical and Computer Engineering at Democritus University of Thrace (Greece).

This collaboration is focused on the development of new techniques for the determination of the insulation condition in electric motors. These techniques include both new offline methods and online techniques that enhance the performance of the currently available methods for the determination of the insulation health.

A joint Ph.D. thesis is being co-supervised between both groups and joint publications have been

The group has collaborated during many years with the prestigious Electrical Machines & Drives Laboratory at Michigan State Laboratory (USA) headed by Professor Elias G. Strangas.

The fruitful collaboration has been based on the development of algorithms for the automatic fault detection in induction motors relying in the patterns raising after application of transient current analysis.

As a result of this collaboration, several joint publications (both in journals and conferences) have been obtained. Also, mutual research visits and student interchange have been carried out in the respective groups. Members of both teams have participated in joint projects.

Group website: https://www.egr.msu.edu/emdl/

During more than 15 years, the team leader has established a strong collaboration with the group headed by Professor Antero Arkkio (currently retired) at Aalto University (Finland) (formerly, Helsinki University of Technology). This collaboration yielded many results in the electric motor fault diagnosis area and, more specifically, in the optimization and extension of current analysis techniques. Amongst the common research lines, we can find:

- Application of transient current analysis for eccentricity detection.

- Extension of transient current analysis to the detection of combined faults.

- Study and application of different time-frequency tools: Hilbert-Huang transforms, Wigner-Ville Distributions.

- Study of rotor fault propagation mechanism.

As a result of this investigation, many joint publications in journals and conferences were obtained. Also, mutual research visits were carried out (Professor Arkkio visited our team during two months in 2017 while the team leader visited Helsinki during several months in 2005 and 2007).

The group collaborated during many years with the group of the great Professor Jan Rusek (rest in peace) at AGH University Science and Technology (Poland). The fruitful collaboration yielded very good results regarding comparison between wavelet-based methods and filtering techniques for fault diagnosis purposes. Prof. Rusek was one of the pioneers in the analysis of transient regimes and his works were always of tremendous interest for the researchers of the area.

Today, the team has started a new collaboration with Professor Adam Glowacz from the same University in the research area of fault diagnosis techniques based on sound analysis.

The Team has established a recent collaboration with the University of Applied Sciences Kaiserslautern, Germany (group headed by Prof. Sven Urschel). The investigation focuses on the application of current-based diagnosis techniques (MCSA and ATCSA) to fault detection in wet rotor pumps. The detected faults include both faults in the rotor and in the impeller. The results hitherto obtained are very promising and prove the suitability of the techniques for the reliable condition monitoring of these machines.

A Ph. D. thesis is being supervised in the context of this collaboration.