Bipolar DC grids are gaining great attention in modern power systems due to their superiority over Unipolar DC grids and AC grids. Existing studies on DC microgrid operations and controls individually investigate voltage control and balancing, power-sharing, and fault-tolerant operation. However, simultaneous investigation of voltage control, balancing, fault-tolerant operation and maximizing intermittence renewable energy in bipolar dc grids is important to understand the overall system behaviour. This paper presents a grid-connected bipolar DC microgrid architecture and control strategies to maximize the intermittence renewable energy usage, and reliable operation under fault conditions. The proposed DC microgrid can ensure reliable operation under healthy and faults conditions while utilising a high percentage of renewable energy, being verified through numerical results.

This paper presents the calculation of the AC loss factor of a hairpin winding configuration using an analytical approach. For this purpose, the layer conductor model is developed to evaluate the AC loss factor. Moreover, the numerical model was created, and the collected numerical data was used to successfully validate the proposed analytical method.

This paper presents a comprehensive analysis of bearing fault impact on the vibration of brushless DC motors. This type motors are gaining heightened popularity because of their compact size, low cost, high torque, better control, and easy maintenance. They are becoming increasingly popular in low power applications such as electric scooters and robots. Among others, the bearing related faults are very common in these machines. This is because of the nature of their applications and working environment. In this paper, the effect of different bearing faults on the vibration spectrum is investigated, which can be used as a potential fault indicator. The vibration signals with different faulty bearings are measured in a laboratory setup and the spectrum analysis is done using Fourier analysis.

The paper describes the interaction between Tallinn University of Technology (TalTech, Tallinn, Estonia) and ITMO University (St. Petersburg, Russia) based on recently signed agreement. The purpose of the agreement is to record the intention of TalTech and ITMO University to cooperate on implementing a double master’s degree program, which involves confirmation of the master’s educational level absorption and the award of master’s degree and obtention of two diplomas, and to outline the organizational form, principles and terms of the implementation. The double degree Program is a two-year Master’s program of 120 ECTS credit points. Its structure and content meets the requirements that both TalTech and ITMO University have established for their master’s programs, in accordance with the government standards. Development and approval of the double degree Program is held by the Parties in accordance with the procedures established by them. This paper describes the procedure of implementation of a double-degree master program in mechatronics engineering.

This paper provides an overview of different types of modern thermal analysis methods for TEFC electrical machine with a particular focus on SynRMs. The objective is to provide the reader with a picture of the state of the art regarding different thermal models with their advantages and drawbacks. It describes the challenges and provides the solutions to dominate them during thermal modeling of a TEFC electrical machine.