Integrated Battery Chargers

Integrated battery chargers (IBCs) have been proposed as a low-weight, low-volume, and high-power solution to conventional conductive chargers. However, the design of such chargers is complicated, requiring special components or control techniques to solve inherent issues (such as galvanic isolation, torque generation, and system reconfiguration) associated with their design. Solutions vary based on charging power, drive topology, and motor technology. This chapter introduces designs for IBCs, including solutions as proposed in the literature. It also presents challenges in their industrial adoption. Finally, the chapter presents opportunities for fleet charging applications using IBCs.

Comparative Study of Energy Consumption and CO2 Emissions of Variable-Speed Electric Drives with Induction and Synchronous Reluctance Motors in Pump Units

This study carried out a comparative analysis of indicators of electricity consumption and CO2 emissions for four-pole induction motors (IMs) of efficiency classes IE3 and IE4 with a rated power of 2.2–200 kW in a variable speed pump unit. In addition, innovative IE4 converter-fed synchronous reluctance motors (SynRMs) were evaluated. The comparison was derived from the manufacturer’s specifications for the power drive systems (PDSs) at various rotational speeds and loads. The results showed that the emission indicators for IE3 class motors were significantly worse compared with IE4 class motors for low power ratings, which make up the vast majority of electric motors in service. This justifies expanding the mandatory power range for IE4 motors to at least 7.5–200 kW or even 0.75–200 kW, as it will dramatically contribute to the achievement of the new ambitious goals for reducing greenhouse gas emissions. In addition, the operational advantages of IE4 SynRMs over IE4 IMs were demonstrated, such as their simpler design and manufacturing technology at a price comparable to that of IE3 IMs.

Study and Assessment of Propulsion Systems of Three-Wheeled Electric Powered Rickshaw in India

India is one of the prominent manufacturers in the automobile industry with 30 Million of vehicles production rate. Most of vehicles manufactured in India utilize internal combustion power drive methodology. Additionally, pollutions, global warming, conventional fuels exhaustion and loss of building materials are the major concerns associated with IC engine technology. Electric drive technology has the potential to mitigate these issues. Three-wheeled (3-W) battery powered rickshaws/vehicles are primarily employed for public conveyance in the metropolitan cities of India. The motor (propulsion) is a vital component of 3-W battery powered rickshaw. But, selection of appropriate propulsion system for 3-W rickshaw is crucial step. In the present study, an exertion has been prepared to assess the correct propulsion system for 3-W battery powered vehicle in Indian contest.

DEVELOPMENT OF A HEAT-DRIVEN DEVICE FOR MOLDING LARGE-SIZED CONCRETE PRODUCTS

Устройство с тепловым энергоприводом для прессования является разновидностью импульсных устройств. Оно позволяет значительно снизить себестоимость прессуемых железобетонных изделий. Для обеспечения высокой мощности устройства для прессования и уменьшения его габаритных размеров и металлоемкости в его конструкции используется тепловой энергопривод внутреннего сгорания. Существующие прессы для прессования бетонных изделий большой мощности конструктивно сложны и дороги. Поэтому прессование применяют в основном при формовании штучных бетонных изделий небольшого размера. Разработан новый вид устройства для прессования крупногабаритных бетонных изделий. Для выполнения этой цели сделано устройство с тепловым энергоприводом для прессования крупногабаритных бетонных изделий, обеспечивающее высокую прочность этих изделий. Разработанное устройство имеет высокую производительность. Получены зависимости для определения энергосиловых параметров данного устройства, а также необходимой величины давления топливной смеси, обеспечивающей осуществление процесса прессования. В частности, для прессования бетонной плиты площадью 1мвполне достаточно давления топливной смеси 0,9 МПа. При этом давление и усилие прессования составляют: P = 11,7 МПа При увеличении давления топливной смеси до 2 МПа усилие прессования достигает 20 МН, что вполне достаточно для прессования крупногабаритных бетонных изделий A device with a thermal power drive for pressing is a type of impulse devices. It allows one to significantly reduce the cost of compacted reinforced concrete products. To ensure high power of the device for pressing and to reduce its overall dimensions and metal consumption, a thermal energy drive of internal combustion is used in its design. Existing presses for molding concrete products of high power are structurally complex and expensive. Therefore, pressing is used mainly in the formation of small-sized concrete pieces. This article is devoted to the development of a new type of device for pressing large-sized concrete products. To achieve this goal, we developed a device with a thermal power drive for pressing large-sized concrete products, which ensures the high strength of these products. The developed device has a high performance. We obtained dependences for determining the power parameters of the device, as well as the required pressure of the fuel mixture, which ensures the implementation of the pressing process. In particular, for pressing a concrete slab with an area of 1 m, a fuel mixture pressure of 0.9 MPa is sufficient. In this case, the pressure and the pressing force are: P = 11,7 МРа , With an increase in the pressure of the fuel mixture to 2 MPa, the pressing force reaches 20 MN, which is quite enough for pressing large-sized concrete products