The formation of energy-efficient control of a high-speed AC electric drive
In this paper the method of synthesis, that provided formation of cost-effective control of high-speed AC electric drive. Presented quality assessments allow you to associate the basic properties of electrical machine with control law.
Effective Work of a Synchron Machine with Different Magnetic Conductivity on Permanent Magnets Excitation
the relevance of the work is due to the desire to effectively control a synchronous machine with different magnetic conductivity along the d and q axes. The well-known solution for controlling the current along the transverse axis is characterized by a significant increase in reactive power with an increase in load and speed, which determines the increase in losses in steel, limits the maximum speed and does not provide a minimum of heat losses in the electric drive. The engine operation modes considered allow increasing the electromagnetic moment and rotation speed, ensuring the efficient use of the electric machine and the power supply of the electric drive under conditions of current and voltage limitation. The limiting characteristics of a synchronous machine by excitation from permanent magnets while limiting voltage and current are considered. The dependence of the position of the current vector relative to the flux of permanent magnets on its module is determined, delivering a maximum of the electromagnetic moment in an explicit pole synchronous machine. The energy efficiency of the proposed control methods is compared with the control of current along the transverse axis. The considered control solutions can be used in an electric drive of transport, where in the conditions of limiting voltage and current it is important to transfer large power to the executive mechanism due to the efficient use of an electric machinealready defines the components of your paper
PASSIVE AND LOW-ENERGY RESEARCH AND PRACTICES-DEHUMIDIFICATION
Methods of achieving acceptable indoor conditions in overheated, temperate, and underheated humid climates are discussed and compared. Desiccants and desiccant systems utilizing solid and liquid sorbents and various low-energy mechanical systems are described and evaluated.