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
Accurate measurements of output characteristics and detonations of motorbike high-speed racing engine and their optimization at actual atmospheric conditions and combusted mixture composition
Abstract At a motorbike high speed racing engine there is very important an output engine characteristics which depends significantly on a detonation combustion rate, atmospheric conditions and a combusted mixture composition. The combustion process has got a relevant influence on a wear degree of main engine parts or on their damage eventually. The detonation combustion rate is very important because this kind of burning can be not only destructive but a useful phenomenon, as well. If the process of detonation burning is kept on a certain level, it can help significantly to the next increasing of an engine power output. In this article there is described the measurements of output characteristics of a high-speed racing engine which were performed by means of a data-recording system and the detonation combustion was evaluated using a quantitative method. The actual values of atmospheric conditions and the mixture composition were added to the measured values. Then the obtained values are compared visually with a damage degree of an engine piston caused by the detonation burning. The result is a limit value expressed in a number of detonation units related to a run distance interval of the vehicle driven by the high-speed racing engine. In framework of this run distance interval there is the process of detonation burning profitable. As well as it increases an engine power output and together it is not destructive with regard to engine design parts.