Problems of development of traction drives with brushless traction motors for passenger electric locomotives

The paper considers a problem of creation of new traction drives with brushless electric traction motors (ETM) for passenger locomotives. Analysis of drive designs revealed that the increase of power of induction motors through the increase of rotation frequency leads to the contradiction between requirements for the design reliability, on the one hand, and requirements for technological simplicity, on the other hand. In order to solve the contradiction it is necessary to use ETM designs that have enhanced torque and minimal dimensions in axial direction. It is established that ETM with disk rotor (axial magnetic flux) satisfy such requirements. The authors proposed an aggregate scheme of support-frame traction drives that include ETM with disk rotor, which allows significantly increasing the adaptability to manufacture and repairability of drive at preservation of reliability. As a result, the authors made a conclusion about the reasonability of conducting research and development work on creation of locomotive ETM with axial magnetic flux. The authors have submitted an application for a patent on the proposed design of traction drive.

The schemes analysis of profile milling of long and non-technological workpieces

The article considers alternative schemes of profile milling of long non-technological workpieces – of the peripheral segments, formed during longitudinal opening of logs. Peripheral segments are a large waste of manufacture and contain the wood fibres with high physics-mechanical and operational properties. Therefore manufacturing qualitative wood products from peripheral segments is especially actual problem. However, the named workpieces are characterised by low adaptability to manufacture, therefore working out and the analysis of the machining schemes, expelling a resonance in technological system are necessary. The non-resonance machining scheme is used in a design of the milling machine tool PFP-100 for profile milling of a large wood waste.

Solutions in Limit Deviations for Optimum Dimensional Structures of Technological Processes of Machining

In the paper the analysis of the dimensional structure of different manufacturing process is made. There are shown that the different schemes of the designer sizes result in a different level of an optimality of a dimensional structure. At definition of number of the technological sizes as criterium of a optimality it is necessary to allow both formation of the intermediate sizes and the effect of errors compensation. The effect of errors compensation is the reason for the change of the sizes nominals and its limit deviations. The detail subjected to machining, is characterized by constructive dimensional links which reflect, eventually, its functionality. The character of the constructive dimensional links is defined by the designer who takes into account the technological features of machine tools, but not in detriment of functionality. Therefore, carrying out of the dimensional analysis on a joint of these two phases is very important with the purpose of improvement of dimensional adaptability to manufacture of made details. One of criterions of this optimality has the structural nature. The manufacturing process is considered optimum, if in the structure of all technological dimensional chaines number of the technological sizes is minimum. This condition executes if to each designer size there corresponds in a technological dimensional chain the unique technological size, and in dimensional circuits for machining allowances, each machining allowance is determined by two technological sizes or one technological size and one size on blank. For different variants of the linear dimensions are shown the way in which are changing the limit deviations of technological sizes and respectively of the constructive sizes of the equivalent details.

Experimental Refinement of Technologies for Environmental Update of Gas Turbine Units Applied to Electrogenerator Driving

The results of experimental elaboration of engineering approaches relating to environmental update of combustors for the GTK-10 10 MW, GTG-1500 1.5 MW and GT-100 100 MW gas turbine engines are presented. The combustor update was carried out by a technique of directed dosed air blow into the maximum temperature zone with in the fire space. The advantages of the technique are as follows: • feasibility of reduction of Nox concentration in waste gases to 50 ppm; • simplicity and adaptability to manufacture of the structure; • no need in changing the design of the engine components and systems; • short-time outage of the unit at update.