V. N. Antipov

Some problems of the high-speed permanent magnet miniturbogenerators development

Investigations for developing ultimate rating microturbogenerators based on modern materials were executed. Maximum permissible electromechanical and mechanical loads depending on minimum permissible core dimensions for microturbogenerators with rating of 100 and 200 kW and speed of rotation 30000-100000 rpm are determined. Complex simulation models for the purpose of chosen generator parameters optimization and for 3D contact problems decision based on numerical finite element method are worked out. For principal decision of mechanical problems for microturogenerator with rating of 200 kW and speed of rotation 100000 rpm and more, its necessary to use new materials of higher strength. Consequently the most essential physical characteristics of strip cylinder materials which exert influence on the geometric dimension changes limits were find out to raise microturogenerator capacity.

Ceramic nanocomposites based on oxides of transition metals for ionistors

Low-temperature synthesis methods are used to produce nanoceramic materials for electrodes of the following ionistors: (ZrO2)0.6(In2O3)0.4, praseodymium cobaltite, as well as neodymium, lanthanum, and nickel chromites; they operate in the presence of an ion-conducting phosphorosilicate separator membrane and phosphate impregnation. Film electrodes of ionistors are fabricated that consist of nanocrystalline oxide materials deposited as a thin film on a porous electroconductive metal substrate, i.e., foamed nickel. The MnO2-foamed nickel electrode has a specific capacity of 45.0 F g−1, which is compared with that of industrial supercapacitors.

Sol-gel synthesis and the study of the surface of epoxide-siloxane and epoxide-titanate coatings

Three compositions based on epoxide-siloxane, epoxide-titanate, modified epoxide-titanate sols have been synthesized by the sol-gel method, and the morphology of surface and the hydrophobicity of coatings obtained on their basis has been studied. According to the results of the studies, the compositions of the coatings have been chosen for the conduction of tests on a rotor of high-rpm miniturbogenerator, with the aim to determine the effect of aerodynamic losses.

Design considerations of submersible unprotected solid-rotor induction motor

This paper deals with alternative solution of submersible sealed oil-extended motor - submersible unprotected solid-rotor induction motor of 12/18 kW, 750/1500 V, 3000/6000 rpm, which can operate inside oil well, in corrosive medium-strata liquid (mixture of oil, associated water, mineral admixture and oil gas) with ambient temperature 1500degC and pressure 30 MPa. To estimate the performance of the solid rotor motor two-dimensional (2D) nonlinear complex time-harmonic solver is constructed to model the machine in steady-state. Non liner magnetic material characteristics, the different rotor construction were taken into account.

Promising electromechanical energy converters based on new materials and coatings

The efficiency of new materials and the application of coatings for promising high-speed electromechanical energy converters has been estimated. A new basic model of miniturbogenerator intended for testing new materials and coatings has been developed. The experimental results obtained for pilot samples with different organic-silicate coatings show that the losses in the rotor decrease.

Prospective permanent magnet turbogenerator design for local power engineering

This paper deals with the design of the high speed turbogenerator of 6000 kW rating at 12000 rpm for local power engineering having raised technical and economic parameters. Some questions of the optimal construction with mechanical and electromagnetic characteristics are estimated. For principal decision of mechanical problems for turbogenerator its necessary to use new materials of higher strength. Recommendations at the choice of proper rotor materials are given and opportunities of decrease in loss are estimated.

Peculiar design of permanent magnet synchronous motor

This paper deals with peculiar design of high frequency 15 kW synchronous permanent magnet motor having raised technical and economic parameters. Reduction of losses is achieved by slotless stator core structure. Performance motor characteristics are increased by special rotor design: the rotor has two parts which are moving under inner stator diameter and over outer stator diameter, so the both sides of a coil create electromotive force. Some questions of optimal construction with electromagnetic characteristics are estimated. Recommendations at the choice of proper rotor dimensions are given and opportunities of decrease in losses are estimated.

The sol-gel and hydrophobic properties of antifriction coatings for use in high-speed mini-turbogenerators

The state of the surface of organic-inorganic coatings derived by sol-gel technology on a steel surface and their effect on the reduction of the air friction losses of a mini-turbogenerator rotor were studied. Two hypotheses about the effect of the surface condition on the reduction of the air friction losses—by improving the surface smoothness and by creating a superhydrophobic surface—were suggested and tested. Smooth epoxy-titanate coatings including those doped with a fluorine-containing organosilicon polymer and superhydrophobic surfaces based on hydrolyzed methyltriethoxysilane with an aerosol additive were tested on a model mini-turbogenerator test setup. It was established that the smooth coatings reduce the total friction losses of the mini-turbogenertor by ∼5%, while the superhydrophobic coatings reduce them by ∼7%.

Design and analysis of line-starting 3150 kW permanent magnet motor

The starting torque of the line-starting synchronous permanent magnet machines has two components, namely, the driving induction torque and the braking magnet torque. The synchronous PM motor can reach the speed of rotation close by synchronous ones if the asynchronous electromagnetic torque will be greater than the braking electromagnetic torque. The calculations were made for two different design of 3150 kW synchronous PM motor, namely, for complicated configuration with a squirrel-cage and more simple one without cage. Success of the synchronous PM motor starting stage depends only from rotor operation factors.

Design considerations of high-speed permanent magnet machines. Evaluating approach

Design problems of permanent magnet (PM) high-speed machines have some peculiarities. The possibilities of increasing the electromagnetic torque are depended on mechanical, electrical and magnetic aspects. Mechanical aspects of designing for some types of high speed PM electrical machines such as PM synchronous machines with a wide range of rotating speed and power rating are specially discussed in the paper. The analysis technique for machines of such type is developed. Numerical solution results for different ranges of PM machines and testing results for two realized designs are presented and discussed.