SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 25357 papers
This paper examines how data from an accidental branched wellbore can be used to determine the attitude of beds in the subthrust zone of the Astashevskaya area, where correlations between separate wells had previously been unreliable. Using repeated penetration of the same rock interval by two boreh…
The paper addresses the determination of deep bedding attitude where only a single oblique section line and two unoriented cores, or two nearby boreholes, are available. It presents a practical graphical and analytical procedure using core measurements, borehole geometry, and stereographic projectio…
This paper examines methodological and technical problems in testing oil and gas wells in Tomsk Oblast, where multilayered reservoirs and difficult log interpretation made conventional cased-hole, bottom-up testing slow and costly. Using operational time data and field experience with formation test…
This paper assesses the oil and gas potential of Upper Cretaceous sediments in the northeastern West Siberian Lowland, focusing on the contrast between major Cenomanian gas accumulations in the north and less favorable marginal areas. It argues that increased sandiness, discontinuous and eroded Turo…
This paper examines the use of gamma activation analysis to determine nitrogen, and also oxygen, in crude oil and oil fractions, where conventional chemical methods are slow and relatively imprecise. The authors irradiated sealed oil samples with high-energy bremsstrahlung from a betatron, monitored…
This paper examines the use of a high-current 25 MeV betatron as a bremsstrahlung source for gamma-activation elemental analysis, with attention to sensitivity limits, interfering neutron-induced activity, and measurement schemes. The authors describe coincidence and scintillation counting arrangeme…
The paper describes the South Myldzhinskoye structural uplift in Western Siberia, emphasizing its unusually steep flank dips compared with typical regional oil-bearing structures. Using seismic structural data, well elevations, and core observations from wells 22 and 24, the authors argue that local…
This paper evaluates prospects for discovering new oil fields in Jurassic deposits of the Lar-Egan oil-bearing region of the West Siberian Lowland, focusing on productive horizons M, Yu2, and especially Yu1. Using drilling, testing, lithological, structural, and geophysical data from local uplifts o…
This paper reports preliminary determinations of carbon isotope composition in oils, condensates, hydrocarbon gases, and kerogen from the West Siberian Lowland, with examples mainly from fields in Tomsk Oblast. Using MI-1305 mass spectrometers, the authors compare C12/C13 ratios across productive ho…
This paper discusses methodological requirements for mass spectrometric determination of carbon isotopic composition in oils, gases, condensates, and related organic materials. It evaluates sample preparation and gas introduction procedures, arguing that combustion products should be converted to ba…
This paper develops a statistical methodology for investigating the load conditions of induction motors in universal metal-cutting machines, where low and highly variable average loading is treated as a random process. Using survey data from 1K62 screw-cutting lathes, the authors model motor shaft p…
This paper examines when two mutually noninductive windings in a combined electrical machine can advantageously be replaced by a single combined winding. It develops design relations for selecting current density and linear loading while preserving power, heating, copper losses, parameters, and char…
The paper examines systematic underloading of induction motors in general-purpose metal-cutting machine tools and its effects on power factor, unused capacity, and motor selection. Drawing on surveys of about 1500 machine tools at 17 plants and comparisons of published load data, it argues that moto…
This paper examines the limitation of surge currents, impact torques, and acceleration during starting and reversing of squirrel-cage induction motors used in metallurgical roller-table drives. Using an MN-14 analog computer model, the authors vary symmetrically connected active resistances in the s…
This paper examines how the total moment of inertia referred to the shaft and the constant reactive load resistance torque affect starting and reversing transients in asynchronous roller-table motors. Using an MN-14 analog computer model based on electromechanical drive equations, the authors vary i…
This paper formulates basic calculation equations for synchronous reluctance reduction gear motors, motivated by the need for stable low-speed drives and by the lack of a unified theory for their design. Using two-reaction theory and rotating magnetic-field representation, it derives voltage, flux l…
This paper examines the use of a synchronous impact generator as an autonomous pulsed power source, especially for relatively low transferred energies and active loads. Using analog computer modeling and a simplified equivalent circuit, it derives conditions for matched load resistance, pulse durati…
This paper reports an experimental study of an autonomous pulsed power source in which a synchronous generator, rectifier, and storage capacitor are supplemented by a resonant inductive-capacitive converter to approximate constant-current capacitor charging. The authors describe measurement methods …
This paper analyzes voltage ripple in brushless DC generators using semiconductor bridge rectifiers, with emphasis on how phase number, commutation angle, generator parameters, and load type affect the alternating component of the rectified output. The authors derive analytical expressions for recti…
This paper examines the reduction of end-winding leakage inductance and electrodynamic forces in shock generators by means of nonmagnetic conducting shields. It formulates the magnetic-field problem using the vector potential in a simplified rectangular geometry, derives expressions for leakage perm…
This paper examines a cascade brushless single-phase synchronous generator intended for increased-frequency autonomous power systems and combining magnetic and electrical circuits. It describes the operating principle in which the rotor winding, connected through a half-wave rectifier, serves both a…
This paper develops a calculation method for the magnetic field in the air gap of a transverse-field electric machine amplifier with a smooth armature and a concentrated compensating winding. Using Grinberg’s method, the air-gap region is divided into rectangular subregions, and Laplace or Poisson e…
The paper examines how to choose the number of turns and slot distribution of the compensating winding in transverse-field electric-machine amplifiers, with particular attention to smooth armatures. It derives design formulas for distributed compensation by comparing the armature reaction magnetomot…
This paper addresses calculation of the magnetic field of rectangular interpoles in DC machines, motivated by the importance of the commutating electromotive force and the difficulty caused by a nonuniform air gap and significant leakage flux. The authors develop an empirical method based on field m…
The paper addresses calculation of the main pole leakage field in the commutation zone of DC machines operating with a saturated magnetic circuit, where conventional unsaturated field methods are insufficient. It proposes combining a flux tube calculation for the neutral zone with Benedikt’s nomogra…
This paper examines design problems for the electric-machine part of a contactless variable-frequency electric-machine amplifier with combined main and auxiliary stages in a single magnetic core. It derives relationships for distributing magnetic induction and linear loading between the stages, anal…
The paper analyzes energy relations in an adjustable-frequency electric-machine amplifier while explicitly accounting for the circuit of a controlled semiconductor commutator. It compares contactless and contact implementations, considering operation of the additional stage in motor and asynchronous…
This paper develops a theoretical model of a variable-frequency electric-machine amplifier that explicitly includes the controlled semiconductor commutator and its interaction with the control winding. Treating the commutator and control winding as an m-phase inverter, the authors derive voltage, cu…
This study examines surface films formed on commutators and slip rings of electrical machines by electrographitized brushes, focusing on their structure, phase composition, and thickness. Films were separated from copper substrates by electrochemical and chemical methods and analyzed using transmiss…
The paper describes the development of a unified series of three-phase asynchronous motors for portable power tools, motivated by growing demand and the need for improved electrical safety through double insulation. Using computer-based optimization, the authors evaluated motor designs for 50 Hz and…
The paper addresses calculation of equivalent circuit parameters for induction motors with inductive reactance inserted in the rotor circuit, where nonlinear frequency-dependent behavior and surface effects in massive steel disks complicate conventional modeling. It develops a practical method based…
This paper addresses errors in conventional experimental methods for determining the direct and quadrature axis reactances of synchronous machines, especially small machines and machines excited by permanent magnets. It proposes determining armature reaction parameters from measured magnetic field d…
The paper describes a brushless synchronous generator intended to improve utilization of earlier machines with combined magnetic and electric circuits, where parallel field windings led to low resistance, high excitation current, and inefficient exciter operation. It presents and tests a design base…
This paper presents a calculation method for the external and regulating characteristics of a self-excited induction generator with capacitor excitation and frequency stabilization by varying the active resistance of the rotor circuit. Using a T-shaped equivalent circuit with constant parameters and…
This paper examines ventilation noise as a distinct component of noise in enclosed fan-cooled asynchronous electric motors, emphasizing vortex noise generated by centrifugal fans, casing inlets, shields, and nearby stationary obstacles. It presents empirical relations for estimating fan noise as a f…
This paper examines mechanical sources of vibration and noise in squirrel-cage induction motors, focusing on imbalance, rolling and plain bearings, bearing fits, structural materials, and mounting accuracy. Drawing on design experience, experimental spectrograms, and prior studies of high-precision,…
The paper examines the steady-state error of a discrete voltage regulation system for a low-power synchronous generator using a relay amplifier and an implicitly defined pulse-width modulator. Instead of replacing the relay characteristic by a vibrationally linearized model, it derives switching con…
This paper discusses a contactless measuring device for limiting generator current in motor and tractor electrical systems using a half-wave rectification circuit. It argues that the DC component of the phase voltage, equal to the voltage drop across the active resistance of the phase winding, can s…
This paper examines the use of a half-wave rectification circuit in homopolar inductor generators for tractor electrical systems, where rectifier cost, reliability, and cooling are important design constraints. It argues that, with a suitable phase-winding arrangement and diode polarity, the working…
This paper develops an approximate graphical and analytical procedure for calculating the specific magnetic permeance between a stator tooth and the rotor of a salient reluctance machine as a function of rotor electrical angle. Building on Pohl’s method, it examines the limitations of using a single…
This paper reviews the development of automatic voltage regulation systems for tractor and automotive generator installations, with attention to electromagnetic excitation, regulator power requirements, and reliability constraints. It compares contact-vibrating, contact-transistor, transistor, and t…
The paper analyzes mechanical friction losses in direct current machines whose rotating parts operate in a liquid dielectric, a condition that substantially increases losses and constrains the choice of armature geometry. It derives formulas for disk, cylindrical, end part, and commutator friction u…
This paper compares overload protection of an AO-51-6 induction motor using conventional AP-50 thermal relays with bimetallic strips and an ATB-229 thermistor-based temperature protection device employing TR-33 negative-temperature-coefficient thermistors. The authors report thermal tests under cont…
This paper examines simplified differential protection schemes for two-winding power transformers using ferromagnetic transducers as the central measuring element. It compares circulating-current and voltage-balance implementations, discusses the use of saturating intermediate transformers to restra…
This paper examines how the ratio of stator to rotor slot numbers affects the uniformity of rotation in asynchronous micromotor rotors, a question previously studied mainly in relation to noise, vibration, and mechanical characteristic dips. Experiments on 30 W motors with 24 stator slots varied sta…
This paper addresses quantitative allowance for transverse armature reaction in DC micromotors using anisotropic permanent magnets, where conventional approaches based on longitudinal demagnetization curves do not adequately describe stabilization under transverse fields. The authors analyze how ani…
This paper analyzes transient and steady-state behavior in a pulse-width discrete control system for regulating the rotational speed of a separately excited DC micromotor under a step change in load torque. Using the discrete Laplace transform, the authors derive closed-system transfer functions, a …
The paper compares star and delta phase connections in three-phase brushless DC micromotors using a bridge semiconductor commutator. Treating the motor as a synchronous machine supplied by an inverter tied to rotor speed, the authors analyze voltage harmonics and the effect of rotor magnetic-field s…
This paper examines a contactless single-section DC micromotor intended for microfan drives, where the fan load permits the use of intermittent rather than continuous electromagnetic torque. It describes a design combining a single-phase motor, rotor position sensor, semiconductor commutator, and pe…
The paper examines electromagnetic factors governing commutation in asynchronous DC motors, whose commutating behavior had not been sufficiently characterized. Using the motor vector diagram, the author derives expressions for the external-field commutating emf and for the angle between stator and r…
