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Volokitina Y.V.,Vyatskii State University | Vlasov A.I.,JSC Tekhnodinamika | Opalev Y.G.,JSC Tekhnodinamika | Yurlova O.A.,Vyatskii State University
Russian Electrical Engineering | Year: 2016

This article discusses the causes of cogging torque pulsations in a deenergized brushless dc motor (BLDC) with a tooth stator and magnetoelectricity stimulation. Based on the causes that we identify, we propose a method of reducing cogging torque pulsations in order to improve the rotation speed uniformity of a BLDC. The method is based on optimization of the number of stator slots, which determines the type of stator winding for a given number of poles in magneto-electric machines. For the maximum possible reduction of cogging torque pulsations, it is proposed to bevel the stator slots at an angle divisible by the main tooth harmonic period. All analytical calculations were performed with the use of numerical methods for mathematical modeling of the magnetic field in the magneto-electric machines with the use of Elcut specialized software. Based on the calculation results, recommendations for the design of a BLDC with a minimum level of cogging torque pulsations were elaborated. Our theoretical studies have been checked by experimental investigations of a DBM 142-18-3 motor and applied to the design of the BLDC (DBM series) manufactured by JSC Electroprivod, Kirov. Electric motors of DBM series are used as precision electric drives for metalworking equipment, where a high uniformity of rotation speed is a major requirement. © 2016, Allerton Press, Inc.


Reshetnikov S.M.,Vyatskii State University | Bobrov A.S.,Vyatskii State University | Zyryanov I.A.,Vyatskii State University
Russian Aeronautics | Year: 2010

Thermal and electric structures of diffusion coaxial jet flames determined experimentally are presented. The Burke-Shumann problem is solved taking into account electrostatic forces appearing under imposition of an external electric field on the flame. The excessive concentration of negative charges in the flame plasma with oxidizer deficiency is evaluated. © Allerton Press, Inc., 2010.


Koshurnikova E.V.,Vyatskii State University | Kalinina L.A.,Vyatskii State University | Ushakova Y.N.,Vyatskii State University | Ananchenko B.A.,Vyatskii State University | Bezdenezhnykh L.A.,Vyatskii State University
Russian Journal of Electrochemistry | Year: 2011

The possibility of synthesizing sulfide-conducting solid electrolytes in the CaYb2S4-Y2S3 quasibinary system is tested for the first time. The system is characterized by the X-ray diffraction analysis and the electron microscopy. The total conductivity of specimens is found by the conductometric method. The ionic and electronic transport numbers are determined based on the modified versions of the emf method and the Hebb-Wagner polarization method. The possible mechanism of defect formation is discussed. © 2011 Pleiades Publishing, Ltd.


Ananchenko B.A.,Vyatskii State University | Koshurnikova E.V.,Vyatskii State University | Kalinina L.A.,Vyatskii State University | Ushakova Yu.N.,Vyatskii State University | Bezdenezhnykh L.A.,Vyatskii State University
Glass Physics and Chemistry | Year: 2012

CaYb 2S 4-based phases with a superstoichiometric content of Yb 2S 3 to be used for depositing thin-layer sulfur-containing coatings were obtained for the first time. The attestation of the samples was performed using X-ray diffraction and electron microscopy. The conductometry was used to measure the complex electroconductivities of the samples, whereas the bulk and intergrain components were determined by means of impedance spectroscopy. Based on conductometry and potentiometric chronoamperometry data, the self-diffusion and effective diffusion coefficients were determined. In order to predict the application area, the working range of sulfur partial pressures was determined using the emf method. © 2012 Pleiades Publishing, Ltd.

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