Development of a method for analyzing a dc motor high-power with claw poles designed for Pilger mill for the manufacture of seamless pipes

Abstract

The article presents the design method of brushless DC motor with claw-type poles designed for the pilger mill drive for producing seamless tubes. Motors of this class are widely used for drives of small and medium capacity, but in world practice there are no examples of the production of such engines with dimensions up to 10 meters and a power of several megawatts. The article shows the feasibility of using such large and powerful electric motors for drives operating in severe conditions. This is due to the possibility of assembling a magnetic system with high-coercive permanent magnets without additional expensive tooling. But it should be noted that the calculation of the inductor with claw-type poles is quite complex. There are great technical risks to develop an inefficient design with a small magnetic flux. The article proposes to divide the problem into 2 stages. At the first stage, the problem of determining the optimal geometry based on nonlinear programming methods is solved. The authors propose a synthesis program implemented in the Delphi. The program contains several levels of optimization and covers a large number of project situations. At the second stage, the task of analyzing the optimized motor design is implemented. We use a well-tested in practice program Ansys Electronics Desktop. At this stage, the authors are faced with the need to use powerful computer resources and a large time in a few hours to calculate one option. This is due to the fact that the construction with claw-like poles does not have 2d symmetry and it is necessary to solve a 3d field problem. The article proposes an effective method of solving this problem. The authors propose a simplification of the computational model without significantly reducing the accuracy of the calculation. A motor with claw-type poles is replaced by a motor with tangential magnets, which has a 2d symmetry and can be calculated by solving a 2d field problem. The design of the stator and the magnetic fluxes of the motor standard motor and identical twins, respectively, losses, currents and voltages are also equivalent. The effectiveness of such a replacement is shown on a real project. Calculation time at acceptable quality is reduced to several minutes. This approach is recommended for the creation of design systems of other types of machines.

Development of a concept of an energy-efficient house for an environmentally friendly settlement in the South Ural

“…One of the variants for such a project is an environmentally friendly settlement. It is a settlement, which is created for the organization of environmentally friendly space for people's lives, satisfying the requirements of aesthetics, physiological and psychological comfort [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”