Abstract
The article presents the method of synthesis and analysis of the brushless motor with claw-poles. The motor is designed for the pilger mill drive for manufacturing seamless tubes. The peculiarity of the drive is that electric machines of this class for high power have not yet been used in world practice. In this regard, a very thorough analysis of the designed motor is required to remove technical risks in the manufacture of prototypes. For design of this motor the synthesis system and the analysis system were developed. The synthesis system is developed on the basis of nonlinear programming methods. For the analysis, it is proposed to use the program Ansys Electronics Desktop, which implements the finite element method. The peculiarity of using this program is the need to use large computer resources. Herewith, the calculation time of the main characteristics is often not acceptable for practical calculations and takes several hours. The authors propose a simplification of the computational model without significantly reducing the accuracy of the calculation. The brushless motor with claw-poles is replaced by a brushless motor with tangential magnets. The stator designs and the magnetic fluxes of the motors are the same. The effectiveness of such a replacement is shown in the real project. Calculation time with acceptable quality is reduced to a few minutes. This approach is recommended for the creation of design systems of other types of brushless machines. This scientific research was carried out for a real customer.
Highlights
Production of reliable large diameter pipes is an important task for enterprises that supply oil and gas complex
Powerful machines with large dimensions and permanent magnets are not widely used in the world. This is due to the complex technology of stator and rotor assembly
Complex equipment is required to compensate for the large one-way magnetic attraction of the stator and rotor during assembly
Summary
Production of reliable large diameter pipes is an important task for enterprises that supply oil and gas complex. One of the variants for this solution can be the production of seamless pipes using pilgrim mill technology. There are about 100 such manufacturers in the world. A pilgrim mill drive for producing seamless tubes runs in Chelyabinsk Pipe Rolling Plant (Russia) with 1928. As a drive motor for the mill, collector DC motor GM 900/100 company Siemens is used with the following main parameters: rated output power 2.75 MW, rated voltage 6 kV DC, rated speed. The motor rotates a flywheel with a diameter of 9 m with a large inertial mass of 120 tons
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