Abstract
A theoretical and experimental study of the effect of gravity, which occurs in a cylindrical linear synchronous motor between the secondary element and the inductor, was carried out. As a result, the forces of mechanical friction of the secondary element on the inductor are formed, which entails touching the secondary element on the surface of the inductor. An unfavourable result is a weakening of the power force that is working for a cylindrical linear synchronous motor. Two different inductor designs for a cylindrical linear synchronous motor have been studied. When solving this problem, we used an approach based on a combination of the field theory method and the theory of electric circuits. The forces of gravity, friction, and force between the secondary element and the inductor for these structures are determined. Experimentally, it was found that the pull force significantly weakens the working force of the engine. Based on the results obtained, conclusions were drawn about the need to change the design of the inductor. The design change of this element consists in the use of a non-magnetic intermediate centralizer, which is inserted between two sliding bearings located at the ends of each module of a cylindrical linear synchronous motor. Also, changes were made to the design of the magnetic circuit, in which instead of one slot for a three-phase winding system, three symmetrical slots were made, each for its own phase of the three-phase winding. As a result, the magnetic system of the engine in question became axisymmetric. The measures taken to change the design of the engine in question allowed us to dramatically reduce the effect of gravity. As a result, the specific force has increased significantly.
Highlights
An electric drive is an indispensable part of any mechanism
As a result of magnetic calculations, we obtained the value of the tension force along the y axis, and found that it must be taken into account to determine the friction forces, since it is significant in magnitude
Calculations have shown that the value of the tension force is almost equal to 4.7 kN, from which it is possible to determine the value of the friction force of the secondary element on the inductor
Summary
An electric drive is an indispensable part of any mechanism. Without it, it is impossible to operate machines, household appliances, medical equipment, and various water and gas supply devices. One of the most modern and highly efficient electric motors is a cylindrical linear synchronous (valve) motor (CLVM) [4,5,6,7,8] Such devices are currently used in many industries: machine tools, transport, robotics, control and protection systems, etc. Тhe introduction of this type of drive, which uses reciprocating motion, will save about 30 % of electricity [9]. High-performance, rare-earth magnets are located on the secondary element of the CLVD, which structurally correspond to valve motors This type of machine has better parameters (higher power density and better dynamic characteristics) than a linear asynchronous motor [10, 11]
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