power tools that are used in various industries have power take-off drives for aggregating various machines and mechanisms. In the agro-industrial complex, one of the most common power tools are tractors manufactured by the Minsk Tractor Plant. The drive of power take-off in these tractors is carried out at the expense of the planetary mechanism. The wheel and the solar gear of the planetary mechanism are connected to the drums, alternately stopping the drums is carried out on and off the drive. The brake tape of the firing drum connected to the sun gear is most susceptible to wear, as the drum is loaded with a torque of at least one third of the torque to the drive of the aggregated machine.Due to the design features of the existing control mechanism, the turn–on time is 1.5-2 times less than recommended for devices of this kind. As a result, there is an intense wear of the friction lining of the inclusion drum tape.Regulation of the control mechanism of adjusting screws is carried out untimely, as a result, the durability of the tapes is very low.To improve the durability and efficiency of the power take-off drive, a drive-on design is proposed by electromagnets.Applying force to the tape by electromagnets at four points, instead of one in the previous design, will improve the braking efficiency of the inclusion drum.It is possible to include electromagnets not at the same time, but with some time offset, with a gradual pressing of the tape, starting with the portion of the tape closest to the axis of its suspension. This improves the fit of the tape to the drum inclusion.In the transition from a mechanical drive to an electrical device, the control operation is eliminated, which reduces maintenance time, significantly increases the life of the brake belt and increases the efficiency of the power take-off drive.

The article offers mathematical tools for programming dispatcher tasks on programmable logic matrices, which allow to obtain closed axiomatic models of the dispatcher’s professional activity in the course of the dispatcher’s dialogue with the computer and implement it in the form of optimal combinational logic schemes with pairwise alternative outputs. These tools implement a user-friendly interface for modeling a logically complete consistent system of axioms written in the production language in a tabular form that resembles decision tables with a limited input. The modeling dialog completely frees the dispatcher from the need to know the properties of axiomatic models and requires only professional skills of dispatcher management. Its function in this dialogue is only to specify the desired action in a specific situation that occurs during the object management process. Such situations are constantly formed during the field work in crop production. Sudden failure of power units, two or three-day period of adverse weather increases the risk of violation of agricultural deadlines. This requires prompt decision - making on re-completing units, changing the plan of mechanized work. The search of all possible situations and obtaining on their basis an optimal set of consistent products closing the axiomatic model is provided exclusively by the interface software, which is developed using algorithms for negating and minimizing disjunctive normal forms of logical functions and includes software tools for modeling logically complete consistent decision tables and optimizing them in order to obtain optimal combinational logical devices with their subsequent hardware implementation in the form of microchips. In addition, these software tools are offered as one of the tools for software implementation of branched algorithms with high complexity indicators according to M. V. Arapov in the automated design of control systems for various purposes.

In agriculture, use of solar energy is of crucial importance for water heating and functioning of greenhouses. It becomes even more important in agricultural enterprises which are located far from electric energy transmission lines. Furthermore, in Russia the importance of solar energy for agricultural enterprises can be motivated by deterioration of electric energy transmission lines. The article is devoted to the development of a sun tracking algorithm for solar panels without using GPS or sensors. The tracking algorithm has been created on the basis of well-known astronomic methods for calculation of the Sun’s position in azimuth coordinates. The control diagram using the Arduino platform is presented. The authors’ program works for the calculation of the Sun’s position complete with evaluation of error. It also works well with servo drive units. The hardware and software bundle have shown acceptable error values which did not exceed 2 % while aligning the panels with the sun.

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