Electromechanical secateurs based on linear electric motor and determination of cutting force of branches of fruit trees

20th International Scientific Conference Engineering for Rural Development Proceedings

2021

Self Cite

In modern gardening, there are many technological processes that use hand tools. These processes account for about 40% of the labor costs in the process of gardening. In this regard, the cost of horticultural products increases, which affects their competitiveness in the market economy. The use of an electrified or mechanized tool will improve the production efficiency and reduce the cost of horticultural products. Currently, hydraulic and pneumatic drives are widely used. However, these drives have many disadvantages that lead to a decrease in the efficiency of the installations. Therefore, the electric drive is increasingly used. The existing electrified tool uses a DC motor as an electric drive. The most unreliable element of the motor is the brush mechanism. The use of a linear electric motor for the drive of the tool will increase its operational reliability and energy efficiency. This is possible due to the advantages of the linear electric drive, such as simplification of the mechanical part, increased speed and positioning accuracy of the electric motor armature. The proposed electric drive is characterized by low noise level and ease of maintenance. This stage in the development of a linear electric drive is characterized by a small range of tasks to be solved. The proposed design of a linear electric motor will allow, in general, to consolidate the possibility of its use in agricultural production, and in particular for a handheld electrified tool for caring for a garden. Modern design of electrical devices should use existing software systems for modeling magnetic systems. This will make it possible to more effectively solve the problem of increasing the efficiency of the magnetic system of the electric motor. To study the magnetic system of a linear electric motor, we use the ElCut program. The aim of the study is to optimize the magnetic system of the linear electric motor of a hand-held electrified tool. This will increase the force generated by the magnetic field acting on the armature. As a result of the research, the maximum value of the electromagnetic force reaches 53.7 N. In the further design of the power tool, it is necessary to correctly select the kinematic diagram for its effective operation.

Section: Methodsmentioning

confidence: 99%

Section: Fig 3 Linear Electric Motormentioning

confidence: 99%

Study of linear electric motor magnetic system of hand-held electrified tool

20th International Scientific Conference Engineering for Rural Development Proceedings

2021

Self Cite

“…In order to increase the efficiency of harvesting in such farms, development and creation of fundamentally new devices is necessary [4][5][6][7]. These devices must have high energy efficiency, low weight and a high degree of mobile use.…”

Section: Fig 1 Shaking and Cleaning Machine "Maja Automatic Lk"mentioning

confidence: 99%

Fruit picking tool based on linear motor

19th International Scientific Conference Engineering for Rural Development Proceedings

Nikitenko

2020

For the rapid development of gardening, it is necessary to create a set of devices for gardening and harvesting. Harvesting accounts for 15 to 40 % of all garden maintenance work. The use of fruit harvesting machines allows to increase labor productivity during harvesting from 3 to 10 times. Today, there are many designs for harvesting machines in gardens. The industry produces such machines as: MAJA, SP-5, Lisicki, Victor, and many others. All these fruit harvesting machines use vibratory mechanisms. Their disadvantage is: damage to the bark and violation of the root system of the tree. In this regard, there is a problem associated with improvement of the tools for collecting fruits. The intensification of gardening is not possible without increasing the density of planting trees. The distances between the rows of trees are reduced, the existing fruit harvesting machines cannot work effectively under the prevailing conditions. Access to different areas of fruiting is difficult. Using a hand-held electrified fruit picker will be most effective in this case. In addition, a manual device for collecting fruits allows you to eat fruits with minimal damage to the bark and root system of the tree. The main element of the fruit picking device is a linear electric motor. This linear electric motor creates the vibration motion necessary to pick up the fruit. Compared to other types of drive, a linear electric motor has several advantages. The main advantages are low overall dimensions and adjustment of operating parameters.

“…However, for a hand tool, this indicator in some cases can be two times lower than for an electric motor of rotary motion. At the same time, the most important advantage of using a linear electric motor is the absence of a gearbox and motion converter, which reduce reliability and increase vibration and noise [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Optimization of pruner linear motor magnetic system

20th International Scientific Conference Engineering for Rural Development Proceedings

2021

Self Cite

Gardening is one of the most promising branches of agriculture. Intensive planting of new orchards requires rapid development of technologies and tools to support the harvesting process. The formation of the garden's harvest largely depends on modern and high-quality pruning of tree branches. An analysis of the tool base for garden care showed that 80% of horticultural enterprises use hand tools. Pneumatic and hydraulic tools are used by 15% of enterprises. Only 5% of households use electric pruning shears when pruning trees. These secateurs are manufactured by Electrocoup, Bosch, and Makita. The domestic instrument is represented by the developments of the 80s and 90s of the last century. Therefore, there is a need to develop modern pruning shears based on a linear electric motor. Their advantages are high reliability, low noise level and low power consumption. This is especially important since tree pruning takes place over large areas and the presence of large energy sources reduces the pruner's mobility. The linear electric drive is not used in existing pruning shears. This is due to the lack of a theory of designing magnetic systems for hand-held electrified tools. Chain methods for calculating magnetic systems have a high error, which does not allow determining the optimal design at the stage of calculations. This is primarily due to the redistribution of the magnetic flux from the stator through the air gap to the motor armature. The use of modern computer programs (ElCut), using the finite element method for calculations, will allow at the design stage to obtain the optimal design of the magnetic system with a given accuracy. Modeling and optimization of the magnetic system of the electric motor will reveal the most effective direction for the development of pruning shears for pruning trees based on a linear electric motor. The aim of the study is to optimize the magnetic system of the linear electric motor of the pruner. The optimal design of the magnetic system allows increasing the armature pulling force up to 84.35 N.