Abstract
The paper presents the results of research on the performance of linear electro-hydraulic servomechanisms with stepper motor, evaluated by mathematical modelling and numerical simulation with the AMESIM software package. These servomechanisms have a great potential for application, including for agricultural technical equipment. Servomechanisms of various types are used for the rapid and high precision operation of the various systems. In practice, electro-hydraulic servomechanisms have been required in the case of the systems requiring high forces or moments. These equipment are automatic hydraulic tracking systems and can be analysed with methods specific to automatic systems. The paper contains a structural description of an electro-mechanical servomechanism with stepper motor, its operation, mathematical model and its performances obtained by numerical simulation. The mathematical modelling of the electro-hydraulic servomechanism is based on the relations between the input sizes and output sizes of the equipment in its structure as well as the connection relations between these equipment. Based on the obtained results it is demonstrated that the analysis and synthesis of electro-hydraulic servomechanisms with stepper motor can be determined by numerical simulation using the AMESIM simulation software.
Highlights
A linear electrohydraulic servomechanism is an automatic tracking system that achieves the transformation of the input size of electrical nature into a linear displacement, developing simultaneously a high output force
The electrohydraulic servomechanisms with stepper motor do not have in their structure a displacement transducer for achieving the reaction link, their reaction size is of mechanical nature, and it is realized by means of a screw-nut mechanism
The analysis and the synthesis of electro-hydraulic servomechanisms with stepper motor can be determined by mathematical modelling and numerical simulation using the AMESIM simulation program
Summary
A linear electrohydraulic servomechanism is an automatic tracking system that achieves the transformation of the input size of electrical nature into a linear displacement (output size), developing simultaneously a high output force. The electromechanical converter is an equipment that has as an input signal an electrical size, and at its output it has a displacement or a force that is proportional to the input size. In the case of electrohydraulic servomechanisms, the Hydro-Mechanical Converter has the shape of a hydraulic distributor that transforms the input size of mechanical nature (displacement) into a hydraulic size (flow rate / debit). The electrohydraulic servomechanisms with stepper motor do not have in their structure a displacement transducer for achieving the reaction link, their reaction size is of mechanical nature, and it is realized by means of a screw-nut mechanism. The servomechanism with stepper motor is a servomechanism which has the input of electric nature, the output of mechanical nature and the reaction size of mechanical nature
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