Determining energy-efficient operation modes of the propulsion electrical motor of an autonomous swimming apparatus

Yana Volyanskaya,Oleg Onishchenko,Aleksandr Volkov,Sergey Volyanskiy

doi:10.15587/1729-4061.2017.118984

Abstract

Ensuring the maximum possible navigation range and duration of autonomous functioning of an unmanned swimming apparatus for special purposes was solved by minimizing energy consumption of the electromotive system. In order to achieve it, we proposed a procedure for the estimation of power losses at different static loads and power voltage of the asynchronous baro-unloaded motor of an autonomous swimming device. Special features of the procedure include determining an essentially descending character, loading characteristics of a baro-unloaded asynchronous motor of low capacity; determining the values for magnetic flux of the induction motor, at which under steady operational modes and a partial load, the total power losses are minimal; establishing dependences of performance efficiency and the stator current when controlling voltage at different loads. Employing the proposed procedure in the control algorithm over electromotive system of the device made it possible to enable an energy-efficient change in power voltage at a constant frequency and partial loads

Highlights

Under current economic and political conditions in Ukraine, the state that has to maintain defensive functions of its maritime boundaries faces a difficult task to maximally quickly create autonomous swimming apparatuses (ASA) for special purposes
The propeller, depending on the condition of ASA motion, can be immersed in water not completely. All this leads to complex changes in the nature of load on the apparatus propulsion asynchronous three-phase electric motors (AM)
When propulsion AM operate in the zone of partial loads, which is typical for ASA electromotive systems, their resultant energy efficiency reduces [8, 10]

Summary

Introduction

Under current economic and political conditions in Ukraine, the state that has to maintain defensive functions of its maritime boundaries faces a difficult task to maximally quickly create autonomous swimming apparatuses (ASA) for special purposes (marine unmanned vehicles). We should take into consideration that it is required when creating such a new Ukrainian and highly technological device as an unmanned swimming apparatus: a) to enable control over rotation frequency of propulsion [2] complex of the apparatus in a relatively small range at minimal capital costs, short time of pre-design and structural-technological preparation for production; b) to ensure work of propulsion electric motor with a relatively low capacity (up to 500 Watts) under a baro-unloaded mode [3]; c) to be able to accomplish a number of additional tasks and meet requirements to design, overall architecture and operation of an unmanned vehicle, including power source, control, navigation, positioning, communication, work of additional devices, mechanisms, etc.; d) to resolve a challenging task on designing a special-purpose vessel [4, 5] – to minimize the cost of the apparatus, to ensure minimum weight and size indicators at the maximum-possible special payload, to minimize duration of design and construction Such a complicated and relevant problem is solved only based on a systems approach [4,5,6,7]. These are the problems and unresolved tasks that require detailed study

Literature review and problem statement

Material and methods of research

Main results of the study

Findings

Conclusions