The Increasing Energy Efficiency of the Vibratory Conveying Drives with Electromagnetic Excitation

Despotović, Željko V.; Ribić, Aleksandar I.

doi:10.3923/ijepe.2012.38.42

Cited by 7 publications

(11 citation statements)

References 3 publications

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“…Since the mechanical properties of the processed material can change over time, to support the near-resonant mode at a fixed vibration frequency, it is necessary to use elements with adjustable stiffness or mass, which significantly complicates the device design and increases its price. But in most cases the technological process allows to change the frequency of the forced oscillations in a certain range, which makes it possible to support the nearresonant mode by its regulation [3]. For example, to provide high quality of concrete products the vibration frequency during their processing should be in the range of 65 − 85 Hz [12].…”

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“…In this case, it is expedient to choose the spring stiffness of the vibrator so that the device resonant frequency will be 75 Hz at a nominal mass of the product, and when changing the mass − to adjust vibration frequency tracking the changing frequency of the resonance within the predetermined frequency range. Thus it is possible to provide the vibration device work in the mode of the highest energy efficiency without having to change its mechanical properties.In many works, including [3,7], the authors approve, that the most energy-efficient mode takes place at the resonant frequency. This statement is based on the fact, that in the resonant mode to create a certain vibration amplitude the smallest amplitude of the electromagnetic force is required.…”

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confidence: 99%

“…In many works, including [3,7], the authors approve, that the most energy-efficient mode takes place at the resonant frequency. This statement is based on the fact, that in the resonant mode to create a certain vibration amplitude the smallest amplitude of the electromagnetic force is required.…”

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Energy Efficiency of the Vibratory Device Electromagnetic Drive System

Cherno¹,

Monchenko²

2016

Teh. Elektrodin.

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Introduction. Vibration devices are widely used in industry for many processes, such as vibratory compaction of concrete mixtures, vibrational transportation, separation, etc. [7]. Among the known types of vibratory drives the most promising is an electromagnetic one, which has advantages, such as high reliability, long operating life, high energy efficiency when operating in near-resonance mode, easy control of vibration amplitude, the ability to generate vibrations at frequencies above 100 Hz [6]. The frequency and amplitude of the vibration device oscillations should firstly satisfy the requirements of the technological process and secondly, the vibration frequency should be close to the resonant one, to minimize energy consumption. Since the mechanical properties of the processed material can change over time, to support the near-resonant mode at a fixed vibration frequency, it is necessary to use elements with adjustable stiffness or mass, which significantly complicates the device design and increases its price. But in most cases the technological process allows to change the frequency of the forced oscillations in a certain range, which makes it possible to support the nearresonant mode by its regulation [3]. For example, to provide high quality of concrete products the vibration frequency during their processing should be in the range of 65 − 85 Hz [12]. In this case, it is expedient to choose the spring stiffness of the vibrator so that the device resonant frequency will be 75 Hz at a nominal mass of the product, and when changing the mass − to adjust vibration frequency tracking the changing frequency of the resonance within the predetermined frequency range. Thus it is possible to provide the vibration device work in the mode of the highest energy efficiency without having to change its mechanical properties.In many works, including [3,7], the authors approve, that the most energy-efficient mode takes place at the resonant frequency. This statement is based on the fact, that in the resonant mode to create a certain vibration amplitude the smallest amplitude of the electromagnetic force is required. But the calculations of the vibratory device electromagnetic drive system energy efficiency at different values of the oscillation frequency and the load are not made in any known work. Therefore, today it is not known what efficiency value can be achieved by configuring the system to resonance, and how it will change at the deviation of the vibration frequency from the resonant one. This information is needed for the synthesis of the control system.The aim of the work is to obtain the energy characteristics of vibratory device electromagnetic drive system at a variation of oscillation frequency and the load, as well as to determine the optimal frequency, providing the maximum efficiency.Equations of electromagnetic drive system energy losses. Energy efficiency of a drive system is defined as the product of the efficiencies of its constituent units: the converter, the motor and the gear [8]. There is no a g...

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Energy Efficiency of the Vibratory Device Electromagnetic Drive System

Cherno¹,

Monchenko²

2016

Teh. Elektrodin.

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“…In [4], the processes in the electromagnetic drive of the vibrating conveyor with phase control and with the sinusoidal current half-waves formed by the pulse-width modulation (PWM) were investigated. The authors [4] later note that a thyristor converter with phase control can be used only in cases of a constant load on the working body, since the phase control system does not allow to control the frequency for resonance tuning [5]. Regarding the PWM converter, which forms a sinusoidal current (or semi-wave sinusoid), the work [5] states that the use of a high-frequency PWM signal leads to high energy losses in the converter when switching transistors, as well as in electromagnetic steel.…”

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confidence: 99%

“…The authors [4] later note that a thyristor converter with phase control can be used only in cases of a constant load on the working body, since the phase control system does not allow to control the frequency for resonance tuning [5]. Regarding the PWM converter, which forms a sinusoidal current (or semi-wave sinusoid), the work [5] states that the use of a high-frequency PWM signal leads to high energy losses in the converter when switching transistors, as well as in electromagnetic steel. Therefore, [5] proposes a system that forms multi-polar rectangular voltage pulses that provide a current close to triangular.…”

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Energy Characteristics of the Electromagnetic Vibration Drive With Pulse Power Supply of Vibrator Coils

2023

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Vibrating equipment provides various technological processes, such as transportation, separation, compaction of mixtures. The electromagnetic drive is usually used in vibrating conveyors, feeders and other devices where vibration parameters are automatically controlled. Increasing the energy efficiency of such devices is an important task. The paper examines the influence of the power supply voltage on the energy characteristics of the electromagnetic vibration drive and determines the most effective voltage form. To do this, an analysis of factors affecting the efficiency of the drive was carried out. It was found that one of the factors is the time interval between the maximum current and the minimum value of the air gap, and increasing the efficiency is possible by reducing this interval by forming bipolar rectangular voltage pulses with maximum amplitude, which create narrow sharp pulses of the vibrator coil current. As a result of the numerical modeling of the processes in the drive, it was found that with increasing power, current pulses cause short-term deep saturation of steel, which leads to increased losses and reduced efficiency. Therefore, a zero voltage interval was added between the positive and negative voltage pulses, which limits the peak current values. The simulation of the processes in the vibration drive with the voltage supply of the proposed form was carried out, its energy characteristics were calculated: the dependence of the efficiency on the frequency at different load values, the dependence of the maximum values of the efficiency on the power. It was established that the use of pulsed power supply makes it possible to increase the efficiency of the drive up to 80% in the power range from 0.25 of the nominal value to the nominal one, which is on average 10% more compared to sinusoidal voltage. The dependences of frequency and zero voltage interval optimal values (according to the criterion of maximum efficiency) on power, which can be used in automatic control of the drive, have been obtained. References 10, figures 9, tables 2.

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Mathematical model of the technological vibratory unit with electromagnetic excitation

Neyman

Markov

2020

J. Phys.: Conf. Ser.

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The mathematical model of the technological vibratory unit with electromagnetic excitation is considered to its features that are important for the dynamic design problems. The model is based on the differential equations of electrical balance and mechanical balance, taking into account the mobility degree of inertial masses with spring linkages. The vibratory unit vibration properties are analyzed concerning the power voltage and frequency coupling, interacting inertia masses mobility degree, spring linkages properties, magnetic core steel magnetizing characteristic non-linearity, leakage fluxes, electric, magnetic and mechanical energy losses. The research performed for dynamical design problem solution is distinguished by a novel approach to the estimation of the capability of changing vibration properties of the movable operating element of the technological vibratory unit with an additional mass attached to it. The model design technology based on the structural modelling method supported by Matlab Simulink is proposed. The research results can be useful for specialists in vibration engineering, machines and devices durability dynamics and vibroprotection.

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The Increasing Energy Efficiency of the Vibratory Conveying Drives with Electromagnetic Excitation

Cited by 7 publications

References 3 publications

Energy Efficiency of the Vibratory Device Electromagnetic Drive System

Energy Efficiency of the Vibratory Device Electromagnetic Drive System

Energy Characteristics of the Electromagnetic Vibration Drive With Pulse Power Supply of Vibrator Coils

Mathematical model of the technological vibratory unit with electromagnetic excitation

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