Research of an electromagnetic vibrator with a non-linear power supply

Abstract

Electromagnetic vibration exciters (EMW) are widely used in various sectors of the national economy (chemical, mining, engineering, oil and gas) for transportation and simultaneous processing of bulk cargo, mixing and batching, grinding, separation, etc. Recently, more and more attention has been paid to the problems of their automation. This is caused by the fact that controlled vibration machines can significantly increase and stabilize at a given level of technological processes. Automation of EMVV can be solved only by developing automatic stabilization of performance with closed feedback. Rational design of this kind of sustainability needs theoretical justification. This article discusses the analysis of self-oscillations in electromagnetic exciters with a nonlinear power source used in vibration technology. To analyze the equations, the averaging method was used. Using this method allows obtaining periodic solutions for current and mechanical vibrations. The results of the analysis can be used in the development of self-oscillating electromagnetic exciters.

Improving the quality of 0.4 kV electricity in household appliances due to voltage regulation

“…It is known that, by controlling the thyristor triggering moment, it is possible to influence the shape of the load current curve. If the phase shift φ between the beginning of the "positive" half-cycle of the anode voltage and the beginning of the forward current flow is zero, the shape of the load current curve will be sinusoidal [20][21][22][23].…”

“…For many electrical installations, this is not the nominal mode of operation. To ensure the sinusoidal shape of the current and voltage curves on the load, it is necessary to achieve the opening of the thyristor when the current passes through zero [21][22][23].…”

Transformations of equations with approximation of characteristics of nonlinear elements by power polynomial

“…Where: К=m-1, m-3, … 2,0. Or (21) (22) If the characteristic of a nonlinear element is not symmetric with respect to the origin, then the approximating function has terms and about even powers [21][22][23][24][25]. And for even degrees, one can obtain the following identities:…”

Efficient protection and control of electric drives using solid state circuits

“…Using these investigated circuits, on their basis, a non-contact device was developed to start and protect against the operation of the minimum voltage of AC electric motors, an asynchronous electric drive circuit was proposed (Figure 4). Considering the frequent modes of starting electric motors and operating at low network voltages, a circuit of a non-contact three-phase thyristor starter of an asynchronous electric motor is proposed, consisting of six thyristors, six diodes and resistors, one small-sized intermediate relay and a circuit breaker [21][22][23][24][25][26].…”