The main parameters that characterize the rotating magnetic field created by a three-phase inductor in the working area of the apparatus in the absence of ferromagnetic particles include: the number of pairs of magnetic poles, the angular speed of their rotation; magnitude and speed of rotation of the magnetic induction vector hodograph, which in real devices is an ellipse with eccentricity increasing when approaching the surface of the working chamber. It is advisable to characterize the magnetic properties of the vortex layer by volume-averaged values;a convenient parameter for energy control of the operation of the vortex layer is itspower density.
Devices АВС - 100, АВС - 150, etc. are focused on uniform distribution of ferromagnetic particles throughout the working area and have a bipolar inductor. When developing an inductor for these devices, the salient-pole design of liquid steel induction rotators was chosen as an analogue. The choice of salient-pole inductor design was associated mainly with simplified manufacturing technology, ease of operation, repair and cooling.
In the central part of the working area of these devices, the magnetic field in the absence of ferromagnetic particles is close to uniform: the hodograph of the magnetic induction vector in this area is close to a circle, coinciding with it in the center of the working area of these devices; the module of the magnetic induction vector is approximately 0.12 T (in various devices from 0.1 to 0.15 T); the angular speed of its rotation is 314 radians per second, which corresponds to a rotation speed of 3000 rpm.
In a working vortex layer, the modulus of the averaged magnetic induction vector reaches values of 0.2 T and lags behind the external field strength by a certain phase angle.
The specific power of the vortex layer in various modes for these devices ranges from 0.1 to 1.5 kW per cubic decimeter of the working area.
The devices have dual-circuit oil-water cooling, power capacitors to compensate for the reactive power of the inductor and are powered from a 380V, 50 Hz network. Other design features of the devices are described in detail in the monograph.
Subsequently, the line of these and similar devices was mastered, modified and expanded by other manufacturers and developers. Currently, devices use both salient-pole inductors and inductors with distributed windings, similar to the stators of electric motors; different types of cooling, different types of power capacitors are used. If necessary, the device includes power converters of voltage and frequency of the supply network. Methods for monitoring and controlling the operation of the vortex layer and technological lines based on it are also being improved.
In scientific and technical developments related to issues of electromechanics of devices of the class under consideration, it is sometimes usedcomputer modellinginductor and behavior of ferromagnetic particles.  An analytical model of the force effect of a circular rotating magnetic field on a magnetic particle in devices with an external electric inductor with a different number of magnetic poles is considered in the work