Rotor Angular Speed Research Articles

Investigation of a Rotor Speed Controlling of a Promising Wind-Driven Power Plant Using Several Variable Elements of its Geometry

Variants of the rotation frequency stabilization of a promising vertically axial wind-driven power plant consisting of a doubly connected stator and a rotor with blades are considered. The stator as a whole is part of the construction, axisymmetric with the rotor, and the rotor is slightly buried in the upper part of the stator — the bell. This plant can be included as an element in a complex power plant for additional and emergency power supply of both stationary and mobile objects, for example, surface robotic systems. The paper proposes to use an aerodynamic method of the rotor angular speed stabilization by controlling the positions of two variable design elements of the plant with respect to its stator. As such elements, a lower guide structure (one of the stator elements) and an aerodynamic brake flap can be used. The rearrangement of both elements positions relative to the stator changes the effective cross section for the interaction of the wind flow entering the installation with the rotor. The method of controller synthesis by the angular speed of the rotor rotation is considered in detail. A feature of this controller is the presence of two control channels with one state variable. First, it is necessary to determine the dynamic ranges of torque control on the rotor shaft for each of the variable geometry elements. This allows to correctly select the switching condition between the two control channels depending on the degree of deviation of the desired flow rate from the current speed. Based on the second-order control error equation, the desired control law of the angular rotor speed is obtained. Using the example of the problem solving of angular speed stabilization with given quality criteria, we simulated a synthesized control system for various initial data. It is shown that the constructed controller is capable of effectively countering the influence of wind disturbances in a wide range of deviations of the current speed from the frequency desired for a given target value.

Optimization of Proportional Integral Derivative Parameters of Brushless Direct Current Motor Using Genetic Algorithm

Optimal performance of the Brushless Direct Current (BLDC) motor is to be realized using an efficient Proportional Integral Derivative (PID) controller. However, conventional tuning technique fails to perform satisfactorily under parameter variations, nonlinear conditions and time delay. Also using conventional technique to tune the parameters gain of the PID controller is a difficult task. To overcome these difficulties, modern heuristic optimization technique are required to optimally tune the Proportional, Integral, Derivative of the controller for optimal speed control of three phase BLDC motor. Thus, genetic algorithm (GA) based PID controller was used to achieve a high dynamic control performance. The Brushless DC Motor mathematical equation which describes the voltage and corresponding rotational angular speed and torque of the brushless DC motor was employed using electrical DC Machines theorem. The Genetic algorithm was further analyzed by adopting the three common performance indices i.e. Integral Time Absolute Error (ITAE), Integral Square Error (ISE) and Integral Absolute Error (IAE) in order to capture and compare the most suitable BLDC Motor speed and torque control characteristics. All simulations were done using MATLAB (R2018a). The simulation result showed that the system with GA-PID controller had the better system response when compared with the existing technique of ZN-PID controller.

Robust sensorless low‐speed trajectory tracking for a permanent magnet synchronous motor: An extended state observer based backstepping control approach

This article deals with the low‐speed sensorless trajectory tracking control of a permanent magnet synchronous motor (PMSM). The rotor position and angular speed are obtained through back electromotive forces (back‐EMF), using extended state observers (ESOs) in the alpha‐beta coordinates. Additionally, the estimation of the back‐EMF is used by an algebraic module to reconstruct online the position and speed using an off‐line estimation of the back‐EMF parameter . The control law is derived using a robust recursive controller design methodology, namely; the backstepping design approach in the d‐q coordinates. Estimation schemes allow the adaptation of the angular position, angular speed, and the load torque parameters in the control law. With this adaptation, the controller achieves the necessary robustness to reduce the effects of endogenous and exogenous perturbations present in the PMSM system. The trajectory tracking task is achieved at low angular speed, with the presence of a load torque applied to the motor shaft. Experimental results at low‐speed and rated load/no‐load conditions are presented to demonstrate the effectiveness and robustness of the proposed scheme.

Simulation of the Grain Trajectory along Working Bodies of the Pneumatic Mechanical Dehuller

The aim of this study was to determine control parameters of the pneumomechanical peeling machine for grain crops by changing the angular rotational speeds of its main working bodies, a blade disk (rotor) and a deck, to provide optimal dehulling conditions (removing films (outer shells) from the grain. Based on the model representation of the air flow, changes in the magnitude and direction of the grain velocity under the action of the air flow of the opposite direction created by the reversible deck were examined. A mathematical model of grain movement in the working space of a pneumatic mechanical dehuller is presented, which takes into account the real aerodynamics of a rotating air flow, where the dehulling efficiency is determined by the speed and direction of grain flight. The numerical implementation of this model suggests that the value of the grain velocity when hitting the deck is mainly due to the angular rotational speed of the disk and hardly depends on the angular rotational speed of the deck. The direction of the grain velocity during impact is mainly related to the angular rotational speed of the deck and the curvature of the blade at the edge of the disk. This model makes it possible to control the operation of the dehuller, change the angular rotational speeds of the disc and the deck, and affect the direction of impact of the grain against the deck and the magnitude of the impact interaction, thus making it possible to create optimal conditions for dehulling.

Analysis of Structural Vibrations of Vertical Axis Wind Turbine Blades via Hamilton’s Principle — Part 2: Exact and Approximate Solutions

In this part 2, we provide a detailed solution to the beam equations derived in Part 1 for a VAWT blade. The main results have been outlined in the abstract of Part 1 which includes the effects of various geometrical and physical parameters such as blade length [Formula: see text], chord length [Formula: see text], radius [Formula: see text] and angular speed [Formula: see text] as well as material damping [Formula: see text]. It is shown that among the four dimensions of deformation lateral bending is the dominant factor in determining the natural frequencies of the blade. In case the blade is rotating with a constant angular speed, the dispersion relation of the 1 degree-of-freedom (DOF) motion for lateral bending can be exactly derived that an implicit function of the natural, i.e. resonant frequencies has to be solved by a root-finding method. The mode shape function is then explicitly obtained. In particular, the natural frequencies of the 1-DOF motion for the rotating blade are shown to be conveniently approximated by simple analytical formulas in terms of those for the stationary blade and the angular speed of rotation. The dependence of the natural frequencies on the chord length can also be approximated analytically by a ratio formula for given blade length to chord ratio. In addition, resonance maps of natural frequency plotted versus various parameters are provided to fully exploit the usefulness of the main results. Through a series of analysis of 2-DOF systems, we show the respective importance of the centrifugal force, coupling deformation and the Coriolis force in modifying the natural frequencies of the 1-DOF model rather than simply ignoring any of these effects.

Numerical Simulation of Isolated Main Rotor and Full Helicopter Configuration in Vertical Autorotative Descent

This paper presents and discusses the results of the transient numerical simulation carried out for an isolated main rotor model and a helicopter in vertical descent autorotation by developing the 6-degree of freedom, rigid-body equations of helicopter motion. The Unsteady Reynolds Averaged Navier-Stokes model is used to simulate the unsteady flow field surrounding four-bladed BO-105 isolated main rotor and complete helicopter which includes the fuselage and the tail rotor. The principal autorotation characteristics for the helicopter such as induced velocity, rate of descent, main rotor angular speed, thrust and torque have been calculated. The simulation results show the creation of a spanwise flow on the upper surface of the blade, and moving fluid in the direction of the blade tip in a region downstream and beneath the leading edge vortex. The aerodynamic characteristics on the complete helicopter are similar to the ones attained for the isolated rotor simulation.

Автоматизований експертний комплекс із дослідження та прогнозування параметрів силових енергетичних установок локомотивів

The article describes the possibilities of creation and the results of the automated expert complex using, which is designed to solve improving problems of the locomotive fleets operation, which are implemented using modern intelligent systems. Monitoring and diagnostic procedures provide the implementation of the controlling tasks of the locomotive power facilities (LPF) functioning parameters. The expert system complex (ESC-LPF) implements the basic tasks of creating a system for analyzing, diagnosing and predicting the state of LPF based on signals of the angular speed of the crankshafts rotation. In ESC-LPF expertise tasks are implemented by combining methods of digital signal processing, statistical analysis, classification and the use of empirical experts’ knowledge. The structure, models and results of diagnosing LPF are given.

Estimation of inverter voltage disturbances for induction machine drive using LPV observer with convex optimization

This paper presents a Linear Parameter-Varying (LPV) observer for an Induction Machine (IM) under sinusoidal DC-supply disturbances. The observer estimates not only the IM state variables, but also the disturbances considered as a part of the states. As the extended IM model depends on the stator angular speed ωs and the rotor angular speed ωr, the proposed observer is designed by convex optimization to induce a convergence of the observer for a predetermined range of ωs and ωr. The estimated disturbances can be used to compensate for the real disturbances. The simulation results show the effectiveness of the observer, and experimental results on a laboratory test-bench have been obtained. The proposed method can be extended to other type of motor drives.

Investigation of the Quality of the Mixture at the First Stage of Operation of a Gravitational Apparatus

The quality of the mixture obtained after the first stage of batch mixing of loose components in the preparation of a finished mixture with a ratio of 1:10 or more is assessed, according to the proposed method of three stages and the results of stochastic simulation of the process of mixing of loose materials in a gravitational apparatus during operation of drums with screw-wound brush elements installed above the trays and with inclined bumpers. The models of the formation of rarefied torches of two types of particles in two cases were employed: (1) after the interaction with the brush elements of the layers of dosage components coming from the drum–tray gap and (2) after the impact of the incoming torches on the bumper. For the first stage of mixing, dependences of the volume and weight fraction of the key component on the reflection angles are simulated with allowance for the physical mechanical properties of the materials and the design and regime parameters of the apparatus, based on the corresponding nonequilibrium differential distribution functions for the number of particles of each component in the angle of scattering from the brush elements (case 1) and the angle of reflection from the bumpers surface (case 2). Using the proposed recurrence relation for dosage materials, the coefficient of inhomogeneity of the mixture at the first stage of mixing particulate components is calculated with the focus on the most significant factors of a quality mixing: the angular speed of drum rotation ω; the degree of deformation of brush elements Δ (the ratio of their length to the height of the drum–tray gap); and the angle of inclination of bumpers to the horizon ψ1. Analysis of the theoretical and experimental results showed their satisfactory agreement and made it possible to reveal the most rational ranges of variation of the сhosen process parameters at the first mixing stage: ω = (45.5–47.2) s–1; Δ = (1.48–1.52); and ψ1 = (0.87–1.04) rad. These findings can be used in the development of the engineering methodology for calculating new gravity mixers.

Speed Observer Structure of Induction Machine Based on Sliding Super-Twisting and Backstepping Techniques

This article presents an analysis of the two speed observer structures which are based on the backstepping and sliding super twisting approach. The observer stabilizing functions result from the Lyapunov theorem. To obtain the observer tuning gains the observer structure is linearized near the equilibrium point. The rotor angular speed is obtained from nonadaptive dependence. In the sensorless control system structure the classical PI controllers and transformation to the multiscalar variables are applied. The theoretical derivations are verified in experimental waveforms. Comparison of both speed observer structures is presented for nominal speed, load torque injections while regenerating mode, very low speed range and the uncertainties of nominal parameters of induction machine.

Исследование динамической неуравновешенности вращающейся механической системы

The paper presents the results of development of an automated laboratory complex for the study of dynamic reactions of bearings of a rotating mechanical system. This complex includes an electromechanical model unit equipped with sensors for measuring reactions and angular speed of the system rotation, a power supply and control unit and a PC for processing the results of measurements and calculations of dynamic reactions. The theoretical basis for calculating the dynamic reactions of the unbalanced rotating mechanical system bearings is given, and a description of the research laboratory complex is provided. The results of experimental determination of these reactions as well as the corresponding calculated dependences of the latter on the angular speed of rotation and the degree of system unbalance are presented. The presence of a region of mechanical system insensitivity to its dynamic unbalance caused by the effects of friction in the bearings is confirmed. There is a good agreement between the proposed method for calculating dynamic reactions of rotating mechanical system bearings and experimental data on their measurement. The effectiveness of the developed laboratory complex in the training process at higher school when teaching the appropriate section of theoretical mechanics is noted.

Mechanistic Studies for Electrochemical Self-Assembly of CuSCN/Stilbazolium Dye Hybrid Thin Films

We have found electrochemical self-assembly (ESA) of inorganic / organic hybrid thin films in which the inorganic is CuSCN, known as a wide bandgap p-type semiconductor, whereas the organic is 4-N,N-dimethylamino-4’-N’-methylstilbazolium chromophore (abbreviated as DAS) as its salt with tosylate (DAST) known to exhibit second-order nonlinear optical property for terahertz emitters. DAS is also known to yield a layered inorganic-organic hybrid crystal in a (DAS)(Cu5I6) composition [1]. Strong dipole-dipole interaction of the DAS chromophores aligned between the CuI layers results in a spontaneous photocarrier generation and ambipolar transport in a single absorber solar cell. Thus, CuSCN/DAS hybrid thin films can be attractive alternatives for such opto-electrical applications, when ordered arrangement of DAS chromophore is achieved during ESA.In our previous study, switching of dye loading mechanism has been suggested, depending on DAS concentration (C DAS) in the bath [2]. In low C DAS, the loading is limited by diffusion so that DAS is entrapped within CuSCN crystal grains, while surface reaction of hybridization begins to limit the dye loading in high C DAS, resulting in formation of unique nanostructures as well as phase separation of inorganic and organic domains.In this study, electrochemical analysis by employing rotating disk electrode (RDE) has been performed to verify the mechanism of ESA and also to explore the limit of DAS loading. Electrodeposition of CuSCN undergoes as limited by transport of 1 : 1 complex between Cu2+ and SCN- ions, namely [Cu(SCN)]+ species, near 100% Faradic efficiency with marginal influence by the presence of DAS. Thus, the rate of CuSCN precipitation, P CuSCN, is always proportional to the concentration of the complex (C comp), and also to ω 1/2 (ω = angular speed of rotation of RDE) therefore P CuSCN can be expressed Eq. (1) from Levich equation. P CuSCN = J/F = 0.62×C comp×D comp 2/3×ν -1/6×ω 1/2 ··· (1)On the other hand, the rate of DAS precipitation, P DAS, should also be proportional to ω 1/2 under the regime of diffusion limited loading with a given C DAS, and is independent of CuSCN formation rate. P DAS = 0.62×C DAS×D DAS 2/3×ν -1/6×ω 1/2 ··· (2)Plots of P DAS against C comp for variation of C DAS were examined, and indeed such a trend as predicted from the above-mentioned model was found (Fig. 1). In the high C comp range, P DAS is independent of C comp and appears proportional to C DAS, because of the diffusion limited loading mechanism. When C comp goes below certain concentration, P DAS changes proportionally to C comp, while its slope also increase as dependent on C DAS. The relationship between the switching C comp and C DAS yields C DAS / C comp = 1/31 as the border for the switching of the mechanism [3], whereas the dependence of the slope on C DAS in the low C comp range should reveal the stoichiometry of surface complex between CuSCN and DAS. When the rate surface complex formation, P DAS become proportional to the P CuSCN, assuming n of DAS complexes with single CuSCN site yields the equilibrium as the right and the surface is expected to be always equilibrated such equation, P CuSCN + nC DAS ⇄ P DAS ··· (3)Stability constant K should be expressed like Eq. (4), K = P DAS/P CuSCN × C DAS n ··· (4)Eq. (4) can be re-written by inserting Eq. (1), P DAS/C comp= 0.62×D comp 2/3×ν -1/6×ω 1/2 ×K×CDAS n ··· (5)Plotted slope of Fig. 1 in the low C comp range (P DAS/C comp) against C DAS and did fitting with n as variable and then resulted n = 0.6. It means approximately one DAS coordinating two CuSCNs and stability constant K can be calculated as 6.78×102 mol−0.5 cm2.5.[1] Elena Cariati et al., Adv. Mater., 13, 1665-1668 (2001).[2] Yuki Tsuda et al., Monatshefte für Chemie, 148, 845-854 (2017).[3] Yuki Tsuda et al., J. Electrochem. Soc. 166(9) B3096-B3102 (2019). Figure 1

Turbine Generator Rotor Vibrations with Rubbing in the Span and Supports

The article presents an algorithm for and results from studying the motion of a rotor involving its simultaneous rubbing against the stator elements in the turbine set span and supports. The aim of the study was to develop the mathematical model describing vibration of the rotor resting in a few supports and to select the main assumptions regarding the contact interaction between the rotor and stator that will make it possible to model a real vibrational process that involves rubbing. An abrupt loss of balancing in the rotor’s second span section at the angular rotation speed is taken as the initial disturbance upsetting the turbine set’s normal operation. The case of a constant rotor rotation speed with loss of balancing followed by development of contact interaction between the rotor and stator elements is considered. This scenario seems to be the most plausible because the interaction persists for a short period of time during which the safety system still remains silent in producing the command to disconnect the steam supply to the turbine, and the torque on its shaft remains constant. It is shown that with the adopted clearances in the turbine set span and supports, with the loss of balancing corresponding to detachment of the mass of one turbine blade, and with increased damping in the supports, the rotor motion is accompanied by rubbing in the turbine set supports and span. If the damping coefficient in the supports does not exceed the value of this parameter in the plain bearing oil film, asynchronous reverse whirl of the rotor develops, which is characterized by self-excited vibration caused by the effect of contact interaction forces between the rotor and stator. Owing to consideration of the rotor design features, its frequency characteristics, including the change in the frequency characteristics of the rotor–supports system due to additional reactions arising at the moments in which the rotor comes into contact with the stator, it becomes possible to model the vibration development process not only during strong (when whirl is excited) but also during weak (possible excitation of low-frequency vibration) interactions between the rotor and stator and to analyze the influence of detuning from resonances and other factors on the development of self-excitation processes in systems closer to real ones.

Analysis and emulation of pitch control forces in wind turbines

In this paper, a hardware in the loop (HIL) scheme using a polynomial approximation for the calculation of aerodynamic forces associated with wind turbine blades is presented. The proposed approach allows the real-time calculation of forces acting on a blade for use as input data for a force emulating system. The blade element momentum (BEM) theory was used to calculate the axial and tangential forces, but an iterative algorithm needs to be executed for each time of the system’s operation. In order to allow a real-time calculation, the BEM algorithm can be executed for a range of rotor angular speeds, wind velocities, and pitch angles covering the conditions under which the wind turbine will operate. The resulting power, torque, and forces are then approximated by polynomials and implemented in an HIL test facility. A comparison between the results obtained from the BEM algorithm and polynomials demonstrates the accuracy of the proposed approach. An experimental setup comprised of the software used for the force and pitch angle calculation and the hardware used for the force emulation and pitch angle control is presented. Experimental results obtained with the system running in real-time demonstrate the ability to apply effective moments without the need for an extensive test structure.

Nonequilibrium carbon black suspensions used in synthesis of polymer composite material

Nowadays polymer matrix-based composite material with various carbon fillers are widely used to protect radioequipment from different interference, to improve characteristics of radar absorbing coatings. Current synthesis processes are sophisticated and rather costly. The challenge is to develop new methods of producing composite materials by efficient knowledge intensive technologies to reduce the cost of products. The paper studies possibility of producing composite material on the basis of elastic polyurethane foam with carbon fillers using polyurethane impregnation in nonequilibrium black carbon suspension. Suspension composition: running water and carbon-bearing powders of nanometer range: fullerene black carbon, Taunite (multi-layer carbon nano tube material), technical carbon T900, wood soot. Nonequilibrium suspension was produced by treatment in hydrodynamic generator of rotor type (cavitation mode). Angular rotation speed of the rotor ω = 10000 rpm.

ОПРЕДЕЛЕНИЕ ВЛИЯНИЯ ДИНАМИЧЕСКИХ ХАРАКТЕРИСТИК СМЕСИТЕЛЕЙ НА СТРУКТУРНО-МЕХАНИЧЕСКИЕ СВОЙСТВА РЫБНЫХ КУЛИНАРНЫХ ФАРШЕЙ

The article presents the empirical results of estimating the dependence of viscoplastic properties of the minced ordinary fish raw materials from the kinematic and dynamic characteristics of mechanisms applied in the course of processing. When mixed in mechanical mixers, minced fish is subjected to shear and normal effects of rotating parts that create a complex three-dimensional flow. Optimization of the process of obtaining viscous-plastic culinary products depends on the dynamics of movement of the studied objects and the influence of working parts of various configurations. To establish the relationship between the duration of mixing, the angular speed of rotation of the working part of the horizontal mixer and general structural and mechanical properties of minced fish, there were carried out experimental studies using various types of mixer working parts: conveyer, screw and blade. The influence of the rotation speed of the mixer working part on the change in the rheological characteristics of the investigated raw materials has been confirmed. Specific energy costs should be emphasized as one of the main criteria for evaluating the performance of the supporting equipment. This parameter depends on redistribution of components during their mixing, changes in the structural and mechanical properties of minced fish and structural characteristics of the working parts. It has been stated that the lowest energy consumption and optimal mode for viscoplastic mixed mass can be achieved by using blades with an inclination angle to the axis of rotation = 20–30° and a humidity increase of mixed mass up to 0.7–0.8 kg/kg.

Impact of a rotating cone on forced convection of Ag–MgO/water hybrid nanofluid in a 3D multiple vented T-shaped cavity considering magnetic field effects

Forced convection of hybrid Ag–MgO/water nanofluid in a three-dimensional T-shaped vented cavity with multiple ports under the effects of a inner rotating cone and magnetic field is numerically studied with finite volume method. The simulation is performed for various values of parameters such as: Reynolds number (between 100 and 1000), Hartmann number (between 0 and 60), angular velocity of the rotating cone (between − 200 rad/s and 0), aspect ratio of the circular cylinders of the base of the cone (between 0.5 and 2) and nanoparticle solid volume fraction of the hybrid nanofluid ( $$\phi _1$$ between 0 and 0.01, $$\phi _2$$ between 0 and 0.01). It was observed that the average heat transfer rate rises with higher values of Reynolds number, Hartmann number above a specified value, angular rotational speed of the cone, aspect ratio of the cone for values above 1 and solid nanoparticle volume fractions of the hybrid particles. In total, 61% of average heat transfer enhancement for left horizontal upper surface is achieved with the imposed magnetic field. The enhancement in the average Nusselt numbers is 25.6% for the rotating cone at the highest angular velocity as compared to a motionless one. The average heat transfer increases almost linearly with hybrid solid nanoparticle volume fraction, while 8.96% and 15.52% enhancements are obtained for varying the solid volume fraction of the particles with the lower and higher thermal conductivity up to 0.01.

Engineering of Light Electric Commercial Vehicle

The paper describes the process and results of the development of the light commercial electric vehicle. In order to ensure maximum energy efficiency of the developed vehicle the key parameters of the original electric motor. The article also presents the results of power electronic thermal calculation. For the mathematical model of the vehicle, the driving cycle parameters of the electric platform were determined in accordance with UNECE Regulations No 83, 84. The driving cycle was characterized by four successive urban and suburban cycles. The mathematical model also takes into account the time phases of the cycle, which include idling, vehicle idling, acceleration, constant speed movement, deceleration, etc. The model of the electric part of the vehicle was developed using MatLab-Simulink (SimPowerSystems library) in addition to the mechanical part of the electric car. The electric part included the asynchronous electric motor, the motor control system and the inverter. This model at the output allows to obtain such characteristics of the electric motor as currents, flows and voltages of the stator and rotor in a fixed and rotating coordinate systems, electromagnetic moment, angular speed of rotation of the motor shaft. The developed model allowed to calculate and evaluate the performance parameters of the electric vehicle. Technical solutions of the electric vehicle design were verified by conducting strength calculations. In conclusion, the results of field tests of a commercial electric vehicle are presented.

A Novel Z-blade Reaction Type Turbine for Low Head Low Flow Water Condition

This paper discusses the performance characteristics on efficiency and applicability of the test unit under low-head and low-flow condition for a novel Z-blade reaction type hydraulic turbine. Unlike large hydro power system, this technology’s superiority lies in the fact that it can harness electrical energy even from a small stream of water as energy sources and it does not poses any adverse environmental impact. This turbine was developed for an ideal and practical case which investigated applying the principal equations that were derived using the philosophies of conservation of mass, momentum, and energy. Assuming frictional losses factor or k-factor for different operating head, the relationship between rotor diameter, angular speed, flow rate, and power output was plotted and elaborated with allusion to the experimental data. Experiments were carried out at 5m head and below with the water flow rate less than 2.5L/sec, and it was evaluated against theoretical results. The turbine has a capability to achieve high values of rotational speed (up to 500 rpm) with minimal mass flow rate and high efficiency (up to 78%) at low head water condition (5m)

Speed observer of induction machine based on backstepping and sliding mode for low‐speed operation

AbstractThis paper presents a speed observer design based on backstepping and sliding mode approaches. The inputs to the observer are the stator current and the voltage vector components. This observer structure is extended to the integrators. The observer stabilizing functions contain the appropriate sliding surfaces which result from the Lyapunov function. The rotor angular speed is obtained from the non‐adaptive formula with a sliding mode mechanism. It allows improvement of the robustness of parameters uncertainties and the zero rotor speed to work (near to the unobservable region). In the sensorless control system, the classical first‐order sliding‐mode controllers are applied with the transformation of the multi‐scalar variable. The proposed control system structure can be named full‐decoupled due to multi‐scalar variables transformation and the feedback control law obtained from the Lyapunov theorem. The theoretical derivations are verified in experimental waveforms. The sensorless control system's robustness is verified in the experimental investigations by using the nominal machine parameters uncertainties method.