Highly Efficient Control of Electric Drives with Synchronous Motors with Permanent Magnets for Uninhabited Underwater Vehicles

2020 ◽  
Author(s):  
Kirill V. Arzhanov ◽  
Vladimir V. Arzhanov ◽  
Alla V. Arzhanova
Keyword(s):  
Permanent Magnets ◽  
Underwater Vehicles ◽  
Synchronous Motors ◽  
Electric Drives ◽  
Highly Efficient ◽  
Efficient Control

scholarly journals RESEARCH OF THE SYSTEM OF AUTOMATIC CONTROL OF THE THREAD TENSION SPEED IN THE SPINNING PROCESS

2021 ◽  
Author(s):  
Gulchehra Alimova ◽  
Isamiddin Siddikov
Keyword(s):  
Mathematical Model ◽  
Automatic Control ◽  
Control Systems ◽  
Electric Drives ◽  
Highly Efficient ◽  
Efficient Control ◽  
Thread Tension ◽  
Spinning Process ◽  
The Creation ◽  
The Relationship

The paper deals with the creation of a mathematical model of the process of stretching the tape, taking into account the tension of the thread. For this purpose, the relationship between the thread tension and the speed of expression of the electric drives is determined. The proposed mathematical model of the process allows one to synthesize highly efficient control systems for spinning equipment.

scholarly journals Properties, Characteristics and Parameters of Permanent Magnet Synchronous Motors under Vector and Scalar Frequency Control

2019 ◽  
Vol 62 (3) ◽  
pp. 205-218 ◽  
Author(s):  
B. I. Firago ◽  
S. V. Aleksandrovsky
Keyword(s):  
Vector Control ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
Frequency Control ◽  
Asynchronous Motor ◽  
Energy Performance ◽  
Permanent Magnet Synchronous Motors ◽  
Technical Literature ◽  
Synchronous Motors ◽  
Electric Drives

In order to improve energy performance and simplify the system of frequency control of the speed of electric drives, the area of application of synchronous frequency-controlled electric drives with both dependent and independent frequency setting of the voltage supplying the engine is being expanded. This is due to the fact that, as compared with asynchronous variable frequency drives, synchronous ones undergo lower power losses and they have rigid mechanical characteristics without speed feedback. Also, the simplest law of frequency control, viz. a proportional one, which, however, provides the maximum electromagnetic torque of the engine unchanged at R1 = 0 at all frequencies due to the constant magnetic flux, is applicable to a synchronous frequency controlled motor. Characteristics and properties of permanent magnet synchronous motors (PMSM) with the dependent frequency setting of supplied voltage (under vector control of PMSM) have been discussed and reviewed in technical literature quite sufficiently. It cannot be said about the PMSM with independent frequency setting reference which work under scalar frequency control. In the present article a comparison of properties and characteristics of vector and scalar frequency controlled PMSM is presented. For a scalar frequency controlled PMSM a function of the relative voltage g on the relative frequency a (g = f(a)) taking into account the PMSM parameters has been defined. The derived function g = f(a) differs from a proportional law of frequency control g = a. It is found that the influence of the parameters on the law of frequency control is small, and it can be applied without adjustment in most cases, in contrast to the frequency control of the asynchronous motor. For scalar frequency control, a method for determining the parameters of synchronous motors has been proposed in accordance with the parameters of synchronous motors with permanent magnets, which are given for operation under vector control. According to the presented methodology the OMRON SGMH-50D engine parameters have been determined for scalar frequency control and the function of g = f(a) have been computed.

scholarly journals Development of a high-quality brushless dc electric drive systems model

Vestnik IGEU ◽  
2020 ◽  
pp. 31-45
Author(s):  
T.H. Abuziarov ◽  
A.S. Plehov ◽  
A.B. Dar’enkov ◽  
A.I. Ermolaev
Keyword(s):  
Electric Drive ◽  
Electric Motor ◽  
Permanent Magnets ◽  
Structural Features ◽  
Bldc Motor ◽  
Electric Drives ◽  
Brushless Dc ◽  
Systems Model ◽  
Semiconductor Converter ◽  
Torque Pulsations

When designing electric drives based on brushless DC motors with permanent magnets (BLDC), which have low level torque pulsations, the problem of modelling non-standard topological solutions appears. The known models of BLDC motors are either based on the assumptions about the symmetry of the stator pa-rameters of the electric motor and/or the ideal form of the phase back-EMF waveform, which reduce the accuracy of evaluating the effectiveness of the proposed solutions or prove unusable for modelling an operation of the electric motor with a non-standard semiconductor converter. It is necessary to develop a mathematical model of the BLDC motor-based electric drive that takes into account the structural features of the electric motor and allows for semiconductor converter configuration variability. The model is designed in the Matlab Simulink environment. The verification is carried out by comparing the modelling results with experimental data obtained previously by other researchers. The proposed method for generating phase back-EMF in the BLDC motor model provides the possibility for the user to set the EMF form templates independent for each phase. The proposed method for stator circuit simulating provides the user with access to each of the stator windings leads as well as with the possibility of asymmetric determination of each parameter of the electric motor. Upon verification, it has been shown that the difference in the control points between the simulated and experimental speed-torque curves does not exceed 3,5 %. The developed model allows analyzing the static and dynamic characteristics of operation modes of non-standard topology BLDC motor-based electric drives taking into account the stator pa-rameters asymmetry and the real phase back-EMF waveform. The specified features of the model allow exploring the operation of the designed electric drive, taking into account the BLDC motor and converter design. The model can be applied when checking atypical design decisions and when changing the set parameters of the electric drive and restrictions on working conditions and target functions to refine the control system algorithms and automate the search for optimal parameters of the motor and the semiconductor converter.

scholarly journals Model-Based Condition-Monitoring and Jamming-Tolerant Control of an Electro-Mechanical Flight Actuator with Differential Ball Screws

Actuators ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 230
Author(s):  
Gianpietro Di Rito ◽  
Benedetto Luciano ◽  
Nicola Borgarelli ◽  
Marco Nardeschi
Keyword(s):  
Condition Monitoring ◽  
Flight Control ◽  
Permanent Magnets ◽  
Deterministic Model ◽  
Fault Tolerant ◽  
Synchronous Motors ◽  
Model Based ◽  
Aerospace Applications ◽  
Major Fault ◽  
Potential Applicability

The work deals with the development of deterministic model-based condition-monitoring algorithms for an electromechanical flight control actuator with fault-tolerant architecture, in which two permanent magnets synchronous motors are coupled with differential ball screws in speed-summing paradigm, so that the system can operate even after a motor fault, an inverter fault or a mechanical jamming. To demonstrate the potential applicability of the system for safety-critical aerospace applications, the failure transients related to major fault modes have to be characterised and analysed. By focusing the attention to jamming faults, a detailed nonlinear model of the actuator is developed from physical first principles and experimentally validated in both time and frequency domains for normal condition and with different types of jamming. The validated model is then used to design the condition-monitoring algorithms and to characterize the system failure transient, by simulating mechanical blocks in different locations of the transmission. The operability after the fault, obtained via fault-tolerant control strategy and position regulator reconfiguration, is also verified, by highlighting and discussing possible enhancements and criticalities.

Control of tick (Acari: Ixodidae) infestation by application of ear tags impregnated with acaricides to cattle in Africa

1985 ◽  
Vol 75 (4) ◽  
pp. 609-619 ◽  
Author(s):  
A. S. Young ◽  
J. J. De Castro ◽  
P. P. Kiza-Auru
Keyword(s):  
Rhipicephalus Appendiculatus ◽  
Synthetic Pyrethroid ◽  
Zebu Cattle ◽  
Highly Efficient ◽  
Boophilus Decoloratus ◽  
Cattle Ticks ◽  
Efficient Control ◽  
Degree Of Control ◽  
Chemical Groups ◽  
Amblyomma Cohaerens

AbstractNine types of plastic ear tags impregnated with organophosphorus, amidine or synthetic pyrethroid compounds were applied to both ears of groups of five Maasai zebu cattle in Narok District, Kenya, and grazed together with five untagged cattle to which no acaricides were applied. Most of the tag types gave highly efficient control of Rhipicephalus appendiculatus Neumann attaching to the head and ears of the cattle, which lasted up to 160 days after application and often completely prevented tick engorgement. All the chemical groups were effective. The most effective tag was a combination of amitraz and permethrin which gave better control than either chemical on its own. Control of Boophilus decoloratus (Koch), Amblyomma cohaerens Dönitz, A. variegatum (F.) and R. evertsi evertsi Neumann attaching to the bodies of cattle was less effective, although most of the tags exerted some effect. Rainfall appeared to reduce the degree of control by the tags. A role for such impregnated ear tags for the control of cattle ticks in Africa is suggested.

scholarly journals Highly efficient separation of rare earths from nickel and cobalt by solvent extraction with the ionic liquid trihexyl(tetradecyl)phosphonium nitrate: a process relevant to the recycling of rare earths from permanent magnets and nickel metal hydride batteries

2014 ◽  
Vol 16 (3) ◽  
pp. 1594-1606 ◽  
Author(s):  
Tom Vander Hoogerstraete ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquid ◽  
Solvent Extraction ◽  
Rare Earths ◽  
Metal Hydride ◽  
Permanent Magnets ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Efficient Separation ◽  
Highly Efficient

The undiluted ionic liquid trihexyl(tetradecyl)phosphonium nitrate was used for cobalt–samarium and nickel–lanthanum separations by solvent extraction.

Magnetic Gearing as a Functional Principle in Electric Drives

2018 ◽  
Vol 882 ◽  
pp. 162-173
Author(s):  
Tobias Gerlach ◽  
Rolf Vollmer ◽  
Andreas Kremser ◽  
Dieter Gerling
Keyword(s):  
Permanent Magnets ◽  
Permanent Magnet Synchronous Machine ◽  
Air Gaps ◽  
Torque Density ◽  
Electric Drives ◽  
Space Harmonics ◽  
Stator Flux ◽  
The Individual ◽  
Flux Reversal Machine ◽  
Stationary Component

The partitioned stator flux reversal machine (PS-FRPM) is a novel stator PM machine topology, which exhibits a higher torque capability than its single stator counterpart and the conventional permanent magnet synchronous machine (PMSM). The PS-FRPM consists of two stators, one which carries the armature winding, and one which is equipped with surface mounted permanent magnets. The rotor is sandwiched between the two stators. The separation of the stator allows a better utilization of the machine volume which results in a higher torque density. Furthermore, because the magnets are placed on a stationary component, they can be cooled effectively. Consequently, critical rare-earth materials can be saved.The structure of the PS-FRPM is very similar to that of magnetic gears. In this paper the torque production of a PS-FRPM is described by means of the magnetic gearing effect. First the magnetic gearing effect is introduced and then the corresponding analytics is transferred to the PS-FRPM. Based on Maxwell's stress tensor, the torque contributions of the individual space harmonics are determined. In contrast to conventional machines, the torque in PS-FRPM is produced by several space harmonics in both air gaps.

scholarly journals Electrical Steels and Their Evaluation for Automobile Motors

2019 ◽  
Vol 10 (2) ◽  
pp. 31 ◽  
Author(s):  
Kunihiro Senda ◽  
Masanori Uesaka ◽  
Soichiro Yoshizaki ◽  
Yoshihiko Oda
Keyword(s):  
Permanent Magnets ◽  
High Efficiency ◽  
High Flux ◽  
Electrical Steels ◽  
Synchronous Motors ◽  
High Frequencies ◽  
Traction Motors ◽  
Motor Efficiency ◽  
Important Target ◽  
Iron Losses

Achieving high efficiency and high torque is an important target in EV motors. This paper describes the effect of the magnetic properties of electrical steels used as core materials for synchronous motors with permanent magnets, which are commonly used as the EV traction motors. It was confirmed that electrical steels, which have high flux density and low iron loss properties can realize high motor efficiency and torque. When PWM excitation is considered, thinner electrical steels are advantageous to suppress increased loss due to higher harmonics. Based on these results, electrical steels having high flux densities and low iron losses at high frequencies were developed.

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