Electric drive with contactless synchronous motors

2021 ◽  
Author(s):  
Aleksandr Smirnov
Keyword(s):  
Electric Drive ◽  
Computational Experiment ◽  
Permanent Magnets ◽  
Numerical Models ◽  
Synchronous Machines ◽  
Electromagnetic Excitation ◽  
Synchronous Motors ◽  
Automation Systems ◽  
Synchronous Drive

Contactless synchronous machines are considered, classification, description of structures, construction of analytical and numerical models for research calculations and design of inductor motors with electromagnetic excitation and with excitation from permanent magnets are given. Examples of design and research calculations of the operation of a synchronous drive of automation systems by means of a computational experiment are given.

scholarly journals SIMULATION OF STARTING MODES OF SYNCHRONOUS ELECTRIC DRIVE OF A PUMP STATION

2021 ◽  
Author(s):  
Shakhboz Dadabaev
Keyword(s):  
High Voltage ◽  
Electric Drive ◽  
Rotation Speed ◽  
Synchronous Machines ◽  
Electromagnetic Torque ◽  
Synchronous Motors ◽  
Pumping Station ◽  
Soft Start ◽  
Pump Station ◽  
Simulation Results

The article studies the starting modes of a synchronous electric drive of a pumping station, in direct and soft start of high-voltage synchronous motors of an irrigation pumping station of the first stage. The analysis of negative starting factors of synchronous machines is made on the basis of computer modeling of the research object. The simulation results are clearly shown for the main parameters of a synchronous electric drive, such as its rotation speed, stator currents, electromagnetic torque on the shaft, etc.

The Armature Reaction Inductive Reactances of Synchronous Machines with Permanent Magnets Nonmagnetic Holder

2021 ◽  
pp. 45-57
Author(s):  
Sergey V. ZHURAVLEV ◽  
◽  
Boris S. ZECHIKHIN ◽  
Nikolay S. IVANOV ◽  
◽  
...  
Keyword(s):  
Magnetic Field ◽  
Analytical Solution ◽  
Permanent Magnets ◽  
Form Factors ◽  
Magnetic Core ◽  
Synchronous Machines ◽  
Permanent Magnet Machines ◽  
Electromagnetic Excitation ◽  
Design Scheme ◽  
Armature Reaction

The most widely used design scheme of synchronous machines with radially magnetized permanent magnets and a nonmagnetic magnet holder is considered. To calculate the armature reaction inductive reactances in these machines, it is proposed to use the conventional approach and the expressions obtained on its basis for the armature reaction inductive reactances of synchronous machines with electromagnetic excitation. The features of permanent magnet machines can be taken into account by special calculated coefficients included in these expressions. On the basis of the magnetic field analytical solution of the armature reaction, the special calculated coefficient for the design scheme with a cylindrical yoke of the inductor was determined taking into account the increased nonmagnetic gap between the armature magnetic core and inductor yoke core. By applying the Schwartz method with the use of a scalar magnetic potential, a new magnetic field analytical solution of the armature reaction with a polyhedral yoke of the inductor is obtained. On the basis of this solution, the field form factors of the longitudinal and transverse armature reaction were determined, which take into account the real geometry of this design scheme. Graphical dependences of the special calculated coefficients on the active zone geometric parameters are given.

scholarly journals Design of a direct current motor with a windingless rotor for electric vehicles

2021 ◽  
Vol 4 (5(112)) ◽  
pp. 41-50
Author(s):  
Dmytro Ivliev ◽  
Volodymyr Kosenkov ◽  
Oleksandr Vynakov ◽  
Elvira Savolova ◽  
Viktoria Yarmolovych
Keyword(s):  
Electric Vehicles ◽  
Permanent Magnets ◽  
High Price ◽  
Electromagnetic Excitation ◽  
Active Materials ◽  
Synchronous Motors ◽  
The Road ◽  
Electric Car ◽  
On The Road ◽  
The Cost

Modern electric vehicles typically exploit synchronous motors with magnetoelectric excitation as traction engines. While possessing a series of undeniable advantages, the synchronous motor has one significant drawback ‒ the high cost predetermined by the high price of permanent magnets. In addition, the impossibility to disable a magnetic field in case of engine malfunction can lead to an emergency on the road. Given this, there is a need to design new structures of electrical machines with electromagnetic excitation. The structure of a DC traction motor with electromagnetic excitation involving the rotor or stator segmentation makes it possible to considerably weaken the field of the armature transverse reaction by decreasing magnetic conductivity of the magnetic circuit in the transverse direction. Therefore, such a structure lacks commutating poles and a compensation winding. There are no permanent magnets in the structure, all windings are stationary, an electronic switch is used instead of a collector, and a windingless low-inertia rotor does not require additional measures to remove heat. That all has made it possible to significantly reduce the cost of active materials for the traction engine and improve its reliability. To test the performance of the new design, a full-size model of the engine and a working experimental prototype were fabricated. Applying a synchronous jet engine with magnetization for the BMW i3 electric car as an analog, the engine calculations were performed and its simulation was carried out. The results of the analysis show that the mass of the new engine is 35 % greater than the mass of the analog but the cost of active materials is less than that of the analog by 63 %. The results testify to the possibility of implementing a given structure industrially

Demagnetization Analysis of Additional Permanent Magnets in Salient-Pole Synchronous Machines With Damper Bars Under Sudden Short Circuits

2012 ◽  
Vol 59 (6) ◽  
pp. 2448-2456 ◽  
Author(s):  
Tatsuya Hosoi ◽  
Hiroya Watanabe ◽  
Kazuo Shima ◽  
Tadashi Fukami ◽  
Ryoichi Hanaoka ◽  
...  
Keyword(s):  
Permanent Magnets ◽  
Synchronous Machines ◽  
Salient Pole ◽  
Short Circuits

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.

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