scholarly journals Comparative Analysis of Two and Four Current Loops for Vector Controlled Dual-Three Phase Permanent Magnet Synchronous Motor

Electronics ◽  
2018 ◽  
Vol 7 (11) ◽  
pp. 269 ◽  
Author(s):  
Muhammad Ahmad ◽  
Zhixin Wang ◽  
Sheng Yan ◽  
Chengmin Wang ◽  
Zhidong Wang ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Fault Tolerant ◽  
Permanent Magnet Synchronous Motor ◽  
Voltage Source ◽  
Permanent Magnet Synchronous Motors ◽  
Torque Density ◽  
Electromechanical Energy Conversion ◽  
Three Phase ◽  
Electromechanical Energy

Dual three-phase (DTP) permanent magnet synchronous motors (PMSMs) are specialized machines which are commonly used for high power density applications. These machines offer the merits of high efficiency, high torque density, and superior supervisor fault tolerant capability compared to conventional three-phase AC-machines. However, the electrical structure of such machines is very complicated, and as such, control becomes challenging. In conventional vector controlled DTP-PMSMs drives, the components of the dq-subspace are associated with electromechanical energy conversion, and two currents, i.e., Id and Iq belonging to this subspace, are used in feedback-loops for control. Such orthodox control methods can cause some anomalies e.g., the voltage source inverter’s (VSI) dead time effect and other nonlinear factors, and can induce large harmonics. These glitches can be greatly alleviated by the introduction of the two-extra current loops to directly control the currents in Z1Z2-subspace in order to suppress the insertion of harmonics. In this paper, two approaches—one with two-current loops and other with four-current loops—for vector controlled DTP-PMSMs are investigated with the aid of different MATLAB-based simulations. Furthermore, in the paper, the influence of additional current loops is quantified using simulation-based results.

scholarly journals Fault Tolerant Control of PMSM Three-Phase Four-Switch Inverter

2021 ◽  
Vol 2083 (2) ◽  
pp. 022073
Author(s):  
Yuan Cao ◽  
Fuzhi Jing ◽  
Heng Wan
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Fault Tolerant ◽  
Permanent Magnet Synchronous Motor ◽  
Fault Tolerant Control ◽  
Synchronous Motor ◽  
High Power Density ◽  
Transportation Industry ◽  
Three Phase ◽  
Fast Dynamic

Abstract Permanent Magnet Synchronous Motor (Permanent Magnet Synchronous Motor, hereinafter referred to as PMSM) has the characteristics of small size, high efficiency, high power density and fast dynamic response, etc., and more and more applications in the transportation industry. This also has higher and higher requirements for the reliability and security of PMSM drivers. In this paper, the fault tolerant control strategy of PMSM based on three phase four switch inverter is proposed based on vector control and the simulation verification is carried out.

scholarly journals A new self-propelled magnetic bearing with helical windings

2016 ◽  
Vol 472 (2196) ◽  
pp. 20160579
Author(s):  
B. Shayak
Keyword(s):  
Permanent Magnet ◽  
Stiffness Matrix ◽  
Control Algorithm ◽  
High Efficiency ◽  
Permanent Magnet Synchronous Motor ◽  
Magnetic Bearing ◽  
High Load ◽  
Output Torque ◽  
Three Phase ◽  
Torque Angle

In this work, a design is proposed for an active, permanent magnet based, self-propelled magnetic bearing, i.e. levitating motor having the following features: (i) simple winding structure, (ii) high load supporting capacity, (iii) no eccentricity sensors, (iv) stable confinement in all translational dimensions, (v) stable confinement in all rotational dimensions, and (vi) high efficiency. This design uses an architecture consisting of a helically wound three-phase stator, and a rotor with the magnets also arranged in a helical manner. Active control is used to excite the rotor at a torque angle lying in the second quadrant. This torque angle is independent of the rotor's position inside the stator cavity; hence the control algorithm is similar to that of a conventional permanent magnet synchronous motor. It is motivated through a physical argument that the bearing rotor develops a lift force proportional to the output torque and that it remains stably confined in space. These assertions are then proved rigorously through a calculation of the magnetic fields, forces and torques. The stiffness matrix of the system is presented and a discussion of stable and unstable operating regions is given.

On Study of High Speed Permanent Magnet Synchronous Motor without Iron Core

2013 ◽  
Vol 706-708 ◽  
pp. 882-887
Author(s):  
Ji Zhu Liu ◽  
Yang Jun Wang ◽  
Tao Chen ◽  
Ming Qiang Pan ◽  
Li Guo Chen ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
High Efficiency ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Iron Core ◽  
Torque Density ◽  
Optimized Model ◽  
Low Efficiency ◽  
Design And Manufacture

Iron loss will be rapidly increased when the permanent magnet iron core synchronous motor runs at a high speed, which makes the motor produce so much heat that causes low efficiency of the motor and even burns out the motor. The iron-core-free permanent magnet synchronous motor remedies this defect and has a high efficiency at high speed. This article makes a comparative analysis on the iron-core-free permanent magnet synchronous motor torque density with different slot engagement classifications. The paper puts forward an optimized model of permanent magnet synchronous motor without the iron core. The technology of the permanent magnet synchronous motor without iron core is studied based on this model which provides a method to design and manufacture the iron-core-free permanent magnet synchronous motor.

scholarly journals Fault-Tolerant Control of a Three-Phase Permanent Magnet Synchronous Motor for Lightweight UAV Propellers via Central Point Drive

Actuators ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 253
Author(s):  
Aleksander Suti ◽  
Gianpietro Di Rito ◽  
Roberto Galatolo
Keyword(s):  
Permanent Magnet ◽  
Fault Tolerant ◽  
Permanent Magnet Synchronous Motor ◽  
Fault Tolerant Control ◽  
Synchronous Motor ◽  
Central Point ◽  
Fault System ◽  
Three Phase ◽  
Electrical Faults ◽  
Torque Ripples

This paper deals with the development and the performance characterization of a novel Fault-Tolerant Control (FTC) aiming to the diagnosis and accommodation of electrical faults in a three-phase Permanent Magnet Synchronous Motor (PMSM) employed for the propulsion of a modern lightweight fixed-wing UAV. To implement the fault-tolerant capabilities, a four-leg inverter is used to drive the reference PMSM, so that a system reconfiguration can be applied in case of a motor phase fault or an inverter fault, by enabling the control of the central point of the three-phase connection. A crucial design point is to develop Fault-Detection and Isolation (FDI) algorithms capable of minimizing the system failure transients, which are typically characterized by high-amplitude high-frequency torque ripples. The proposed FTC is composed of two sections: in the first, a deterministic model-based FDI algorithm is used, based the evaluation of the current phasor trajectory in the Clarke’s plane; in the second, a novel technique for fault accommodation is implemented by applying a reference frame transformation to post-fault commands. The FTC effectiveness is assessed via detailed nonlinear simulation (including sensors errors, digital signal processing, mechanical transmission compliance, propeller loads and electrical faults model), by characterizing the FDI latency and the post-fault system performances when open circuit faults are injected. Compared with reports in the literature, the proposed FTC demonstrates relevant potentialities: the FDI section of the algorithm provides the smallest ratio between latency and monitoring samples per electrical period, while the accommodation section succeeds in both eliminating post-fault torque ripples and maintaining the mechanical power output with negligible efficiency degradation.

Multiphase permanent magnet synchronous motors with fractional slot windings

2016 ◽  
Vol 35 (6) ◽  
pp. 1937-1948 ◽  
Author(s):  
Cezary Jedryczka ◽  
Wojciech Szelag ◽  
Zbigniew Jerry Piech
Keyword(s):  
Permanent Magnet ◽  
Fault Tolerant ◽  
Computer Code ◽  
Permanent Magnet Synchronous Motors ◽  
Magnetomotive Force ◽  
Content Type ◽  
Synchronous Motors ◽  
Three Phase ◽  
Torque Pulsations ◽  
Fractional Slot

Purpose The purpose of this paper is to investigate advantages of multiphase permanent magnet synchronous motors (PMSM) with fractional slot concentrated windings (FSCW). The investigation is based on comparative analysis and assessment of FSCW PMSM wound as 3, 6, 9 and 12 phase machines suited for low speed applications. Design/methodology/approach The investigations are focussed on distortions of back electromotive (emf) and magnetomotive force (mmf) with the torque ripples and motors’ performance taken into account. The finite element models with the aid of customized computer code have been adopted for motor winding design and back emf, mmf and motor performance analyses. Findings The novel multiphase winding layouts were found to offer lower content of sub-harmonics in the mmf waveforms compared with the traditional three-phase machine designs. Moreover, the investigated multiphase machines exhibited higher average value of the electromagnetic torque, while the multiphase PMSM machines with FSCW were further characterized by significantly lower torque pulsations. Originality/value The analyses presented in this paper demonstrate that PMSM with FSCW are advantageous to their counterpart three-phase machines. Specifically, they offer higher performance and are more suitable to work with multiple drives supplying segmented winding system. This ability of using multi-drive supply for one motor offers flexibility and cost reduction while increasing fault tolerant power train system.

scholarly journals Effect of Pole and Slot Combination on the AC Joule Loss of Outer-Rotor Permanent Magnet Synchronous Motors Using a High Fill Factor Machined Coil

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3073
Author(s):  
Soo-Hwan Park ◽  
Eui-Chun Lee ◽  
Gi-Ju Lee ◽  
Soon-O. Kwon ◽  
Myung-Seop Lim
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
Permanent Magnet Synchronous Motor ◽  
Proximity Effects ◽  
Permanent Magnet Synchronous Motors ◽  
Design Guideline ◽  
Synchronous Motors ◽  
High Frequencies ◽  
Leakage Flux ◽  
Outer Rotor

This paper proposes a design guideline for selecting the pole and slot combination of an outer-rotor permanent magnet synchronous motor (PMSM) using a maximum slot occupation (MSO) coil. Because the MSO coil has a large conductor area, the AC Joule loss in the conductors may be increased at high frequencies. To ensure high-efficiency for the PMSM, it is necessary to reduce the loss. Thus, it is important to select the pole- and slot- combination that has the minimum AC Joule loss. The loss is caused by skin/proximity effects and variations in the slot leakage flux. The skin effect is due to the armature winding and the variation in the slot leakage flux is due to the field flux. A method for separating the AC Joule loss due to each component using the frozen permeability method is proposed. Based on the proposed method, the effect of each cause on the loss at various pole- and slot- combinations is analyzed in this study.

Research on Vector Control and PWM Technique of Six-Phase PMSM

2012 ◽  
Vol 516-517 ◽  
pp. 1626-1631
Author(s):  
Jian Yong Su ◽  
Jin Bo Yang ◽  
Gui Jie Yang
Keyword(s):  
Energy Conversion ◽  
Vector Control ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Permanent Magnet Synchronous Motor ◽  
Mathematic Model ◽  
Voltage Source ◽  
Current Harmonics ◽  
Electromechanical Energy Conversion ◽  
Electromechanical Energy

The mathematic model that based on decoupling vector space for six-phase permanent magnet synchronous motor (PMSM) is established. The six-phase PMSM is designed with two sets of Y-connected windings phase shifted by 30 electrical degrees. In the model, the variables of the motor are mapped to the α-β subspace associated with the electromechanical energy conversion and z1-z2 o1-o2 subspace that has nothing to do with the energy conversion subspace in the model. The model implies that different current harmonics have different effects on electromechanical energy conversion. The vector control scheme for six-phase PMSM is presented, in which the currents in the subspace α-β and z1-z2 are controlled in closed loop. A space vector pulse width modulation (SVPWM) algorithm of six-phase voltage-source inverter based on adjacent four largest voltage vectors is discussed. The voltage in α-β and z1-z2 can be modulated simultaneously. Through the simulation and experiment analysis, the vector control method and PWM technique for six-phase PMSM are proved to be feasible and effective.

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