Figure 10 - uploaded by Andrey V. Brazhnikov
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Design version of the stator of a 6-phase flat type AC linear motor and winding connections, where FC is a 6- phase frequency converter, S is the motor stator, W is phase multiple-turn winding of the motor stator, and DS is diamagnetic shield.
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The study of AC inverter drives in the case when the number of their phases is more than four allows to find out some basic laws of these systems which does not manifest themselves when the phase number is equal to three or four. Two previously unknown laws of energy efficiency invariance are established in the field of multiphase (i.e. having the...
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Citations
... According to this deduction the following three basic design versions were developed by the author of this paper: Basic design version 1 (BDV-1). The AC motor stator winding set consists of the individual rods located in stator slots and insulated from stator magnetic circuit[29](Figures 5, 6, and 7). Basic design version 2 (BDV-2). ...
The study of AC inverter drives in the case when the number of their phases is more than four allows to find out some basic laws of these systems which does not manifest themselves when the phase number is equal to three or four. Two previously unknown laws of energy efficiency invariance are established in the field of multiphase (i.e. having the number of phases more than four) AC inverter drives. These laws ignoring leads necessarily to the decrease of the multiphase drive system energy efficiency.
... Because of this it is necessary to use some peculiar designs of multiphase AC liner and non-linear motors to ensure fulfillment of the H-invariance law [2,5,6]. ...
... The application of any one of these design versions allows to achieve the fulfillment of the H-invariance law [2,5,6]. ...
The prospects for the use of multiphase (i.e. having the number of phases more than four) asynchronous linear and non-linear drives in the field of vehicles were presented and described in a number of papers. However the increase of the phase number of asynchronous electric drive system allows not only to improve a number of its technical-and-economic characteristics, but also to create the hybrid traction drives according to scheme “AC Diesel-generator - Commutator - AC induction motor(s)” which will differ fundamentally from the existing ones, and have more simple design and less energy losses (in comparison with analogous existing hybrid drives). These AC hybrid traction drives of novel type are based on the use of the multiphase Diesel generators and non-traditional controlled multiphase induction motors.
... It is obviously that the fulfillment of these conditions (i.e. the above mentioned law of Hinvariance ) may be provided only with obtaining the conductive decoupling between the AC motor stator slots, which cannot be achieved if design of the motor and its stator winding set are traditional. Because of this it is necessary to use some peculiar designs of multiphase AC liner and non-linear motors to ensure fulfillment of the H-invariance law [6, 7] According to this deduction the following a number of three basic design versions were developed by the authors of this paper: ...
... The application of any one of these design versions allows to achieve the fulfillment of the H-invariance law [6, 7]. The design of multiphase induction motor of rotating type worked out according to the basic design version BDV-1 is shown in section inFigure 10. ...
The increase of the phase number of asynchronous electric drive system of vehicles allows not only to improve a number of its technical-and-economic characteristics, but also to create the hybrid traction drives according to scheme “AC Diesel-generator – Commutator – AC induction motor(s)” which will differ fundamentally from the existing ones, and have more simple design and less energy losses (in comparison with analogous existing hybrid drives). These AC hybrid traction drives of novel type are based on the use of the multiphase Diesel generators and non-traditional controlled multiphase induction motors.
... Design Peculiarities of the Multiphase PPM-Controlled Induction Motor are described in a number of papers of the authors of this work (for example, in [2][4], etc.). ...
... Design Peculiarities of the Multiphase PPM-Controlled Induction Motor are described in a number of papers of the authors of this work (for example, in [4], etc.). ...
The prospects for the use of multiphase (i.e. having the number of phases more than four) asynchronous linear and non-linear drives in the field of vehicles were presented and described in a number of papers. However the increase of the phase number of asynchronous electric drive system allows not only to improve a number of its technical-and-economic characteristics, but also to create the hybrid traction drives according to scheme “AC Diesel-generator – Commutator – AC induction motor(s)” which will differ fundamentally from the existing ones, and have more simple design and less energy losses (in comparison with analogous existing hybrid drives). These AC hybrid traction drives of novel type are based on the use of the multiphase Diesel generators and non-traditional controlled multiphase induction motors.
... Besides, the necessity of the PPM use causes the application of the peculiar versions of EMET designs [13, 15, 16, 19]. The design of multiphase induction motor of rotating type worked out according to one of the above mentioned version is shown in section inFig. ...
New principles of design and control strategy for creation of fault tolerant inverter-fed electromechanical systems (such as inverter-fed AC motor drives, molten metals electromagnetic stirring systems, etc.) have worked out by the authors of this paper. This strategy is based on the use of the phase-pole method (PPM) of control of an inverter and electromechanical energy transformer (EMET; for example, an induction motor). The application of worked out principles allows to develop the above mentioned type electromechanical systems having high reliability (strictly speaking, post-fault vitality) and less EMET mass-and-overall dimensions than existing ones.
... The results of researches received by the authors of this paper show that the use of the multiphase (i.e. having the number of phases m > 4) inverter-fed induction motors in these traction systems is the most effective way of solving the above mentioned problems because multiphase inverter-fed asynchronous drives have better technicaland-economic characteristics and potentials for their further improvement than the 3-phase ones [19][20][21][22][23][24][25][26][27][28][29][30][31]. ...
... The increase of the phase number m more than four allows not only to improve a number of technical-and-economic characteristics of the inverter-fed linear and non-linear induction motors [1][2][3][4][6][7][8][9][10]19], but also to open the way for the design of the electrical drives having radically new properties and possibilities. It is conditioned by the possibility for the use of some non-traditional motor control methods in the induction drive system which appears when m5 [20][21][22][23][24][25][26][27]29,30]. These non-traditional control methods cannot in principle be used when the inverter-fed linear motor phase number is equal to three or four. ...
... having the phase number m5) induction motor drives. Some properties and peculiarities of OPM were presented [20][21][22][23][24][25][26][27][28][29][30]. ...
At present among the most important problems in the field of traction systems of railway vehicles are the following: 1) the minimization of the mass-and-overall dimensions of the drive systems; 2) the increase of the drive systems reliability and obtaining their higher fault-tolerance abilities; 3) the minimization of the motion speed pulsations and its oscillations, etc. The results of the researches received by the authors of this paper show that the use of the multiphase (i.e. having the number of phases more than four) nverter-fed induction motors in these traction systems is the most effective way of solving the above mentioned problems. In this case the motion speed oscillations can be decreased only by the increase of the drive phase number without any change in the inverter control algorithm. In addition, the application of some non-traditional control methods in the multiphase asynchronous traction drive system of a railway vehicle
allows to decrease the mass-and-overall dimensions of the system and to improve its reliability and some other technicaland economic characteristics
The study of AC inverter drives in the case when the number of their phases is more than four allows to find out some basic laws of these systems which does not manifest themselves when the phase number is equal to three or four. Two previously unknown laws of energy efficiency invariance are established in the field of multiphase (i.e. having the number of phases more than four) AC inverter drives. These laws ignoring leads necessarily to the decrease of the multiphase drive system energy efficiency.
An iterative virtual channel receiver using Turbo codes is proposed in this paper. The receiver can detect signals even when the number of the signal streams exceeds the number of the receive antennas. We show that SISO detection can improve the BER performance compared to when the hard detection is used. Moreover, it is shown that it is better to use the same phase pattern in calculating LLRs of the phase elements.
