The Fault-Tolerant Quad-Channel Brushless Direct Current Motor

In this study, a permanent magnet brushless direct current machine with multi-phase windings is proposed for critical drive systems. We have named the solution, which has four-stator winding, a quad-channel permanent magnet brushless direct current (QCBLDC) motor. The stator windings are supplied by four independent power converters under quad-channel operation (QCO) mode. After a fault in either one, two, or three channels, further operation of the machine can be continued in triple-channel operation (TCO) mode, dual-channel operation (DCO) mode, or single-channel operation (SCO) mode. In this paper, a novel mathematical model is proposed for a QCBLDC machine. This model takes into account the nonlinearity of a magnetic circuit and all of the couplings between the phases within a given channel, as well as between channels. Based on numerical calculations, the static electromagnetic moment and the coupled fluxes were determined for the individual windings of the variants and work modes being analyzed. A normal work condition can be achieved in the QCO or DCO modes. For the DCO mode, an acceptable case uses a balanced magnetic pull (A and C channels supplied). The DCO A and B type work mode is comparable to the DCO A and C mode with regard to its efficiency in processing electrical energy. The vibroacoustic parameters of this mode, however, are much worse. In fault states, TCO, DCO, and SCO work modes are possible. As the number of active channels decreases, the efficiency of energy processing also decreases. In a critical situation, the motor works in overload mode (SCO mode). Laboratory tests conducted for one of the variants demonstrated that the TCO work mode is characterized by worse vibroacoustic parameters than the DCO A and C mode.

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Comparative Analysis of Fault-Tolerant Dual-Channel BLDC and SR Motors

Energies ◽

10.3390/en12132489 ◽

2019 ◽

Vol 12 (13) ◽

pp. 2489

Author(s):

M. Korkosz ◽

P. Bogusz ◽

J. Prokop ◽

B. Pakla ◽

G. Podskarbi

Keyword(s):

Comparative Analysis ◽

Direct Current ◽

Permanent Magnets ◽

Single Channel ◽

Fault Tolerant ◽

Operating Conditions ◽

Switched Reluctance ◽

Dual Channel ◽

Reluctance Motor ◽

Two Machines

This article presents the results of a comparative analysis of two electronically commutated brushless direct current machines intended for fault-tolerant drives. Two machines designed by the authors were compared: a 12/14 dual-channel brushless direct current motor (DCBLDCM) with permanent magnets and a 12/8 dual-channel switched reluctance motor (DCSRM). Information is provided here on the winding configuration, the parameters, and the power converters of both machines. We developed mathematical models of the DCBLDCM and DCSRM which accounted for the nonlinearity of their magnetization characteristics in dual-channel operation (DCO) and single-channel operation (SCO) modes. The static torque characteristics and flux characteristics of both machines were compared for operation in DCO and SCO modes. The waveforms of the current and the electromagnetic torque are presented for DCO and SCO operating conditions. For DCO mode, an analysis of the behavior of both machines under fault conditions (i.e., asymmetrical control, shorted coil, and open phase) was performed. The two designs were compared, and their strengths and weaknesses were indicated.

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A comparative study of permanent magnet - synchronous and permanent magnet - flux switching machines for fault tolerant drive systems

2010 IEEE Energy Conversion Congress and Exposition ◽

10.1109/ecce.2010.5617941 ◽

2010 ◽

Cited By ~ 12

Author(s):

Tsarafidy Raminosoa ◽

Chris Gerada

Keyword(s):

Comparative Study ◽

Permanent Magnet ◽

Fault Tolerant ◽

Drive Systems

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The method for constructing fault-tolerant photonic switches for high-performance computing systems

Journal of Physics Conference Series ◽

10.1088/1742-6596/2091/1/012032 ◽

2021 ◽

Vol 2091 (1) ◽

pp. 012032

Author(s):

E A Barabanova ◽

K A Vytovtov ◽

V M Vishnevsky ◽

V S Podlazov

Keyword(s):

High Performance ◽

Single Channel ◽

Fault Tolerant ◽

Switch Architecture ◽

Dual Channel ◽

Photonic Switches ◽

Mathematical Expressions ◽

Photonic Switch ◽

New Type ◽

First Time

Abstract In this paper the new type of fault-tolerant non-blocking photonic switch is presented for the first time. The proposed switch architecture is based on quasi-complete graph topology which use provides non-blocking and fault-tolerant switching process. The new two-stage switch architecture uses the stage of dual photonic switches and pairs of photonic demultiplexers and multiplexers which have been described in detail by authors in their previous works. Depending on the number of different backup connections, the two types of fault-tolerant pho-tonic switches are considered in this paper: single-channel fault-tolerant photonic switch and dual-channel fault-tolerant photonic switch. The mathematical expressions for calculating the switching and fiber complexities of these two types of fault-tolerant photonic switches are also presented here for the first time. The numerical calculations shown that the increasing the reliability of the fault-tolerant photonic switches twice leads to an increasing their switching complexity in 1.4 times and fiber complexity in 1.8 times.

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