Fault-tolerant permanent magnet machine drives

Mecrow, B.C.; Jack, A.G.; Haylock, J.A.; Coles, J.

doi:10.1049/ip-epa:19960796

Cited by 316 publications

(122 citation statements)

References 1 publication

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“…Recently, it has been shown that the conditions for optimal flux weakening can be achieved in an SPM by using fractional-slot pitch concentrated windings (FSPCW) [8,9]. It has also been shown that using FSPCW along with a higher number of phases helps in making an SPM machine more fault-tolerant [10].…”

Section: Introductionmentioning

confidence: 99%

Eddy Current Loss Minimization in Conducting Sleeves of High Speed Machine Rotors by Optimal Axial Segmentation and Copper Cladding

Shah

El-Refaie

2007

2007 IEEE Industry Applications Annual Meeting

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When a non-magnetic, high-strength metallic retaining sleeve offers advantages over a non-metallic (e.g. carbon fiber) one, it is possible to consider the application of a high conductivity shield "coating" on this sleeve to reduce the surface eddy current losses due to non-synchronous fields. One can start by using a Maxwell's equations based analytical model to "screen" for the optimal shield thickness and then employs a "2.5D" FE method that accounts for periodic fields and finite rotor length including axial segmentation and/or copper cladding. These are quantified to help design a low loss rotor sleeve for a high speed SPM machine with fractional-slot concentrated armature winding. With this type of windings the sleeve losses can be significant due to its rich asynchronous harmonic armature reaction mmf content.

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Section: Introductionmentioning

confidence: 99%

Eddy Current Loss Minimization in Conducting Sleeves of High Speed Machine Rotors by Optimal Axial Segmentation and Copper Cladding

Shah

El-Refaie

2007

2007 IEEE Industry Applications Annual Meeting

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“…Studies of short circuit faults in PM machine were presented in [1,2]. Fault tolerant permanent machines and their operation under various open-circuit fault conditions were presented in [3] and [4]. Fault tolerant control of a PM machine with high winding inductances was reported in [5].…”

Section: Introductionmentioning

confidence: 99%

Disturbance Free Operation of Permanent Magnet Motor Drives Under Short Circuit Faults Using Center-Split Winding

Dwari

Parsa

2007

2007 IEEE Industry Applications Annual Meeting

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This paper studies permanent magnet (PM) motor drives with centre-split stator windings and auxiliary switches. By proper control algorithm, the proposed configuration guarantees continuous operation under various short-circuit conditions. Each of the stator phases is split at the center into two windings having equal number of turns and a common magnetic axis. Auxiliary switches are used to break the fault current path or to isolate the faulty winding. Under short-circuit fault condition; the current in the healthy half of the phase winding is controlled to cancel the rotor magnetic flux linkage of the shorted turns in the faulty half of the winding belonging to the same phase. This diminishes the detrimental fault currents in the shorted turns and allows the drive to continue operation under faulty condition. The currents in the healthy phases are controlled properly to generate the desired output torque. In this work, an optimal fault-tolerant control method is presented for controlling the healthy phase currents of a general n phase machine. Simulation results of a five phase PM machine are presented for verification of the proposed strategy.

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“…Multiphase machines with more than three phases can be then considered [3,4]. Even if a higher number of connections is not well adapted for the reliability, these drives are interesting because of their fault-tolerant capability: they can continue to run even with one or two open-circuited phases.…”

Section: Introductionmentioning

confidence: 99%

Fault tolerant multiphase electrical drives: the impact of design

Semail

Kestelyn

Locment

2008

Eur. Phys. J. Appl. Phys.

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Abstract. This paper deals with fault tolerant multiphase electrical drives. The quality of the torque of a vector-controlled Permanent Magnet (PM) Synchronous Machine supplied by a multi-leg Voltage Source Inverter (VSI) is examined in normal operation and when one or two phases are open-circuited. It is then deduced that a seven-phase machine is a good compromise allowing high torque-to-volume density and easy control with smooth torque in fault operation. Experimental results confirm the predicted characteristics.

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Fault-tolerant permanent magnet machine drives

Cited by 316 publications

References 1 publication

Eddy Current Loss Minimization in Conducting Sleeves of High Speed Machine Rotors by Optimal Axial Segmentation and Copper Cladding

Eddy Current Loss Minimization in Conducting Sleeves of High Speed Machine Rotors by Optimal Axial Segmentation and Copper Cladding

Disturbance Free Operation of Permanent Magnet Motor Drives Under Short Circuit Faults Using Center-Split Winding

Fault tolerant multiphase electrical drives: the impact of design

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