A Neutral-Point Diode-Clamped Converter With Inherent Voltage-Boosting for a Four-Phase SRM Drive

The power density enhancement of a four‐phase switched reluctance motor using rotor conducting screens and DC‐link voltage boosting for electric vehicle applications is studied. The effect of conducting screen thickness and material electrical conductivity on current rise time, developed torque, and output power is studied. Different screen shapes are compared that elicit the optimum screen design by formulating a multi‐objective optimisation problem based on maximising the developed torque and efficiency and minimising added material weight. A double arm common switch converter with a DC‐link voltage‐boosting capacitors is deployed. The boosted voltage provided by the capacitors aids the winding current to rapidly build‐up; thus, increasing the motor base speed, whence power rating. Finite element analysis results confirm the SRM drive's effectiveness in increasing the motor base speed and improving the torque range; hence make the power capability of SRMs to be competitive with an equivalent volume permanent magnet synchronous motor.

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“…Details of the braking operation of the circuit are outlined in Ref. [24].…”

Section: Converter Operationmentioning

confidence: 99%

“…In Refs. [23] and [24], the problem of phase current overlap in a four‐phase SRM was resolved using a double arm topology with two boost capacitors, one for each arm. Above the improved base‐speed, the current is limited by the ever‐increasing effective back EMF.…”

Section: Introductionmentioning

confidence: 99%

SRM power density improvement utilising rotor conducting screens and DC‐link voltage boosting for EV applications

Abdel-Aziz

Ahmed

Massoud

et al. 2021

IET Electrical Syst in Trans

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“…Some derived topologies from the classical multilevel converters were also proposed. In [66], a NPC-AHB converter was proposed but with inherent dc-link voltage boosting capacitors. This topology was designed for the 8/6 SRM and it is characterized by the disconnection of the phases A and C with the phases B and D using power semiconductors (Figure 16a).…”

Section: Multilevel Convertersmentioning

confidence: 99%

A Review of the Power Converter Interfaces for Switched Reluctance Machines

Pires

Cordeiro

et al. 2020

Energies

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The use of power electronic converters is essential for the operation of Switched Reluctance Machines (SRMs). Many topologies and structures have been developed over the last years considering several specific applications for this kind of machine, improving the control strategies, performance range, fault-tolerant operation, among other aspects. Thus, due to the great importance of power electronic converters in such applications, this paper is focused on a detailed review of main structures and topologies for SRM drives. The proposed study is not limited to the classic two-level power converters topologies dedicated to the SRMs; it also presents a review about recent approaches, such as multilevel topologies and based on impedance source network. Moreover, this review is also focused on a new class of topologies associated to these machines, namely the ones with fault-tolerant capability. This new category of topologies has been a topic of research in recent years, being currently considered an area of great interest for future research work. An analysis, taking into consideration the main features of each structure and topology, was addressed in this review. A classification and comparison of the several structures and topologies for each kind of converter, considering modularity, boost capability, number of necessary switches and phases, integration in the machine design, control complexity, available voltage levels and fault-tolerant capability to different failure modes, is also presented. In this way, this review also includes a description of the presented solutions taking into consideration the reliability of the SRM drive.

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“…Within this context, the U.S. Department of Energy (DoE) proposes stringent technological targets with regard to power density, efficiency and costs for both motors and power converters [18]. Indeed, nowadays most SRM-related research focuses on machine structural improvements, control improvements (which affect machine performance), or new converter topologies [19]- [21].…”

Section: Introductionmentioning

confidence: 99%

Synchronized Switching Modulation to Reduce the DC-Link Current in SRM Drives

et al. 2020

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Switched Reluctance Machines (SRM) are emerging as a possible alternative in terms of cost and supply stability to rare earth based electric vehicle traction systems. However, because of the huge amounts of energy stored and transferred back and forth between the DC source and the SRM, large DC-link capacitors must be used as buffers, which increases overall costs and size. This paper proposes a novel modulation technique which forces the exchange of energy between phases while decreasing the energy transfer between the DC bus and the SRM. This means lower DC bus currents (capacitor size and cost reduction) and lower Joule-effect conduction losses (better efficiency). The proposed modulation has been validated experimentally in a test bench and compared with the conventional torque-sharing function. INDEX TERMS Switched reluctance motors, motor current control, inverter modulation, capacitor current reduction.

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A Neutral-Point Diode-Clamped Converter With Inherent Voltage-Boosting for a Four-Phase SRM Drive

Cited by 38 publications

References 34 publications

SRM power density improvement utilising rotor conducting screens and DC‐link voltage boosting for EV applications

SRM power density improvement utilising rotor conducting screens and DC‐link voltage boosting for EV applications

A Review of the Power Converter Interfaces for Switched Reluctance Machines

Synchronized Switching Modulation to Reduce the DC-Link Current in SRM Drives

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