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131 results on '"Vansompel, Hendrik"'

1. Multi‐agent voltage balancing in modular motor drives with series‐connected power electronic converters.

Author

Verkroost, Lynn, Vande Ghinste, Alexander, Vanthuyne, Karel, Van Damme, Jordi, De Belie, Frederik, Sergeant, Peter, and Vansompel, Hendrik

Subjects
MOTOR drives (Electric motors), ELECTRONIC equipment, VOLTAGE, MULTIAGENT systems, IDEAL sources (Electric circuits), DYNAMIC balance (Mechanics)
Abstract

Modular motor drives can be considered as multi‐agent systems, in which the agents can work together to reach a common goal. One agent in such a modular motor drive consists of only a subset of the machine phases and power electronic converter modules, and is equipped with a dedicated controller. When the dc‐links of the different agents are connected in series to a single voltage source, giving rise to a so‐called stacked polyphase bridges converter, the power electronic converter components can have low voltage ratings. However, a voltage balancing controller must ensure that the total dc‐link voltage is distributed evenly among the agents when working in motoring mode. The goal of this research is to propose a multi‐agent voltage balancing algorithm based on dynamic average consensus, which depends solely on local computations, local measurements, and neighbour‐to‐neighbour communication. The scalability and reliability of the modular hardware are hence extended towards the control. Simulations and experimental results on a 4 kW modular axial‐flux PMSM demonstrate the feasibility of the concept. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Dynamic multi‐agent dc‐bus reconfiguration in modular motor drives with a stacked polyphase bridge converter.

Author

Verkroost, Lynn, Vande Ghinste, Alexander, da Rocha, Lorrana Faria, De Kooning, Jeroen D. M., De Belie, Frederik, Sergeant, Peter, Olsen, Pål Keim, and Vansompel, Hendrik

Subjects
MOTOR drives (Electric motors), SEMICONDUCTOR switches, IDEAL sources (Electric circuits), FAULT tolerance (Engineering), ELECTRIC current rectifiers, ALTERNATING current electric motors, WHEATSTONE bridge
Abstract

A stacked polyphase bridge converter consists of multiple standard, three‐phase two‐level voltage source inverters connected in series to the same dc voltage source. The authors present a decentralised and dynamic dc‐bus reconfiguration strategy for this type of converter. The innovation of the proposed strategy lies in its ability to isolate or reactivate one of the inverters in the series connection online, even in motoring mode, enabling increased fault tolerance and an extended speed range. Both the required hardware alterations and the multi‐agent control strategy are addressed. Its major benefits compared to the state‐of‐the‐art are that only two additional active, unidirectional semiconductor switches are required per inverter, and that the control is based on local computations, local measurements and neighbour‐to‐neighbour communication only. Hence, the scalability and reliability of the hardware are extended towards the control. Simulations and experimental results on a 4 kW modular axial‐flux PMSM prove the feasibility of the concept, and validate that the dc‐bus can be reconfigured in 100 ms, without torque interruption. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Comparison of drivetrain topologies : an ankle gait cycle

Author

Joos, Yentl, Sergeant, Peter, Vansompel, Hendrik, and Verstraten, Tom

Subjects
Technology and Engineering
Abstract

Electric actuation is used in a wide variety of applications and fields. One of the fields is prosthesis actuation where energy efficiency and mass are important characteristics. A lot of applications within this field (e.g. knee prosthesis, ankle prosthesis,...) require a high torque at low speed and a low torque at high speed. These motion requirements are difficult to effectively combine into a single electric motor. A possibility is to use an oversized direct–drive motor that can deliver the peak torque. However, this results in a heavy actuation system and low overall efficiency. A common practice is combining a smaller electric motor with a gear reduction system. In literature, novel redundant electric actuation systems were presented with or without locking mechanisms. In this work, multiple electrical actuation systems composed of electric motors, gear reduction systems and locking mechanisms are compared to each other. This is done using the gait cycle of a human ankle as a case study.

Published
2022

15. Anodised aluminium foil winding axial flux machine for high torque density robot actuators

Author

Van Damme, Jordi, Vansompel, Hendrik, and Crevecoeur, Guillaume

Subjects
Technology and Engineering
Abstract

There is a need for higher torque density electric actuators in novel (quasi-)direct-drive robotic applications. Since the torque density is inherently limited by material properties, designers have to look at novel materials to push the torque density limit further. In this work, anodised aluminium foil is considered as an alternative to enamelled copper wire in a yokeless and segmented armature axial flux machine. This machine topology has a high torque density and is particularly suited for an anodised aluminium foil winding. The DC resistance, thermal properties and eventually the torque density of a prototype test case machine are compared for both winding materials. A 3D thermal finite element model is used to analyse the influence of the thermal interface between winding body and housing, and the influence of the cooling performance on the torque density. This has shown that the use of anodised aluminium foil can increase the torque density up to 37%. To conclude, anodised aluminium foil winding offers a higher torque density in direct-drive yokeless and segmented armature axial flux actuators where the winding body thermal resistance is dominant in the thermal path from heat source to heat sink. It is experimentally shown that for the prototype machine, the torque per kg active stator mass increases 13% through the use of anodised aluminium foil.

Published
2022

16. Comparison of Drivetrain Topologies for an Ankle Gait Cycle.

Author

Joos, Yentl, Sergeant, Peter, Vansompel, Hendrik, and Verstraten, Tom

Subjects
AUTOMOBILE power trains, ANKLE, ELECTRIC motors, GAIT in humans, PERMANENT magnet motors, MULTIPLE comparisons (Statistics), ENERGY dissipation
Abstract

Powered prosthesis actuation is a field where energy efficiency and mass are important characteristics. The motion requirements of high torque at low speed and low torque at high speed are difficult to effectively combine in a single electric motor. A possibility is to use an oversized direct–drive motor that can deliver the peak torque. However, this results in a heavy actuation system and low overall efficiency. A common practice is combining a smaller electric motor with a gear reduction system. In the literature, novel redundant electric actuation systems have been presented with or without locking mechanisms to mitigate this problem. In this work, we provide a comparison of multiple electrical actuation systems composed of electric motors, gear reduction systems and locking mechanisms. This is done using the gait cycle of a human ankle as a case study. An electric motor with a double stator and a single rotor combined with a gearbox shows the most promising overall results when taking energy loss, total mass and complexity of the system into account. [ABSTRACT FROM AUTHOR]

Published
2023
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