Specific design rules for micro linear motors

Demmig, S.; Gehrking, R.; Feldmann, M.; Büttgenbach, S.; Ponick, Bernd

doi:10.1109/speedam.2006.1649797

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…It can be seen that the force in horizontal direction decreases only slowly with increasing vertical displacement, whereas the lifting force increases significantly. Source: Demmig et al (2006) Electrical machines…”

Section: Current Density and Temperaturementioning

confidence: 99%

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Miniaturisation of electrical machines

Ponick

2011

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose-Approaches for a miniaturisation of electrical machines that are based on an electromagnetic principle have to overcome numerous challenges. Some of these are only a result of the rules of growth (or shrinkage), some are a result of the micro technological fabrication processes. This paper aims to give an overview of the current state of the art including various examples of linear and rotating micro actuators that have been realised. Design/methodology/approach-The paper presents details of further miniaturisation by using thin film technology for depositing and structuring soft magnetic and hard magnetic material as well as copper for conductors and insulation. Findings-There are numerous limitations for the miniaturisation with respect to material properties, friction/guidance, etc. and this paper illustrates ways to overcome these limitations. Originality/value-The paper presents a compact overview on the achievements gained in 12 years of research within a collaborative research centre of the German DFG.

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Section: Current Density and Temperaturementioning

confidence: 99%

“…Basic principle of a linear micro switched reluctance motor with horizontal flux Traveller Source:Demmig et al (2006) …”

mentioning

confidence: 99%

Miniaturisation of electrical machines

Ponick

2011

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Investigations on a Micro Linear Stepping Motor Supplied by a DC-DC Converter

Gehrking

Demmig

Mertens

et al. 2007

2007 IEEE International Electric Machines &Amp; Drives Conference

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This paper reports on a micro linear stepping employed materials that must be considered in the design of motor which is supplied by a dc-dc converter. The micro linear such micro motors. In this respect, the flexibility ofthe layout motor is built up by using micro fabrication techniques like is strongly limited. For example, the permeability of the used sputtering, UV depth lithography and electroplating [1, 2, 3]. In soft magnetic materials strongly depends on the layer height. order to adjust the stator current, an adapted drive has been This must be considered in the design of the soft magnetic developed. Due to the very small inductances of the motor coils, the chosen dc-dc converter works with a switching frequency of flux guides [6]. more than 1 MHz. Nevertheless, the current is not constant at Furthermore, the guidance of such micro linear motors is a all, because the time constant of the stator winding is only challenge. The Maxwell normal forces between stator and 100 ns. The effects due to the harmonics of the voltage supply traveller of uncompensated linear motors, which can exceed will be considered and analysed by using transient finite element the driving force by a factor of 10, cause friction forces method simulations. Therefore, a FEM model of the motor for (depending on the quality of the guidance), which can transient analysis has been developed and the losses have been considerably affect the functionality of the motor. A solution calculated. It could be shown that the additional motor losses to reduce the high friction forces is the concept of the due to eddy currents, skin effect and current displacement are reluctance motor with horizontal flux guidance with negligible. But it has to be taken into account that the increase of the r.m.s. value of the current caused by the current ripples compense Mmaa results in higher copper loss having a constant mean value of the guidance [7]. current. III. THE HORIZONTAL MOTOR

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