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Modelling the air-gap field strength of electric machines to improve performance of haptic mechanisms

Harwin, W. S. (2018) Modelling the air-gap field strength of electric machines to improve performance of haptic mechanisms. In: EuroHaptics 2018: Haptics: Science, Technology, and Applications, 13-17 June, Pisa, Italy, pp. 94-105.

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The air-gap of electro-magnetic (EM) actuators determines key operating parameters such as their ability to generate force. In haptic devices these parameters are not optimised for the conditions typically seen in operation and include the heat produced in the air-gap, the volume of the air-gap, and the intensity and direction of the magnetic field. The relationship between these parameters is complex thus design decisions are difficult to make. This paper considers the role of the radial magnetic field in cylindrical electric motors, a type often used in haptic devices. Two models are derived and compared with experimental measurements. The first model is a closed form solution, the second is a classic Poisson solution to Ampere's equation. These models are shown to be valid for making more general design decisions in relation to haptic actuators, and in particular allow an evaluation of the trade off between the volume of the air-gap, the resulting radial magnetic field and hence heat generated and the resulting forces.

Item Type:Conference or Workshop Item (Paper)
Divisions:Life Sciences > School of Biological Sciences > Department of Bio-Engineering
ID Code:77507
Additional Information:Part of the Lecture Notes in Computer Science book series (LNCS, volume 10894).


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