Design of asynchronous dielectric micromotors

Abstract This paper compares asynchronously and synchronously driven dielectric micromotors. The following advantages of an asynchronous motor are discussed. (i) Flexibility of the micromotor geometry. (ii) Simple design which allows for operation of rotors in electrolyte solutions (e.g. water) that may be pumped in this way. (iii) Opportunity to use negative dielectrophoretic forces to stabilise the rotors. To predict some properties of dielectric motors we have modelled their rotors geometrically as ellipsoids. This model is consistent with the experimental results and shows that motor operation is a complex function of geometry, driving frequency and material properties. Although the general motor characteristics (torque's) of asynchronously and synchronously driven motors are quite similar both motor types are sufficiently different in detail. Therefore, it is worth to design motors using special properties of the asynchronous principle.

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