Study on high efficiency and large mechanical output surface acoustic wave actuator

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We have found that several tens degrees of phase shift in an energy circulation drive SAW motor IDT will cause decrease of the circulation energy. So that we improve an simulation equivalent circuit model for IDT and investigated the IDT allocation method. As a result, we decided to change the arrangement of exciation IDT, two driving IDTs were separately arranged at near both end circulation uni-directional IDTs. For this purpose, precise modeling parameters are required to fit the actual device.The Rayleigh wave propagating beneath the slider is scattered by the projections on the slider surface. This phenomenon was simulated by using the FEM analysis. Due to the contact and take off of the slider projection from the stator causes the secondary wave source, so that a flat slider surface will be effective to reduce the scattering. For this, a flat surface slider with some design to reduce the squeeze film should be considered.