隨著電子元件小型化的發展、以及奈米科技的推波助瀾下，微型馬達-尤其超音波馬達的發展越來越重要。然而驅動超音波馬達需要極高的輸入電壓，本研究利用壓電變壓器來提升輸入電壓並驅動超音波馬達。為了探討壓電變壓器以及超音波馬達連結特性，本研究建立壓電變壓器與超音波馬達系統完整動態方塊圖，模擬其連結時的工作頻率偏移及放大倍率。模擬分析的結果與實驗量測的結果做比較，以驗證理論模型之正確性，模擬與實驗結果相當吻合，足以說明本文中理論分析的可靠性。最後本研究成功使用壓電變壓器驅動超音波馬達，也利用比例控制器實現壓電變壓器連結超音波馬達之定位控制。

Ultrasonic motors are usually operated at a higher AC voltage than conventional function generators. This implies the need of a voltage step-up transformer. In this paper, a piezoelectric transformer is integrated with a USM. However, when a PT and a USM are combined, the PT’s resonance frequency shifts. This paper aims to provide an alternative method to determine the characteristics of a PT and a USM from measurement. A block diagram approach is conducted to analyze the dynamic characteristics of the PT and the USM at their resonance frequencies; thus, the frequency shift and gain of the PT when combined the USM can be easily calculated. The experimental results demonstrate the effectiveness of the proposed method. Finally, we use a proportional control algorithm to realize the PT-USM positioning control.

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