Control and sensor techniques for PAD servo motor drive

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The Piezoelectric Actuator Drive (PAD) is a new type of electrical motor that employs piezoelectric multilayer actuators coupled with a form-fitted micro-mechanical gearing to generate rotary motion. The PAD is precise, having a positioning error of less than 2 arc-seconds. Its typical output torque is 4 Nm, without any additional gearing. The whole motor is fully non-magnetic, enabling its use in applications where magnetic neutrality is of importance. The main challenges of the PAD are the hysteretic behavior of the ceramic actuators used and their highly capacitive nature. After compensating for the hysteretic behavior, the current waveforms of the motor can be used to extract all necessary parameters for sensorless operation. Moreover, these signals provide a qualitative information about the precision in motor centering and show any mismatch between the actuators used.
Original languageEnglish
Title of host publicationProceedings of the 50th International Universities Power Engineering Conference
Number of pages5
Publication date2015
Publication statusPublished - 2015
Event50th International Universities Power Engineering Conference - Staffordshire University, Staffordshire, United Kingdom
Duration: 1 Sep 20154 Sep 2015
Conference number: 50


Conference50th International Universities Power Engineering Conference
LocationStaffordshire University
Country/TerritoryUnited Kingdom
Internet address


  • Piezoelectricity
  • Multilayer actuator
  • Motor
  • Hysteresis
  • Compensation
  • Control


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