MSPA motors for rotary motions

Abstract:
Modular Stepping Piezoelectric Actuators (MSPA) are inertial motors working under the stick-slip principle. The advantages of rotary MSPA are unlimited stroke, torque at rest, high resolution, nonmagnetic and vacuum compatibility. This paper presents the new MSPA developments regarding rotary motion at Cedrat Technologies for macro and micro sizes MSPA. These progresses follow the previous technical investigations around noise reduction, miniaturization at low voltage and the integration of MSPA modules. In this paper two rotary piezo motors are presented: The first one is a macro size MSPA based on APA40SM. It is developed to work under nuclear environment: operational temperature up to 70 degrees, vacuum, 5 Tesla magnetic field and high radiation fields (3,5 kGy/hour γ radiation power and 500 Mn/(cm2.second) neutron radiation power). The second is a micro size MSPA based on APA30uXS. This motor is used for embedded application such as nonmagnetic shutter.