Rayner, P J*; Wilson, S A*; Whatmore, R W*; Cain, M G (2008) A simple technique for automated performance testing of piezoelectric micro-motors by transient motion analysis. Sens. Actuators A, Phys., 144 (1). pp. 130-134.

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Abstract

The performance of micro-scale piezoelectric motors is characterised primarily in terms of their torque, speed and efficiency. In order to be meaningful these parameters must be measured concurrently and an effective test system is therefore essential for design, development, device optimisation and assessment of reliability. At the micro-scale, conventional methods of testing rotary motors, such as pulley brakes, are not easy to implement due to size constraints and also to the difficulty of measuring very small dynamic forces.
An automated method of testing a 5mm diameter flextensional ultrasonic motor has been created which derives performance measurements from the transient start up and stopping behaviour of the motor using a simple non-contact position encoder. The method gives full performance characteristics in less than a second and it is scaleable for use with other sizes and other types of motor. Furthermore it provides a generic technique for non-contact measurements of position, angle or velocity that can be rapidly cycled as part of a development programme.
The method has shown sufficient sensitivity, using basic components, to measure torque in the range 10-200µNm and speed in the range from 0 to over 2000rpm. The torque and speed ranges are only dependant on the sensitivity of encoder instrumentation, inertial load on the motor and data acquisition. This system is believed to be a significant improvement over previously reported work that has detailed friction brake or manual 'one-off' systems and the test format has greater applicability for micro-motors that are used for their positioning capabilities

Item Type:	Article
Keywords:	piezoelectric, metrology, micromotor
Subjects:	Advanced Materials Advanced Materials > Functional Materials
Last Modified:	02 Feb 2018 13:15
URI:	http://eprintspublications.npl.co.uk/id/eprint/4321

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