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MACHMINI Sintesi della relazione

Project ID: G1RD-CT-2001-00657
Finanziato nell'ambito di: FP5-GROWTH
Paese: United Kingdom

Low-frequency (5-50Hz) signal generator

A generator was designed and constructed to supply the Amplified Stacked Ceramic Multi-layer Actuator (ASCMA). The generator consists of the following sub-assemblies: voltage amplifier (20V/V) equipped with a voltmeter, supplier, modulator and the low power voltage source (0-10VDC).

The output voltage of the amplifier is 0-200V and the operating frequency is between 5~50Hz. The maximum output voltage 200VDC, with a stable range of ±0.5%, would produce a free stroke of the ASCMA of 0.5mm; stroke is proportional to the supplied voltage; the stroke/voltage characteristic is approximately linear. The frequency in the range 5~50Hz can be used for quasi-static applications; however, it is also possible to use the ASCMA for static applications; in this latter case, the supply of a sinusoidal voltage to the actuator is terminated to allow the device to be operated as a translating device.

The main parameters of the generator (the output voltage and frequency) may be adjusted. The frequency is set manually using the built-in potentiometer. The output voltage (the ASCMA stroke) may be adjusted either manually or automatically. For the former case, a voltage-supply unit, equipped with a potentiometer, would have to be connected to the generator. In circumstances when the operation has to be automated, a specially-designed intermediate unit, of the type used for the ultrasonic generator, would have to be connected to the forming machine and the generator. This unit enables the adjustment of the output voltage (the ASCMA stroke) using the control system designed for the MACHMINI machine.


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