You can also use a piezo with DC voltage, which is what we are aiming at here.
Piezo positioners have been around for a couple of decades, (e.g. atomic resolution microscopes) and make use of direct coupled amplifiers with exactly the capability you are looking for. You can buy one off the shelf.
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The problem is that it is a Piezo and it will break down under a constant DC Voltage.
It does need an Alternating wave form of some description not necessarily a sin wave, it could be a short ramp or PWM which will control the current, but as jim-p pointed out a known design would be best.
No. See post #22. And, of course the data sheet for the device under discussion, linked in the OP.
Actually the data sheet as you put it has Specified 1 V RMS a 1KHz for its tests and nowhere on that data sheet does it state DC. Further to this it specifies resonant and ant-resonant frequencies, which of course is AC.
As far as your link to Amplifiers Actuators etc., you should read the spec. These are AC devices which are specified to have 150V peak to peak.
As far as I am aware, you certainly do not need bandwidth figures for a DC device.
- Output Voltage -30 V to +150 V
- Output Current: 100 mA per channel
- Signal Bandwidth: 180 kHz
- Power Bandwidth: 80 kHz (150 Vp-p)
contains the DC characteristics in the first 5 entries and the second diagram Displacement over Voltage from 0 to 150 V.
The extreme capacity defeats AC at 150V, that's why the AC characteristics are given for 1Vrms. This shows to me dual use, low voltage AC and high voltage DC.
Perhaps you would show me where it states that it is DC.
The first five entries of what, to be exact. Maybe you are looking at a different data sheet to me, which I opened from the link in the first post.You cannot just take some entries in isolation to the rest of the data given.
The data i see shows it having a resonant frequency and an impedance at resonance, neither of which you would need for a DC device.
Even the professional designs are all AC
Sure!
The data sheet makes very clear that the actuator is polarized and designed for 0-150VDC drive. It is intended for precision positioning, with long term application of precise, stable DC voltages.
Notice that the "red wire" denotes the terminal for positive DC bias while the other is grounded. Note also that the actuator is quite powerful and can apply a static force of 4520N at 150 VDC.
As mentioned, these devices have been used in applications like atomic force microscopes, optical microscope stage positioners and other precision devices for at least two decades. The technology is very mature.
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Actually it does not state that it is DC, that is just a supposition on your part, through partially reading the data.
All it shows is that it has a base line at 0V, which in itself does not say it is DC as such. After all a PWM signal could be considered as a rapidly changing DC signal above 0V or an AC signal.
This is the first data sheet I have seen that does not specify specifically that it is DC or AC but it does show test data and specifications that denotes it is an AC type signal doing the driving.
When you look at any specs, you take everything it says into consideration, not just the bit you want it to say.
You do as you want and think as you like, I for one would use a purchased driver rather than drive a Piezo device with a large DC Voltage.
You seem unfamiliar with these parts, and I'm sorry there is some difficulty understanding the data sheet. It is, however, intended for those who already know how to use such actuators.
Good luck in your future endeavors!
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Have you ever actually used a piezo acutator?
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