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FAQ on Use of CoreMorrow Piezo Nano Motion and Control System

Update time：2021-11-25 15:13:39Clicks：1249second


FAQ about Piezoelectric Nano Motion Products


1

Displacement and Blocking Force




Displacement: it is the travel range of piezo actuator under the specified voltage range. This value is measured under no-load conditions, there is no resistance during the displacement of piezo actuator. When one end of the piezo actuator is in a free state, the corresponding elongation is measured after a specified voltage is applied to it.

Max blocking force: it is the max generated force by piezo actuator. This value is the measured output force of piezo actuator under max driving voltage and the displacement is 0, the thrust that resists a large rigid load.

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Suppose that the actuator is fixed between two walls and the max voltage is applied to piezo actuator. Due to the rigidity of the two walls, the piezo actuator cannot be extended and the displacement is zero. At this time, the blocking force is the maximum. But in fact, any object will exhibit a certain modulus of elasticity.

When the stiffness of the external mechanical structure is zero, the max voltage is applied to the piezo actuator, it will produce the max displacement. At this time, the blocking force is zero. The relationship between blocking force and displacement is shown in the figure below.

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2

Installation of piezo stage and load installation




When installing the load, ensure that the load mass is less than the max load, and install the load as much as possible at the center of the moving surface. The correct placement of the load is shown below:

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Load applied to the center of the stage


For protection, we don't recommend the load is too high. If it is used a higher load, please reduce the position center of the load gravity. The error placement method is as follows:

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Try not to let the load center of gravity exceed the stage


It is forbidden to load the load on one side of the piezo stage, which would cause serious damage to the product, as shown in the following figure:

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Do not load longer loads and add to the side of the piezo stage


If the screws used in tightening and connecting are too long, the screws will not be installed or some of screws will leak out, which will scratch the stage and affect the motion accuracy. If the screws are too short, the connection will not be compact and easy to loosen. Looseness could damage the internal structure of the stage. We recommend using the connection method shown below:

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Correct connection


Please do not connect as shown below:

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Incorrect connection


3

Installation Precautions of Piezo Actuator



 
Piezo actuator can't withstand shear, lateral and torsion force. Loading force needs to apply to the center of the moving end of piezo actuator in motion direction. And no clamping force in the periphery of piezo actuator.

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Do not apply a force on a point of piezo actuator. Try to avoid damage to the piezo actuator caused by edge extrusion during installation and use.

 

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4

Other Precautions




1. It cannot be used beyond the given voltage range of the parameter table;
2. Do not scrape off the side coating of the piezo actuator;
3. Piezo actuator without preload cannot withstand tension. It is recommended to load preloaded force, which is one-tenth of the output;
4. The environment where piezo actuator is located should be kept dry;
5. Temperature changes or load changes will cause internal charging of the actuator. Before using, it is recommended to use a few hundred ohm resistors to discharge the actuator;
6. To prevent the surface of piezo actuator from contacting conductive or corrosive substances, the surface can be cleaned with isopropanol, and avoid contact with isopropanol at high temperatures and excessive ultrasonic cleaning;
7. Connect the red lead to the positive terminal of the power supply. The unleaded piezo actuator is the positive electrode near the dot side electrode;
8. Avoid pulling the lead wire forcefully, and do not move the ceramic by pulling;
9. Do not touch the actuator surface directly with your hands, so as not to reduce the stability of the ceramic;
10. If you use glue to fix the actuator, please make sure that the glue between the actuator and the bonding surface is very thin, press lightly to fix it.



FAQ about Piezoelectric Controllers


1

What should I do if I cannot find the device when the piezo controller is connected to the computer via USB?




Solution: CoreMorrow’s latest piezo control system, connect the computer via USB to drive-free as a COM port, search the computer device manager to find the corresponding COM port device, select COM port communication in the open software, and connect the port.

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2

How to switch between digital and analog signal control?




Solution: CoreMorrow's closed-loop control system has two methods of digital and analog signal control. There are two specific methods for switching between the two:

1)CoreMorrow's piezo control system has a setting switch, which can be switched manually;

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2) It can be set and switched through the software operation of CoreMorrow control system.

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3

How to solve the piezo controller software operation reports an error: "overrun"?




Solution: CoreMorrow's piezo control system has a safety protection function. When the software is not operated properly, the system will give a warning to restrict the operation. When such a situation is found, the user should check whether the operation is proper and stop the improper operation as soon as possible (such as setting the voltage value or displacement value exceeds the specified range, excessive power usage, etc.). If there is no improper operation, please check the software system information. Abnormal system information will also cause such problems. Re-read the information and save it to solve it.

4


What is the reason for the overcurrent protection of the piezoelectric controller system?





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Solution: CoreMorrow's piezo controller system has an over-current protection function. When the over-current protection function is turned on, the LIMIT red light of the piezo controller will light up. If this happens, please stop the product operation and conduct an investigation.

1) Check whether the drive output line is intact, bending and breaking can easily cause a short circuit.
2) Check whether the piezoelectric ceramic product is intact, the damage of the piezo actuaotr will cause the short circuit of the piezo controller.


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