Preload Structured PiezoElectric Actuators

MechanoTransformer Preloaded Actuators

The preload structured piezoelectric actuator is a piezoelectric actuator where the multilayer stacked piezoelectric actuator is incorporated into a preload frame. The preload frame allows us to create a different output stroke and block force based on our needs by incorporating several multilayer stacked piezoelectric actuators into a preload frame.

List of the MechaTrans®PTK-Series

Features of the MechaTrans®PTK-Series

- Enhancing reliability of the multilayer stacked piezoelectric actuator

The multilayer stacked piezoelectric actuator can be so lasting when is well designed, but can be so fragile when the design work is insufficient. One the reason is the multilayer stacked piezoelectric actuator must be used under a preload conditions due its tension failure is so low which is 1/10 of its blocked (output) force. If a multilayer stacked piezoelectric actuator is well designed with preload, its life cycles can be more than 5 billions cycles.

- Easy to handle

It is quite tricky sometimes to utilize a multilayer stacked piezoelectric actuator. When the design works is not sufficient, then the output stroke become less. You need some know how to fully utilize it. Here, with the preload structured piezoelectric actuator, we guarantee you the performance of the multilayer stacked piezoelectric actuator. Besides, there are tapped hole machined in the preload mechanical structure, you can easily connect it to your experiment setup easily with screws. As the preload structured piezoelectric actuator is only connected to your experiments setup with screws, you can change it easily if there is a necessity. The multilayer stacked piezoelectric actuator will be more robust in your experiments setup when it is case in the preload mechanical structure.

-Reuse of the multilayer stacked piezoelectric actuator

The preload structured piezoelectric actuator can be reuse because it can be easily installed or removed from your experiments setup by removing the screws. Moreover, the multilayer stacked piezoelectric actuator will be more robust in your experiments setup when it is incorporated into a preload frame. Therefore, the chances to reuse the multilayer stacked piezoelectric actuator is high.

-Tailor made your own piezoelectric actuator

The are only several standard sizes of the multilayer stacked piezoelectric actuator in the market. When one need to use a different output performance of the multilayer stacked piezoelectric such as output stroke more that 100?m, one have to order made from the manufacturer. However, it may be highly cost and time consuming to the process. Sometimes the manufacturers do not even supply such long stroke piezoelectric actuator. Therefore, we propose a preload structured piezoelectric actuator that can be tailor based on your needs. We can combine the multilayer piezoelectric actuator in series or in parallel in order to achieve performance you need. Figure of PTK10S90 shows an example of a long strokes preload structured piezoelectric actuator

Long stroke preload structured piezoelectric actuator (PTK10S90)

Dimension: 14 x 19 x 91mm

Output stroke: 100?m (-20V?150V)

Strain gages attached preload piezo actuator (MTPTK)

Figure below show the structure of the strain gages attached preload piezo actuator.

Picture of the strain gages attached preload piezo actuator.

The piezo actuator (piezoelectric stack actuator) is known to have hysteresis, which effect the positioning accuracy. However, with a closed loop control, the linearity of the positioning accuracy can be guaranteed to a certain level depends on the positioning sensor used. Here is an example result of using the strain gages as a positioning sensor to form a closed loop to do a precise positioning with the piezo actuator. The structure of the closed loop system is illustrated below. The PID control method is utilized in the closed loop system.